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  #1  
Old 03-01-2013, 11:18 PM
davew833 davew833 is offline
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Location: Salt Lake City, UT
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Sluggish & bucking when cold...

My '94 Bordeaux 2wd starts right up in the morning but it's sluggish and kind of bucks or jerks a little until it warms up. I've tried the following in the past few months to get it to run better:

-Store-brand fuel injector cleaner
-Chevron/Techron fuel injector cleaner
-replaced the PCV valve
-checked and replaced all the little vacuum lines under the intake manifold
-checked the big vacuum lines and the intake snorkel- repaired a small crack in that.
-new spark plugs and checked all the coil boots
-checked the fuel injectors with a stethoscope and they all seem to be clicking properly
-Always use 91 octane (highest we get in Utah)
-No check engine lights/codes

Any suggestions on what to try next?

Could this be a transmission issue? The engine seems to rev freely and smoothly in neutral but bogs down in gear. I replaced the trans fluid and filter recently as well.
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  #2  
Old 03-02-2013, 12:59 AM
bishop bishop is offline
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Re: Sluggish & bucking when cold...

check the TPS (ThrottlePositionSensor) should read .5v with the throttle closed iirc.
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  #3  
Old 03-02-2013, 02:04 AM
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icingdeath88 icingdeath88 is offline
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Re: Sluggish & bucking when cold...

Tried replacing the coolant temp sensor?
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Old 03-02-2013, 02:51 AM
bishop bishop is offline
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Re: Sluggish & bucking when cold...

Quote:
Originally Posted by icingdeath88 View Post
Tried replacing the coolant temp sensor?
Doh! this first, temp sensor caused major problems on a friends car.
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  #5  
Old 03-04-2013, 02:42 PM
davew833 davew833 is offline
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Re: Sluggish & bucking when cold...

Not the coolant temp sensor- replaced that today when the car was dead cold. The one I took out didn't look very old either.
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