Question about Buick Enclave

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My 2008 Buick Enclave CXL, V6 Automatic has a problem when trying to increase speed going up a grade or going to the passing gear. First it hesitates as you press on the accelerator then it surges ahead. I have been told to have the GM Service people check the TPS (Throttle Positioning Sensor) they say the test proves it is ok but they test it on a trial drive and I was told they don't even need the motor running to test that sensor. They have upgraded the computer software having to do with downshifting but that didn't fix the problem. We are from Texas and temporairly living in PA where there are many more hilly highways and this problem occurs more often up here.

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  • Buick Master
  • 6,826 Answers

I happen to live in Pennsylvania where it is indeed hilly. The TPS can be checked by an engine analyzer or scanner for continuity of resistance increase as you press the pedal down further until it hits 100% with a minimum of 5% when your accelerator pedal is not depressed.

If the engine hesitates and then surges ahead, this points to a possible tune up problem. But, if you have no misses on the OBDII system at the dealer (and that's where a late model car should go) and no service engine soon light then this is certainly a mystery.

Nowadays, they can modify the characteristics of the computer's software to downshift in hopes that the mechanical advantage can overcome any initial hesitation. But, you're saying this is not good enough.

How many miles does it have? Have you had it tuned up regularly?

Posted on Jul 16, 2010

  • hatten99 Jul 16, 2010

    My Enclave has 53K miles. I had the local dealership analyze the problem 2 weeks ago. Their reply was GM is working on the on it, which is a common problem, but a servicing of the enjectors (for $99) may help!

  • Duane Wong
    Duane Wong Jul 16, 2010

    Walmart can add fuel injector cleaner directly for a lower price, I forget what, but it's like under $75 I believe.



    You can add injector cleaner to the gas tank and pay $5 to $7 for the concentrated STP fuel injector and fuel system cleaner, available where you buy gas, or at Walmart or auto parts store.



    I wish you luck in fixing this problem.

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