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Hey Curtis... M20

Guest Anonymous

By Guest Anonymous
in BMW 2002 and other '02

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Guest Anonymous

Guest Anonymous

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I just looked on my car. I don't have a black/green wire in the round firewall plug. I pulled the rubber back at the plug on both sides and I don't see a black/green. What I do see is Black/Yellow-- starter solenoid 12v+.

This IS where you are talking about isn't it?

Bill

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Guest Anonymous

Guest Anonymous

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Sorry this is slightly off-subject...

Did you splice the M20 harness at the big round plug that sits next to the intake manifold, or did you do it closer to the ECU? It seems like the big round plug is close to all the 2002 wires, but the discussion seems to indicate that you are doing it closer to the ECU.

Thanks,

-Ben

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Guest Anonymous

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I checked my (1990) engine harness plug, pin 15 is black/green, but it is not hooked up to anything (its a thin wire, if that helps) Have you double checked the green ones? The 2 *small* green ones out of the m20 engine harness go to the *big* green one out of the 02 harness. Sorry, I didn't get the pin #'s for the small wires. Thats your spark; one of the greens feeds the coil.

What are the symptoms again? Your fuel pump is churning, everything seems a go, but no spark? Do you hear a 'buzzing' sound? (your ICV should 'buzz' when the key is turned to ACC. Mine does at least...always has.).

Side note, if your ICV is not plugged in, the engine won't start. Ask me how I know :)

Matt

'72 02/m20

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Guest Anonymous

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If you are splicing, you splice it in right before the end of the big round engine harness plug that is just hanging there. But preferably you get the other side of the plug; on the e30 chassis the chassis plug comes out of the firewall on the drivers side, just cut this out with half a foot of wires to spare. Wire the end directly into your 02 harness, then you can just plug it into the m20 engine harness and you're done. Makes it easy to take the engine out and not have to cut your wires again :)

hth

Matt

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Guest Anonymous

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Hey, I have the big black and yellow to the starter, that cranks. I have the two greens to the 02 green and that apparently doesnt work. I have it when i turn the key on it buzzes the ECU and ICV and cranks but there is no spark and no fuel. I can jump to just give the fuel pumps power and i know that they work because i can pull the regulator hose off and it pours out. I know it's got to be one trigger wire somewhere that isn't letting it start but I don't know where. The ECU worked great in a 325i I have so I take that as meaning it works, could I be mistaken? What about the charcoal canister? I don't have one but hear I don't need one, do I? Any other Ideas? Oh and when the ECU is plugged in, the starter seems to spin faster but still no spark or fuel.

Thanks guys!

Curtis

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Guest Anonymous

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okay, how is the fuel pump wired up? is it relayed or straight through or? Then again, if you are not getting spark either, it would indicate something else.....damn that '87 wiring!

Charcoal cansister, you don't need no steeenkin' charcoal cansister!!! well, not in Canada you don't at least :)

MK

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Guest Anonymous

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Img_0197.jpg

Borrowed you pic, hope you don't mind.

Are you talking about the big black round plug that is between the dipstick and the K&N in your picture? Or are you talking about one of the smaller plugs on the ECU side of the harness? (it would be on the left side of the pic)

Thanks

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I have the fuel pump on a relay in the trunk and on a switched 12v wire. Just to be dumb, I think next chance I get I'll make sure there is a rotor in the distributor.

Curtis

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Guest Anonymous

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The plug between the dipstick and the K&N is just a diagnostic plug. It just sits there. The 2 little plugs that are at the end of the harness where the ECU plugs in are also not neccesary. They just sit there as well.

The engine harness plug that you want is, well, hanging off the engine harness. Its a biggggass bunch of wires going into a big plug, around 2inches in diameter. It will be sorta at the rear of the engine, mine is sitting on top of the 02 brake booster.

I have a pic somewhere, I'll try to find it.

Matt

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Guest Anonymous

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what did you use to throw your battery in the trunk? I used the e30 setup. Along with the big positive cable, there is *another* smaller black wire that runs along with the big positive. On the battery side the little wire goes right into the clamp that bolts onto the battery terminal. It goes to.....crap, I can't remember now..but its hooked up to....argh...I may have to go check.

Anyways, if you used the e30 setup, is this 2nd wire hooked up? if not, well, I think you need something there...

Matt

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Guest Anonymous

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that might be it because i used the TEP rear brace with my ground in the trunk and just a big fat one to the starter from the battery. See if you can't figure out where it goes.

Curtis

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Okay, so take a look at the engine harness where it plugs into the ECU. Going about 2 or 3 feet BACK from this... (on my car I have the harness running along the firewall from one side to another, and the area to look at is about in the middle)...there are 2 SMALLER WIRES (maybe enclosed in one sheath) that come out of the BIG harness. They have 2 or so feet of wire. At the end are eyeletts. These are hooked up to my e30 terminal post...to *hot power*. That little wire I was talking about that runs the length of the e30 positive to the battery? THAT is what is connected to these 2 wires....so they are always hot.

Should be easy to find, if not, I can go take some pics (as long as my digi has batteries :)

Matt

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I ran them back to the starter which I guess would be switched power but the battery cable runs to there too. Think I need to route them to the battery instead of the starter?

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well, if the battery runs to the starter and these 2 are on the same post, then they are hot, which is good. Unless the 2 little wires are on switched power, then that may be the issue. Well, it may not be a problem, but its not how it was originally.

Out of all things car related, electrical is the one I have the most trouble with by FAR, sorry I can't be of more help!

Matt

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Yeah, the electrical is by far the worst, but I am stumped and I know it has to be some 12V feed or something simple that I have wired wrong. I'll try routing them to the battery to make sure they are getting hot power.

Curtis

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