10$ to whoever solves my problem!

[drulle]

Send them to MEPEH

This. I highly recommend him!

[E30Kills]

Installed new collaboration temp sensor and sender uni (blue and brown ones in the thermostat) and I get 16 mpg now but my problem remains. Changed injectors and my problem remains. Unplugged my o2 sensor and my gas mileage did not change whatsoever. Exhaust leak?

[ForcedFirebird]

I suggested you test the TPS. If you have, or can borrow a multimeter, it's free to test and takes 5min. Test for dead short on two pins while throttle closed. If they are all open when throttle closed, the ECU "thinks" your foot is on the pedal and adds fuel to compensate.

Seen it many times...

http://www.e30tech.com/forum/showpost.php?p=1386084&postcount=20

[E30Kills]

Running out of ideas and money here pretty quickly

[ForcedFirebird]

Check your TPS.

[Julien]

Stuck injector is easy to diagnose. Pull the valve cover to gain access to the fuel rail bolts, lift up the fuel rail with injectors still attached to it, plug the vent hose coming from the TB and attempt to start it (may start but will ruin bad with the inj holes open). Alternately you can jump the fuel pump relay and if the inj is stuck, it will spray.

Also I have seen rich condition from a bad TPS. If the idle switch in the TPS is not working, the ECU thinks your foot is on the gas even though the throttle is closed. With enough fuel to smell up the oil, then it's more likely to be an injector.

Be careful with that, I've seen a small fire start from someone using this exact technique

[E30Kills]

Currently in class but I will check the TPS along with putting in a new O2 sensor and fuel filter this weekend. Will update soon.

[ForcedFirebird]

Be careful with that, I've seen a small fire start from someone using this exact technique

I have been doing it this way for almost 20yrs. Yes, you are correct, follow standard safety procedures, though.

[E30Kills]

New fuel filter and O2 sensor. No difference. Could it be an exhaust leak because the O2 sensor made no difference? TPS tested fine with a multimeter.

[ForcedFirebird]

Please list what you have done/checked. Throwing random parts at your car is going to be a hit or miss to repair it. Start with diagnostics.

[E30Kills]

Also he car backfires at 5500 rpm and this problem has only occurred since I rebuilt the head. Could the timing be off? I adjusted the valves but I could do it again?

[E30Kills]

New coolant temp sensors (blue and brown)
New fuel filter
New O2 sensor
I borrowed some used injectors but have some new ones coming right now. The oil smells like fuel

[straight6pwr]

take the car to someone who knows what they are doing.
seriously, this is the biggest lesson I have learned with these older BMWs.

everyone on here is just speculating, same as you. its like going to a psychic - they just keep guessing, because eventually one is going to be right.

throwing parts at oddly running BMW is a bad idea, there are tools to diagnose it. go to a good indy shop, they fix it up in a snap. more $$ up front, but less money that youll spend throwing parts yourself.

the rest of an e30 is simple and intuitive and can be learned easily with reading and manuals, but the engine management shit can really be a science.

[ForcedFirebird]

take the car to someone who knows what they are doing.
seriously, this is the biggest lesson I have learned with these older BMWs.

everyone on here is just speculating, same as you. its like going to a psychic - they just keep guessing, because eventually one is going to be right.

throwing parts at oddly running BMW is a bad idea, there are tools to diagnose it. go to a good indy shop, they fix it up in a snap. more $$ up front, but less money that youll spend throwing parts yourself.

the rest of an e30 is simple and intuitive and can be learned easily with reading and manuals, but the engine management shit can really be a science.

This is not bad advice. If you find an indy shop like ours, we will even help guide you through your own repairs once we diagnose, but the diagnosis fee is waived if we do the work. Newer cars are the same way with diagnosis. People bring their car to a parts store, have the codes read, then wonder why they spent $100 on a new oxygen sensor when they actually had a vacuum leak. Even the new car codes are for reference only. The "bad" part may just be a result of something else wrong.

[solerider]

Check this sensor, the cylinder identification sensor, its right off the distributor and runs back to where the CPS plugs into the harness (under the diag. port)

http://www.e30zone.net/e30zonewiki/index.php/CID

Mine is broken off at the spark plug wire, took me FOREVER to find out where it went!
It is supposed to let the management system know when to fire the correct bank of injectors, I have read, but have not confirmed, that without the sensor all injectors fire every time.

I have the sometimes starts right up, sometimes cranks a bit issue, but not the other problems you mention.