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1992 Buick Century EGR Valve?

Tiny
BERTBERT1971
  • MEMBER
  • 1992 BUICK CENTURY
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 152,000 MILES
My car has started running very rough. I have to floor the gas pedal for awhile to start it. It runs very rough at idle. It accellerates ok, but when I let off and coast it starts to "buck". When I come to a stop it usually dies, unless I keep my foot on the gas to throttle it up. I have changed the fuel filter, and all of the vacuum hoses. Some were split and dry rotted. Two going to the fuel canister were unplugged, plugged them back in. I put some seafoam in the oil and the gas. I started it, and it ran fine, I let it sit overnight and it was right back to running bad. The symptoms are just like a bad EGR valve? I cannot locate the valve though? Can you tell me where it is located? Or, do you think it could be something else? Thanks for your time.
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Monday, June 1st, 2009 AT 1:58 PM

7 Replies

Tiny
JALOPYPAPA
  • MEMBER
  • 467 POSTS
This engine doesn't have an egr valve.
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Tuesday, June 2nd, 2009 AT 8:14 AM
Tiny
BERTBERT1971
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  • 4 POSTS
I couldn't find an EGR valve on it, so I was wondering. Thanks for the reply. Do you know what my problem could be?
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Tuesday, June 2nd, 2009 AT 8:41 PM
Tiny
JALOPYPAPA
  • MEMBER
  • 467 POSTS
Sorry, there are many possibilities for what you describe. I would start with electrical, making sure the plugs and wires are all OK--no cracked electrodes, spark gaps in tolerance, no carbon tracks, wires undamaged and within resistance specs. Then test each coil for a good output. Then fuel pressure and operation of injectors. Finally, if all that checks out, I'd check voltage signals from sensors.
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Tuesday, June 2nd, 2009 AT 9:03 PM
Tiny
BERTBERT1971
  • MEMBER
  • 4 POSTS
Thanks for the reply jalopypapa.
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Wednesday, June 3rd, 2009 AT 6:55 PM
Tiny
JALOPYPAPA
  • MEMBER
  • 467 POSTS
Maybe after plugs and wires I would next check the idle air control valve on the side of the throttle body. You can check voltage, take it off and clean it and see if that helps.
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Thursday, June 4th, 2009 AT 7:28 AM
Tiny
BERTBERT1971
  • MEMBER
  • 4 POSTS
Thanks again for the info, I did check the plugs and wires. I also checked the Idle Air Control Valve. I took it apart and cleaned it. I did not check voltage, didn't have any way of doing that. I took it into the shop where I work, and tested it with the scanner. O2 sensor showed up, not sure if that is the problem or not. I can't really afford to just start replacing a bunch of parts til I find the right one. Not really sure what to replace first, but I'm gonna have to start somewhere I guess. Thanks again.
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Thursday, June 4th, 2009 AT 9:01 PM
Tiny
LOUT5369
  • MECHANIC
  • 217 POSTS
You could possibly have a bad Catalitic converter, one that is partially clogged would cause your problems, standing on the gas puts the computer into clear flood mode, shutting off fuel, I would have someone start the car, and then you take your hand with a thick rag and block off the tailpipe while your friend raises the engine rpm the exhaust should push your hand away, be sure to use something to block the pipe, DO NOT USE YOUR HAND WITHOUT PROTECTION YOU WILL GET BURNED. If the system has no pressure you have a bad cat.
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Tuesday, July 21st, 2009 AT 9:57 AM

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