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#26 | |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Quote:
If it wants to die going into gear at 700 then you need more initial. I mentioned lifter preload because it’s possible all your problems are related to a valve or two not seating fully. Just another thing to look at. If you rerun the valves just ask here for guidance here first. And leave the carb alone until you’ve optimized your timing. After all the motto is ‘Timing first, carb second’. And your run on isn’t only timing related. It’s also caused by too much air which you’re feeding it with your primary throttle position. And the other one is ‘99% of carb problems are actually timing problems’. Last edited by geezer#99; 10-29-2018 at 12:46 PM. |
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#27 | |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Quote:
The idle does drop approx. 250-300 RPM going into gear so we'll see if I can set the idle low and readjust the timing to see what happens. I'll check the floats first just to verify they're set properly while I'm doing the timing and leave it alone beyond that. A quick question, will the timing being off / too far advanced / not optimized clear up at higher RPMs because the advance and vacuum at those engine speeds or is it something else? Again, that's what has always baffled me, the certain specific times when this occurs. Thanks again!
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1969 C10 Stepside (PERCY - tribute to CDE) 1996 Chevrolet Tahoe 2-door / 2WD LS5.3/4A (ROBYN) 1998 GMC SLE Regular Cab Short Bed Fleetside 4.3/4A (LUCY) (driver) 2000 JEEP Cherokee Sport XJ 4x4 4.0/4A (RUBY, son #2) 2013 VW GTI Driver's Edition 1.8T/6A (GRAU GEIST, son #1) 2016 BMW X5 xDrive50i MSport 4.4L N63/8A (SCHNEEWITTCHEN) |
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#28 |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Timing can do that.
Too much fuel pressure can do that. A valve hung open can do that. Lots of possibilities. You gotta start over. Rerun your valves. Optimize your timing. Verify your fuel pressure at all rpm’s. Adjust your carb. See what it does then. If your timing light is wacky like you mentioned just replace #1 wire with a normal stock type wire. |
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#29 |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Hi Keith, Do a compression check and see if that tells you some thing! I had a broken valve spring on one cylinder and chased the ignition and fuel systems and did not find the problem until a compression test and a visual on the valve springs. At least you will know if you have a tight engine!
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#30 | |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Quote:
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1969 C10 Stepside (PERCY - tribute to CDE) 1996 Chevrolet Tahoe 2-door / 2WD LS5.3/4A (ROBYN) 1998 GMC SLE Regular Cab Short Bed Fleetside 4.3/4A (LUCY) (driver) 2000 JEEP Cherokee Sport XJ 4x4 4.0/4A (RUBY, son #2) 2013 VW GTI Driver's Edition 1.8T/6A (GRAU GEIST, son #1) 2016 BMW X5 xDrive50i MSport 4.4L N63/8A (SCHNEEWITTCHEN) |
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#31 | |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Quote:
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1969 C10 Stepside (PERCY - tribute to CDE) 1996 Chevrolet Tahoe 2-door / 2WD LS5.3/4A (ROBYN) 1998 GMC SLE Regular Cab Short Bed Fleetside 4.3/4A (LUCY) (driver) 2000 JEEP Cherokee Sport XJ 4x4 4.0/4A (RUBY, son #2) 2013 VW GTI Driver's Edition 1.8T/6A (GRAU GEIST, son #1) 2016 BMW X5 xDrive50i MSport 4.4L N63/8A (SCHNEEWITTCHEN) |
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#32 |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Check for uniform rocker movement.
I’ve used tall pieces of cardboard as oil deflectors when running the valves. When you set them just start with #1 and back off each nut until they click and then tighten just enough to be quiet. Do all that way. Then shut the motor off and adjust all to 1/2 turn. Sometimes if you’re adjusting the preload too quick you can cause the motor to stumble and die. Half a turn gets you close depending on whose lifters are in it. Factory setting is likely 1 turn but not all lifters are created the same. Some design differences from cam company to cam company. Then do a compression check. |
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#33 |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Your HEI specs sound fine, just have to verify it’s working properly. After your rewiring job, it should be getting the full 12 volts, so just verify that to be sure. Is the vacuum advance adjustable? Normal HEI spark plug gap is .045, but if DUI suggests .050 for their unit, keep it there.
