stumbling start and accelleration hesitation - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Tempo Forum | Mercury Topaz Forum Forum for discussion of the Ford Tempo and Mercury Topaz.

LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 07-28-03, 09:51 AM
Posts: n/a
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?

Sponsored Links
post #2 of 3 (permalink) Old 07-28-03, 11:03 AM
***** Idiot....
LunaticSVT's Avatar
Join Date: Feb 2001
Location: The Sticks of Central TX
Posts: 10,560
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.
LunaticSVT is offline  
post #3 of 3 (permalink) Old 02-12-04, 07:25 AM
Registered User
Join Date: Feb 2004
Posts: 2
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.
Oldluke is offline  
Sponsored Links

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Cars and PAG Vehicles > Ford Tempo Forum | Mercury Topaz Forum
Gear in this thread - Powered by O'Reilly Auto Parts

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
Should I start getting stroppy? Lightning General Tech 6 02-26-02 09:01 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome