i have a 91 turbo2 and am having trouble getting it to start and run

ive drain the gas tank, clean/flow tested my injectors did the deflooding even with the oil in the spark plug hole

it wont start unless i unplug the fuel pump and it will run until it runs out of fuel
if i plug the fuel pump its hard to start and wont run at all

if i take out the top spark plugs there cover with fuel but the lower plugs are fine

any info would help me

 

Sound like low compression! Check your compression first. Mine did the same thing when i have bad compression.

Good luck

Eric

 

aite i got it running(hooked up a switch to the fuel pump ground) but it wont stay running unless i have my foot on the gas pedal and it runs really rough too any ideal would help

 

this sounds pretty much exactly like what my FD is doing, does anyone know where i can hook up a switch to my fuel pump??

 

Any trouble codes?
Check compression
Check voltages at ECU connectors from the various sensors, compare against the values in the service manual (see FAQ section, link is there, look in ch 4)
Potential culprits: water thermo sensor; air flow meter; intake air temp (in AFM); intake air temp (in plenum chamber); ambient air pressure sensor; boost sensor.

 

Compression is good..all 6 chambers has 75 psi +/- 1-5psi....no check engine light and no codes..I'll check voltage and get back to y'all

 

75psi per face is low. The factory minumum specs are around 80 psi off the top of my head, but 90-100+ psi is where you want to be. If you didn't have the throttle open during the compression test, that can cause lower numbers. Also, the fact that you're having to de-flood is probably washing the oil coating off of the housing. Add a small amount of oil before cranking over for the compression test. If your numbers are still low, you have your answer as to why the idle is rough.

 

well shopkey said it depends where you live it can range from 65-90 psi....and 75 across is not bad b/c i did it when the engine was cold.....anyways i hooked back up the apexi controller and you can give it gas now but wont stay idleing

 

compression will change with altitude. but depends. I'm at 7000 feet so 80 psi is good, but someone at 1000 feet with 80 better be saving for a rebuild.

 

Shopkey? You're trusting some random tech site that wants your money to give you rotary advice? Very bad idea. The vast majority of mechanics barely know rotary engines exist, let alone what compression numbers are normal. You'll find real answers from people that know what they're talking about here. I myself have been working on rotaries for 10 years.

As I said before, the minimum compression spec in the Factory Service Manual is 85 psi (pg. TD-2). Yes, it depends on temperature, airflow & cranking RPM, but 75 psi under just about ANY conditions is not good. That's low compression. Classic symptoms of low compression are rough idle and hard starting. I've experienced it personally on an engine that was on its last legs. Re-test your engine under ALL of the proper conditions. If it still fails, a rebuild or engine replacement are unfortunately in your future.

You mentioned an apexi controller. Would that be a boost controller? Have you been running more boost than stock without upgrading the fuel system? At approximately 10 psi, the stock fuel pump takes a dive & the fuel injectors begin to max out. This leads to lean conditions, which blow engines. What other modifications does the car have?

 

according to your profile, youre in PA, so not at 7000 feet so i agree with the above - your compression is low

 

ill recheck compression....the apexi controller controls air fuel mixture and i have a greddy boost controller...and the motor was just rebuilt like 5 yrs ago but i just put it in the car like 3 months ago

 

Mine had a hard time idling, and I found it to be a poor connection on the turbo inlet.