Since you’re a little confused on timing, here’s the skinny. Initial timing is just the engine by itself without any mechanical or vacuum advance added in. Rotating the distributor adjusts it and gets the engine in the ballpark to ensure its working well. Basically a coarse adjustment. Total timing is the engine’s initial timing, plus however many degrees of mechanical advance the distributor has. This fine tunes the initial and mechanical advances together. To adjust it, the engine is rev’d to high rpm (3-4K + rpm, depending on the spring strength) until it stops advancing, which is when full mechanical advance is reached. Personally I just take the springs out (don’t lose them!) and rev it between 1500-2000 rpm to set it because, #1, I’m not too fond of the engine screaming at 4K rpm while my head is under the hood, and #2, full mechanical advance is achieved at a much lower rpm without the springs holding it back. Using your engine and 36 degrees total timing an example….24 degrees mechanical advance, plus 12 degrees initial timing, equals 36 degrees total timing. 24+12=36. That’s your total timing. Then there’s the vacuum advance. The vac advance is used to add an extra amount of timing to increase the engine’s efficiency during low load situations; idle and cruise. Rich mixtures burn quickly, lean mixtures do not. Idle and cruise are lean operating conditions and need the extra timing from the vac advance to burn the lean mixture efficiently. So to achieve this, your vac advance must be plugged in to manifold vacuum. Timed, or ported vacuum, is used for emissions equipment your engine may be required to run, such as EGR valves, smog stuff, etc. Our trucks aren’t encumbered with that, so we can use the vac advance to its full advantage. Adding too much timing will cause detonation, so 10-15 degrees vac advance is plenty. Once hooked up to manifold vac, the extra timing will increase the idle, so you can lower it back down to 750 rpm and you should be able to adjust your idle mixture screws as outlined in the manual. Here’s a timing article written by a GM engineer…more than you want to know I bet, ha, but invaluable info: http://www.camaros.org/pdf/timing101.pdf Valve adjustment is a great idea as well. Use Comp Cams’ EOIC method for adjusting them dead on.
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#34 |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Just changed the gap in my spark plugs, old ac plugs I was told .045-.050.....went back to .035...runs alot better...Just my 2 cents I know nothing about high voltage coil...etc.
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#35 |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
As I mentioned I suspected the distributor and or module is not working correctly...
Your mentioning dropping the plug gap down to .035 and it runs better, confirms a lack of high voltage for the spark system... To check the system, drop in a standard HEI distributor setup and retry your test drive...dont be surprised if it fixes the off idle stumble and misfire... ![]() ![]() ![]() ![]() ![]()
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#36 | |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Quote:
Same story with the plugs, originally gapped at 0.035 and A86's then went to AP86's gapped at 0.050. Same result. I tried Performance Distributors on the phone all day today and got a busy signal so I sent a message. They do offer to have customers send in the units for testing and repair and if they don't find anything, they charge a $25 service fee so that's a viable option if I can't rule ignition out.
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1969 C10 Stepside (PERCY - tribute to CDE) 1996 Chevrolet Tahoe 2-door / 2WD LS5.3/4A (ROBYN) 1998 GMC SLE Regular Cab Short Bed Fleetside 4.3/4A (LUCY) (driver) 2000 JEEP Cherokee Sport XJ 4x4 4.0/4A (RUBY, son #2) 2013 VW GTI Driver's Edition 1.8T/6A (GRAU GEIST, son #1) 2016 BMW X5 xDrive50i MSport 4.4L N63/8A (SCHNEEWITTCHEN) |
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#37 |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Thx for the update...
This may sound silly,,, but there is a good ground strap in place between the engine block and the cab of the truck? I have witnessed a simple missing ground strap drive guys insane for weeks.... ![]() ![]() ![]()
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#38 | |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Quote:
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1969 C10 Stepside (PERCY - tribute to CDE) 1996 Chevrolet Tahoe 2-door / 2WD LS5.3/4A (ROBYN) 1998 GMC SLE Regular Cab Short Bed Fleetside 4.3/4A (LUCY) (driver) 2000 JEEP Cherokee Sport XJ 4x4 4.0/4A (RUBY, son #2) 2013 VW GTI Driver's Edition 1.8T/6A (GRAU GEIST, son #1) 2016 BMW X5 xDrive50i MSport 4.4L N63/8A (SCHNEEWITTCHEN) |
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#39 | |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Quote:
Yessir, I have ground straps at the frame to the block on both sides, the heads to the firewall on both sides, frame to cab in (4) places and same with the bed to frame. I'm confident the wiring and the grounds are good.
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1969 C10 Stepside (PERCY - tribute to CDE) 1996 Chevrolet Tahoe 2-door / 2WD LS5.3/4A (ROBYN) 1998 GMC SLE Regular Cab Short Bed Fleetside 4.3/4A (LUCY) (driver) 2000 JEEP Cherokee Sport XJ 4x4 4.0/4A (RUBY, son #2) 2013 VW GTI Driver's Edition 1.8T/6A (GRAU GEIST, son #1) 2016 BMW X5 xDrive50i MSport 4.4L N63/8A (SCHNEEWITTCHEN) |
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#40 |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Quick update (sure, as you all can tell, I'm not quick)...
