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Dual TBI problems

Old 03-06-2019, 11:31 AM
  #1  
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Dual TBI problems


start and run with winaldl hooked up
I have a 1982 TransAm 305 vin 7 car. It through a code 42 & 44 and I cant seem to find out why. Fuel pressure is good and when I hook up my winaldl and OBD Diagnostics inc serial cable the car runs ok and starts on first crank.when not hooked up it cranks for ever and runs like crap. I still have the codes. I have replaced the Ignition module cap rotor wires and EGR valve with no change. I have looked for vacume leaks and bad grounds. I have noticed when I first put the key to on, the fuel pump runs for about 5 secs and the #2 TB injector sprays fuel but the #2 injector does not , yet when the car does run booth injectors work normally. any thoughts would be appreciated.

Last edited by kens727; 03-06-2019 at 11:49 AM. Reason: clarity
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Old 03-11-2019, 06:07 AM
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Re: Dual TBI problems

key on engine off, injectors should not be spraying at all. might be a good idea to take injectors in and get them tested /serviced. how many PSI for fuel pressure?
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Old 03-11-2019, 11:39 AM
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Re: Dual TBI problems

Originally Posted by kens727 View Post
when I first put the key to on, the fuel pump runs for about 5 secs and the #2 TB injector sprays fuel but the #2 injector does not , yet when the car does run booth injectors work normally. any thoughts would be appreciated.
Originally Posted by morgsie View Post
key on engine off, injectors should not be spraying at all.
Faulty (leaking) injector
Faulty (grounded) wire harness
Faulty ECM

The injectors must not spray fuel until the ECM gets an "engine turning" signal from the pickup coil via the ignition module.

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