Need help!! 94 318i has misfire, I can't figure out. - Bimmerfest - BMW Forums



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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 09-11-2019, 06:28 PM
Danielrom Danielrom is offline
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Need help!! 94 318i has misfire, I can't figure out.

So I have a 94 318i, that I decided to do a valve cover gasket change, and figured I'd change the spark plugs while I was at it. After the job was done, I fired the car up, and it idles terrible, and the engine the lob sound. I looked back over the cables and the #1 cable had a tear in the boot and would shock me when I touched it. I got a new set of spark plug wires, which did not fix the problem. I did the stomp test and the only code it gave me was 1226(#2 knock sensor). Ive exhausted my knowledge on the subject, and don't know where to look next. I used spec torque on the spark plugs, and from what I can tell all the wires are getting spark to them. Any direction is greatly appreciated!
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  #2  
Old 09-11-2019, 07:51 PM
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My guess is you've got the wires crossed up. Been there, done that on my 318. Embarrassing, but easy to do with the weird way BMW routes the wires under that cover.
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Old 09-11-2019, 08:00 PM
Danielrom Danielrom is offline
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I've got them going 1234, starting from the forward most cylinder back to the rear of the engine. As far as I can tell that's how it was before I touched anything. Is that the correct sequence?
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Old 09-11-2019, 09:21 PM
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hornhospital hornhospital is offline
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That's right as to which cylinder is which, but how about connecting to the coil pack? Do you have a rectangular coil pack, or a square one?
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BMW-CCA #441426

1993 325is M3 clone"Ashlyn"; 1993 325is "Elvira"; 1985 635CSi "Katja"; 1984 633CSi "Sylvia"; 1987 325is "Odette";1995 318is"Bebe "; 1985 325e "Hazel Ann"

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Old 09-12-2019, 04:02 AM
Danielrom Danielrom is offline
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Rectangular coil pack, I have it in the same order on there too, starting with 1 for most and then 2 moving back. I've taken the wires all off and put them on one by one just to make sure they are in the right order.
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Old 09-12-2019, 05:53 AM
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There's your problem. The coils are not numbered 1-4 from front to back. They are 3-2-1-4 front to back. Try that.
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guessing gets expensive...drivinfaster
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Ken Kanne, Silverhill, AL, Bimmerfest Site Moderator
BMW-CCA #441426

1993 325is M3 clone"Ashlyn"; 1993 325is "Elvira"; 1985 635CSi "Katja"; 1984 633CSi "Sylvia"; 1987 325is "Odette";1995 318is"Bebe "; 1985 325e "Hazel Ann"

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Old 09-12-2019, 09:05 AM
Danielrom Danielrom is offline
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So on the cool pack, the forward most post connects to the wire going to the 3rd cylinder?
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Old 09-12-2019, 09:30 AM
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Correct! I told you it was weird.
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guessing gets expensive...drivinfaster
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BMW-CCA #441426

1993 325is M3 clone"Ashlyn"; 1993 325is "Elvira"; 1985 635CSi "Katja"; 1984 633CSi "Sylvia"; 1987 325is "Odette";1995 318is"Bebe "; 1985 325e "Hazel Ann"

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Old 09-12-2019, 09:31 AM
Danielrom Danielrom is offline
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I'll give it a shot.
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Old 09-12-2019, 04:32 PM
Danielrom Danielrom is offline
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No luck. I tried it with the forward most plug, going to the 3rd post on the coil pack, 2nd to the 2nd post, 1st to the 3rd post, and 4th to 4th post. It made it run worse, but when I moved it back to the 1234 positions it improved slightly. Still lobbing and shaking a lot.
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Old 09-12-2019, 04:59 PM
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Are you sure the coil packs are good?
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Old 09-12-2019, 05:01 PM
Danielrom Danielrom is offline
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As sure as I can be. I've got two of them now, and they both do the same thing. It's getting spark to all the plugs. Do you think the ecu, was damaged or something like that?
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Old 09-12-2019, 05:06 PM
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I doubt it.

What kind of spark plugs did you replace them with? I remember on one of my e39's I changed the spark plugs and the engine ran like crap. Ended up putting the old one's back in until I could get another set from another brand.

