inconsistent running engine
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Junior User
Joined: Mar 2004
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inconsistent running engine
I know I have another post going but figured I would get more help If I posted the issue in title.
So I just got the timing chain chained on a truck I had never heard run. Some times it runs good, revs up and has power. Most of the time it stumbles, on start up, with partial throttle, and full throttle. It sounds like a heavy miss. If it is doing it at idle I have to feather the gas to make it not die. When idleing it goes at 1500 rpms. I have tried everything to get it down and can get it to 1000 min. Idle mix screws do nothing all the way or out. The carb is edle 600 ele choke. I am getting frustrated. Please help. I am thinking there is more than just 1 problem.
So I just got the timing chain chained on a truck I had never heard run. Some times it runs good, revs up and has power. Most of the time it stumbles, on start up, with partial throttle, and full throttle. It sounds like a heavy miss. If it is doing it at idle I have to feather the gas to make it not die. When idleing it goes at 1500 rpms. I have tried everything to get it down and can get it to 1000 min. Idle mix screws do nothing all the way or out. The carb is edle 600 ele choke. I am getting frustrated. Please help. I am thinking there is more than just 1 problem.
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
How's the distributor? The advance might be sticking? What's the timing set at?
My first advise was to throw that carb away, but I'll give that it might be something else first. I just don't care for those style of carbs.
My first advise was to throw that carb away, but I'll give that it might be something else first. I just don't care for those style of carbs.
Logistics Pro
Joined: Oct 2005
Posts: 3,785
Likes: 4
From: Mddl A MexCans
Vac leak is what will be my guess. ='s possibly why the rpms wont drop, and mixtures have little effect. Would also make for a **** poor idle and funky running features. Two tools I'd have handy for sure are a timing light and vacuum gauge. These should help you determine where the issue is. If it's still a points style dizy a dwell meter would be a big help as well.
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Junior User
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I just went out there and fired it up idle was at 1800ish. I tried to calm the idle down. I was manipulating the choke plate and got it down to 1000. Sprayed carb cleaner on every vac line and around the base of the carb and down on the transmission vac lines. It had no effect. I sprayed the vac advance on dizzy. Nothing. I loosened up the dizzy and moved it ccw and idle went down, sounded perfect. 1 min later motor shut off. I tried to restart and no fire. Kept at it and then it fired but sounded like on 4 cyls. I reved it up and engine overcame and ran on all 8. Does this point more to fuel or timing or borh?
Posting Guru
Joined: Aug 2005
Posts: 1,069
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I wouldn't rule out elect problem. I've had 2 problems in the past that seemed like vac/carb trbles(I'm not a mech, but play one on driveway), one was a bad coil and other time a bad coil wire. Use a timing lite on a sparkplug wire and see if your getting spark all the time. Check your connections. on primary side of ignition. You got duraspark? Maybe it going bad.
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Junior User
Joined: Mar 2004
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Thecoil is new msd blaster 2. I was thinking that too cause I got the smallest shock when adjusting timing via dizzy and also another when I was trying the idle screw
the ignition box is a "BRAVO" says that on it in blue letters and a line under it!
the ignition box is a "BRAVO" says that on it in blue letters and a line under it!
Last edited by 76F150390ci4x4; Feb 11, 2008 at 03:24 PM.
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Fleet Mechanic
Joined: Aug 2007
Posts: 1,806
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From: Piney Woods of East Texas
Look inside the distributer cap and see if there is a bunch of corrosion on the terminals. Also look for moisture in the cap. Happens to mine since it sets long periods. Also see when you twist the rotor if it will spring back. If not the mechanical adv is stuck.
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Junior User
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rotor and cap looks good. When the rotor si twisted it goes back. On the way home from work it ran like a raped ape. I am thinking it is an issue with the carb. A buddy of mine is gonna let me borrow his newly rebuilt edle 650 to see if that fixes my issues. I am out of money till friday but I am gonna buy new spark plugs and wires cause the ones on there are old and rough looking. The spark plugs are black and sooty and look 20 years old.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Sounds to me like you have the initial timing screwed up too high to start with and then something is sticking in the advance or with the carb linkage or you have a vacuum leak somewhere you haven't checked or can't check (like under the intake).