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02 buick hesitates loses power


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dougcrv24
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Aug 24, 2009, 4:13 AM

Post #1 of 10 (1203 views)
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02 buick hesitates loses power Sign In

I have an 02 buick century 3.1 v-6. The car runs, but hesitates and chugs at low speed and during acceleration, also loses power at highway speeds. Seems to run fine at a stand still and while reving the motor, and will accelerate if you jump in the gas. I have changed the plugs with AC delco plugs, changed the MAF sensor, and air filter....still have the problem...help?


Hammer Time
Ultimate Carjunky / Moderator
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Aug 24, 2009, 4:27 AM

Post #2 of 10 (1177 views)
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Re: 02 buick hesitates loses power [In reply to] Sign In

It sounds like it may be misfiring. If so, you want to make sure it has relatively new plug wires and it that doesn't resolve it, it's likely a bad coil.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



dougcrv24
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Aug 24, 2009, 4:32 AM

Post #3 of 10 (1174 views)
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Re: 02 buick hesitates loses power [In reply to] Sign In

Thanks. I'll try the new wires and see what happens. Where is the coil located if I need to replace it?


Hammer Time
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Aug 24, 2009, 4:40 AM

Post #4 of 10 (1170 views)
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Re: 02 buick hesitates loses power [In reply to] Sign In

Just follow the wires back to the coil. I believe they are mounted right on top of the rear valve cover. You will first have to determine which cylinder is misfiring to know which coil is the problem.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



dougcrv24
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Aug 24, 2009, 6:07 AM

Post #5 of 10 (1162 views)
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Re: 02 buick hesitates loses power [In reply to] Sign In

I have the new wires and will be putting them on shortly. I also had a local shop check to see if there were any codes stored....none other than a miscellaneous misfire code in the history. If the wires do not solve the problem how do I determine which cylinder is missing, and thus which coil to replace?
Thank you again for the guidance.
-Doug


Hammer Time
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Aug 24, 2009, 6:14 AM

Post #6 of 10 (1158 views)
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Re: 02 buick hesitates loses power [In reply to] Sign In

If it's a constant miss, then you can find it with a spark tester but if you getting a PO300, then it's likely not just one cylinder and you could have other issues.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



dougcrv24
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Aug 24, 2009, 8:28 AM

Post #7 of 10 (1153 views)
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Re: 02 buick hesitates loses power [In reply to] Sign In

I have now replaced the spark plugs, wires, 3- coil packs, MAF sensor, and air filter. $350 later I still have the same problem with no codes showing. Fell like I am chasing a ghost.....and he's getting expensive to chase. Where do I go from here?
thanks.


Hammer Time
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Aug 24, 2009, 8:37 AM

Post #8 of 10 (1146 views)
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Re: 02 buick hesitates loses power [In reply to] Sign In

Maybe you should stop throwing parts at it and have it diagnosed correctly. I advised you to use a spark tester that costs $4 and instead you replaced all the coils. You could have had it diagnosed professionally for well under $100. Your description doesn't give me the info I need to know what your experiencing.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



dougcrv24
Novice

Aug 24, 2009, 8:42 AM

Post #9 of 10 (1140 views)
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Re: 02 buick hesitates loses power [In reply to] Sign In

Fair statement. As I mentioned I did take it in earlier this morning and was told that without codes to follow they could spend several hours trying to diag the problem. I thought putting on the wires and the coil packs looked easy enough before authorizing $300 or so for a diagnosis. I'll take it back to them. Thanks for trying to help.


Hammer Time
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Aug 24, 2009, 8:45 AM

Post #10 of 10 (1134 views)
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Re: 02 buick hesitates loses power [In reply to] Sign In

If they want $300 to diagnose that problem, then find another shop. I own a shop and the max diagnostic I charge is $82. The wires it probably needed anyway but not all 3 coils.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.





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