Author Topic: M42 Self destruction suicide Revival thread... (Read 7469 times)

fiftytakedowns · « **Reply #15 on:** February 05, 2011, 08:31:59 PM »

I'll think about it or a 24v m50 or something. I'm getting more and more irritated with the m42, although I like the gas mileage. If I even get good gas mileage, my ODO is broken; I wouldnt know either way. The e30 is really taxing on me mentally.

Now the car drives and is what I woul like to say "done" I still have a bogging issue when the car is not completely warmed up, and I have replaced every sensor ETC. and Even When I am driving, Ill be driving at liek say 2500K RPM and cruising, and the car will just start bucking violently out of nowhere, as iff there is no fuel pressure or spark etc.. I think my wiring harness has been Fucked with hardcore.

colin86325 · « **Reply #16 on:** February 06, 2011, 02:01:10 PM »

You might want to check the wiring harness that goes to the AFM. Mine used an intermediate connector that went between the AFM and the main wiring harness. Anyway, when I disconnected this I found water and corrosion that was causing my car to buck and refuse to rev above 4500 rpm or so.

fiftytakedowns · « **Reply #17 on:** February 07, 2011, 02:08:11 AM »

Quote from: colin86325;101190

You might want to check the wiring harness that goes to the AFM. Mine used an intermediate connector that went between the AFM and the main wiring harness. Anyway, when I disconnected this I found water and corrosion that was causing my car to buck and refuse to rev above 4500 rpm or so.

how far up the harness was this collector, I wouldnt be suprised if it was something like this.

fiftytakedowns · « **Reply #18 on:** February 07, 2011, 02:09:24 AM »

In addition: m42's got a super irritating problem and I have lived with it for nearly 2 years now. and I am pretty much fed up with it. I've been contemplating 24v for this reason.

Anyway:

The car literally can not drive when It has not fully warmed up. it will idle (HARDLY), and will immediately Cut out/ Die / BOG if you tap the gas.

This problem gets increasingly worse the colder it is outside.

I have no clue what It could be as I thought I had replaced most of the parts involved. But I did get multiple parts at the JY to hope that I could systematically eliminate with no luck.

colin86325 · « **Reply #19 on:** February 07, 2011, 12:34:17 PM »

The intermediate harness is about 2 feet long or so and connects directly to the AFM. Some cars do not have this item. It's worth checking though.

fiftytakedowns · « **Reply #20 on:** February 07, 2011, 02:09:43 PM »

Did you just cut it back and check out the wires wrapped inside?

doitover · « **Reply #21 on:** February 07, 2011, 02:44:43 PM »

Have you checked the Idle Control Valve?

fiftytakedowns · « **Reply #22 on:** February 07, 2011, 10:16:32 PM »

Quote from: doitover;101231

Have you checked the Idle Control Valve?

I have literally replaced it with three other units, all proven to be working, and cleaned Etc.

colin86325 · « **Reply #23 on:** February 08, 2011, 12:42:14 PM »

Quote from: fiftytakedowns;101229

Did you just cut it back and check out the wires wrapped inside?

You might not have this item installed on your car--it was added as part of a recall campaign. I cannot find a picture of it on Realoem. It should be apparent if it is indeed installed.

fiftytakedowns · « **Reply #24 on:** February 08, 2011, 01:41:41 PM »

ohh okay.

fiftytakedowns · « **Reply #25 on:** February 09, 2011, 03:01:17 AM »

IS there any way to isolate whether this is a Fuel issue, a Spark Issue, or an electrical Issue?

Im planning to attack this in a couple ways this weekend:

- I am going to replace the ground strap between the block and the Chassis, because it looks very rough, and the wires are exposed.

-Additional ground between head and block for sensors.

-check all other grounds for contacts specifically the one from the DME to the shock tower or battery tray. (for some reason my hood has a ground strap on it) Any other grounds to check?

For Fuel:
I will jumper the Fuel Pump relay and see if for some reason something is telling the fuel pump to stop working maybe?? causing agressive Bogging, or no running whatsoever.

Check to see if any return fuel lines under the car have been Kinked cuasing fuel pressure against the flow.

I ahve no Idea how to test if it is not getting spark. or anything. Im really confused what would cause such an aggressive failure.

Here are some Videos of how it runs:

http://www.youtube.com/watch?v=Eu5npniUyl4

http://www.youtube.com/watch?v=NF3NEp_dnX4

fiftytakedowns · « **Reply #26 on:** February 10, 2011, 11:31:12 PM »

I made some headway today.

the sensors Checked out pretty good CPS had a like 650 ohm reading while the camshaft sensor was like 1300 ohm.

I think it's a spark issue becuase now it's acting like it's hitting a REv limiter. Im hoping there isnt some fucked Wiring somewhere. and I added and extra ground between the shock tower and the intake plenum.

Any Ideas?

I am getting two different ECU readings

Of my MARK D chip ECU the engine wont rev past 2K rpms and its spitting out a 1271 code

off the stock ECU no chip Im getting a 1244 code and it's revving up to 3.5K rpm before it does the misfire/sputtering now..

fiftytakedowns · « **Reply #27 on:** February 10, 2011, 11:43:46 PM »

I thought I would mention that When the car was warmed up this misfiring, sputtering jerking Etc. WAs intermittent and would show up randomly. I also tried wrapping the coil wires separately too see if there was a noise issue etc... but to no avail.

colin86325 · « **Reply #28 on:** February 11, 2011, 02:13:45 PM »

How old are the coils? Can you swap them out with a borrowed set?

Also, teh spark plug wires really get chewed up in the shitty stock plastic wiring harness, which can lead to a misfire. You might be able to see the misfire in a completely dark garage if you pull the cover off the wiring harness.

fiftytakedowns · « **Reply #29 on:** February 12, 2011, 12:40:47 AM »

I tried to replace each individual coil with a new one, and none improved it at all. Each was showing spark even when I was disconnecting the Boot, and watching the arch, it was always arching.