1991 Chevrolet Lumina rough idle, dies.

1991 CHEVROLET LUMINA
152,000 MILES • 3.1L • V6 • FWD • AUTOMATIC
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MIKE LUCKEY
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  • 38 POSTS
while driving, the car started running rough and died. Limped it home (only a few blocks running badly). Next day, installed new fuel filter and car ran fine . drove it around for about 30 minutes, then parked it for about an hour, it wouldn't start. It finally starts then but runs rough and dies. Fuel Pressure is within acceptable limits, and the OBD1 system is throwing no codes. It did however die at stoplights occasionally about a week ago. Also used ether to check for vacuum leaks, and couldn't locate any. Any help would be appreciated, thank you, Mike.
Jan 20, 2014 at 6:31 AM
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JDL
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What is the fuel pressure spec, just curious? Did you check to see if correct fuel pressure held with key off? if pressure drops like a rock, you have a leak. If idle issues, check anything that has to do with idle system, check the iac and passages.

Check the 02 sensor signal, see if it is running rich or lean. If your running rich, check the coolant temp sensor.
Jan 20, 2014 at 7:28 AM
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JDL
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Just to add, how long since a tune-up?
Jan 20, 2014 at 7:31 AM
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MIKE LUCKEY
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  • 38 POSTS
Pressure spec 40-47 lbs. Mine41,I did not check to see if the pressure dropped, but I will!. It had a new iac @ 129000 and full tune-up @121000. It has 152000 now. Also, wouldn't an 02 sensor throw a code? Thanks much for your help! Mike.
Jan 20, 2014 at 9:19 AM
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JDL
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May not always set a code? My main concern was if your running rich or lean? Anymore 02 sensors are part of a tune-up.
Jan 20, 2014 at 11:00 PM
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MIKE LUCKEY
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fuel pressure spec is 41-47 lbs. after a number of tests, it is around 40-41, but I had one test at 38. Also, while running, the pressure is 35 ish. If the car dies, which it does, it goes back to 40, and then after a few minutes bleeds down a bit but very slowly.
Mar 12, 2014 at 1:59 PM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
Your fuel pressure sounds ok. Check for egr and or vacuum leak. Without something to hang our hat on, it's just hunt and peck, for me.
Mar 13, 2014 at 5:15 AM
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