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'94 940 hesitation 900

posted by  rjk2 on  Mon Aug 20 04:52 CST 2012
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last visit: Sat Jun 21 05:30 CST 2014
[RELATED]

I've got an electrical gremlin I've been chasing for almost a year.

The car will hesitate on acceleration after a hard stop. The voltage at the coil drops to zero when it hesitates so it does not seem to be fuel related.

I have replaced the power stage twice to no avail. also replaced the MAF.

The CPS was recently replaced.

Idle is not smooth with frequent dips.

Oddly, it seems to hesitate less on a full tank.

It also seems to hesitate more the higher the ambient temp.

What components affect the ignition? What am I missing? Am I chasing multiple problems?
--
1999 E320 1994 F150 1989 560 SL 1986 560 SL (deceased) 1988 300 TE (departed) 1994 945T (daughter's) 1988 244DL (it lives!) 1986 242Ti (fallow) 1968 GT500KR (under restoration)






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