help! Swap cranks but no start

[jink0619]

Do u have the pedal plugged in? Lol

Again is the throttle actuator plugged in correctly?

[diesekte]

The icv should be good. It was a known working unit I got with my car in a spare box that for some reason is actually for s54. It is clean and the valve moves freely.

I tinkered further and the car will now stay on. However when I push the gas pedal it does absolutely nothing. Are there some pins I can check voltages on on the TPS, gas pedal, or throttle actuator to pinpoint the problem?

[jink0619]

Hmmm maybe a bad ICV? Or it's not plugged in correctly?

[frantic]

Yes, the main m3 engine loom should be the same, the only difference is the o2/transmission loom is different and has alot more wiring. I have an SMG one and it works fine.

[diesekte]

Alright gents....finally found a buddy in possession of a handheld obd2 scanner, and I'm getting a plethora of codes.
P0121
P0123
P0221
P0335
P2122
P2126
P1637
Have gotten P1504 and P1508 a time or two as well

Some are intermittent if I clear them. I looked at the connections for all sensors and unplugged then plugged them back in.
Car now starts but then promptly fucks off. Runs anywhere from 1 to 5 seconds. If I push the throttle pedal at all it immediately dies.
Is it more likely that 2 TPS, a crank sensor, and the sensor in the gas pedal are haywire, or the wiring harness that came with my swap is toast.
If the harness is bad, can I use the harness from an e46 m3 smg car even though I have the 6 speed? I ask because there is one on ebay that looks reasonable but I think it is smg

[diesekte]

Yes, fuel feed and return are correct. I tried spraying starting fluid and it didn't work.
I was able to find my KDCAN cable but the version of INPA I had no longer works after my computer updated to stupid windows 10

I dug up an older laptop it should work on but can't find a working link...anyone?

[jink0619]

With ignition to on position the TBs should open with gas pedal down, mine does it.

Try spraying some starter fluid see if it will turn over

[frantic]

Yeah I had the same problem, Mine didn't start initially and I had to go over it all again after just leaving it for a week so I wasn't angrily going through it.

The TB's will not move until the engine starts btw, I wondered the same thing.

The fact your DME is priming the fuel pump is a positive step. Have you checked for things like if it's sparking? Is there fuel at the rail (guessing so since the pump is priming)

There is a fuse box on the o2 sensor loom worth checking too..

[jink0619]

It's probably something really simple you forgot or got mixed up. Recheck all your engine connections, cam sensor, cps, tps, etc. For me, it was the wrong fuel pump relay and I didn't have fuel rail connectors clicked into injectors, no start is a fuel or spark problem so look things over you'll get it running.

Also are ur fuel feed and return lines correct?

[diesekte]

When everything else is correct my adapter harness works properly as confirmed by many people, so I hope you aren't inferring my wiring is the problem.

Not at all...I know it works, that's why I bought it in the first place.
The problem is I have no idea where to even start. I guess the next step is buying the Bentley, cutting all the ribbed rubber and plastics coverings etc off the wires and tracing them all out. I'm just SUPER frustrated and I don't want to continue throwing money at the problem and not getting anywhere.
The engine was obviously not very well taken care of and needed a full rebuild, so I certainly wouldn't be surprised if the harness was questionable though it doesn't look fried. I am way behind schedule and over budget tearing my hair out because it seems like everything is hooked up...

[Andrew325is]

When everything else is correct my adapter harness works properly as confirmed by many people, so I hope you aren't inferring my wiring is the problem. You've already found one broken wire on your engine harness so there could be other problems with it. I suggest buying a new engine harness from BMW and make sure your DME has been flashed properly to disable EWS etc. These are complicated conversions that even good shops have problems getting to work, so hang in there and don't let it frustrate you too much. You'll get it. :)

[diesekte]

I fixed the broken wire as recommended by andrew. Now the fuel pump primes when I turn to "on" but car STILL will not start. Everything is connected exactly as it should be as far as I or any of the handful of people that have been trying to help me can tell. I am INCREDIBLY frustrated....any other ideas???
Like I said, I don't have a main relay, could that be related? I didn't seem to have one on my m52 swap though and that ran fine.
Also I still get no love from the throttle bodies when I step on the accelerator pedal.
Is anyone is dfw that can come actually look at this thing? I'm about out of ideas and super pissed at this point. I can't find my kdan cable either

[M-technik-3]

ok it gets forgotten occasionally.

[diesekte]

Thanks andrew, will get the wire connected appropriately and report back.

Just thinking do you have a fuel pressure regulator installed?

Yes, I am using the e46 m3 fpr.

[M-technik-3]

Just thinking do you have a fuel pressure regulator installed?