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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)

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 05-16-2013, 06:21 PM
CeruleanCoyote CeruleanCoyote is offline
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M42 Help

So I actually have a 1976 BMW 2002 but it has an E36 M42 swapped into it. The problem is it isn't revving past 4000 RPM. It starts, runs, and drives amazingly, just up to 4000 RPM then it's almost as if it's being stopped and it seems if I go any more it will explode. Any one else have this problem? Anyone know what's wrong? I was told it could be the timing but I don't think it is because it runs great otherwise. I was thinking about trying to replace the coil packs, wires, and plugs just because..
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  #2  
Old 05-16-2013, 09:24 PM
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hornhospital hornhospital is offline
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Sounds like a low fuel pressure problem to me. Have you checked it? What pump are you using?
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  #3  
Old 05-16-2013, 09:35 PM
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Archetype Archetype is offline
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Sometimes a partially clogged cat will do this. Something to check on.
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  #4  
Old 05-16-2013, 09:37 PM
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hornhospital hornhospital is offline
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Good suggestion! I didn't think of that.
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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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  #5  
Old 05-17-2013, 07:16 AM
CeruleanCoyote CeruleanCoyote is offline
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I have an aftermarket race fuel pump, I can't think of the brand off the top of my head. But are you just saying that it's not powerful enough?

How would you recommend checking my cats?
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  #6  
Old 05-17-2013, 03:47 PM
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not convinced of the cat issue...color me skeptical, but it's been my experience that a cat that is restricted will affect all rpm performance ranges...

i'd check fuel pressure, regardless of what sort of pump is in there. a restricted filter will nly let so much fuel pass thrugh. that being said, i would expect to see some sort of hesitation related to load, as this is when fuel is needed more.

i'm thinking maf. somewhere in the back of my mind i remember several others that has similar issues and it was a default setting in the dme regarding a faulty maf reading.


especially if the fuel pressure is in spec.




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  #7  
Old 05-17-2013, 09:15 PM
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My (then) fianc'e drove 6 hours to see me on leave. Her car would nt go above4500rpoms the whole 6 hours. Determined to see me, she limped it there and I had to figure out what was wrong. It WAS a partially clogged cat and the long drive burned a hole in the side of the manifold. I dont talk out of my azz, If I dont know (or have experience/educated reasoning to back it) ... I wont speak. I dont enjoy looking like a pendejo.

Not saying I know that's the issue... but highly likely, based on experience.

A FULLY clogged cat can affect all rpm's ranges... or it wont run at all. Depends if you have two cats or one.(exhaust)
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Last edited by Archetype; 05-17-2013 at 09:17 PM.
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  #8  
Old 06-13-2013, 06:16 AM
CeruleanCoyote CeruleanCoyote is offline
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Sorry for the late update, but I have brand new cats now and it still does it.
The MAF was checked and it's in new condition, still doing it.
I gave it a tune-up, still doing it.
I had the fuel system checked, and it's good.
Others have told me to try replacing the crank position sensor, O2 sensors, or try replacing some throttle position sensor.

Any other ideas?
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  #9  
Old 06-13-2013, 08:09 AM
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hornhospital hornhospital is offline
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Wait a minute.....what tachometer are you using? Are you sure it's accurate? You may actually be hitting a much higher RPM than what you think, and it's just hitting the rev limiter. I can't understand how it can crank, idle and run so well up to 4000 RPM and then just go no faster.

By the way, I'd love to see some pictures of the engine swap. I have a friend with three 2002's, and he has an M42 to drop in one of them. I'd like to show him some photos of a completed swap, since he's apprehensive about how tight a fit it will be.
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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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  #10  
Old 06-13-2013, 12:00 PM
CeruleanCoyote CeruleanCoyote is offline
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It's a new speed hut tachometer, so it's accurate. You can tell it's not revving higher just by when I have to shift and how fast I'm going while shifting. If that makes sense...

I only have one picture as of now, but I can get more  photo _DSC0089_zps3e841cce.jpg
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  #11  
Old 06-13-2013, 04:06 PM
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hornhospital hornhospital is offline
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Re: M42 Help

I see you converted it to coil-on-plug. Those wouldn't happen to be Bimmerworld coils, would they?