Since you only have four cylinders, it's worth a shot to throw in the old spark plugs and see if it runs like it did before you started the work
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Old 09-12-2019, 05:12 PM
Danielrom Danielrom is offline
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Well I changed them to the pre gapped ngk's that I read on the forum was the ones to get, but I changed them back to the old ones that are adjustable. They now also didn't work, I tried a new set, that's like the old set, but no luck. For the sake of trouble shooting I've got the old set back in since they are proven.
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Old 09-12-2019, 05:12 PM
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And Sorry Ken, not to disrespect or anything.. But a quick google search I came up with this firing order for the m42 (1-3-4-2)



PS: I know nothing about these motors
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Old 09-12-2019, 05:14 PM
Danielrom Danielrom is offline
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I'll give that a shot too.
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Old 09-12-2019, 05:22 PM
Danielrom Danielrom is offline
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No good. She really didn't like that, lol.
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Old 09-12-2019, 05:37 PM
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Interesting, was that knock sensor fault there before changing the VCG and plugs? Could be something to do with that
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Last edited by cmybimmer; 09-12-2019 at 05:38 PM.
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Old 09-12-2019, 05:49 PM
Danielrom Danielrom is offline
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It never had a cel before, and most of the time there's not even one now. not sure if the stomp test saved that code from before I owned the car, or if it just started. I wondered that too if some how the vcg change did something. I don't know what or how though.
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Old 09-13-2019, 10:57 AM
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Quote:
Originally Posted by cmybimmer View Post
And Sorry Ken, not to disrespect or anything.. But a quick google search I came up with this firing order for the m42 (1-3-4-2)
Firing order isn't the same as how the plug wires connect to the coils. If I'm wrong, I apologize, but I know the coil connection isn't 1-2-3-4 front-to-back. First time I had the wires off the coils I reconnected them like that and it resulted in some spectacular backfiring.

If I recall, the connections are marked on the coil, underneath, next to the plug wire ports.

By the way. I like your new sig pictures, Usama!
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Quotes to live by:
guessing gets expensive...drivinfaster
nothing is more expensive than a cheap BMW...c4harpe13
buying a ratty example (of a BMW) is a parasitic relationship.(and you ain't the mosquito) 7pilot
Ken Kanne, Silverhill, AL, Bimmerfest Site Moderator
BMW-CCA #441426

1993 325is M3 clone"Ashlyn"; 1993 325is "Elvira"; 1985 635CSi "Katja"; 1984 633CSi "Sylvia"; 1987 325is "Odette";1995 318is"Bebe "; 1985 325e "Hazel Ann"


Last edited by hornhospital; 09-13-2019 at 11:00 AM.
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Old 09-13-2019, 11:01 AM
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Quote:
Originally Posted by hornhospital View Post
Firing order isn't the same as how the plug wires connect to the coils. If I'm wrong, I apologize, but I know the coil connection isn't 1-2-3-4 front-to-back. First time I had the wires off the coils I reconnected them like that and it resulted in some spectacular backfiring.

If I recall, the connections are marked on the coil, underneath, next to the plug wire ports.
That's why I had to post that disclaimer that I know nothing about these motors

Never worked on these motors, nor did I have a car that had one so your input is worth more than mine
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  #22  
Old 09-13-2019, 03:35 PM
Danielrom Danielrom is offline
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So today I tested each plug wire outside the engine with a spare plug, and all 4 had good spark. I ordered a 3rd set of plug wires also. I can't see how it's anything other then, wires or coil pack.
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  #23  
Old 09-13-2019, 03:45 PM
Danielrom Danielrom is offline
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The order of plugs on the coil pack is 1234. Unless the new coil pack and wires are also messed up like the old ones. I don't know what to look at next, with the car.
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Old 09-13-2019, 07:12 PM
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I'm glad you got that and it has the plug connection ON the coils. Mine was different....it gets a bit confusing since there are at least 4 different coil packs for the M42/M44 engines.
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Quotes to live by:
guessing gets expensive...drivinfaster
nothing is more expensive than a cheap BMW...c4harpe13
buying a ratty example (of a BMW) is a parasitic relationship.(and you ain't the mosquito) 7pilot
Ken Kanne, Silverhill, AL, Bimmerfest Site Moderator
BMW-CCA #441426

1993 325is M3 clone"Ashlyn"; 1993 325is "Elvira"; 1985 635CSi "Katja"; 1984 633CSi "Sylvia"; 1987 325is "Odette";1995 318is"Bebe "; 1985 325e "Hazel Ann"

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