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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 07-21-2008, 06:11 AM   #1 (permalink)
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Weird Problem!

Hey everybody, i've got a 1992 325i and i installed a new idle control valve recently, and i think the car has a high idle... its around 1200RPM !! the problem is that if i turned on the engine and let the car run for a while or if i put the car in neutral while i was in a traffic light, the check engine and the transmission lights come on (the small yellow gear with an exclamation mark inside it) and when i try to take off for example the car will be too slow as if im not on first gear or something!!!! and when i shut the engine off for like 20 secs and turn it back on, that thing disappears!!! do you know what the problem might be probably???!!
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Old 07-21-2008, 11:48 AM   #2 (permalink)
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If you have a Bentley Service Manual, go to page 130-20 in the fuel injection section....
It has a series of tests to perform to help you find the problem.....if you don't, it will be one of your most important purchases for your vehicle.... you'll need to correct that idle condition, also you need to have the check engine code or codes read. You can either purchase a obd I scanner or just bring it to an Autozone or Advanced Autoparts store & they can read them....for this will help in pinpointing the problem.....
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Old 07-21-2008, 08:12 PM   #3 (permalink)
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sounds to me like a TPS problem... or idle screw "in" too way deep. OR, thermo time switch gone bad.

but yes, to be sure, take Johnny's advise. the CEL is there for a reason and it is to help diagnose what might be wrong with ur engine & to engine problems to us humans in a language that we all understand ;-)
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Old 07-21-2008, 10:11 PM   #4 (permalink)
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hey guys, well the problem was caused by the TB sensor which makes sense !!! i also had to change the boot of the mass airflow cause it ws kinda cracked! but i guess TB sensor was the main reason!! the idle now is at 1000 RPM or maybe 900RPM... isnt that a little bit higher than its supposed to be??!

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Old 07-23-2008, 09:33 AM   #5 (permalink)
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TB sensor??.. what is that?

900 RPM would be correct with A/C on. And that will we 250RPM's too high tho' with A/C off.
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