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10-20-2003, 07:35 PM
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#1 |
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Professional Grade
Join Date: May 2003
Location: Fort McMurray, Alberta
Posts: 7,915
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Sigh, I give up
I can't get this freaking engine to work!! She still backfires through the carb for NO reason at all.
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1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap) |
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10-20-2003, 07:53 PM
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#2 |
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Registered User
Join Date: Jan 2003
Location: Washington State
Posts: 8,834
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What have your tried up to this point?
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1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo |
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10-20-2003, 07:55 PM
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#3 |
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Robert Olson Transport
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,281
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backfire through carb huh? youve checked the lifters youve checked the timing i assume and if i remember correct youve messed with the carbuerator. I trust this is a electronic ignition so there prolly is no condensor in it and if there was it would fire out the back end..check to make sure all the ignition wires are ok and not being screwed up by touching an exhaust manifold and no wiring is getting burned or shorted check your cap and rotor ( a rotor did this to me once it was shooting spark up through its top) check your carb is getting decent gas check the valve clearancs and guides and finally check youve not got plug wires crossed
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Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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10-20-2003, 07:58 PM
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#4 |
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Professional Grade
Join Date: May 2003
Location: Fort McMurray, Alberta
Posts: 7,915
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I don't think the wiring is crossed... I've done this like 10 times now... The lifters are excellent, the timing is close enough to keep the engine from backfiring through the carb, the cables look excellent, the distro and coil are good, and there is plenty of gas in the carb.... Not sure about valve clearances, and I dunno what guides are.
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1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap) |
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10-20-2003, 09:32 PM
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#5 |
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Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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Start back at the starting line. Pull #1 sparkplug, bump it over until you get #1 on compression stroke, follow the #1 spark plug wire to the cap, mark the cap tower, pull the cap, see where the rotor is pointing. Should be pointing toward the tower on the cap where #1 is. If not its not set in there right. If that is okay I would move onto testing the coil and module.
What is the timing set at? How did you adjust your lifters? Where is number one on the cap? |
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10-20-2003, 09:35 PM
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#6 |
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Professional Grade
Join Date: May 2003
Location: Fort McMurray, Alberta
Posts: 7,915
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Dunno what the timing is on it, haven't got it to idle yet. The lifters were not adjusted. I'm gonna do another compression test on it to test my stuck valve theory, If I don't find any problems I'll completely rebuild the entire ignition system with brand new cables as well
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1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap) |
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10-20-2003, 10:00 PM
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#7 |
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Registered User
Join Date: Jan 2002
Location: Houston, TX
Posts: 2,144
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will it run for any length of time? like more than a few seconds............. i bet your distirbutor is either 180 out or very retarded
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'51 F100, backhalf with a narrowed 9 and coil overs, 18.5" mickeys, monte front clip, +400" sbc in the works '05 1500 Crew Cab RIP '84 swb 5/7 drop, solid cammed 408 w/ fully ported dart heads, th350 w/ 10 inch hughes, 12 bolt w/ 3.73 richmonds and a locker '80 swb 4x4 in progress: 7" lift, 350 th350/np205, d44 and 1.5" ORD tie rod, 14BFF w/discs , armored diff covers, 40" MTR's |
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10-20-2003, 10:03 PM
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#8 |
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Professional Grade
Join Date: May 2003
Location: Fort McMurray, Alberta
Posts: 7,915
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I swapped distributers, I'm gonna rebuild the ignition system tommorow incase that is infact the case that I was not on TDC.
It was doing this before I pulled it all apart, so I'm guessing it isn't entirely ignition... If I can get it going a little better than I can adjust my valves to make sure they are in the right position... Then once it is warm I will do my timing... Thats all dependant on me getting it to run on its own...
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1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap) |
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10-20-2003, 10:32 PM
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#9 |
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Insert Witty Text Here
Join Date: Oct 2002
Location: San Antonio, TX
Posts: 3,415
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Did you adjust the valves like it says on swervin's site? You can do it without starting the engine.
Slonaker |
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10-20-2003, 10:48 PM
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#10 |
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Right turn Clyde
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
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I hope if you did put new lifter in you set the valve lash and preload before you try and start it. You can have all kinda bad things happen if its not set.
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10-20-2003, 11:40 PM
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#11 |
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Professional Grade
Join Date: May 2003
Location: Fort McMurray, Alberta
Posts: 7,915
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I didn't put in any new lifters, the old ones were in excellent shape.
Slonaker, I'm gonna do that again tommorow just to make 100% sure that those things are set properly, and also make sure that I am TDC with my tissue, and looking at the valves... I've changed my mind, I am gonna get this beast running, and I am gonna get it running by Thursday night at the very latest.
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1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap) |
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10-21-2003, 01:44 AM
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#12 |
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LED King
Join Date: Jan 2003
Location: Sacramento, CA
Posts: 2,088
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Carefull with that. Guy I know blew the carb right off his intake doing that.
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Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32 |
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10-21-2003, 02:43 AM
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#13 |
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Account Suspended
Join Date: Oct 2002
Location: Elkhart, IN
Posts: 6,400
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get a timing light, i would be that your timing is off.
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10-21-2003, 02:43 AM
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#14 |
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Account Suspended
Join Date: Oct 2002
Location: Elkhart, IN
Posts: 6,400
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oh, and contrary to what Low84 said, if its backfiring out the carb, your timing would be advanced, not retarded. retarded timing would cause it to backfire out the exhaust.
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10-21-2003, 08:13 AM
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#15 |
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Registered User
Join Date: Jan 2003
Location: Washington State
Posts: 8,834
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Seen strange things happen with the distributor 180 degrees off.....
__________________
1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo |
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10-21-2003, 11:33 AM
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#16 |
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Senior Member
Join Date: Jan 2003
Location: Atlantic City, NJ
Posts: 1,073
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I just went through the same thing with my NEW Big block. She would idle but as soon as I put a load on her she popped. My cure was that #6 #8 valves were tightened down to much leaving the valves open...nice huh? I could of swore it was ignition but my friend the hotrod guru saved my ass
 Set the rockers cold like on Swerves site.
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86 SWB 9.0 LITER T-400-OD 4.11 eaton-4/5 drop Best 1/4 12.51 @112mph no traction 
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