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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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  #12  
Old 06-13-2013, 05:08 PM
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seem to remember in the back of my mind that there have been a few other failures in similar fashion regarding the 4k rpm limit. i'd double check the maf. do you have a scope to check it?? a dvom is probably not fast enoughon the sample rate to get an accurate reading.


did you check engine vacuum?? how was the fuel system checked?? what makes it 'good'??




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  #13  
Old 06-13-2013, 05:08 PM
CeruleanCoyote CeruleanCoyote is offline
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That's not a very recent picture either. I've tidied it up quite a bit and got new coils from Bavarian autosport. It's an E36 M42 so it came with the coils, as compared to the more popular swap, the E30 M42
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  #14  
Old 06-13-2013, 05:11 PM
CeruleanCoyote CeruleanCoyote is offline
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I had the local BMW shop check the fuel system an they said the filter was basically new, and the pump was putting out the perfect amount of gas pressure for the engine. I'm thinking about just buying a new MAF and seeing if it changes anything. Do you think a vacuum leak somewhere would cause this?
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  #15  
Old 06-13-2013, 05:14 PM
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the e30 m42 used a coilpack made of a square of coils, whereas the e36 m42 is an integrated coil circuits in a single rectangle.

coil over plugs were not oe on the m44, either, but the kit is (should be) the same to convert to a coil over set up.



df
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  #16  
Old 06-13-2013, 07:20 PM
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hornhospital hornhospital is offline
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Those Bav auto COPs don't have the best reputation for reliability.
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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 06-14-2013, 09:41 AM
CeruleanCoyote CeruleanCoyote is offline
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I wish I could blame the problem on those, but it did the same thing with the Bosch. I've always used BavAuto coils on my BMW's and have never had any trouble
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  #18  
Old 06-14-2013, 05:29 PM
92_318i 92_318i is offline
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Red face

When my m42 was doing this, new plugs, wires, coils, cleaning the iacv, AFM, throttle body, running a can of seafoam through the vac lines, and replacing the 2 major vacuum lines solved it for me. I know that's a big list, but one or more of these fixed it for me.

Edit.. Battery, alternator, and alternator mounting bushings/adjusting bar were replaced too.

Last edited by 92_318i; 06-14-2013 at 05:31 PM.
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  #19  
Old 06-15-2013, 08:21 AM
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Time2Fly Time2Fly is offline
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Quote:
Originally Posted by drivinfaster View Post
the e30 m42 used a coilpack made of a square of coils, whereas the e36 m42 is an integrated coil circuits in a single rectangle.

coil over plugs were not oe on the m44, either, but the kit is (should be) the same to convert to a coil over set up.



df
This is not true, The rectangular pack you are referring to was used on the M44 and some very very late model M42. Most M42 318's use almost the same coils as the OBD1 6 cylinders. I had the same issue on my 318 M42, when I checked the resistance on the crank sensor it was very high so I replaced it and ta da it ran like a champ.
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Old 06-15-2013, 08:58 AM
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Quote:
Originally Posted by Time2Fly View Post
This is not true, The rectangular pack you are referring to was used on the M44 and some very very late model M42. Most M42 318's use almost the same coils as the OBD1 6 cylinders. I had the same issue on my 318 M42, when I checked the resistance on the crank sensor it was very high so I replaced it and ta da it ran like a champ.
ooops...meant m44,...duh....


although i have a ti with the late m42, which also used the integrated rectangular coil pack. i was not aware that the square coil pack was made up of individual coils similar to the m50, though. all of the searches i had done prior when looking for info on my coil showed the rectanglular unit, as well as a square unit, but no distinction that they were individual coils.

was looking to make my own cop harness, but decided that since i have a dead hole @ #3 cylinder i have to abandon the m42 and place a proper inline 6 in there.

i will be dropping an m52 with m50 mani, and non asc throttle body.





eventually....




df
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  #21  
Old 10-22-2013, 08:56 AM
CeruleanCoyote CeruleanCoyote is offline
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So I know it's been a long time with this thread, but I have a kind of weird update... This morning I drove my roommate to the Air Force base and after I drove through some vehicle scanner they had it was fixed.. It now revs past 4000 and I hit 6500 rpm. So that makes me think it was a computer issue and the scanner may have interfered with it therefore fixing it? I'm not sure.. It still hesitates at 4000 but it is able to go past that now.
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  #22  
Old 01-07-2014, 03:36 PM
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Check the resistance on your crank sensor.


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