NO POWER WHEN COLD

1999 GMC

Tiny

paylone20

September, 27, 2009 AT 3:47 PM

Engine Mechanical problem
1999 Other GMC Models V8 Four Wheel Drive Automatic 136000 miles

when engine is cold it runs real rough. No power back fires. When warm runs better but not full power. I have changed mass air senser, egr valve throttle position senser plugs wires, checked pressure in cats and fuel pressure is good, and I changed fuel filter can u please help

FOUND 1053 RELATED QUESTIONS

6 Answers

Tiny

Docfixit

September, 27, 2009 AT 4:13 PM

Hi
Have you checked for codes? What is engine compression? Assume all the parts replaced made no difference? Any backfiring? Loss of fuel milage?
Let me know
Thanks for donate

Tiny

paylone20

September, 27, 2009 AT 4:26 PM

Yes I have checked for codes no codes. And have had it hooked to computer when it is doing it. Could u give me anything else.

Tiny

Docfixit

September, 27, 2009 AT 4:37 PM

Would you answer all questions please need all info I can get to help

Tiny

paylone20

September, 27, 2009 AT 10:45 PM

Yes I have had a compression test done on it. What other info do u need to no. I have tried everything that I could think of please help

Tiny

paylone20

September, 27, 2009 AT 11:44 PM

Yes it also backfires and fuel milege is below par for sure.

Tiny

Docfixit

September, 28, 2009 AT 8:52 AM

Ohm check two sensors the Engine coolant temp and Air intake temp sensor. The ECT is next to thermostat and IAT in air intake. They should ohm out at 86 degrees- 2238 ohms, 104 degrees-1459 ohms, 212 degrees- 177ohms.

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