98 bonneville 3.8 ROUGH IDLE AND SLUGGISH AT TIMES - 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 03-02-2008, 11:29 PM   #1
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Default 98 bonneville 3.8 ROUGH IDLE AND SLUGGISH AT TIMES

HELLLLLLLLLLP!
IVE REPLACED EVERYTHING UNDER THE SUN IN THE LAST 2 DAYS. PLUGS, WIRES,AIR FILTER, FUEL FILTER, PCV VALVE, EGR, O2 SENSOR, IGNITION MODULE. MY CAR STILL WANTS TO HESITATE WHEN ACCELERATING . IT DOESNT SLIP OR ANYTHING LIKE THAT JUST REAL SLUGGISH AT TIMES . THIS DOESNT HAPPEN ALL THE TIME, PERIODICALLY.. ANY ONE HAVE A CLUE?
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Old 03-02-2008, 11:40 PM   #2
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First, stop using all caps. That'* considered yelling on the internet.

Second, we need ALOT more specifics in describing your problem. When it happens, warmed up or not, in gear or not, do the rpm'* go up but not the speed, does it feel like a trans problem or engine problem and ALOT more.

If we're to help you, you have to help us. In addition, please put your car info in your sig. We need to know if you're supercharged (L67) or not (L36).

The first thing I'd ask you to do is pull all 6 spark plugs and take a very good picture of them and post it here.

The second thing I'll ask you to do is check your oil and coolant for level and color, and post your findings here.
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Old 03-04-2008, 04:29 AM   #3
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Default 1998 bonneville bogging out at times

not supercharged. it seems to happen when the car is warmed up. the rpms continue to go up but speed stays the same. just replaced plugs and wires and did oil change.replaced ignition module.fuel pressure regulator, air filter, pcv valve. i was told by a mechanic that bosch plugs are bad for gm cars. any truth to that?
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Old 03-04-2008, 04:31 AM   #4
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Default lack of fuel?

it does not feel like a trans problem! it just doesnt wanna accelerate at times
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Old 03-04-2008, 09:22 AM   #5
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Quote:
Originally Posted by willwren
The first thing I'd ask you to do is pull all 6 spark plugs and take a very good picture of them and post it here.

The second thing I'll ask you to do is check your oil and coolant for level and color, and post your findings here.
Please do these two things.

Bosch Platinum plugs are bad for GM cars that use the waste-spark (3-coil) system.

http://www.bonnevilleclub.com/forum/...=article&k=103
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Old 03-05-2008, 08:07 PM   #6
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Default still having that sluggish problem

any body have any other suggestions? ive replaced damn near everything to attempt to solve this bogging/sluggish problem. im clueless!!!!!!!!!!!!!!!!!!!!!!! all fluids look good and not dis-colored.
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Old 03-05-2008, 08:44 PM   #7
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I am new here but in the last few months i have learned that these guys will work with you until the end of your problems...however, you really need to LISTEN to what has been asked of you and respond to the questions. These are not "shot in the dark" questions, but instead they are questions to start through the diagnostic process. This process is two-fold. It is intended to save you money and to fix the problem correctly. Please re-read the last post from WillWren and answer the questions that were already asked. With those answers everyone here will have more information with which to attack your problem.

The coolant level question is VERY important, as you could be combusting it through the intake manifold without it ever changing the oil color...

Help us to help you....
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Old 03-05-2008, 10:29 PM   #8
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And if I can just jump in sideways for a moment.
Edub1981, would be good to have it scanned for engine codes too. Can have a great impact on diagnosing.
Back on the side.
Bill
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Old 03-08-2008, 08:24 PM   #9
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checkede codes, was an o2 sensor. but i replaced that as well! still same problem
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Old 03-08-2008, 08:47 PM   #10
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Quote:
Originally Posted by edub1981
checkede codes, was an o2 sensor. but i replaced that as well! still same problem
What kind of O2 sensor did you use? Please dont say Bosh.
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