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| E21, E30 General discussion and technical help for 1975-1991 3 series cars. |
10-16-2007, 01:34 PM
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#1
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Name: mzbmw325i
Title: Member
Status: Offline
Join Date: Jan 2007
User not setup in Rate My Car. Click here to set it up.
Your Ride: 1991 325i; 1988 325is
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High rpm's at idle
Hi,
On my 88 E30 325is, the rpm during idle stays around 1k. the guy that sold me the car said he replaced the ODB and told me the rpm is fine. i do see it on the receipts that it was replaced but it still bothers me that it shows rpm at 1k
i cleaned the ICV valve, spark plugs are new, no vacuum leaks that i know of.Hoses are new.
any ideas, could it be the ECU, TCP or really the board reads the rpm high/wrong, how can i test it? thanks
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10-16-2007, 04:41 PM
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#2
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Name: elsabor67
Title: Senior Member
Status: Offline
Join Date: Oct 2006
Location: Germany ('Till 2010)
Your Ride: 1989 325i (U.S. Specs)
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From experience (just went thru this) I would recommend that you find the same ecu for your car(last numbers 153 or 173). Connect the test ecu and if your rpm's drop to normal, swap your ecu. That was the way I found out mine was bad. Before you do that check your vaccum lines and lines. Good luck.
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10-17-2007, 01:08 AM
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#3
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Name: mzbmw325i
Title: Member
Status: Offline
Join Date: Jan 2007
User not setup in Rate My Car. Click here to set it up.
Your Ride: 1991 325i; 1988 325is
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Quote:
Originally Posted by elsabor67
From experience (just went thru this) I would recommend that you find the same ecu for your car(last numbers 153 or 173). Connect the test ecu and if your rpm's drop to normal, swap your ecu. That was the way I found out mine was bad. Before you do that check your vaccum lines and lines. Good luck.
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where did you get the last numbers 153 or 173. under what year E30 did you see it?
like i said hoses look fine, i have a little oil leak from my valve cover gasket, i don't know how much can that contribute to the high rpm.
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10-17-2007, 02:24 PM
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#4
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Name: elsabor67
Title: Senior Member
Status: Offline
Join Date: Oct 2006
Location: Germany ('Till 2010)
Your Ride: 1989 325i (U.S. Specs)
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[quote=mzbmw325i;154011]where did you get the last numbers 153 or 173. under what year E30 did you see it?[quote]
The numbers i mentioned are the last 3 numbers on your ecu. I got it from a search I did and it landed me on a bimmerboard forum page. I sent you a PM with all the ECU numbers that apply for BMW 325i from 87-91. The oil leaks should not affect your rpm's. If you need anymore help you can shoot me a PM and let me know.
__________________
 How do I spell relief??
 AUTOBAHNNNNNNNNN 
"GO FASTER  !!"
Last edited by elsabor67 : 10-17-2007 at 02:29 PM.
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10-19-2007, 12:59 PM
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#5
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Name: jcjdavis1
Title: United Newb
Status: Offline
Join Date: Oct 2007
Location: Paisley Scotland
User not setup in Rate My Car. Click here to set it up.
Your Ride: 1989 320i tourer
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Hi Slacken off small nut then wind back large knurled screw using plumbers grips to hold cable and that might lower idle speed.It worked for me.

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10-22-2007, 09:52 PM
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#6
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Name: mzbmw325i
Title: Member
Status: Offline
Join Date: Jan 2007
User not setup in Rate My Car. Click here to set it up.
Your Ride: 1991 325i; 1988 325is
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i did the stomp test tonight and i got no reading back, the check engine light did not blink once. what does that mean?
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10-22-2007, 10:27 PM
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#7
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Name: celsdogg
Title: never gonna happen
Status: Offline
Join Date: May 2005
Location: MD
Your Ride: BMW E30, Subaru BE, Cannondale M400
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^^^ i believe that means that your not throwing a code. but the obd1 isnt as sophisticated as obd2.
