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took the truck out today and halfway home it started backfiring when i coast. then it wouldn't idle so i turned up the idle speed screw so it would stay running and it ran.....really rough.

kinda like when my idle stop solinoid in the stock carb went out. so i'll pull the jet and clean it tomorrow even though i rebuilt the damn thing when i got it.

can a timing chain jumping a tooth cause these symptoms?

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I'll be watching this thread real close, cause I have the same symptoms, and still no answers. I'm starting to wonder if it is that carb after all, myself.

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Richard Barnes Salt Lake, Utah
1980 Luv Mikado 4X4
http://geocities.com/luvtruck2004/

Same problem, I put new points and condesor in, along with a remanned disty and did the timing. Ran perfect after that. Took me forever to get that fixed! I took apart the carb several times thinking that was it.

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Shawn
'76 Luv Isuzu
'74 Luv 350

narsisist.....is your valve cover off?

i was wondering if you had checked your valve timing. i haven't started working on my truck yet (just woke up) but i have an idea....i put some slick 50 in my rig yesterday and that's when the troumle started....

i think my chain sliped a tooth....i let you know if that's it .

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No, but I will check it out as soon as I get home from work.

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Richard Barnes Salt Lake, Utah
1980 Luv Mikado 4X4
http://geocities.com/luvtruck2004/

Are you guys running an e.g.r. valve? If so, it could be stuck open. I had this problem with the first V-6 i had. And from what i've seen in the bulletin board, it happens to stock motors too.
As for jumping the cam timing, i dont think thats it. If the cam is off by one tooth, the motor wont run or the cam will snap in 2.

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Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.

Is there a way to check the egr without actually taking it off?

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Richard Barnes Salt Lake, Utah
1980 Luv Mikado 4X4
http://geocities.com/luvtruck2004/

Try smacking it with a wrench. That will usually knock it loose to where it will seat itself again. If the motor is cold, you can slip your finger in to the diaphram housing to see if you can move it.

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Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.

Just a comment on the one tooth off. It will run a tooth either way. I helped a buddy work on a truck that had been put together wrong in more ways than just the valve timing and it had been advanced a tooth. In the process of narrowing it down (before just taking the front cover off and getting it right) he had it back a tooth from correct as well. With the other problems that truck had I can't say much for how an otherwise working truck would run with the chain off a tooth, but it will run. Much more than one tooth and I think you'd start to run into valve/piston interference but I don't know how far you'd have to get.

I was reffering to the early model engine. This is the case with the dual timing chain motor. I assumed that the later motor would do the same.

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Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.

well i guess i got lucky.........that damn adapter has no way to lock the first set of tapered screws .......it was real loose.so i took a few scraps of wire and laid them in the screw holes before i tightened the base down, we'll see if that holds this time.

it seems like anything that could go wrong that day did....i lost the exhaust plug that day too.

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Next time you should plut the plug where you won't forget it!

That's just nutz! I know that I have three vehicles at the house that need parts. My Mazda, My Aerostar, and My LUV. So it is a ASE certification required to do shade tree mechanicals?

I know that I have had it with stupid tapered screws as well

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More LUV than one man could ever need - Spread the LUV!
- 1976 Chevy Longbed - Daily Driver
- 1981 Chevy Shortbed 4X4 - Needs Help!
- 1981 Chevy Luv 4X4 - Newly put together

i wish shade tree could quailfy for ase..........wouldn't be building houses if it did.......

I'd realy dig workin' in a classic car shop though.......

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That makes two of us.

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More LUV than one man could ever need - Spread the LUV!
- 1976 Chevy Longbed - Daily Driver
- 1981 Chevy Shortbed 4X4 - Needs Help!
- 1981 Chevy Luv 4X4 - Newly put together