Car won't start

[1993RT/TT]

My car won't start and when i turn the key on the boost guage is maxed out. I know it has a bad knock sensor could this be causing this or is it the ECU? any help would be appreciated thanks in advance

[CoreyB]

ECU for sure.

[1993RT/TT]

i got it running and it feels just like when the injector wasn't working

[CoreyB]

Pull the ECU and check for leaky capacitors. The problems you are describing fits the classic case perfectly.

[a2j]

iirc stock "boost" gauge should show 0 before starting the car, otherwise ecu is bad.

[1993RT/TT]

i'm just curious do all the first gens have the same ECU? IF the caps look ok i would like to know if i could test it on my brother's 92 TT (june build date 18 spline).

[RealMcCoy]

i'm just curious do all the first gens have the same ECU? IF the caps look ok i would like to know if i could test it on my brother's 92 TT (june build date 18 spline).

For the purposes of testing yes... But the 93 ECU is a one year only item. The 91-92 unit will start and run the car, but the timing will be slightly off due to the different design cam and crank sensors.

[1993RT/TT]

i took the computer out and its definately damaged. Is there a difference between the cali spec and fed spec ecu's?

[RealMcCoy]

i took the computer out and its definately damaged. Is there a difference between the cali spec and fed spec ecu's?

Yes... The Cali cars have an EGR temp sensor. You can put a Fed spec ECU in a Cali car without consequence, The ECU won't know or care if the sensor is there. If you try to put a Cali ECU in a Fed car, it will set a code for the missing sensor.

[1993RT/TT]

ok so hopefully this is the last update here; After an ECU rebuild, a new knock sensor, and a new injector, the car runs the way its supposed to :)

[Atrosity]

Yay! Nice man, glad to see your car running again, I am sure it's a great feeling haha!