carburetor or distributer? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

aztecworrior · 10-11-2010, 10:37 PM

i have a question regarding my jimmy.. its been acting funny lately. im really confused with the driving characteristics lately.. used to run fine but i had to replace some parts, (edelbrock carb, and distributer internals.)
it will drive fine, then come in and out of power.. (rpms will go up.. down...up... down...) almost sounds like the truck is misfiring.. the only difference is it will only do it iff i blip the throttle while driving around.. very weird.. let me know if you have any ideas.. i thought because it came in and out of power if might be spark.. but, your the experts!

thanks!

red71cheyenne · 10-11-2010, 10:40 PM

Dizzy internals? Did you replace the module? Or have it out and not replace the heat sink goo? Almost sounds like you are having heat issues with the module.

AlaskaMatt · 10-11-2010, 10:50 PM

I have been fighting weird things like this for over a year. New carb, new coil, cap, rotor, plugs, wires etc. Never seemed to fix the issue. Each of those things were overdue but they didn't fix the intermittent power flux I had. Sometimes it ran pretty well, then without explanation it would be a dog even during the same drive. My buddies thought I was nuts, every time I tried to show them it of course was having one of it's good days (either that or I got the "it's a 350 and a heavy truck of course it's a dog"). Anyway...

I put in a new MSD dizzy on Sunday. It's like a new truck. Seriously i should have just bought a new one a year ago. It's smoother and has more power in my basically stock 350 than I have ever had since owning the rig.

aztecworrior · 10-11-2010, 11:12 PM

so what msd setup did you go with? photos? price?
by the way, big fan of your truck... those pics of it in alaska are just amazing!

red71cheyenne · 10-11-2010, 11:13 PM

Quote:

Originally Posted by AlaskaMatt

I have been fighting weird things like this for over a year. New carb, new coil, cap, rotor, plugs, wires etc. Never seemed to fix the issue. Each of those things were overdue but they didn't fix the intermittent power flux I had. Sometimes it ran pretty well, then without explanation it would be a dog even during the same drive. My buddies thought I was nuts, every time I tried to show them it of course was having one of it's good days (either that or I got the "it's a 350 and a heavy truck of course it's a dog"). Anyway...

I put in a new MSD dizzy on Sunday. It's like a new truck. Seriously i should have just bought a new one a year ago. It's smoother and has more power in my basically stock 350 than I have ever had since owning the rig.

Can't say the same thing here, but I did just put in a new Skip White dizzy and so far its working well. My engine is new, so I'm just getting a feel for how it is.

AlaskaMatt · 10-12-2010, 01:12 AM

Quote:

Originally Posted by aztecworrior

so what msd setup did you go with? photos? price?
by the way, big fan of your truck... those pics of it in alaska are just amazing!

The streetfire, I would have to look up the exact model. It was about 180, but can be had for 150 or so from summit. Summit hammers us on the shipping up here so 180 at the local Napa seemed just fine. I don't have any photos of mine but here is a link to what I bought.

http://www.msdignition.com/Products/...stributor.aspx

Thanks for the comments on the rig!

chuckmc8 · 10-12-2010, 06:53 AM

I had a similar issue with the Edelbrock carb on my 67. It would misfire on oppoiste sides of the engine- I finally traced it back to the carb has a passage to get fuel from one side of the carb to the other and it was stopped up in the middle-it nearly drove me crazy. With my Weiand manifold, one side of the carb does 4 cyls and the other side does the other 4, but i had to look at how the runners on the intake went to which cylinders, and when I did, I realized that the cylinders that were misfiring were all fed by that one side of the carb. It would run fine for about 1/4 mile ( then would use up the gas that had made it through the nearly clogged port in the top of the carb) and then those 4 cyls would run out of fuel. Take the carb top off and remove the needle seats and spray carb cleaner thru the passage from where the fuel comes in and make sure it flows into both fuel bowls.....worked for me! PS, I thought it was a misfire and bought a new HEI dizzy and installed it to eliminate that from troubleshooting. when that didn't solve the prob, I finally found that clogged fuel port. Sorry for the long reply. Hope this helps!

hgs_notes · 10-12-2010, 07:54 AM

Might be the fuel filter. I had a rusty gas tank and it kept clogging the filter. It acted a lot like that.

pound41 · 10-12-2010, 08:21 AM

if they are high mileage check compression I have 2 blazers and both had those issues. Ran good just not great. Change carbs dizzys etc. 7 cylinders great 1 on its way down. put top ends in both motors

10-11-2010, 10:37 PM	#1
aztecworrior Registered User Join Date: Apr 2010 Location: Mission Viejo, Ca Posts: 37	carburetor or distributer? i have a question regarding my jimmy.. its been acting funny lately. im really confused with the driving characteristics lately.. used to run fine but i had to replace some parts, (edelbrock carb, and distributer internals.) it will drive fine, then come in and out of power.. (rpms will go up.. down...up... down...) almost sounds like the truck is misfiring.. the only difference is it will only do it iff i blip the throttle while driving around.. very weird.. let me know if you have any ideas.. i thought because it came in and out of power if might be spark.. but, your the experts! thanks!

