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E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 12-05-2012, 02:39 PM
WickedFast.Inc WickedFast.Inc is offline
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Idle man idle just idle man

So i had an L shaped idle motor (wrong one for my car) it had a jumpy idle from the day i got it and if in park or neutral my car would I would 2000 rpm I bought a new motor and put it on in now when I start my car off it immediately goes puuuut and dies the only way i can seem to get it to idle is to adjust the screw on the monifold (a no no i am aware of ) otherwise it just kills over i am going to put the old one on because it ag least ran but do you have any ideas? And where is my tps


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  #2  
Old 12-05-2012, 02:58 PM
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hornhospital hornhospital is offline
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Your tps is on the t. (throttle) Kinda obvious, isn't it?
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  #3  
Old 12-05-2012, 03:15 PM
WickedFast.Inc WickedFast.Inc is offline
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Well that's what I was thinking but i didnt realize it was on the bottom i found it right after i posted. That said do you have any ideas? I was thinking my tps might be bad the tps tells my idle motor how far to open right?

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  #4  
Old 12-05-2012, 03:42 PM
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hornhospital hornhospital is offline
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The TPS only tells the ECU if the throttle is open or closed. Follow this to test it:
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Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
BMW-CCA #441426
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?

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  #5  
Old 12-05-2012, 05:04 PM
WickedFast.Inc WickedFast.Inc is offline
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Is that out of a bently manual? And why would my new idle motor not open? And if erratic idle is a syptom i may have a problem. When i stop the rpms wil jump from 750 to 1000 for a few and if i am at a long light it will eventually drop to 500 to 750 and so on until it is barely staying running it has only died from this once

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  #6  
Old 12-05-2012, 07:31 PM
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hornhospital hornhospital is offline
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At 500 rpm it should idle smoothly even if that is a little low. Yes, those are pages from the E30 Bentley Manual. You REALLY need to get one. Erratic idle is almost always vacuum- leak related.
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BMW-CCA #441426
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?

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  #7  
Old 12-06-2012, 02:15 AM
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Nick323 Nick323 is offline
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Question TPS with built in Potentiometer

While we're at the TPS
Is there a TPS that will fit in the place of this E30 B20 unit that measures actual throttle position ? Like all civilised vehicles

Oh yes, to get back to your problem. If the TPS does not see a closed throttle it cannot tell the idle motor to adjust the idle
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Last edited by Nick323; 12-06-2012 at 02:17 AM.
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  #8  
Old 12-06-2012, 07:24 AM
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Quote:
Originally Posted by Nick323 View Post
If the TPS does not see a closed throttle it cannot tell the idle motor to adjust the idle
^This exactly. It's an on or off switch, not a variable rheostat like the AFM.
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BMW-CCA #441426
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?

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  #9  
Old 12-07-2012, 08:18 AM
WickedFast.Inc WickedFast.Inc is offline
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And from what you showed me HH, it should read no resistance when closed right?

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  #10  
Old 12-07-2012, 09:59 AM
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hornhospital hornhospital is offline
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Correct. Continuity means zero resistance. 0 ohms. It's really two switches in one housing. It tells the ECU it's either a closed throttle with one switch, or a wide open throttle with the other. In between (throttle part-way open) it should have infinite resistance between the center contact and either of the outside ones. When the throttle is closed, the idle side turns on the idle control valve (through the ECU). If the TPS is bad or adjusted incorrectly, the ICV can't regulate the idle.
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Quotes to live by:
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Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
BMW-CCA #441426
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?


Last edited by hornhospital; 12-07-2012 at 10:09 AM.
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  #11  
Old 12-08-2012, 09:27 AM
WickedFast.Inc WickedFast.Inc is offline
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I get infinite resistance closed and all the way open but in between i get resistance

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  #12  
Old 12-08-2012, 03:09 PM
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hornhospital hornhospital is offline
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That is completely backwards from what it's supposed to be. You should have continuity (zero ohms resistance) between pins 2 and 18 with the throttle closed, and continuity between 3 and 18 with it wide open, and that's all.
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BMW-CCA #441426
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?

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  #13  
Old 12-08-2012, 04:03 PM
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woodenbmw woodenbmw is offline
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Quote:
Originally Posted by hornhospital View Post
At 500 rpm it should idle smoothly even if that is a little low.
What is the normal idle speed ? Mine will idle at just under 1000 rpm in park, but drops to about 650 rpm when I put it in gear.
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  #14  
Old 12-08-2012, 07:38 PM
WickedFast.Inc WickedFast.Inc is offline
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500-600 told she should sound nice and purrty

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  #15  
Old 12-08-2012, 08:43 PM
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woodenbmw woodenbmw is offline
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Any idea on the drop in idle speed when put into gear ?
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  #16  
Old 12-08-2012, 09:10 PM
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hornhospital hornhospital is offline
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Wooden, is it an automatic? If so, that's normal, since the torque converter loads against the engine.

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Quotes to live by:
guessing gets expensive...drivinfaster
nothing is more expensive than a cheap BMW...c4harpe13

Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
BMW-CCA #441426
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?

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  #17  
Old 12-08-2012, 09:36 PM
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woodenbmw woodenbmw is offline
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Hh, it is an automatic. I suppose that would explain it. So, does that mean I should idle faster in park ? Or should the idle still be in the 500 - 600 range while in park ?
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  #18  
Old 12-08-2012, 09:40 PM
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hornhospital hornhospital is offline
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It'll idle a little higher in park or neutral since there's no load. Perfectly normal.
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Quotes to live by:
guessing gets expensive...drivinfaster
nothing is more expensive than a cheap BMW...c4harpe13

Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
BMW-CCA #441426
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?

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  #19  
Old 12-08-2012, 10:17 PM
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woodenbmw woodenbmw is offline
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I'll shoot for the 700 - 800 range then. Thanks for the info. Am I supposed to set the idle using the set screw on the ICV ?
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  #20  
Old 12-09-2012, 12:28 AM
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hornhospital hornhospital is offline
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Not really.

Read the last paragraph:
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__________________
Quotes to live by:
guessing gets expensive...drivinfaster
nothing is more expensive than a cheap BMW...c4harpe13

Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
BMW-CCA #441426
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?

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  #21  
Old 12-09-2012, 10:32 AM
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woodenbmw woodenbmw is offline
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Oooops. Looks like I need a new one. Unless there's a way to know where the set screw is supposed to be. I've been fiddling with it since I got the car a few months ago. My idle was around 1300 rpms and I had to slow it somehow...
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