Hello all,
First off...Ive been lurking on these pages for many months now. I bought my first Corvette about a year ago...i'm now up to 2 (a 93 problem child in itself.. more on that in another thread).
The history of ths 89 TPI is as follows: The person I got if from sold it to me with various issues, I knew this full well and felt confidant on fixing it...stil do the price was right. At that time, the engine and tranny (auto) had separated by a half inch, was only being held together by the torch converter bolts for the most part. The engine did run, but very poorly. Ive since replaced the engine with a 500 mile engine off CL (kept the original and will rebuilt at a later date). Got the original aluminum heads rebuilt and assembled everything. I also went thru the tranny while it was out, replaced seals, bearings, converter.
OK.. here is the meat of my issues. The new motor is having the same issues as the old motor...! Ive narrowed it down to some sort of fuel ignition issue. BTW, I have a new distributor yet using the old coil (this might be somthing to look into later on). In an effort to not just replace parts at a whim. I'm trying to sluth this out. So far Ive done the follwing:
1. verified with a NOID light that I have a signal ateach of the injector harness points (all 8) good light at each.
2. I can unplug the following injector wires and the engine continues to run(poorly) without change: 1,3 and 6. If I unplug any of the others the engine idle obviously changes
3. new injectors from Standard (AutoZone)...it was a value build...
The one thing I have NOT done is check the fuel pressure, however I have replaced the fuel filter when I got the car.
In retrospect, the original engine was a mess (few and far oil changes, oil leaks.. etc etc...), however it did have decent compression roughtly 150-157 each cyl. With the exact same issuese with this motor as the last (yes I know.. I should have done the sluting sooner), it seems to be something common with between before and after. I would think the ECM, however witht he NOID lights showing a pulse... i cant think the ECM is the issue
SO....I ask for help thoughts? Fuel pressure.. fuel pump... ECM....injectors or... what am i missing... someone give me hints..
Thanks to ALL!
First off...Ive been lurking on these pages for many months now. I bought my first Corvette about a year ago...i'm now up to 2 (a 93 problem child in itself.. more on that in another thread).
The history of ths 89 TPI is as follows: The person I got if from sold it to me with various issues, I knew this full well and felt confidant on fixing it...stil do the price was right. At that time, the engine and tranny (auto) had separated by a half inch, was only being held together by the torch converter bolts for the most part. The engine did run, but very poorly. Ive since replaced the engine with a 500 mile engine off CL (kept the original and will rebuilt at a later date). Got the original aluminum heads rebuilt and assembled everything. I also went thru the tranny while it was out, replaced seals, bearings, converter.
OK.. here is the meat of my issues. The new motor is having the same issues as the old motor...! Ive narrowed it down to some sort of fuel ignition issue. BTW, I have a new distributor yet using the old coil (this might be somthing to look into later on). In an effort to not just replace parts at a whim. I'm trying to sluth this out. So far Ive done the follwing:
1. verified with a NOID light that I have a signal ateach of the injector harness points (all 8) good light at each.
2. I can unplug the following injector wires and the engine continues to run(poorly) without change: 1,3 and 6. If I unplug any of the others the engine idle obviously changes
3. new injectors from Standard (AutoZone)...it was a value build...
The one thing I have NOT done is check the fuel pressure, however I have replaced the fuel filter when I got the car.
In retrospect, the original engine was a mess (few and far oil changes, oil leaks.. etc etc...), however it did have decent compression roughtly 150-157 each cyl. With the exact same issuese with this motor as the last (yes I know.. I should have done the sluting sooner), it seems to be something common with between before and after. I would think the ECM, however witht he NOID lights showing a pulse... i cant think the ECM is the issue
SO....I ask for help thoughts? Fuel pressure.. fuel pump... ECM....injectors or... what am i missing... someone give me hints..
Thanks to ALL!