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Old 06-01-2001, 09:36 AM
aldedmon's Avatar
Senior Member
Join Date: Mar 2001
Location: Houston
Posts: 809
I recently changed out the Wires,Rotors and Dist.caps on my 92 400e. Its been a week and now when I start it first thing in the AM, it misses and sputters a bit when I take off. After it warms up, its as smooth as silk. I'm gonna do the plugs this weekend,as well as recheck all the connections. Am I missing something?

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Old 06-01-2001, 11:26 AM
JimF's Avatar
'94 S500: only 793 sold!
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,925

Also check the ECT sensor. If it has drifted (changed value, a common failure mode), then it tells the cars computer to use a too lean mixture when cold. Thus it runs roughly until it warms.

Mine ECT is a four terminal device (black) mounted on the front of the engine. Here's what the manual says for the ECT's temp (deg C) vs resistance. Pull of the top and use an ohmmeter to measure the resistance between adjacent terminals. Readings should be no more than +/-5% from those below. If so replace the sensor.

Temp(C)-Temp(F)---- Ohms
20 -------- 68 ----------- 2500
30 -------- 86 ----------- 1700
40 ---------104 ---------- 1170
50 ---------122 ----------- 830
60 ---------140 ----------- 600
70 ---------158 ----------- 435
80 ---------176 ----------- 325
90 ---------194 ----------- 245
100---------212 ----------- 185
Regards . . . . JimF
'94 S500 Cpe

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