do I need a tune up? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-17-2010, 05:32 PM   #11
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I don't recall any problem with Bosch spark plugs. However, Bosch O2 sensors on the other hand are not recommended.
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Old 05-18-2010, 12:25 AM   #12
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ok well I called up a friend that works at a dealership. I put all oem parts in and went with the irridium plugs. I got them at dealer cost so I paid like $85 for both. After I changed them out(one at a time to not cross wires) I drove it for a while hoping that the ses ligt would go out... It didn't lol! And it still ran rough. When I slowed down to stop, the light would stay on and it ideled rough. When I accellerated it would begin blinking. I still smelled that horrible smell too. I drove it for amost an hour and it didn't go away. I only changed the plugs and wires. Is it time to look at the coil?
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Old 05-18-2010, 12:28 AM   #13
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Try unplugging the MAF and driving. It will stumble a bit at first and if it smooths out and drives fine, the MAF is likely bad. If no change then test your coils.
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Old 05-18-2010, 11:40 PM   #14
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#'* 2 and 5 cylinders had weak sparks. I swapped out the coil and it was instantly night and day! My friend at the dealership put it on the scanner and found it. I got a new coil for like $36. I also learned that my injector o-rings look like a dog chewed them. They gave me some new ones for free so I will change them soon too! Thank you for all of your help guys. I really appreciate it
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Old 05-18-2010, 11:42 PM   #15
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Good to hear. Another easy fix.
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