Author Topic: Engine hesitation. (Read 21036 times)

St�ck · « **Reply #30 on:** August 20, 2007, 09:25:22 PM »

I just called him, his phone is shut off... PWNED!!

RED IS 91 · « **Reply #31 on:** August 21, 2007, 08:22:55 AM »

I had similar problems and after much checking and testing and replacing numerous sensors it turned out to be one of my coils .So I replaced all four and the car has run sweet since.

bmwman91 · « **Reply #32 on:** August 21, 2007, 10:04:25 AM »

How much did you pay for the car? Since there are a number of small items on these that seem to be having problems at or above 120k miles, you might want to look into an overhaul of the parts that go south around now.

From what I can tell, a high percentage of M42's seem to get neglected by owners before they are sold to "enthusiast" types. Maybe it is because it is "just a 318" or something like thatm but a lot of these seem to miss some basic maintenance before being sold to people here. They really ARE trouble free motors once they have been refreshed and brought back up to snuff. Maybe the M20 world is the same way as well, but I would not know about that personally. Either way, it is annoying having to fix someone else's neglect.

Vladi · « **Reply #33 on:** August 21, 2007, 12:25:50 PM »

The M20 world is worse. Especially 2.5.

St�ck · « **Reply #34 on:** August 21, 2007, 04:25:46 PM »

I picked up the car for $1500, and yes it does need some work. Nothing I'm afraid of though. Really the first major thing is getting the engine running to its full potential.

St�ck · « **Reply #35 on:** August 21, 2007, 04:46:34 PM »

OK, Teaguer called me back. I'm going to run over to his place tomorrow afternoon and borrow his ECU, AFM, and coilpack. Is there anything else I should take off his car to try on mine while I'm there?

mlangbauer · « **Reply #36 on:** August 22, 2007, 08:49:54 AM »

I am having a similar problem but not at WOT. It misses a small amount when first depressing the accelerator then smoothes out. It will do this in all gears. The idle is perfect with ac on or off. I have replace the coils, plugs wires and the AFM...no change.

Any ideas? Seems like the concensus is the computer or the cam position sensor. Could it be something as simple as a fuel filter that needs changing?

As always, you guys are a wealth of knowledge!

Thanks
Matt

e9nine · « **Reply #37 on:** August 22, 2007, 09:53:35 AM »

Quote from: mlangbauer;32203

Could it be something as simple as a fuel filter that needs changing?

As always, you guys are a wealth of knowledge!

Thanks
Matt

When my fuel filter was clogged, the car would stutter under load and you could tell it was a fuel delivery issue as the fuel economy gauge wasn't acting normally. Gotta love how it aids in troubleshooting

mlangbauer · « **Reply #38 on:** August 22, 2007, 10:20:26 AM »

ahhh, gotcha...makes sense....this is not a fuel delivery issue i think....

mlangbauer · « **Reply #39 on:** August 23, 2007, 10:18:59 AM »

ok, started the car last night and it ran like total shi*....missed horribly all the way home. what would cause it running somewhat decent in the morning but like garbage in the afternoon? I am at a loss at this point.

Thanks
Matt

RED IS 91 · « **Reply #40 on:** August 23, 2007, 11:38:01 AM »

Quote from: mlangbauer;32272

ok, started the car last night and it ran like total shi*....missed horribly all the way home. what would cause it running somewhat decent in the morning but like garbage in the afternoon? I am at a loss at this point.

Thanks
Matt

thread highjacker!!!!!!!!!!!!!!!

St�ck · « **Reply #41 on:** August 23, 2007, 05:19:10 PM »

OK, so updates on MY car and MY thread

I picked up the ECU, AFM, and coil pack out of Teaguers good running 318iS last night.

I swapped each part onto my 318iS one by one, starting with the coil packs, then the AFM, and lastly the ECU.

No change what so ever.

Fresh ideas?

RED IS 91 · « **Reply #42 on:** August 23, 2007, 06:51:58 PM »

I haven't read where you've checked and cleaned the ICV ??
When you got the code for the TPS did you check it or replace it . I doubt it could be the TPS but ??
I love a mystery.
good luck

nickmpower · « **Reply #43 on:** August 23, 2007, 06:57:48 PM »

i bet its the carnk or cam sensor. or tps

St�ck · « **Reply #44 on:** August 23, 2007, 07:53:55 PM »

Quote from: RED IS 91;32318

I haven't read where you've checked and cleaned the ICV ??
When you got the code for the TPS did you check it or replace it . I doubt it could be the TPS but ??
I love a mystery.
good luck

I don't see how the ICV is going to affect the engine up to redline. Off idle it has no means to do anything.

I checked the TPS, opened it up, everything looks good. It also OHM'ed out fine.

Quote from: nickmpower;32319

i bet its the carnk or cam sensor. or tps

I don't think it is the TPS as said before.. it tests and looks fine. The symptom also does not change with the TPS unplugged. It runs exactly the same.

The crank sensor generally works or doesn't and the engine will not start or run without it. Doesn't mean that is not a possibility though, I have not yet counted it out.

The cam sensor won't affect drivability. It is little more then a cylinder identifier as I have found out. If it is working then the ECU fires the injectors semi-sequential (2 banks of 2) if it is not working, or is spitting out a bad sinewave the ECU fires the injectors in parallel (all at the same time) You can (and I have) unlplugged the sensor with the engine running and it doesn't bother it.