[ElCAMIN0]

My 85 elcamino with a 4.3 fuel injection has been running really rough at idle and hesitating slightly whenever at operating temperature. Any ideas?

 

[andiamo]

Have you changed the fuel filter recently? Or had the injectors cleaned? At that age this is just a question (as I'm not used to that old of a throttle body) could the throttle shaft be worn out and sucking air in because of it? I know if you have that happen with a carb from age you'll get both of those symptoms.

 

[ElCAMIN0]

All the components you named were replaced. Could a catalytic converter creating to much backpressure cause those same problems? Because its only when its at operating temp

 

[BOOSTED-SS-ELKY]

Have you changed the fuel filter recently? Or had the injectors cleaned? At that age this is just a question (as I'm not used to that old of a throttle body) could the throttle shaft be worn out and sucking air in because of it? I know if you have that happen with a carb from age you'll get both of those symptoms.

X2

I dont think your exhaust system is causing your problem. This issue is most likely related to fuel delivery. A hesistation or miss at acceleration is caused by a lack of fuel, too lean, most of the time.

 

[Rob johnson]

let me know what the problem is , i have the same car, engine problem ,help

 

[Rob johnson]

I have used every kind of injector cleaner there is but did not replace the fuel filter

 

[woody31]

Check your voltage at the throttle position sensor could be needed a slight adjustment