TPI Cold Off Idle Stumble

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08-28-2003, 04:17 PM

Ranbo108

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Location: Glen Burnie, MD

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Car: '85 Z28 TPI

Engine: 305 F vin

Transmission: 700

Axle/Gears: 3.23 posi 10 bolt

TPI Cold Off Idle Stumble

I am new to TPI. My '85 Z-28 has a bad stumble off idle when cold, even when I'm gentle. Once warmed it runs great. 180K easy miles with mostly original parts. Is this a well known or common problem or maybe a combo of issues? any thoughts?
Thanks, Randy

Last edited by Ranbo108; 08-28-2003 at 04:40 PM.

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08-29-2003, 07:52 AM

Vader

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Some throttle tip-in hesitation is to be expected, but it should almost be unnoticable. Things that will exaggerate the hesitation are a low TPS voltage setting, a throttle minimum air position setting that is too low, low fuel pressure, external vacuum leaks, a sticking or leaking EGR valve, sticking PCV valve, or base timing setting too retarded.