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7 Series - E38 (1995 - 2001)

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  #1  
Old 11-23-2013, 07:12 AM
miguel740i miguel740i is offline
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Mein Auto: 1995 740i
High idle in park/neutral

So this issue has been intermittent since I bought my 95 740i.

I start the car, and it idles pretty normal around 700-rpm. Put it in gear and it drops down to about 600rpm, Put in back park or neutral idle will hover around 1000rpm, sometimes it will settle down to about 800-900 but it goes no lower than that.

OEM bosch maf has about 6k miles on it
Put on new OEM BMW intake boot 1k ago
New 02 sensors that have maybe 200 miles on them, also OEM bosch
Sprayed all vacuum hoses/intake/throttle body with carb cleaner and soapy water hunting for vac leaks. Nothing found

Need to go through emissions soon and I'm sure I'll fail with the idle issue. Any help is appreciated
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  #2  
Old 11-23-2013, 11:18 AM
sigtwenty sigtwenty is online now
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Re: High idle in park/neutral

Iac might be sticky

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  #3  
Old 11-23-2013, 11:44 AM
miguel740i miguel740i is offline
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Carb cleaner it out?
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  #4  
Old 11-23-2013, 11:56 AM
sigtwenty sigtwenty is online now
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Re: High idle in park/neutral

Yea but gently

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  #5  
Old 11-23-2013, 01:36 PM
miguel740i miguel740i is offline
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Cleaned it out, no change. Also ran the car with it unplugged and it didn't like it.
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  #6  
Old 11-23-2013, 02:39 PM
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beemer1804 beemer1804 is offline
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Mein Auto: 95 740IL
Re: High idle in park/neutral

Icv may just need replacing

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  #7  
Old 11-23-2013, 03:30 PM
miguel740i miguel740i is offline
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Ick $200 for one of those...may have to try junkyard. Gonna see about smoke testing the car too and seeing if I have a hidden vac leak
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Old 11-23-2013, 10:10 PM
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Re: High idle in park/neutral

Quote:
Originally Posted by miguel740i View Post
Ick $200 for one of those...may have to try junkyard. Gonna see about smoke testing the car too and seeing if I have a hidden vac leak
I hear you on that!!!!!!!!

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  #9  
Old 11-24-2013, 08:45 AM
miguel740i miguel740i is offline
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So what is the spec voltage for the TPS signal line? should be between .5 to 4.5 volts right? Mine sits at .7v to 4.3v
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  #10  
Old 11-27-2013, 07:10 AM
miguel740i miguel740i is offline
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Update here. Replaced TPS, no change. For laughs I ran the car with the ICV unplugged, the idle was about 100rpm lower but still way too high. Any other suggestions?
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  #11  
Old 11-27-2013, 07:43 AM
ou18 ou18 is offline
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Quote:
Originally Posted by miguel740i View Post
Update here. Replaced TPS, no change. For laughs I ran the car with the ICV unplugged, the idle was about 100rpm lower but still way too high. Any other suggestions?
Okay, i know Im being over simplistic here. But when i started up mine over the weekend, with the exhaust. Mine did the same thing, settle in right around 1K rpm. I gave the throttle plate a push forward and the rpms dropped. I noticed that my bowden cables were to tight and not allowing the plate to rest back to idle position.

I adjusted them and now it settles in right around 700 or so...

Just a thought, could be a sticky bowden cable to your throttle plate....Its worth checking out and doesnt cost you a damn thing, other than a few minutes of time. If thats not it, you didnt waste any money looking at it.
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  #12  
Old 11-27-2013, 07:49 AM
miguel740i miguel740i is offline
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Knowing the "questionable" service history about this car I bet they masked all the vac leaks I found when I bought the car by jacking the idle up. I'll check the throttle cables.
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  #13  
Old 11-27-2013, 08:06 AM
ou18 ou18 is offline
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Quote:
Originally Posted by miguel740i View Post
Knowing the "questionable" service history about this car I bet they masked all the vac leaks I found when I bought the car by jacking the idle up. I'll check the throttle cables.
when you check them, also check to make sure they are routed correctly. On mine, the bowden cable that comes from the driverside fender, is supposed to route across the top of everything, and clip into a little holder on one of the tubes.. If my memory is correct, which it has been suspect. If its not routed that way, i would correct it, as it may have bends in it that could MAYBE be causing the cable to not slide thru its guide..

again, no harm no foul if it isnt it.

found a pic of it
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Last edited by ou18; 11-27-2013 at 08:09 AM.
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  #14  
Old 11-28-2013, 09:30 AM
miguel740i miguel740i is offline
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So a combination of a misadjusted throttle cable and throttle stop was my issue! For those that don't know about the throttle stop screw on the M60/62 with cable throttle here it is circled in red



Car now idles dead on between 500-600 rpm now
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  #15  
Old 11-28-2013, 10:29 AM
ou18 ou18 is offline
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Nice, simple fix, those are always the best kind..
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