I have an interesting crank no start. Looking for advice
A week ago I got my 1994 530i running by tightening my throttle cable quite a bit. It had good spark and fuel (all tested) but wouldn't start. Realized the car wasn't getting enough air and was choking itself out. This is why I cracked the throttle plate open by tightening the cable.
I drove it about 10 miles as a quick test drive and brought it home. It ran beautifully, super smooth. No weird sounds. I dialed in the throttle cable and idle was super smooth. I then decided I wanted to get everything working properly without cheating the idle system.
I cannot figure out why it wont run/idle on its own. Im at a crank no start situation now. I removed the ICV, cleaned it and tested it. Valve rattles freely and I get ~12ohm resistance when testing middle pin to each outer pin, and ~24ohm when testing outer pins to each other. From what ive read this is in spec for the M60 ICV. It also buzzes quite strongly with ignition on.
With the throttle cable backed off fully with slack (closed throttle plate) the TPS resistance starts at ~1600 ohms and goes up to about 4400 ohms at full open throttle. There are no breaks in between. Is 1600 ohms too high at closed throttle? Does the DME think the throttle is being slightly pressed and not sending power to open the ICV for idle?
Cleaned the MAF sensor, not sure if theres a way to test if its actually good, but shouldn't cause a no start either way right? One pin on the connector has battery voltage so good there.
I hooked up my smoke machine today and found a small vaccum leak at the back of my intake manifold. Theres a little 90 degree plastic hose connector thats capped off. The cap is blown out. Going to replace that cap, but not sure that such a small leak would cause a no start condition. Will smoke test again once thats done and see if theres any more vaccum leaks.
Im kinda stumped from here. I know theres a coolant temp sensor and an air temp sensor as far as the "drivability sensors" go. Worth testing those? Can they even be tested?
Also not getting anything on the stomp test. I got a 1215 for MAF sensor, but that was only after I tried unplugging it and cranking. Cleared since and no further codes
Any help or recommendations would be greatly appreciated. This is driving me nuts