I have a 1989 camaro iroc-z 350 tpi. I bought the car a few months back not running. I had to install a vats box as someone previously cut it out and I bypassed the resistors. I’ve recently replaced the Tank
Sending unit
Fuel pump
Injectors
MAF
Fuel pump relay
MAF relays
TPS
IAC
CTS
Oil pressure switch
Plug Wires
Spark plugs
Cap and rotor
Coil
My Problem is that the car will just crank and crank and not want to turn over unless I unplug my MAF. If I plug the MAF back in right after the car starts, it will stall. I’m thinking it’s maybe a fuel issue, but it’s weird because once the car has been running for a bit and it gets warm I can plug the MAF back in and it will run fine. And once the car is warm it will start right back up fine with the MAF plugged in and idle just fine. I’m very confused and any insight would be helpful!

 

Any stored ecm codes ? Or 33/34 from
plugging and unplugging the maf ? What injectors were used and what’s fuel pressure cranking ?

 

I don't know if you have fired the parts cannon enough yet.

I don't see a new distributor assembly in your list. I'll sell you one without a cap and rotor button since you already have new ones. LoL Just joking but you seem to like buying new parts and no kidding I'll sell you one.

I hope you haven't thrown away all the parts you took off yet.

Put the factory MAF and MAF burn-off relay back on the car and try again. Start with just the MAF sensor first.

Aftermarket MAF sensors and MAF burn-off relays are sometimes made wrong. Just because it is new doesn't mean it is good.

New is not a word. N.E.W. is an acronym for Never Ever Worked.

Also could be a huge vacuum leak. The IAC valve can be a huge vacuum leak if it is wide open when it should be nearly closed shut.

 

Sorry I forgot to mention that.
No stored codes and I get a code 33 only when unplugging the MAF. I put in some cheaper after market injectors I think they were accel. And I have to rent a pressure gauge that’s the one thing I haven’t done yet is fully test fuel pressure. I assumed it would probably be good because I put new o rings on the rail and a new diaphragm on the FPR.

 

I know LOL!
Some of the parts were definitely needed as the car was sitting for 13+ years.
TPS was shot and oil pressure switch was broken. But you are completely correct I was throwing parts at it hoping my problem would be solved.

I don’t believe the IAC is wide open because when I can get the car started I did the IAC relearn. I also sprayed a little bit of starting fluid when the car was running around the runners, plenum, or anywhere I think there could be a vacuum leak with no change in RPM.

I did keep all the old parts off the car so maybe I’ll try switching in the old maf or burn off relay.

 

Sounds like fuel pressure, you can get a nice gauge kit off Amazon for like $35.