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post #1 of 3 (permalink) Old 07-28-03, 08:51 AM
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stumbling start and accelleration hesitation

Hello everyone. My 90 Topaz for years has stumbled and bumbled when I start it cold. If it sits overnight, it seems to have this problem. I have ruled out fuel pump problems as I turn the ignition on and allow the fuel pump to run for 1.5-2 seconds before starting. Once it is started and stumbles for about 4-5 seconds, its idles just fine. As of late, it requires a little throttle to "clean" it out when starting. Might this be caused by a bad air charge sensor?

Second question might be related to the first. When the engine hasn't fully warmed up, there is a hesistation just off idle when accellerating. Once it warms up, it doesn't seem to be there or be as bad. Any ideas?


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post #2 of 3 (permalink) Old 07-28-03, 10:03 AM
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Join Date: Feb 2001
Location: The Sticks of Central TX
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Re: stumbling start and accelleration hesitation

1. EGR valve sticking.
2. Sparking Plugs. < should affect through out, but look anyhow >
3. TPS sensor bad fooling the ECM into thinking you closed throttle.
4. MAP sensor out to lunch intermittently, leaning or enrichening mix.

Pull the codes, and see what you find before spending $$. The TPS can cause the trans to drop out of OD if yours has an AXOD.

Again, pull the codes first.
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post #3 of 3 (permalink) Old 02-12-04, 06:25 AM
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Re: stumbling start and accelleration hesitation

I'd suggest cleaning the throttle body. Yes, I know your not suppose to do this, but it's amazing how many problems of this nature I've fixed on Tempo/Topaz's this way.

Carefully remove the throttle body and wash out the bore using gasoline and a soft brush. Absolutely do not submerge it or use a scraper or wire brush. Be sure to remove all traces of sludge/carbon from the back side of the butterfly and the bore. Install using a new gasket and torque to specifications using a criss-cross pattern.
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