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engine mystery


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mychevy
New User

Jul 24, 2009, 1:00 PM

Post #1 of 3 (1268 views)
engine mystery Sign In

93 chevy s10 4/4 6cly. tbi z engine
truck was runnig fine untill one morning it started hard and would not idle unless i kept pumping gas pedal (3 or 4 min.}once temp needle began to move the engine suddenly started running normal.it will start and run fine after that ,untill it sits overnight,then the same thing happens.
please help!!Crazy


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 24, 2009, 1:30 PM

Post #2 of 3 (1259 views)
Re: engine mystery Sign In

The symptoms sound like a fuel pump failing but you'll have to wait until it happens again to be able to verify that with a fuel pressure gauge.



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Sidom
Veteran / Moderator
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Jul 24, 2009, 1:38 PM

Post #3 of 3 (1255 views)
Re: engine mystery Sign In

Could possibly be a fuel problem as HT suggested, although with TBI systems a fuel prob wouldn't seem to last so long....Those'll run on almost nothing....

A cold soak data stream would be nice to see. Check your air & coolant temps, see how long it's taking to go into closed loop, etc.

Is the check engine light on? ever?






 
 
 






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