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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E46 (1999 - 2006)

E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 02-23-2009, 10:39 AM
darran darran is offline
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car revs go up and down on

hi my bmw e46 compact when stoped at traffic lights i noticed rev counter engine revs going up on theyer own to about 1 to 2ooo revs they drop back down would this be anything with the coils i replaced about two mounths ago or anything else you may know of.
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  #2  
Old 02-23-2009, 10:46 AM
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Solidjake Solidjake is offline
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Get hold of an OBDII scanner and tell us if there are codes.
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  #3  
Old 02-23-2009, 10:57 AM
darran darran is offline
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ok ill try and see if i can get any codes ive read some posts would it be cleaning the idle control vaulve how do you clean this where is it
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  #4  
Old 02-23-2009, 12:51 PM
ThreeTwoFive ThreeTwoFive is offline
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Quote:
Originally Posted by darran View Post
hi my bmw e46 compact when stoped at traffic lights i noticed rev counter engine revs going up on theyer own to about 1 to 2ooo revs they drop back down would this be anything with the coils i replaced about two mounths ago or anything else you may know of.
any misfiring?
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  #5  
Old 02-23-2009, 01:20 PM
darran darran is offline
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Originally Posted by TrickTizzle View Post
any misfiring?
no missfire can drives well just when its idle it goes up to 1500rpm then back down but performance feels normal just put full tank fuel in and some injection cleaner any advice
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  #6  
Old 02-23-2009, 01:22 PM
Lanc3r Lanc3r is offline
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Originally Posted by darran View Post
no missfire can drives well just when its idle it goes up to 1500rpm then back down but performance feels normal just put full tank fuel in and some injection cleaner any advice
Fuel filter was changed when? What are your miles? How about the air filter? Any maintenance done?
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  #7  
Old 02-23-2009, 01:26 PM
darran darran is offline
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Fuel filter was changed when? What are your miles? How about the air filter? Any maintenance done?
air filter changed last year and fuel filter two years ago spark plugs oil change three months ago and new coils two months ago
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  #8  
Old 02-24-2009, 12:55 PM
darran darran is offline
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driveing car home today engine light come on says in book exhaust emissions values have deteriorated car still drives well but idle revs up to 1500 and back down what do you think
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  #9  
Old 02-24-2009, 01:12 PM
ThreeTwoFive ThreeTwoFive is offline
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fuel injector cleaner...go get sta-bil from your auto place...they'l try to sell you "sea-foam" dont buy that. buy sta-bil.
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  #10  
Old 02-24-2009, 01:23 PM
darran darran is offline
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i placed fuel injector cleaner in last night did 100 miles today in it now light has come on took air box out checked filter no air leaks or cracked pipes i can see i did replace coils and plugs two months ago is it worth changing plugs and coils around i have two spare coils to change them also i can get it onto machine by next week ive read about icv but i dont know if it has one or is there anything else i can check
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  #11  
Old 02-24-2009, 01:30 PM
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Solidjake Solidjake is offline
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Use periods please...
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  #12  
Old 02-24-2009, 01:37 PM
darran darran is offline
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hi soildjake what does use periods mean sorry
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  #13  
Old 02-24-2009, 01:43 PM
sonspot sonspot is offline
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my car does the same thing when i park (back in) it rev up and down, i scanned it with Inpa Ediabas ( best investment) and nothing, it only happens when i reverse. maybe its not maybe its something..
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  #14  
Old 02-24-2009, 01:47 PM
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Solidjake Solidjake is offline
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hi soildjake what does use periods mean sorry
As in when you are done with a sentence put a period then make another sentence.

This is a period .
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  #15  
Old 02-24-2009, 01:51 PM
darran darran is offline
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ok thanks .i got that.
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  #16  
Old 02-24-2009, 01:51 PM
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Solidjake Solidjake is offline
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Thanks
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  #17  
Old 02-24-2009, 07:24 PM
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16valex 16valex is offline
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- Check for vacuum leak around the intake
- CPS ( cam position sensors )
- DISA valve leaking
- MAF ( mass air flow sensor)
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  #18  
Old 02-25-2009, 11:05 AM
darran darran is offline
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can i check these without being pluged into diagnostic machine,any photos on how to check these things thanks
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  #19  
Old 02-25-2009, 11:31 AM
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16valex 16valex is offline
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can i check these without being pluged into diagnostic machine,any photos on how to check these things thanks
You need to buddy up with a friend who knows a bit about car to work with.
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  #20  
Old 02-25-2009, 12:18 PM
darran darran is offline
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ok thanks .ill have a code tomorrow ,putting diagnostic on it ,let you know tomorrow
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  #21  
Old 02-25-2009, 04:43 PM
bimmerboy330ci bimmerboy330ci is offline
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Ah !! i had the same problem !!! and the fix was as simple as the fuel i was using !!! i was putting in 89 octane and sitting at a stop light the car was revving up and down and on occasion it would stall out on me !!
called the dealer and as soon as i told him what was going on he knew right away what the problem was !! he told me to always run ATLEAST 91 octane ! so ever since i run sunoco 94 in my 330ci and it never did it again !!
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  #22  
Old 02-25-2009, 10:03 PM
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Goldman Sachs Goldman Sachs is offline
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Change the Vanos seals yet? Fluctuating rpm is a symptom. Thought I'd throw it in cuz no one else has yet. Good Luck
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  #23  
Old 02-26-2009, 12:24 AM
darran darran is offline
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it runs on 95 octaine.i havent done vanos seal yeat going to have it scaned today, hope to find out what it is today, keep you posted later
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  #24  
Old 02-26-2009, 02:16 AM
darran darran is offline
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just scanned car ,code p1153 came up,and oxygen sensor3 bank1 ,whereis this allocated ,can it be cleaned, or is it a new part,also what is code p1153 thanks
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  #25  
Old 02-26-2009, 05:15 AM
darran darran is offline
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i just found p1153 code,o2 sensor heather circuit high voltage bank2 sensor1, plus oxygen sensor3 bank1 showed on diagnostic,the guy whom diagnostic my car,cleared the codes,then done a search again but engine light did not come on ,so ive driven 50 miles so far,and light still havent come on,so i cant check it one more time,to check it 100% sure,what code it is but so far i think its pointing to,oxygen sensor now have to find out for sure,and which one it is,also is this just wear or is this because ive replaced coils and plugs 2 months ago??????
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