Engine runs rough only will stay running if you flutter the throttle

Tiny
AARONMESKER
  • MEMBER
  • 1990 CHEVROLET S-10
  • 180,000 MILES
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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Monday, September 10th, 2012 AT 1:44 AM

6 Replies

Tiny
ASEMASTER6371
  • EXPERT
What is the actual fuel pressure?

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

Roy
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Monday, September 10th, 2012 AT 1:46 AM
Tiny
AARONMESKER
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I dont believe it has any vacuum leaks fuel pressure is about 12psi
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Monday, September 10th, 2012 AT 1:50 AM
Tiny
AARONMESKER
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Did I mention it also back fires shoots a good flame too
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Monday, September 10th, 2012 AT 1:54 AM
Tiny
ASEMASTER6371
  • EXPERT
Verify that the wires are going to the correct plug. Otherwise it sounds like it is running too lean.

Roy
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Monday, September 10th, 2012 AT 2:15 AM
Tiny
AARONMESKER
  • MEMBER
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
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Monday, September 10th, 2012 AT 2:23 AM
Tiny
ASEMASTER6371
  • EXPERT
12 lbs of fuel pressure sounds low. It should be around 15 lbs.

Roy
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Monday, September 10th, 2012 AT 2:50 AM

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