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Car runs at idle when goes over 35mph dies

Tiny
ROYZ11
  • MEMBER
  • 1990 PONTIAC GRAND PRIX
  • 200,000 MILES
Replaced fuel pump and filter ck fuel pressure gd has spark constent
Friday, September 16th, 2011 AT 12:02 AM

5 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Have you checked for codes?Have you checked your exhaust back pressure?
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Friday, September 16th, 2011 AT 12:33 AM
Tiny
ROYZ11
  • MEMBER
  • 3 POSTS
How do you ck back pressure
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Friday, September 16th, 2011 AT 1:04 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
You would remove the o2 sensor install the back pressure tester adapter where the o2 sensor goes. Then hook up the gauge start the car hold the rpms up to about 2,000 rpms for 30 seconds and see what the readings are. Or take it to a exhaust shop and have them test it. Have you checked for codes?
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Friday, September 16th, 2011 AT 1:27 AM
Tiny
ROYZ11
  • MEMBER
  • 3 POSTS
Map sensor came up 33 44 45
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Friday, September 16th, 2011 AT 1:37 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
I need to know what size engine you have and if its thr 3.1L if its turbo or not?Also do you have a scan too that can read live engine data on your car?
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Saturday, September 17th, 2011 AT 12:05 AM

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