__________________
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12-10-2007, 02:46 PM
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#8
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Name: mzbmw325i
Title: Member
Status: Offline
Join Date: Jan 2007
User not setup in Rate My Car. Click here to set it up.
Your Ride: 1991 325i; 1988 325is
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ok, i still have the issue with high idle. i checked all hoses, replaced ECU, tested ICU valve, all good as far as i know.
i am thinking to check the TSP switch, is it possible if that is shot that may cause the high idle. Maybe also the AMF.
where can i find out at what rpm the auto tranny is supposed to shift gears. currently my 4th gear shifts at 50 mph/ 3k rpm, i think it has to do with my high idle or something.
thanks
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12-10-2007, 03:26 PM
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#9
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Name: Exilion
Title: Senior Member
Status: Offline
Join Date: Oct 2006
Location: World wide
User not setup in Rate My Car. Click here to set it up.
Your Ride: 1991 325i
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Quote:
Originally Posted by jcjdavis1
Hi Slacken off small nut then wind back large knurled screw using plumbers grips to hold cable and that might lower idle speed.It worked for me.

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Actually that worked for me. I've heard sometimes it doesn't help though but I think that's only when your idle speed is jumping around. Basically it'll adjust the default position of the throttle valve.
__________________
BMW's are made by god... kinda
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12-10-2007, 04:16 PM
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#10
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Name: mzbmw325i
Title: Member
Status: Offline
Join Date: Jan 2007
User not setup in Rate My Car. Click here to set it up.
Your Ride: 1991 325i; 1988 325is
|
Quote:
Originally Posted by jcjdavis1
Hi Slacken off small nut then wind back large knurled screw using plumbers grips to hold cable and that might lower idle speed.It worked for me.

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My idle is steady at 1k, can't see the picture, can someone show a pic with the nut in question. thanks.
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12-10-2007, 04:57 PM
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#11
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Name: elsabor67
Title: Senior Member
Status: Offline
Join Date: Oct 2006
Location: Germany ('Till 2010)
Your Ride: 1989 325i (U.S. Specs)
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My advice, I wouldn't do any adjustment to the throttle cable. Just my 2 cents.
Get a bentleys manual and do the current adn electrcial checks for the TPS. Also, Check your MAF sensor too just in case. Also, if your check engine light isn't coming on at all (even when you turn the key to start the car) then you bulb might be out.
__________________
 How do I spell relief??
 AUTOBAHNNNNNNNNN 
"GO FASTER  !!"
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12-10-2007, 04:57 PM
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#12
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Name: Exilion
Title: Senior Member
Status: Offline
Join Date: Oct 2006
Location: World wide
User not setup in Rate My Car. Click here to set it up.
Your Ride: 1991 325i
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hmmm... I can describe it for now. You'll see a cable coming to the intake manifold. At the end of this cable is a bolt that you can either tighten or loosen with a slot screw driver which in turn increases or decreases the engine idle speed. That's all I adjusted for mine, although I don't know if this will be a definite fix for you. Then again it's simple to undo so whatever go for it.
__________________
BMW's are made by god... kinda
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12-29-2007, 02:42 PM
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#13
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Name: player2poet
Title: Member
Status: Offline
Join Date: Sep 2007
User not setup in Rate My Car. Click here to set it up.
Your Ride: 1985 bmw 325
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hey did your issue with the idle ever get resovled im having the same damn problem now idles at 1k replaced icv, idle control brain little green box next to ecu ,new intake boot,checked tps seems to be working ,adjusted all i could made run at seven hundred rpms but it searches the whole time at idle but as soon as i drive it the stinkn idle goes right back to 1k what the hell thing ran fine a week ago ,any ideas?
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12-29-2007, 11:29 PM
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#14
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Name: mzbmw325i
Title: Member
Status: Offline
Join Date: Jan 2007
User not setup in Rate My Car. Click here to set it up.
