I replaced Bosch spark plug with AC. - 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 05-26-2004, 09:22 PM   #1
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Default I replaced Bosch spark plug with AC.

Mine is 94 SE

Because the engine lost power and noise, I replace Bosch spark plugs after I install them one week before. They are almost all with dark mark at head. I installed AC parts and it runs much smoother than last week. The Bosch spark plug is really disgusting.


I have a question: the spark plug that locates at the back middle is so hard to remove. I can not take it out at all so that I replaced just 5 spark plugs. Is there ant trick to do this?
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Old 05-26-2004, 09:29 PM   #2
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Use a syringe and apply some break free or penetrating oil when the engine is warm. Do that for 2 days. On the 3rd day, try to remove the plug with the engine COLD.

I agree with you completely on the Bosch plugs. We've been through that time and time again on this forum. For some reason, our hotter running engines don't like them. Rear plugs will almost always foul first. Hotter back there
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Old 05-26-2004, 09:56 PM   #3
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Quote:
Originally Posted by willwren
Use a syringe and apply some break free or penetrating oil when the engine is warm. Do that for 2 days. On the 3rd day, try to remove the plug with the engine COLD.

I agree with you completely on the Bosch plugs. We've been through that time and time again on this forum. For some reason, our hotter running engines don't like them. Rear plugs will almost always foul first. Hotter back there
Sorry that I did not explain my problem clearly.

IT is not the plug itself hard to be moved, but the wire. I can not take the wire off from the spark.

Thanks
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Old 05-26-2004, 10:08 PM   #4
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That'* ALOT easier. Go buy a $10 pair of spark plug wire pliers. Get it as far down the boot (closer to the head) as possible.
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Old 05-27-2004, 02:50 AM   #5
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It also helps to kind of "unscrew it". Keep twisting while pulling. That'* how I got mine off.

If you're anything like me, though, prepare to bleed some....
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Old 05-27-2004, 10:01 AM   #6
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Default

Quote:
Originally Posted by thaf
Quote:
Originally Posted by willwren
Use a syringe and apply some break free or penetrating oil when the engine is warm. Do that for 2 days. On the 3rd day, try to remove the plug with the engine COLD.

I agree with you completely on the Bosch plugs. We've been through that time and time again on this forum. For some reason, our hotter running engines don't like them. Rear plugs will almost always foul first. Hotter back there
Sorry that I did not explain my problem clearly.

IT is not the plug itself hard to be moved, but the wire. I can not take the wire off from the spark.

Thanks
I had the same issue on my Bonnies. What I did (against recommendation on this forum) is remove the stabalizing bar that goes from strut tower to strut tower. That really opens up the clearance. Just make sure you reinstall it in the EXACT same location from which it was removed or else the alignment will be off. I did mine carefully multiple times and never had an issue. It'* worth it in the end to gain the clearance. Good luck!!
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Old 05-27-2004, 10:21 AM   #7
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Default plugs

Got standard Bosch platinums on both my motors with no problems.
Improved mileage and smoother acceleration over the AC.
The boots act like a chinese finger when you try to pull them off.
Reach down as far as you can , twist and pull up.
What Bosch plugs are you guys using?
Standard stock 6241 $1.89 a plug and excellent performance.
Call Bosch @ 888-715-3616 explain your problem and they will check it out and may even give you new plugs.
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Old 05-27-2004, 10:39 AM   #8
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Default Re: plugs

Quote:
Originally Posted by SSEBONNE4EVA
Got standard Bosch platinums on both my motors with no problems.
Improved mileage and smoother acceleration over the AC.
The boots act like a chinese finger when you try to pull them off.
Reach down as far as you can , twist and pull up.
What Bosch plugs are you guys using?
Standard stock 6241 $1.89 a plug and excellent performance.
Call Bosch @ 888-715-3616 explain your problem and they will check it out and may even give you new plugs.
AC Delco Platinums in my 93 and never had an issue. Runs great.
In the 99, I use the Bosch +4s. I never really had an issue until recently. It seems to stumble on moderate acceleration. I'm going to return them (1 year warranty ) for the AC Delco Platinums.

Otherwise, I'm a believer in Bosch equipment (just not the plugs in the 3800s!)
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Old 05-27-2004, 11:05 AM   #9
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Default Re: plugs

[quote="vital49"]
Quote:
Originally Posted by SSEBONNE4EVA

Otherwise, I'm a believer in Bosch equipment (just not the plugs in the 3800s!)
Bosch O2 sensors are not happy in our cars either. MANY of us have had premature bosch spark plug and O2 failures in our cars. Bosch makes good stuff, but some just isn't compatible with our drivetrains.
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Old 05-27-2004, 11:22 AM   #10
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Default Re: plugs

[quote="willwren"]
Quote:
Originally Posted by vital49
Quote:
Originally Posted by SSEBONNE4EVA

Otherwise, I'm a believer in Bosch equipment (just not the plugs in the 3800s!)
Bosch O2 sensors are not happy in our cars either. MANY of us have had premature bosch spark plug and O2 failures in our cars. Bosch makes good stuff, but some just isn't compatible with our drivetrains.
Yes, agreed. However, I am using a Bosch O2 sensor in my 93. No issues yet in 10K miles. I'm keeping a close eye on her anyway, though! What are the signs of a failing O2 sensor other than poor gas mileage? I've never had one throw a SES light either...
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