Posted on Sep 13, 2009

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Problem bad hesitation when cold

I have a 1997 Chevy ½ ton 4x4 with 500k 5.0 vortec

Problem bad hesitation when cold when you step on the gas as it warms up the hesitation is less but still there. It uses a lot of gas, it start and idles fine. Failed just about everything on an etest expt the gas cap.

What I have done plugs, wires, cap, rotor, cleaned the inside the intake and the throttle body, replaced the Cat, had it on the computer and bank one good (oxygen sensor) bank 2 was good but one oxygen sensor was not fluctuating (that is why I change the cat as well as well as the readings from the Etest). I also cleaned the inlets on the oxygen sensors.
I have another etest scheduled now that I have change the cat.
Any thoughts would help
Pete

1 Answer

Anonymous

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Posted on Sep 13, 2009

Anonymous

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You should change all 4 O2 sensors, it will run better :)

Also check your compression. Not enough compression on any one cylinder will cause oil blow-by and cause it to fail emissions. Also, the EGR valve can cause the same symptoms.

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