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'89 740 GL Cold Start Problem 700

posted by  WallyM on  Sat Feb 28 11:54 CST 2004
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last visit: Fri Apr 11 13:12 CST 2014
[RELATED]

Chuck,

I performed the tests you recommended today. Unfortunately the car started every time I tried. I did the tests anyhow. At the injectors, with the car running, I got 460-520 mv - this seems OK. Spark looked OK but I replaced the plugs as a precaution. When I pulled the ect connector, turned the key to position II and measured the voltage it was 8.43 volts. Same reading between green/white wire and white wire as between green/white wire and ground. Voltage was higher than 5 volts. Is this a problem?

Reading at the ect switch was 2410 ohms, air temperature was in the high 40s, coolant temp probably a little higher because the car had be running for about a minute when I did the fuel injector test perhaps 20 minutes earlier.

Checked the ground connection - they seemed OK.

I'm not sure if these tests are meaningful when the car starts - I would rather it had failed to start today but it didn't.

Two concerns - the 8.43 volts at the ect connector and the validity of the tests when car started.

My wife tells me she used the car late yesterday afternoon to do some errands. When she returned home she parked in the driveway for 30 minutes and had trouble starting it when she attempted to move it into the garage. After stepping on the gas the car started. This is the only instance of a warm start failure I'm aware of.

Thanks for your help.

Wally





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