engine rough running low to midrange rpm
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engine rough running low to midrange rpm
1992 305c.i. TPI installed new fuel pump idle OK...High RPM good under acceleration, but Major bogging down i. e. fuel starvation at majority of midrange RPM. Please help! DP
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Joined: Jul 1999
Posts: 1,556
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From: Adrian, Mi, USA
Car: 1988 Pontiac Firebird Formula
Engine: 5.7 TPI
Transmission: 700R4
Re: engine rough running low to midrange rpm
How old are your O2 sensors? Might try unplugging it, and see if the problem goes away.
Supreme Member
Joined: Jan 2004
Posts: 2,322
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From: So. Ohio
Car: 88 Camaro
Engine: L98 350
Transmission: 700r4
Re: engine rough running low to midrange rpm
Was this the original TPI? Some of the earlier units had injectors that today's gas will mess up and then cause poor light acceleration and cruising smoothness due to lean out.
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Junior Member
Joined: Jun 2017
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Re: engine rough running low to midrange rpm
Thanks....All TPI injectors were replaced 3000 miles ago. Worked great until fuel pump went bad and was replaced OEM. Nothing but fuel starvation like symptoms ever since!
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