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Tiny
KDAVILLE
  • MEMBER
  • 1992 BUICK ROADMASTER
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
I own A Buick Roadmaster 92 5.7 liter v8 I was driving on the freeway and I exited I was about half a block from the exit my car sputtered and died I remove the exhaust manifolds and tried to start it and it started we assembled it and drove home but all the sudden I could only drive it slow and was barely pressing the paddle if I press the pedal to the floor it acted like it wanted to die but if I lightly press the pedal it went so I assumed it was the fuel filter which I replace and it still had the same problem so my next assumption was the fuel pump so I replaced the fuel pump and I'm still having the same problem and I'm not sure what it is I'm thinking it could be something to do with the EVAP system my friend suggested it might be the EVAP purge switch which could be possibly stuck open but I'm not sure your opinion would be very helpful thank you
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Thursday, February 11th, 2016 AT 8:13 PM

6 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Is there a a lot of exhaust coming out of the exhaust pipe when pressing the gas pedal?You could have a plugged cat. You should have the exhaust back pressure test to eliminate that as a possibility.
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Thursday, February 11th, 2016 AT 9:50 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Iam doing good you can get a exhaust back pressure test done at a exhaust shop. So does the car not shift until you let up on the gas pedal a little bit?
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Thursday, February 11th, 2016 AT 10:01 PM
Tiny
KDAVILLE
  • MEMBER
  • 3 POSTS
I've never really had an issue with the shifting but before when I would try to floor it would rev really high before shifting and there was also slight power loss before the shift
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Thursday, February 11th, 2016 AT 11:05 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Does this car have the distributor down at the crankshaft?
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Monday, March 7th, 2016 AT 10:47 AM
Tiny
KDAVILLE
  • MEMBER
  • 3 POSTS
No it's behind the manifold topside
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Monday, March 7th, 2016 AT 11:04 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
It almost sounds like fuel contamination this is difficult to look for because you have to drop the tank and remove the fuel pump then look inside with a flashlight.

Here is a video on it

https://www.youtube.com/watch?v=SOmd3BoE4YU

Please get back to us so you can help others with the same problem.
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Monday, March 7th, 2016 AT 11:50 AM

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