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When the car starts it runs ragged and tries to stall

Tiny
VINCE LETTAU
  • MEMBER
  • 1990 CADILLAC FLEETWOOD
  • V8
  • 2WD
  • AUTOMATIC
  • 112,000 MILES
The engine runs real rough when it starts and backfires then after it starts to idle it runs good, but when you come to a stop or turn it want to surge. Someone said to disconnect the air compressor witch I did and did not make a difference. One time it backed fired going down the road at 55 mph and blew the muffler off. Any ideas?
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Tuesday, November 27th, 2018 AT 5:27 PM

6 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Hello,

This sounds like a weak fuel pump. To be sure lets run down these two guides to check the pressure and get run the codes.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Thursday, November 29th, 2018 AT 11:29 AM
Tiny
VINCE LETTAU
  • MEMBER
  • 33 POSTS
When I get a fuel pressure gauge I will let you know. Thanks
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Thursday, November 29th, 2018 AT 1:48 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
They will rent one to you for free at AutoZone.
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Friday, November 30th, 2018 AT 10:42 AM
Tiny
VINCE LETTAU
  • MEMBER
  • 33 POSTS
Thank you. I will go up there and see about getting one.
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Friday, November 30th, 2018 AT 3:59 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Okay let us know what happens.
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Saturday, December 1st, 2018 AT 11:15 AM
Tiny
VINCE LETTAU
  • MEMBER
  • 33 POSTS
Thanks.
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Sunday, December 2nd, 2018 AT 3:27 PM

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