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Engine miss in wet weather 700 1991

posted by  someone claiming to be ibs740 on  Tue Dec 12 02:06 CST 2006 [RELATED]

Hi,

A problem just surfaced recently, I hope people can shed some light on.

1991 740 turbo wagon, M46,Bosch ign. system w/ crank speed sensor.

Problem started as a misfire (not bad just annoying). I replaced the Cap & rotor as they were due. Problem was fixed for a couple of days. The miss came back. This is the wife's car so I swapped to record problem.

The miss is as if one cylinder skips a firing cycle then starts working.
Miss is not continous just happens throughout any drive.

Plugs are Bosch Platinum 5000 km.
Wires Bougicord 25000 km
Injectors cleaned w/ garage type OTC pressure cleaner 2000 km ago
All electrical connections clean & lubed
Throttle body cleaned 10000 km
Coil is same that came w/ the car 70,000 km ago

It idles fine no missing in wet or dry.
In wet weather around 32F miss is worse, happens in all throttle positions but less under heavy accleration.
In dry weather at same temperature under similiar throttle positions I could just bearly detect the smallest miss, no where near as bad as wet weather.

Cheers IBS740





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