Mechanics

STARTS FINE IDLES HIGH THEN WHEN IDLES DOWN TRUCK STARTS SMOKING BAD AND STUMBLE BAD ON ACCELERATION AND THEN DIES

1992 GMC Typhoon • 93,000 miles

Put in new fuel injectors fuel regulator coolant temper sensor map sensor oxygen sensor fuel pump ignition module new plugs wires fuel relay vacum lines checked timing no codes showing
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Richardbrown1
September 14, 2012.



What kind of smoke is it? Is it burning oil, is it trying to flood? Look at the 02 sensor signal, is it running rich or lean? I saw what you replaced, didn't see much testing. What about idle air system?


JDL
Sep 14, 2012.
Its grey and black I can hold at 3k runs smoooth until it gets to rich and belows out smoke and dies running rich tested throtle positin sensor and map sensor not burning oil no on idle air system is tht big square connector


Tiny
Richardbrown1
Sep 14, 2012.
5volts at map grey 4.73 at midddle wire 1 volt at coolant sensor wire either un plugged or plugged map sensor same.


Tiny
Richardbrown1
Sep 14, 2012.
If you have the vin Z, that shows to be throttle-body injection. Idle air control valve on side of throttle-body.


JDL
Sep 14, 2012.
Yes its Z what do I do with it / how to test it?


Tiny
Richardbrown1
Sep 15, 2012.
Here is flow chart for iac.


JDL
Sep 15, 2012.
Put in new idle air valve does same thing idles high then comes down starts stmbling smoking bad then die when given gas not burning oil. Idle air valve old was solid black on end of it.


Tiny
Richardbrown1
Oct 1, 2012.
No response back yet


Tiny
Richardbrown1
Oct 4, 2012.
You'll have to ask somebody else, I don't know what else to yell you?


JDL
Oct 14, 2012.
Anyone else know whats wrong with my truck thanks


Tiny
Richardbrown1
Oct 15, 2012.
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