Home Technical Discussions BMW E12 5 Series 1972-1981 (528i, 530i, M535i)

BMW E12 5 Series 1972-1981 (528i, 530i, M535i) idle problem


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Last Post: Jun 6, 2008 7:29 AM Last Post By: aototech
Eldernerd

Posts: 1
Registered: 04/10/06
idle problem
Posted: Apr 10, 2006 11:34 PM
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1978 530I, E12 Series with 67,000 actual miles. Purchased new in 1978. Replaced head, pertronix ignition, new ignition wires and replaced auxiliary air valve. Runs good but unable to adjust idle below 1400 when warm. Timing is right on the "ball". Would appreciate any suggestions or ideas.
Charlie

Posts: 4,783
Registered: 12/09/03
Re: idle problem
Posted: Apr 11, 2006 8:39 AM   in response to: Eldernerd in response to: Eldernerd
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Check control pressure. Control pressure regulator out of adjustment? Sticking plunger in fuel distibutor or even air sensor out of adjustment or sticking. the Bosch fuel injection book is great for your car. Do you own it?

http://www.bentleypublishers.com/product.htm?code=gfib
porkface

Posts: 152
Registered: 01/06/04
Re: idle problem
Posted: Apr 11, 2006 1:34 PM   in response to: Charlie in response to: Charlie
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charlie-the 530s are l-jet, not kjet. only the 320s were kjet. sorry to bust you in the open-don't know how to do it privately.

as far as the idle problem, i'd look at the intake boot-any cracks will behind the airflow meter will raise the idle. also, make sure the aux air valve is closed when the car is warm if it's open, then check the harness for 12 volts with the key on-that powers the heater in the aux valve. there's also an ac idle compensator on the car. maybe it's on with the ac off? good luck, chuck.

Charlie

Posts: 4,783
Registered: 12/09/03
Re: idle problem
Posted: Apr 11, 2006 1:44 PM   in response to: porkface in response to: porkface
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Oops. No problem, sorry about that. I think I may have misread something, thought it was a 4-banger.
erniecee

Posts: 45
Registered: 09/08/04
Re: idle problem
Posted: Apr 13, 2006 11:41 AM   in response to: Charlie in response to: Charlie
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Oops. No problem, sorry about that. I think I may
have misread something, thought it was a 4-banger.

re: link provided with above message to bosch book for fuel injection etal. does book cove my 1995 530i with M60 engine ?????
Charlie

Posts: 4,783
Registered: 12/09/03
Re: idle problem
Posted: Apr 13, 2006 11:45 AM   in response to: erniecee in response to: erniecee
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Its a great book in a lot of ways, but I think its not up to date when it come to late Motronic DME systems. You would learn a lot I think, I do like all the theroy in the book.
aototech

Posts: 3
Registered: 05/23/08
Re: idle problem
Posted: Jun 6, 2008 7:29 AM   in response to: Eldernerd in response to: Eldernerd
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