I have an 87 na I basically swapped over with a 93 13brew streetport engine and I also have a place here in Boise ID working on the wiring for it. So we got the wiring from the 93 and are running a reflash ecu with tuning for aftermarket exhaust and refined ignition timing etc. The upgrades I have are a 3 inch downpipe with magnaflow cat and muffler. I also have a prolite flywheel with 6 puck clutch. The engine is mild streetport with about 5000 miles. I have new rebuilt twin turbos on it. I also have a fmic with two hks blow off valves. All new silicone emissions hoses. New coil packs and plugs and wires. Cold air intake. The engine also had turbo II low compression rotors put in it. Now, to the problem, I have a major issue with cold starting. I have to turn the engine over about 20 times to get it to finally start. While turning it over it fumbles and then follows with a loud backfire about every 6th or 7th time I turn the ignition over. Engine also doesn't like to go over 6000 rpm when being driven. I also don't know if its normal but I can here the fuel pump constantly prime when I turn the key over which I'm told is normal but I thought it was a little unusual. When it finally starts it seems like it is running great. The shop that has the car says it is running to rich though. When its warmed up the car starts with no hesitation. I hope I didn't bore anyone with my long drawn out issue but I really would appreciate any ideas. Pettit Racing said it could be a bad crank sensor or air temp or coolant sensor. Update maztech disconnected my fuel pump and the car ran for 4 mins without fuel pump. could i have a bad regulator or pulsation dampner that is causing a build up of fuel? again i also bought a use map sensor could that be the culprit of rich running conditions? i get the car back today. I will post some videos to help. I need a specialist rotorhead that can offer any advice

 

false alarm. found out the air temp sensor is reading 40 below zero at all times when the car is running. that should solve my flooding issue and rpm cut outs

 

Glad you found it. I know it's worthless now, but I would have also suggested checking the fuel temp sensor.

Also wondering why you swapped TII rotors into a 13bREW?

 

i bought the engine as is with no say in the matter. good thing is if i ever want to push heavy boost using a single turbo set up, the lower compression t2 rotors actually help avoid detonation. it a really popular set up in japan. if i ever do a rebuild i will swap out those rotors with a set of fd ones i have sitting at home