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Registered User
Join Date: Oct 2011
Posts: 4
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1990 325i no fast idle
so when i fire up my car first thing in the morning there is no cold idle what so ever, it starts right up, revs to about 1400rpms then drops to about 600 and stays there. its been doing this ever since i got the car and replaced the cylinder head from a burnt valve.
ive ohm'ed the ICV and it checks fine and the CTS looks newer as well as its connector. any idea's would be GREATLY appreciated. |
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10-20-2011, 02:37 PM
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Registered
Join Date: Sep 2005
Location: Sacramento CA
Posts: 1,147
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There should be a temperature sensor in the head that tells the fuel injection system the temperature of the head. My guess is that it is always reporting that the head is warm.
There are two temperature sensors on the intake side of the head toward the front. Sorry, but I don't know which one talks to the fuel injection system. |
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10-20-2011, 10:03 PM
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Join Date: Oct 2011
Posts: 4
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i know the single pin is for the gauge cluster and the dual pin with the blue connector is for the fuel injection system. problem being is that someone replaced the connector and sensor some time in the past and i don't know if they hooked the proper wires together or not, or just that the sensor is bad.
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10-21-2011, 09:01 AM
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Registered
Join Date: Oct 2005
Location: Florida
Posts: 668
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If you have a Haynes, or better a Bently manual, the ECM pin assignments are in it.
You can remove the plug and chase it down from there with a digital VOM.
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74 911 targa blk on blk, Carrera fend., tires & whls. gone, missed 85 325e bought new, totaled after 20 years & 465K miles, trouble free service. 01 Ford Ranger 4dr stpsd 4wd. I drive,here 88 325i convert. only 98k miles,gone, sold 93 325i.here, 98 Z-3 roadster. gone, 08 128 cabro gone |
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10-21-2011, 05:12 PM
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Join Date: Oct 2011
Posts: 4
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i have the circuit diagrams i printed off at work, my co-works and myself have been goofing around with this in the down time at work but alldata doesn't have all that much info on testing which sucks.
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10-21-2011, 07:40 PM
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Registered
Join Date: Oct 2005
Location: Florida
Posts: 668
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Do you have access to a digital volt/ohm meter? Unplug the ecm, read the resistance between the two pins on the ecm plug that corespond to the sensor you are in question about. unplug the sensor, if the resistance at the pins you are reading do not go to infinity when you take the sensor out of the circuit, you have eliminated one. go to the next one, and the next, note the results each time as you go. you will figure what plug is what by going to the source.
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74 911 targa blk on blk, Carrera fend., tires & whls. gone, missed 85 325e bought new, totaled after 20 years & 465K miles, trouble free service. 01 Ford Ranger 4dr stpsd 4wd. I drive,here 88 325i convert. only 98k miles,gone, sold 93 325i.here, 98 Z-3 roadster. gone, 08 128 cabro gone |
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10-21-2011, 11:47 PM
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Registered User
Join Date: Oct 2011
Posts: 4
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i do and we have tried that to no avail
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10-22-2011, 05:41 PM
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