Your Ride: 1991 325i; 1988 325is
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no, i have not and is bugging the hell out of me, i unplugged the ICV while the car was running today and the rpm did not even move, so i assume maybe the ICV is shot, i am going to the junk yards to scavenge one and go from there.
i know i don't have a vacuum leak so i am going to start with the ICV and go from there.
Last edited by mzbmw325i : 12-29-2007 at 11:30 PM.
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12-30-2007, 01:01 AM
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#15
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Name: kenika65
Title: United Newb
Status: Offline
Join Date: Mar 2007
Location: TEXAS
User not setup in Rate My Car. Click here to set it up.
Your Ride: 91 m42, 86 2.7i, 89i parts car
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Sounds like a vacuumed problem or your ICV, AFM, ECU, FPR, TPC... well you get the picture.
Try this out.
http://opel-scan.ru/files/DME_1.1_1.3.pdf
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12-30-2007, 04:57 AM
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#16
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Name: jcjdavis1
Title: United Newb
Status: Offline
Join Date: Oct 2007
Location: Paisley Scotland
User not setup in Rate My Car. Click here to set it up.
Your Ride: 1989 320i tourer
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Hi.Another good site to get help is http://www.e30zone.net/index.php.
__________________
The older I get the wrong bits get stiff!!!
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01-02-2008, 06:49 PM
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#17
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Name: player2poet
Title: Member
Status: Offline
Join Date: Sep 2007
User not setup in Rate My Car. Click here to set it up.
Your Ride: 1985 bmw 325
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stainless still headers and three inch exhast bad low idle?
as you know i have been having problems getting my car to idle at 700 to 800 rpm's .the rpm's jump up and down from 500 to 1200 rpms at idle bad jumping now at cold temp searches and settles at 1k to 1100 k at warm temp. replaced f,p,r .icv,the intire throttle body with tps,new intake boot ,new vacumm hoses,idle control brain green box next to ecu ,now for my question i have stainless steel headers with a three inch exhast and three inch cat that goes striaght back into a magnaflow exhast .my question is that do you think that this might be tied to my car only wanting to idle at 1k to 1,100 k before the idle will even out and steady.i was thinking maybe i dint have the proper back pressure to keep it running at low rpm's and maybe the ecu is trying to even out my idle at low rpm's and cant hence the jumping up and down at cold and settling at 1k or more at fully warm .just a thought if it sounds crazy or it aint even possible let me know your thoughts just running out ideas on this idle issue .dont want to keep poring money into it just to have the idle still being a ass! thanks 
Last edited by player2poet : 01-02-2008 at 06:54 PM.
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01-03-2008, 02:17 AM
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#18
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Name: elsabor67
Title: Senior Member
Status: Offline
Join Date: Oct 2006
Location: Germany ('Till 2010)
Your Ride: 1989 325i (U.S. Specs)
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IDT that your exhaust change can cause that. I still think that it might be a vaccum line or a breather line. Have you also checked your MAF sensor? My idle was being stupid a while back and traced it down to 2 things, my MAF and the TPS.
__________________
 How do I spell relief??
 AUTOBAHNNNNNNNNN 
"GO FASTER  !!"
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01-03-2008, 01:01 PM
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#19
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Name: player2poet
Title: Member
Status: Offline
Join Date: Sep 2007
User not setup in Rate My Car. Click here to set it up.
Your Ride: 1985 bmw 325
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elsa msd is on its way sorry took so long famley has been real buzy during holidays .thanks for the help
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01-04-2008, 09:10 AM
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#20
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Name: bigtom21485
Title: United Newb
Status: Offline
Join Date: Oct 2007
User not setup in Rate My Car. Click here to set it up.
Your Ride: 99 328iC
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what is the psd and is it exclusive to the e30? I'm having the same problem with my e36. Today going to clean fuel filter & ICV.
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