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99 Suburban motor hesitates after warm

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Jim
 
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Default 99 Suburban motor hesitates after warm - 06-09-2008 , 07:49 PM






I installed a new fuel filter. It starts good and runs fine until
warmed up, then it hesitates on light accelleration. If you jump on it
it goes fine. At idle it runs smooth when cold, then "jumpy" when warm
and hesitates a bit when starting out. Since it uses more fuel until
warmed up, I would think that the fuel pump is working fine. Not sure
where to look next.

Jim

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Shep
 
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Default Re: 99 Suburban motor hesitates after warm - 06-11-2008 , 07:57 AM






A full scan should be done to look at sensor inputs, especially the o'2
sensor.
"Jim" <jameswcrouch (AT) juno (DOT) com> wrote

Quote:
I installed a new fuel filter. It starts good and runs fine until
warmed up, then it hesitates on light accelleration. If you jump on it
it goes fine. At idle it runs smooth when cold, then "jumpy" when warm
and hesitates a bit when starting out. Since it uses more fuel until
warmed up, I would think that the fuel pump is working fine. Not sure
where to look next.

Jim



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