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 Hesitate & miss when warm. Guess ?

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sj95rmw



Posts : 45
Join date : 2014-01-08

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PostSubject: Hesitate & miss when warm. Guess ?   Hesitate & miss when warm. Guess ? Icon_minitimeThu Oct 23, 2014 7:41 pm

My 95 wagon starts right up & runs fine when cold. But once it warms up, I get a bad miss or hesitation.
It's like one or more cylinders are not firing or producing any power. Any advice ? TIA.
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Fred Kiehl

Fred Kiehl

Posts : 5199
Join date : 2009-11-13
Age : 70
Location : Largo, FL 33774

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PostSubject: Re: Hesitate & miss when warm. Guess ?   Hesitate & miss when warm. Guess ? Icon_minitimeThu Oct 23, 2014 9:18 pm

Do you have any codes?
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buickwagon

buickwagon

Posts : 951
Join date : 2011-06-10
Location : Muskoka, Ontario

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PostSubject: Re: Hesitate & miss when warm. Guess ?   Hesitate & miss when warm. Guess ? Icon_minitimeFri Oct 24, 2014 9:51 am

Could be as simple as a bad coolant temperature sensor. Or as nasty as a failing optispark module. Codes can be a guidance, but sometimes a problem is not quite bad enough to set a code. You may need a scan tool to look at the raw data. Some things (like the temperature sensor) you can hunt down with a multi-meter and the expected values from the Factory Service Manual, but the scan tool can be a real time saver even then.
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sj95rmw



Posts : 45
Join date : 2014-01-08

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PostSubject: Re: Hesitate & miss when warm. Guess ?   Hesitate & miss when warm. Guess ? Icon_minitimeFri Oct 24, 2014 11:04 am

Don't have a code. Haven't hooked up my scanner. Haven't dragged out my FSM & studied all
the steps needed to diagnose the problem. I was just hoping for a lucky shot. I need to clear out
my garage & get things set up before I can make a serious methodical effort to fix all of the
problems with the wagon. I think the reverse on the 4l60e is also slipping badly.
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lamune

lamune

Posts : 681
Join date : 2014-05-09
Location : Seattle

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PostSubject: Re: Hesitate & miss when warm. Guess ?   Hesitate & miss when warm. Guess ? Icon_minitimeFri Nov 21, 2014 7:05 pm

how about oxygen senors? If it runs ok in open-loop but poorly when in closed-loop mode, that may be the cause. The OXS is one of the primary inputs in closed-loop mode.
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fmlm83



Posts : 17
Join date : 2013-02-03
Age : 60
Location : West Central Illinois

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PostSubject: Re: Hesitate & miss when warm. Guess ?   Hesitate & miss when warm. Guess ? Icon_minitimeWed Nov 26, 2014 10:55 pm

Sounds like mine last summer. Found out the timing was off. After I spent over hundred on new parts. Sad
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PostSubject: Re: Hesitate & miss when warm. Guess ?   Hesitate & miss when warm. Guess ? Icon_minitime

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