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Location: Midlothian, Virginia, U.S.A.
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high rev on cold start?
My '84 318i has always tended to rev up to approx. 2200 rpm for 2 to 3 seconds on a cold start. Not exactly sure were to start troubleshooting this issue. Any ideas greatly appreciated. If engine is even the least bit warm, starts and will idle at 1,100
Jan
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Jan J. Skibinski 1972 911T 1967 911S 1984 318i BMW |
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05-12-2003, 07:56 AM
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In the shop at Pelican
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Location: Los Angeles, CA
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Could be couple of things.
1. Coolant temp sensor 2. Idle Control Valve 3. Throttle posisiton Switch |
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05-12-2003, 09:03 AM
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Jared,
Thanks, will check these items out in an attempt to resolve high revs Jan
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Jan J. Skibinski 1972 911T 1967 911S 1984 318i BMW |
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05-12-2003, 09:28 AM
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In the shop at Pelican
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If you would like some of my troubleshooting articles, send me an email as well.
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05-12-2003, 12:07 PM
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Location: Surfside Beach, South Carolina
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Hey all,
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JW |
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05-14-2003, 07:46 PM
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My 84 318i has done this same thing from the very first day I purchased the car 6 years ago. I think its cool now how she roars when you first crank up' the car in the morning. I think its her way of saying "GUTEN MORGAN"... HAHAHA.
JRW
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JW |
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05-14-2003, 08:31 PM
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high rev
JRW
Good thought! It concerns me though, that at engine start up with a cold, oil not flowing well yet, is causing continued unneeded wear to all rotating parts. Am I overdoing to concern part?
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Jan J. Skibinski 1972 911T 1967 911S 1984 318i BMW |
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05-15-2003, 05:51 AM
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In the shop at Pelican
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jan, it should not cause "excessive' wear, however it is something you should correct asap.
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05-15-2003, 02:38 PM
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so is this initial high rev harmful to the car? My next door neighbor has a 94 325i BMW and his does the samething but not to the extent that mine does. I thought this is what the cold start valve is supposed to do, provid the injection system with an extrat boost of fuel until the engine has reached its normal operating temperature. I don't know what do you guys think???
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JW |
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05-15-2003, 07:36 PM
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high revs
JRW,
as Jared suggested, I will be testing the coolant temp. sensor, idle control valve, and the throttle position switch. Borrowed a Bently Manual for 318i from a friend. Manual seems to have some reasonable tests to determine if part is defective. My guess however, is that it is the idle control valve since it is the most expensive. Looks like I'll be shopping Pelicans' catalog this weekend. Need other stuff anyway.
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Jan J. Skibinski 1972 911T 1967 911S 1984 318i BMW |
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05-16-2003, 07:13 AM
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Jan,
Hey, The cheapest price I found for the idle control valve was at pelican parts, bavarian autosport wanted $50 more for the part. I have two books for repair (Chilton and Haynes) they both said one way to test the icv was to remove the electrical connector, the idle should then spike to around 2000 rpms. Good luck- JRW
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JW |
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05-16-2003, 07:43 AM
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In the shop at Pelican
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BAD IDEA. You never want to run the car with the ICV disconnected. This can send a spike through the ECU. I have sold brand new ECU's to people who did just this. Yet another reason why the Haynes manuals are not the best to have.
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05-16-2003, 07:52 AM
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Sorry, I ment not to drive your car with it unpluged. I remember you saying something about the ECU being fried in an eariler thread if this was done. So how would you test this part? How about the Chilton manuals are they good, what do you recommend?
JRW
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JW |
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05-16-2003, 08:03 AM
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Do not start the car PERIOD, unless you feel like paying hundreds for a new ECU. To test the ICV, read the bentley manual, you have to check the resistance between the terminals, i believe the values vary from year to year.
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05-16-2003, 03:05 PM
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the Bentley [Bible] states 'with the engine running , remove the harness conector from the valve. The speed should increase to approximately 2000 rpm.'
It could be your ICU, which is something I replaced on my 318i to make it idle correctly. Bentley has a whole chart MKJ 89 Mistsubishi PU 84 318I 71 Lotus S-2 Europa |
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05-26-2003, 05:57 AM
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MKJ-
Hi, after you replaced the ICU what exactly did this do to your car? Did it only correct the idle problems, anything else besides that? Thanks- JRW
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JW |
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05-27-2003, 06:51 AM
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JW
The idle returned to normal 850. Some say that you should replace both the ICV and ICU at the same time I did'nt and the car ran great. I did replace the ICV later when I was able to buy a new one on EBAY for under $40. I figured for that price I would do it. MKJ |
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05-27-2003, 03:57 PM
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MJ,
That's was an AWESOME deal on the ICV! Just out of curiosity how does your car do when you start up on a cold start? I was wondering how other 318i cars started. JRW
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05-27-2003, 06:58 PM
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JW
It revs up and than returns in 850, although I have some false air intermintly and I have replacing hoses to find the problem. I have used the carb cleaner trick and have not found it yet. MKJ |
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05-28-2003, 05:39 PM
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In the shop at Pelican
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Quote:
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05-29-2003, 03:56 PM
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