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Username Post: 1986 4.3 throttle body questions        (Topic#356276)
drummertom 
Member
Posts: 1932
drummertom
Age: 66
Loc: Durham NC
Reg: 09-03-06
05-03-19 02:51 AM - Post#2765603    

I'm getting fire to all the plugs, at least the plug wires. have changed plugs, fuel filter and had the module in the dist tested and it tested good. Can't find a vacuum leak. From a stop, if you accelerate hard, it will stumble and stall out. if you accelerate slowly, it goes with little problems. There is pretty much always a raw gas smell. Does this have a fuel pressure regulator? Could it be timing? Any thoughts or suggestions? TIA!!

www.picturetrail.com/drummertom

"Well my time went so quickly. I went lickety spickley out to my ol' 55"


 




Shepherd 
Frequent Contributor
Posts: 1889

Loc: Lake George, NY
Reg: 11-11-15
05-04-19 04:31 AM - Post#2765689    
    In response to drummertom

Confirm good fuel pressure and a clean fuel filter.



 
drummertom 
Member
Posts: 1932
drummertom
Age: 66
Loc: Durham NC
Reg: 09-03-06
05-05-19 02:57 AM - Post#2765745    
    In response to Shepherd

Yup, did that already. I was going to look at my spray from the injectors, and for some reason, just unplugged the TPS, and it started running better. I left it unplugged, and it ran like a top. I plugged it back up and I started running lousy. The only downside to leaving it unplugged was the CEL comes on. The owner said the CEL came on and went off on its own all the time anyway, and he didn't want to spend the money on a new TPS so that's the way we left it. Don't understand why it would run better with it unplugged, but it does.

www.picturetrail.com/drummertom

"Well my time went so quickly. I went lickety spickley out to my ol' 55"


 
1983G20Van 
Super Senior Member
Posts: 3794

Loc: Bedford, Texas, USA
Reg: 11-13-02
05-09-19 06:06 AM - Post#2766016    
    In response to drummertom

  • drummertom Said:
Yup, did that already. I was going to look at my spray from the injectors, and for some reason, just unplugged the TPS, and it started running better. I left it unplugged, and it ran like a top. I plugged it back up and I started running lousy. The only downside to leaving it unplugged was the CEL comes on. The owner said the CEL came on and went off on its own all the time anyway, and he didn't want to spend the money on a new TPS so that's the way we left it. Don't understand why it would run better with it unplugged, but it does.



Unplugging the TPS causes the ECM to go into a form of limp mode where it throws out the information from the dead sensor and runs on the other sensors. Follow the GM diagnostic testing procedure for the TPS sensor. I am guessing it fails that test. Correct the problem and I am sure the car will run better. It may have other issues, but you have to correct the obvious one first and see where that gets you.

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 




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