vortec 350 with tbi heasitates on accel cold please help

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Aug 15, 2003 | 07:36 PM

carzykev

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From: wisconsin

vortec 350 with tbi heasitates on accel cold please help

i have an 350 vortec with tbi. headers and dual exhaust . under accel cold it hesitates and runs rough . when its warm it runs awsome . any clues on how to fix the cold running prob ? please help. i installed a heated o2 sensor too

Kevin

Aug 15, 2003 | 07:37 PM

carzykev

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Junior Member

Joined: Aug 2003

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From: wisconsin

tbi hesitates on accel

its also in a 89 rs

Aug 15, 2003 | 07:59 PM

RBob

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From: Chasing Electrons

Car: check

Engine: check

Transmission: check

Re: vortec 350 with tbi heasitates on accel cold please help

Quote:

Originally posted by carzykev
i have an 350 vortec with tbi. headers and dual exhaust . under accel cold it hesitates and runs rough . when its warm it runs awsome . any clues on how to fix the cold running prob ? please help. i installed a heated o2 sensor too

Kevin

Sounds like it is time to get into the ECM and do some tuning. The DIY PROM board on this site is a great resource. Did you happen to change the injectors over to the larger 350 engine injectors from the 305 injectors?

RBob.