help! Swap cranks but no start

[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?

[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]

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

[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?

[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

[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.

[jink0619]

Hmmm maybe a bad ICV? Or it's not 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]

Do u have the pedal plugged in? Lol

Again is the throttle actuator plugged in correctly?

[diesekte]

Yes and yes

[jink0619]

What happens when u pull on the throttle actuator? Does the car rev?

[frantic]

I would guess you have one of the plugs on the actuator wrong? IIRC there were 2 3 pin plugs, one for a TPS and the other for the actual throttle.

[diesekte]

Took a look at things....there is one 2 prong sensor for the throttle actuator, and one 3 prong sensor for the tps. Connections are clicked all the way on. No love with the gas pedal and if I manually open the TPS by pulling on the linkage, the car immediately dies

It will run indefinitely if I just leave it be but the second it gets even a little bit of the throttle body open (by me doing it manually) it shuts down...like it's leaning out or something

[gobuffs]

There is a TPS on the throttle and one on the actuator. If they aren't in agreement you will have issues. Where in Texas are you?

[diesekte]

I will probably try to replace both TPS then. They're only like 50$ and even if they aren't totally shot I guess it's not going to do any harm.
I'm in downtown fort worth.