I lowered the idle to 650 RPM or so, set initial to 12° (it was confirmed only the 4° off from my initial 16° setting so timing was accurate anyway) and 36° at 3000-3200 RPM. I ran the engine at various RPM in the garage while working on this and getting to operating temps. This was likely 25-30 minutes as I was doing a few other things, looking at vacuum (dropped about 8-10" due to idle speed) and then adjusting the idle mixture screws after timing. I also tested the accelerator pump with the engine off and its squirting plenty on the front barrels of the carb. I was checking plug wires in the dark, underneath the truck, etc. and no arcs were noticed. It could be my head but it did seem the misfire at idle changed when moving some of them although I couldn't see any arcing. I left the vacuum advance unplugged for the test drive as I wanted to see how it drove based on the total timing alone. I also left the air cleaner off. Oddly enough, here's where it gets funny, I backed out of the driveway, then put it in drive and went down the street for a few stop and go take offs. It did absolutely wonderful with mid-full throttle off the line starts as well as minimal throttle off the line. Ran like a champ, smooth and misfire free....for about a mile. As soon as I took a curve, it began to act up bogging and hesitating. It did this a few times but for the most part was running better. To me it seemed like curves or turns were worse than straight take offs. Not sure if this means anything. About 5 minutes later and a few more turns, it was bogging and hesitating like it's been doing. Coming home after a 15 minute drive in traffic, it would hesitate intermittently at off idle speeds. As noted previously, it always ran fine when the kick down was activated. Some turns and take offs whether light or mid throttle were OK, others were not. Full throttle did nothing more than light throttle. Not sure if any of this means more or not, just thought I'd report it. Still going to look at the valve adjustment, the float settings and the jets. I found the .101 jets in my kit so no need to buy one just to test the richer settings. After thinking about it more while driving and listening to feedback, its seeming more and more like a lean setting and starving for fuel unless in the mid to upper power band. I'm not ruling anything out yet however. Thanks again for everyone's input. I'll keep trying.
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1969 C10 Stepside (PERCY - tribute to CDE) 1996 Chevrolet Tahoe 2-door / 2WD LS5.3/4A (ROBYN) 1998 GMC SLE Regular Cab Short Bed Fleetside 4.3/4A (LUCY) (driver) 2000 JEEP Cherokee Sport XJ 4x4 4.0/4A (RUBY, son #2) 2013 VW GTI Driver's Edition 1.8T/6A (GRAU GEIST, son #1) 2016 BMW X5 xDrive50i MSport 4.4L N63/8A (SCHNEEWITTCHEN) |
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#41 |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
PM to you on the way
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#42 |
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Location: Austin, TX, USA
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Something is drastically wrong with your carb if you can bottom out or remove the idle mixture screws with ZERO net change.
If you have not bought a book on tuning an AFB/Edelbrock carb, I'd be looking at Amazon. Something is really wrong with yours. I have a 750 cfm Edelbrock on my boat and a 600 Carter on my CJ5 and they don't behave that way at all.
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#43 |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Sounds like a float problem.
When you check the float level also check the float drop. It has to be set right too. |
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#44 |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Quote: “I lowered the idle to 650 RPM or so, set initial to 12° (it was confirmed only the 4° off from my initial 16° setting so timing was accurate anyway) and 36° at 3000-3200 RPM.
I ran the engine at various RPM in the garage while working on this and getting to operating temps. This was likely 25-30 minutes as I was doing a few other things, looking at vacuum (dropped about 8-10" due to idle speed)” Quote Your initial post said you had about 20” of vacuum at idle. Does this mean you now only have 10” vacuum at idle? That is way low. Barring a vacuum leak somewhere, such low vacuum indicates possible valve issues as discussed in other posts
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#45 |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
A couple of items that may help. It sounds like backing the timing off helped. Have you verified that your timing marks for TDC are correct?
