engine miss

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Mar 31, 2007 | 01:37 PM

cpettymore7777

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engine miss

98 expy 4.6. when crusing with no load i feel a miss in the engine. if a floor it it dont miss a beat. just seems without a load and under 2200 rpms. i had no codes. fuel pump and filter, mass air flow sensor and plugs are new. im out of ideas.

Mar 31, 2007 | 08:12 PM

ubereal2

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From: Lexington Mo

Have you given the TPS (throttle position sensor) a try?
It can give a miss in a given position in the throttle. Maybe one speed and not another.

Apr 1, 2007 | 07:56 AM

cpettymore7777

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thanks, i will giver er a shot.

Apr 3, 2007 | 11:04 AM

Darth Baiter

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From: Jersey Shore on the Right

Plug wires shorting out? I had an issue with my 99 4.6 returning from a long winter trip in wet weather. Felt like I lost a cylinder, no codes, buck like mad under 2000 RPM but run much better with the OD off and RPM's at 2500 or 3000. Cleared itself on the way home. CEL flashed a few times but threw no codes. Took the local mechanic 2 visits to get it to miss. New plugs and wires (85K) and all's well again. I know you did plugs, how about wires?