ENGINE RUNS ROUGH ONLY WILL STAY RUNNING IF YOU FLUTTER THE THROTTLE

1990 Chevrolet S-10

Tiny

aaronmesker

September, 10, 2012 AT 1:44 AM

But runs fine if you spray starting fluid in the throttle body. I have replaced both the injectors, and replaced the dist. Cap and rotor, use a noid light to see if injector pulse is present and there is a pulse and it has good fuel pressure have also replaced the fuel pump relay

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6 Answers

Tiny

ASEMaster6371

September, 10, 2012 AT 1:46 AM

What is the actual fuel pressure?

Do you have any vacuum leaks? Especially around the throttle body.

Roy

Tiny

aaronmesker

September, 10, 2012 AT 1:50 AM

I dont believe it has any vacuum leaks fuel pressure is about 12psi

Tiny

aaronmesker

September, 10, 2012 AT 1:54 AM

Did I mention it also back fires shoots a good flame too

Tiny

ASEMaster6371

September, 10, 2012 AT 2:15 AM

Verify that the wires are going to the correct plug. Otherwise it sounds like it is running too lean.

Roy

Tiny

aaronmesker

September, 10, 2012 AT 2:23 AM

What would cause it to run too lean besides the ecu. It happened from sitting for like 2 months. At first I was able to start it with starting fluid and drive it without a problem then one night it just stalled when I pulled into my driveway sence then ive been having the problem im having thats why I changed the injectors

Tiny

ASEMaster6371

September, 10, 2012 AT 2:50 AM

12 lbs of fuel pressure sounds low. It should be around 15 lbs.

Roy

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