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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 11-27-2012, 04:02 PM
92_318i 92_318i is offline
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318i misfire @4500rpm

Now that I've got the electrical issue taken care of, I took the car out for a test drive.

Ran through 2nd at WOT, and noticed a repeatable miss right around 4500-5000 rpm.

Seems almost as if the car is hitting a rev limiter of sorts.

If I back off the loud pedal a bit, I can get it past the miss and all the way to redline just fine

My best guess is a lack of a signal from the O2 sensor, as I still have to wire it up.

Anybody else got any better ideas? Plugs are new, seems to be running rich, so not a fuel problem...

Last edited by 92_318i; 11-27-2012 at 04:04 PM.
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  #2  
Old 11-27-2012, 04:32 PM
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ZeGerman ZeGerman is offline
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Running rich is a fuel problem.
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  #3  
Old 11-27-2012, 04:47 PM
92_318i 92_318i is offline
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Yes however, it wouldn't cause a miss like what I'm getting. Running lean might, but not running rich.
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  #4  
Old 11-27-2012, 04:50 PM
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hornhospital hornhospital is offline
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~4500 is right at when the DISA valve swings over in the manifold, changing the intake runner length. Maybe not moving as it should?

Quote:
Originally Posted by 92_318i View Post
Yes however, it wouldn't cause a miss like what I'm getting. Running lean might, but not running rich.
And a rich condition can't cause a miss? Since when?
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Last edited by hornhospital; 11-27-2012 at 05:09 PM.
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  #5  
Old 11-27-2012, 06:30 PM
92_318i 92_318i is offline
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Can't cause a miss like what I'm getting

A Misfire caused by a rich condition is different than one caused by a lean condition.

I will check into the DISA valve.
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  #6  
Old 11-27-2012, 06:39 PM
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hornhospital hornhospital is offline
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By your own admission (1) it's missing, and (2) it's running rich. Tell me how you determined it can't be the fault of running rich. Explain how a lean miss differs from a rich miss. Missing is missing. Since it's running rich, it at minimum contributes to the miss.
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1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?

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  #7  
Old 11-27-2012, 07:41 PM
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drivinfaster drivinfaster is offline
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ken, it's running ricch, so the fuel isn't missing....get it?? huh?? huh?? huh??


did i make teh funniez???


meds have worn off, so, brb, k??





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  #8  
Old 11-27-2012, 10:04 PM
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hornhospital hornhospital is offline
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David, you made me lol!

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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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  #9  
Old 11-27-2012, 11:32 PM
92_318i 92_318i is offline
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while I agree, running rich is a fuel problem, what I meant was fuel [I]delivery[I] is not an issue... filter is new, injectors were recently cleaned, and certainly arent clogged, etc.

I'm asking if the ECU will cut fuel at a certain point, at WOT, if it is not seeing a signal from the O2 sensor

It feels as though the ECU is cutting off fuel right at 4500RPM.

My summer car is a Lincoln LS, notorious for faulty ignition coils (first gen cars go through them almost a set a year), so I am well versed in misfires. But this feels more like a rev limiter to me.
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  #10  
Old 11-28-2012, 02:52 AM
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TheFinanceGuy TheFinanceGuy is offline
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I'd check out that DISA valve. I had a similar problem with my m44.

When the cable opened it Caused a vacuum leak thus producing a misfire.

Have you tested the coil pack?

What type of fuel are you using? Higher compression due to carbon build up can do this as well. High grade fuel could help, but seafoam to remove carbon would be better.
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  #11  
Old 11-28-2012, 05:53 AM
92_318i 92_318i is offline
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It gets only 93 from various stations. I will seafoam it later today.
I will also look at the DISA valve.

Thanks
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  #12  
Old 11-28-2012, 06:55 AM
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hornhospital hornhospital is offline
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Quote:
Originally Posted by 92_318i View Post

I'm asking if the ECU will cut fuel at a certain point, at WOT, if it is not seeing a signal from the O2 sensor

It feels as though the ECU is cutting off fuel right at 4500.
Short answer: no. It can adjust fuel trim/ mapping overall, but it cannot cut fuel abruptly enough to cause a miss like you describe.

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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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  #13  
Old 12-05-2012, 08:55 PM
92_318i 92_318i is offline
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Ok so I took care of the rich problem, rewired the O2 sensor, and
Rewelded part of the exhaust. Car runs much better, but still misses @4500rpm.

I'm going to try running it with the DISA valve connector disconnected.
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  #14  
Old 12-06-2012, 05:08 AM
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Bimmer1995318ti Bimmer1995318ti is offline
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I suspect an Ecu problem, maybe when you were fixing the wiring something crossed and caused a disruption in the code possibly. I have a 318 as well and 4500 is when max hp is reached so I suspect your computer is confusing your max hp gain with your redline
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  #15  
Old 12-06-2012, 05:13 AM
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Bimmer1995318ti Bimmer1995318ti is offline
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When you shift at red line, your gearing and Ecu is set to bring you back to max hp (4500 rpm) so either a sensor is sending the wrong message to your Ecu regarding rpm or your Ecu is completely screwing that one up
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  #16  
Old 12-06-2012, 06:42 AM
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TheFinanceGuy TheFinanceGuy is offline
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The DISA valve opens up around 4,200 to 4,500 RPMs... the valve could be malfunctioning.
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