1993 Bonne runs rough - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-21-2004, 11:40 AM   #1
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Default 1993 Bonne runs rough

1993 SSE runs rough under load. It seems to be missing intermitently. I changed the plugs & it has not improved. I did not change the wires...they were changed only 18 months ago.
Also ran some injector cleaner through the gas tank.
Any idea where I should start?
Thanks for the help!
John
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Old 06-21-2004, 11:44 AM   #2
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might be a bad injector.
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Old 06-21-2004, 12:05 PM   #3
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Default 1993 Bonne runs rough

Are the injectors difficult to take out & clean?
Also, I have been reading the forums quote a bit this morning & notice many Bonne owners mentione the
MAF sensor when discussing rough running Bonnies. Where is the Mass Air Flow sensor & what is the removal & cleaning technique?
Also, cound a bad coil cause my problem?
I also forgot to mention that I changed the fuel filter prior to the engine running rough.
Thanks again!
John
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Old 06-21-2004, 12:07 PM   #4
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Default 1993 Bonne runs rough

One more thing I failed to mention...gas mileage is horrible...less than 200 miles per tank!
John
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Old 06-21-2004, 12:47 PM   #5
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Default 1993 Bonne runs rough

Thanks jr3800. I used Autolite platinum plugs. I think the injector cleaner was the cheapo Wal-Mart store brand.
Where is the MAF sensor & the IAT sensor located? Can these be cleaned or must they be replaced?
As for the cat converter, I was told a few years ago that it is shot, as in it no longer functions, like it was blown out or something. Since then, the exhaust is a bit more noisy than before. But, the gas mileage was still ok when the cat was dignosed as "gone".
I plan on replacing the 02 sensor, which I don't believe has ever been replaced!
Any tips on taking the fuel injector out & recommended cleaning method?
Thanks,
John
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Old 06-21-2004, 01:56 PM   #6
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for your Cat converter, are you hearing a rattle like sound underneath youtr car?
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Old 06-21-2004, 02:54 PM   #7
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Default 1993 onne runs rough

Actually, I used to hear a rattle type sound under the car when running, but I'm not sure that sound still exists? I'll check when my Son returns with the car.
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Old 06-21-2004, 06:04 PM   #8
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Default Re: 1993 onne runs rough

Quote:
Originally Posted by John Kirk
I'll check when my Son returns with the car.
Ah.

Try having your son not drive the car; that might improve its gas mileage...

(Ducking and running for cover now... )
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Old 06-21-2004, 06:11 PM   #9
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Do you have a service engine soon light?
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Old 06-21-2004, 06:49 PM   #10
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Default Re: 1993 Bonne runs rough

Quote:
Originally Posted by John Kirk
But, the gas mileage was still ok when the cat was dignosed as "gone".
I plan on replacing the 02 sensor, which I don't believe has ever been replaced!
I think I'll vote for replacing the O2 sensor first (be sure to buy AC-Delco, not Bosch, and it'* easy to do it yourself with a couple of long extensions). Also check your tire pressures all around and get them up to 35 psi if they're not there already.
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