87 635 - Cold Start Problem

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Kaylix
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Joined: Sat Apr 09, 2016 5:51 am
Location: New York

87 635 - Cold Start Problem

Post by Kaylix »

Guys - I went away for 3 months and had to leave my car outdoors in a very shaded area on a battery tender. When I returned to start her up, the engine turns over but won't idle. I have to depress the accelerator a fair amount to keep the engine running.
Previously, last summer, I was having a problem of stalling in extremely hot weather idling at a red light. But never a problem in cold weather.
Any ideas would be appreciated!
'87 635CSi Delphin
'88 MB 560SL Cosmic Blue
'97 MB S500
'99 MB SL500
'01 Ford F150

Not forgotten
'83 633, '84 730, '85 735, '89 635, '95 525iT, '97 Z3, '00 740i Sport, '01 '330ci, '00 540iT
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miklilmag
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Re: 87 635 - Cold Start Problem

Post by miklilmag »

hello, doing some investigating troubleshooting, keep
it simple, unmeasured air, vacuum leak, hose cracked or broken,.....or, fuel filter clogged,fuel pump kaput (pick up sock/screen clogged), fuel pressure regulator, or... ecu wet/moist, distributor cab/ rotor, wishing you good luck, keep us posted, Franke
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Bhart
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Re: 87 635 - Cold Start Problem

Post by Bhart »

One other possible issue - idle control valve sticking.
01/1987 M6

past Bimmers;
1970 2800CS
1988 325is
1985 325E
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hornhospital
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Re: 87 635 - Cold Start Problem

Post by hornhospital »

Bhart wrote: Mon Aug 05, 2019 5:21 pm One other possible issue - idle control valve sticking.
This ^^^^^^
It's directly related to the period of inactivity. Sticks because it's dried out.
Ken Kanne
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
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Kaylix
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Joined: Sat Apr 09, 2016 5:51 am
Location: New York

Re: 87 635 - Cold Start Problem

Post by Kaylix »

Hey guys - thanks for the great info. It's a beautiful day to work on my 6 :)
I'll keep you posted.
'87 635CSi Delphin
'88 MB 560SL Cosmic Blue
'97 MB S500
'99 MB SL500
'01 Ford F150

Not forgotten
'83 633, '84 730, '85 735, '89 635, '95 525iT, '97 Z3, '00 740i Sport, '01 '330ci, '00 540iT
User avatar
Kaylix
Posts: 15
Joined: Sat Apr 09, 2016 5:51 am
Location: New York

Re: 87 635 - Cold Start Problem

Post by Kaylix »

Idle Control Valve was the problem. Thanks for the help!!
'87 635CSi Delphin
'88 MB 560SL Cosmic Blue
'97 MB S500
'99 MB SL500
'01 Ford F150

Not forgotten
'83 633, '84 730, '85 735, '89 635, '95 525iT, '97 Z3, '00 740i Sport, '01 '330ci, '00 540iT
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