m30 running rough (NOW WITH VIDEO)

[tfritz]

Working on getting my m30 swap done and it is running rough. I dont know how to really explain it, but to start it I have to give it throttle, and when it starts I have to stay on the throttle to keep it running, but it revs, then drops, then revs, then drops, etc. Sounds like a huge cam at idle (which it has), but I am revving it up where it should smooth out. At first I thought it might have been the cam sensor but I just replaced all the plug wires and sensor. The only thing not hooked up is the o2 sensor, will this make that big of and effect?

Specs on motor/swap:
m30b35
292 cam
miller maf and WAR chip
m20b25 harness
new bav auto plug wires with cam sensor

Thanks.

[Grand525]

vacuum hose issue?

[tfritz]

Pretty sure all vacuum hoses, etc. are hooked up..

[csermonet47]

It does sound a bit like vacuum. Maybe check your grounds too?

[tfritz]

Which grounds? The engine is grounded with a new cable from motor mount to body. Im pretty sure the harness ground is secured but I will make sure tomorrow. Should no o2 sensor cause anything like this?

[csermonet47]

Your grounds should be fine then. Did you sand paint off the mount so it is metal to metal? O2 sensor would only cause it to run closed loop and a bit on the rich side. I would double and triple check vacuum.

[tfritz]

I will double check my grounds and vacuum

[tfritz]

Okay, so I did find a small vacuum hose unhooked (went to charcoal canister), and tighten the grounds and sanded some paint off the ground on the motor mount. It still runs like crap and surges. There is no alternator hooked up and some of the injectors are turned so the shorter wires on the m20 harness would reach ( i dont know if that affects anything). Currently trying to get a video of it running to load..

[tfritz]

Needs throttle to start, will run while barely on throttle, if more throttle is given it surges...

[tfritz]

after searching on here all evening, i believe I have one of the vacuum lines on wrong.
Also wondering where to hook up the brake booster hose??...

[tfritz]

Corrected my vacuum lines and it still runs the same. While running I unplugged the tps, ran the same. Also while running I unplugged the miller maf sensor, and there was no change...

[mini612]

tfritz, I'm currently doing the same swap but with b34. I also couldn't find a place to hook up the Brake Booster hose and was told I have to tap it to the intake mani.

[tfritz]

^Yeah i figured that out, i was just stumped since this motor came out of my bro's e34....that is the least of my worries now tho, I need this thing to run right!

[ttrousdell]

I ran with no o2 for a month in my e30 m30b35 and used the m20b25 harness and it ran without a hickup. If its not intake leaks I would suspect that youre getting a wrong signal to the ecu because of a faulty maf, tps, etc.
My brake booster set up...

[Grand525]

One of the injector harness is not fully connected?