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rich fifer
Novice
Sep 5, 2009, 9:20 AM
Post #1 of 5
(3574 views)
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my 97 bonneville, when it gets to operating temperature, will chug when climbing slight inclines..i have changed the tps...and it didnot solve the problem..any ideas?????
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 5, 2009, 9:30 AM
Post #2 of 5
(3570 views)
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Re: 97 bonneville
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I'd be suspecting exhaust restriction of some sort. Converters are the main culprit but a result not the cause in most cases. Any codes stored?
T
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rich fifer
Novice
Sep 6, 2009, 7:51 AM
Post #3 of 5
(3563 views)
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Re: 97 bonneville
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Tom, Thanks for the reply...no codes stored in computer....vehicle has great acceleration....what about an egr valve????
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Sidom
Veteran
/ Moderator
Sep 6, 2009, 8:31 AM
Post #4 of 5
(3556 views)
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Re: 97 bonneville
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Probably not an EGR valve, that isn't a common failure pattern for those. A quick check would be to disconnect it & take it for a spin.
With no codes you really have no starting point & just have to start checking the basics. Fuel pressure, ignition system and even though a battery won't typically cause this problem. You always want to make sure it's good before starting any testing as a bad battery can affect results. If your code reader/scanner has the ability to view a data stream, that information could be very helpful
Did you follow Tom's advise about checking the exhaust? Check vacuum and/or backpressure? This is one area I would be confirming or ruling out early on before getting to deep into it consider the nature of the problem.......
One thing you could also do before any testing if you want, would be to take care of any overdue maintenance. Plugs, filters (air & fuel), change oil, get some mass air flow cleaner & clean the MAF (a dirty maf could actually cause your problem with out setting a code), clean the throttle body, etc. Most stuff won't cause your problem but is stuff that need to be done to properly maintain the vehicle......
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rich fifer
Novice
Sep 7, 2009, 8:20 AM
Post #5 of 5
(3548 views)
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Re: 97 bonneville
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Sidom...Thanks for the reply....This problem is not unique to just my Pontiac...I have been on other sites and there are many people posting with this identical problem.....My sons...son-in-law has a 2001 G/Prix and it does the same thing...Another guy posting on a forum has spent 2000 dollars at a GM dealership trying to solve this issue...the dealer replaced oxy sensors, egr valve, torque converter, and now wants to rebuild the transmission...I know GM will not recall this as it will cost them MILLIONS..........but I cannot imagine someone has not cured this problem....I have changed the plugs, wires, oil and filter and trans service...I have not changed the oxy sensors....this same vehicle has an issue where the egr valve enters the intake plenum....the plastic manifold degrigates and coolant can enter the upper engine and when hole is big enough it will flood the engine and it will stall...at this point the plenum has to be replaced and the coolant removed from the engine oil pan, cylinders and exhaust pipes...that is when everything was changed and it still chuggs after getting to operating temps...my advise is to buy a Ford.....that is my next move.....I have had a GM ever since I started driving....but this is my last one.....and I am 59....
Thanks for the help....
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