Misfires while turning does suggest a float level problem. When you check the float level make sure that the floats are not fuel soaked or if brass that they have no fuel inside of them. Also check that they move freely when holding the air horn level and at angles to mimic the forces felt when turning. Your plug wires could have high internal resistance that may be changing as you move the wires. Here is what I use to test plug wires and spark power. https://www.amazon.com/Lisle-20700-C.../dp/B00IXMA1RY Have you tried wiring the choke open to take it out of the equation? It is quite possible that you have more than one problem contributing to your symptoms. Here's a link to a valve adjustment procedure. https://www.crankshaftcoalition.com/...raulic_lifters
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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#46 | |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Quote:
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1969 C10 Stepside (PERCY - tribute to CDE) 1996 Chevrolet Tahoe 2-door / 2WD LS5.3/4A (ROBYN) 1998 GMC SLE Regular Cab Short Bed Fleetside 4.3/4A (LUCY) (driver) 2000 JEEP Cherokee Sport XJ 4x4 4.0/4A (RUBY, son #2) 2013 VW GTI Driver's Edition 1.8T/6A (GRAU GEIST, son #1) 2016 BMW X5 xDrive50i MSport 4.4L N63/8A (SCHNEEWITTCHEN) |
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#47 |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Thanks again geezer, I will be checking the float and float drop this week.
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1969 C10 Stepside (PERCY - tribute to CDE) 1996 Chevrolet Tahoe 2-door / 2WD LS5.3/4A (ROBYN) 1998 GMC SLE Regular Cab Short Bed Fleetside 4.3/4A (LUCY) (driver) 2000 JEEP Cherokee Sport XJ 4x4 4.0/4A (RUBY, son #2) 2013 VW GTI Driver's Edition 1.8T/6A (GRAU GEIST, son #1) 2016 BMW X5 xDrive50i MSport 4.4L N63/8A (SCHNEEWITTCHEN) |
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#48 | |
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Join Date: Feb 2017
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Quote:
HO455, thanks for the updated response. Yes, I've verified TDC and the marks several times. My new mark is about 4° behind that of the original mark on the balancer. Noted on the floats, I appreciate this information, I will check this as well. Regarding the choke, I have not wired it open but have run several settings. I may give this a try as well but the choke seems to function properly and visibly open when it's supposed to be. Another note, the same situation was apparent with the old Carter AFB as well, it had the same or similar problems with the old carb and intake set-up. Thanks for the link on valve adjustment, I'll plan to tackle this on the upcoming weekend and visually inspect the springs as well.
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1969 C10 Stepside (PERCY - tribute to CDE) 1996 Chevrolet Tahoe 2-door / 2WD LS5.3/4A (ROBYN) 1998 GMC SLE Regular Cab Short Bed Fleetside 4.3/4A (LUCY) (driver) 2000 JEEP Cherokee Sport XJ 4x4 4.0/4A (RUBY, son #2) 2013 VW GTI Driver's Edition 1.8T/6A (GRAU GEIST, son #1) 2016 BMW X5 xDrive50i MSport 4.4L N63/8A (SCHNEEWITTCHEN) |
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#49 |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Run your valves again to verify you dont have one or more hanging open. Use the EOIC method, never mind cutting a valve cover. Secondly, maybe I missed it but what cam & lifters are you running? Thirdly, find a proven functional carb off another small block with comparable cam and heads just to verify a carb problem. Surely a friend or board member, perhaps a local speed shop or drag racer has a carb laying around to loan for a couple of test hits?...Lastly, read up on mods to the accelerator pumps on those AFB carbs. With those heads and a comparable semi race cam a stock 600 cfm AFB squirter aint going to cut it. I'm thinking either more volume of the squirt, and/or a longer duration of the squirt will make your 327 snap to attention...I'd loan you a proven Cliff Ruggles Quadrajet if you were closer and running a spread bore intake...Good luck, your well on your way to becoming an expert AFB guy!
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#50 | |
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Re: '69 C10 327 SBC Off Idle Stumble / Misfire Help - I feel like I've tried EVERYTHI
Quote:
Regarding the cam, it's mild at best, no lope or choppy idle but I cannot be certain what the specs are on the cam and lifters. I'd say its similar to what may have been in this 327 stock and I doubt it was one of the HP 'Vette units. My knowledge is that it was from a '65 Nova but even this could have been 275HP+. Noting again that I had the previous Carter AFB 600 CFM with similar issues, this makes me believe it's not the carb since my dad was a carb guru and rebuilt AFB, Holley and Q-Jet's for a hobby. I'll definitely take a look at a borrowed carb if the float adjustment doesn't do the trick as well as accelerator pump alternates. Thanks again for the comments and encouragement!
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1969 C10 Stepside (PERCY - tribute to CDE) 1996 Chevrolet Tahoe 2-door / 2WD LS5.3/4A (ROBYN) 1998 GMC SLE Regular Cab Short Bed Fleetside 4.3/4A (LUCY) (driver) 2000 JEEP Cherokee Sport XJ 4x4 4.0/4A (RUBY, son #2) 2013 VW GTI Driver's Edition 1.8T/6A (GRAU GEIST, son #1) 2016 BMW X5 xDrive50i MSport 4.4L N63/8A (SCHNEEWITTCHEN) |
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