Looking for some help with a CODE 44. Just replaced injectors on my 88 GTA and added an adjustable fuel pres. reg. Used 24lb/hr Accel injectors. The motor is close to stock, I had leaky Rochester injectors giving me hot re-start problems. Now the hot start is fixed but I have a lean exhaust code being set on closed loop operation.

My thoughts were, runner or plenum leaks? I could not detect any. I doubt my 02 sensor just suddenly went but it could be possible.

This is a real bummer!

 

Make sure the injectors are seated properly and the O rings didn't get cut or roll up out of the manifold, could be leaking air past them.

 

Thanks, I'll check that out this weekend. Bummer will be pulling it all apart again!

 

Don't need to pull it apart to check them, just spray some carb cleaner ir water around the base of each one and see if it gets sucked in right away.

 

I would suspect the o2 suddenly going bad before a sudden vacuum leak or mechanical problem. Change it and if it doesn't solve your problem, take er back. BTW, solved my lean exhaust code.

 

O.K. Finally got time to work on the problem child again. No injector o-ring leaks found, to the best of my ability. Haven't tested or replaced the O2 sensor yet. Hope to get to checking the O2 sensor tomorrow or Saturday at the latest.

Thanks for the help... Any other suggestions appreciated.

 

What is your FP set at?

 

Had FP set at 45PSI, set it back to 42PSI yesterday. The Idle got better at closed loop but still sets code 44. The car idles fine and drives strong when it is still open loop. As soon as the coolant temp reaches 160 and it goes closed loop, the problems start.

Grrrrr

 

Were the injectors used? If so did you do a resistance reading on them to make sure they are good?

 

New Injectors! Accel 24lb/hr... *** NO I would not waste my time with used injectors.

 

In that case you are more than likely running rich because of the stock motor unless you have a chip burnt to compensate for the extra fuel.
If you are indeed running lean then make sure all of the injector harnesses are on tight and the corresponding wiring is intact.

 

I'll check the harness again but it idles fine ans runs strong in open loop. So I am fairly sure that all 8 injectors are functioning. I will check out the actual O2 sensor readings this weekend to see what the ECM thinks is going on.

THanks

 

this might sound dumb, and maybe you did this.... but did you ever clear the computer after you put in the new injectors and afpr? start off cheap(or free) and clear codes first if you havent done it... just a thought.

 

Turned out to be a BAD O2 sensor afterall. The sensor had a crack in the weld of the outer shell. $20 later I am back on the road. Thanks for all the help!

Hey, an easy way to probe your O2 sensor with a DMM is to go to the junkyard and cut out the mating O2 connectors from a junker and make an extention cable with a test loop in the middle. Worked great for me to monitor the sensor without third degree burns from my headers.