# 1999 Pontiac Bonneville Engine Problem

**URL:** <https://community.cartalk.com/t/1999-pontiac-bonneville-engine-problem/17941>\
**Category:** Maintenance/Repairs\
**Created:** [August 10, 2008, 3:06pm UTC](https://community.cartalk.com/t/1999-pontiac-bonneville-engine-problem/17941 "2008-08-10T15:06:32Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![marktwark](https://avatars.discourse-cdn.com/v4/letter/m/e95f7d/32.png) [@marktwark](https://community.cartalk.com/u/marktwark)\
**Post date:** [August 10, 2008, 3:06pm UTC](https://community.cartalk.com/t/1999-pontiac-bonneville-engine-problem/17941/1 "2008-08-10T15:06:32Z")

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This Bonneville suddenly began running erratically. At stop signs it nearly quits. It has left no code. Is there any test for the MAF or TP sensors? Any other suggestions?

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**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\
**Post date:** [August 10, 2008, 5:30pm UTC](https://community.cartalk.com/t/1999-pontiac-bonneville-engine-problem/17941/2 "2008-08-10T17:30:21Z")

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I would check all the normal tuneup items. Also check for a intake manifold air leak and bad fuel filter. Cleaning the MAF sensor may help also though I don’t think it would cause an idle problem.

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**Author:** ![Chevy454SS](https://avatars.discourse-cdn.com/v4/letter/c/ecae2f/32.png) [@Chevy454SS](https://community.cartalk.com/u/Chevy454SS)\
**Post date:** [August 10, 2008, 6:15pm UTC](https://community.cartalk.com/t/1999-pontiac-bonneville-engine-problem/17941/3 "2008-08-10T18:15:20Z")

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The Check Engine light should come on if there is a problem with a sensor, its probably a fuel problem.

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**Author:** ![bing](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bing/32/4619_2.png) [@bing](https://community.cartalk.com/u/bing)\
**Post date:** [August 10, 2008, 9:31pm UTC](https://community.cartalk.com/t/1999-pontiac-bonneville-engine-problem/17941/4 "2008-08-10T21:31:37Z")

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Yep, you should get a code if it is the TPS or IAC. You can put an ohm meter on the TPS and see if you get a smooth response throughout its travel. I would check fuel pressure and fuel pressure regulator and check for any vacume leaks.

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**Author:** ![vwfueldoor](https://avatars.discourse-cdn.com/v4/letter/v/e95f7d/32.png) [@vwfueldoor](https://community.cartalk.com/u/vwfueldoor)\
**Post date:** [August 10, 2008, 10:47pm UTC](https://community.cartalk.com/t/1999-pontiac-bonneville-engine-problem/17941/5 "2008-08-10T22:47:36Z")

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yep!

smack the maf while ideling.

not stupid hard,did that change its idle?

auto? TCC solenoid?

plug wires?  
plugs?

unhook the maf,did it change ?

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**Author:** ![vwfueldoor](https://avatars.discourse-cdn.com/v4/letter/v/e95f7d/32.png) [@vwfueldoor](https://community.cartalk.com/u/vwfueldoor)\
**Post date:** [August 10, 2008, 10:48pm UTC](https://community.cartalk.com/t/1999-pontiac-bonneville-engine-problem/17941/6 "2008-08-10T22:48:53Z")

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ummm!

graph it,much more accurate.