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1991 Chevrolet Lumina Please Help

Tiny
MYKE5
  • MEMBER
  • 1991 CHEVROLET LUMINA
  • 3.1L
  • 6 CYL
  • FWD
  • 100,000 MILES
Car starts right away however when I give it gas it boggles out. Ive changed the ignition coils, spark plugs, spark plug wires, fuel pump, fuel filter, map sensor, and oxygen censor. Still hasn't fixed the problem. Any suggestions?
Tuesday, June 9th, 2015 AT 11:27 AM

3 Replies

Tiny
CATAFINA
  • MECHANIC
  • 167 POSTS
Try checking the fuel pressure if its within specs if ok-check the operation of the EGR and TPS
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Tuesday, June 9th, 2015 AT 11:51 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I saw what you replaced. Did you do any testing, first? Did you use a gage and check proper fuel pressure? Does the fuel pressure hold for a bit with everything off? Check fuel trims, is it running rich or lean? You might be able to use a digital multimeter on the 02 sensor wire, one wire, above.450 and stays there, it is rich, below.450 and it's lean. Usually it should switch a little above and below.450. Any applicable trouble codes? Your obd1, you should be able to check some codes, yourself, if your check engine light works.

Will it rev up and down ok in park?
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Tuesday, June 9th, 2015 AT 12:00 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Bad Mass Air Flows were pretty common to act like that also if the fuel pressure looks good.
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Tuesday, June 9th, 2015 AT 12:50 PM

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