10-11-2010, 10:40 PM	#2
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: carburetor or distributer? Dizzy internals? Did you replace the module? Or have it out and not replace the heat sink goo? Almost sounds like you are having heat issues with the module. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

10-11-2010, 10:50 PM	#3
AlaskaMatt Registered User Join Date: Apr 2010 Location: AK Posts: 198	Re: carburetor or distributer? I have been fighting weird things like this for over a year. New carb, new coil, cap, rotor, plugs, wires etc. Never seemed to fix the issue. Each of those things were overdue but they didn't fix the intermittent power flux I had. Sometimes it ran pretty well, then without explanation it would be a dog even during the same drive. My buddies thought I was nuts, every time I tried to show them it of course was having one of it's good days (either that or I got the "it's a 350 and a heavy truck of course it's a dog"). Anyway... I put in a new MSD dizzy on Sunday. It's like a new truck. Seriously i should have just bought a new one a year ago. It's smoother and has more power in my basically stock 350 than I have ever had since owning the rig. __________________ Thanks, Matt My Website Last edited by AlaskaMatt; 10-11-2010 at 10:54 PM.

10-11-2010, 11:12 PM	#4
aztecworrior Registered User Join Date: Apr 2010 Location: Mission Viejo, Ca Posts: 37	Re: carburetor or distributer? so what msd setup did you go with? photos? price? by the way, big fan of your truck... those pics of it in alaska are just amazing!

10-12-2010, 06:53 AM	#7
chuckmc8 It's alsways something..... Join Date: Nov 2008 Location: Douglasville GA Posts: 1,171	Re: carburetor or distributer? I had a similar issue with the Edelbrock carb on my 67. It would misfire on oppoiste sides of the engine- I finally traced it back to the carb has a passage to get fuel from one side of the carb to the other and it was stopped up in the middle-it nearly drove me crazy. With my Weiand manifold, one side of the carb does 4 cyls and the other side does the other 4, but i had to look at how the runners on the intake went to which cylinders, and when I did, I realized that the cylinders that were misfiring were all fed by that one side of the carb. It would run fine for about 1/4 mile ( then would use up the gas that had made it through the nearly clogged port in the top of the carb) and then those 4 cyls would run out of fuel. Take the carb top off and remove the needle seats and spray carb cleaner thru the passage from where the fuel comes in and make sure it flows into both fuel bowls.....worked for me! PS, I thought it was a misfire and bought a new HEI dizzy and installed it to eliminate that from troubleshooting. when that didn't solve the prob, I finally found that clogged fuel port. Sorry for the long reply. Hope this helps! __________________ 1968 RS Camaro 'Vert Matching number 327 and M21 Muncie 1968 C10 Black with red interior and orig paint. 5.3 / 4l60e,3:73 POSI 17" Torq Thrusts 1968 CST 514 Red with black interior. Buddy Buckets, Factory A/C, PS, PB- 20" AR custom shop TT, 5.3 and 4l60e

10-12-2010, 07:54 AM	#8
hgs_notes GEARHEAD Join Date: Aug 2003 Location: MN Posts: 6,126	Re: carburetor or distributer? Might be the fuel filter. I had a rusty gas tank and it kept clogging the filter. It acted a lot like that. __________________ If no one knows what you're doing, they can't tell you you're doing it wrong HG's Dream Car Build - Shelby Cobra Kit Build your own adjustable track bar 71 Long Fleet C/10 72 Jimmy 4x4 (Junkyard Jimmy) HG's Plow Truck '78 K35 Dually Bigass Farm Truck HG's thread of miscellaneous stuff

10-12-2010, 08:21 AM	#9
pound41 Registered User Join Date: Dec 2002 Location: Northern Virginia Posts: 1,268	Re: carburetor or distributer? if they are high mileage check compression I have 2 blazers and both had those issues. Ran good just not great. Change carbs dizzys etc. 7 cylinders great 1 on its way down. put top ends in both motors



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