TBI to Edelbrock MPFI to GM 730
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Joined: Oct 1999
Posts: 6,621
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Car: 91 Red Sled
Axle/Gears: 10bolt Richmond 3.73 Torsen
TBI to Edelbrock MPFI to GM 730
90 pickup with a zz4 isn't running after the conversion to the 730. The fuel pump primes on key-on and will start with a little gas dumped into the intake. So it's getting spark. But what kind of spark? I think we've got either a bad injector driver of some faulty wiring going between the ignition module and the ecm.
I'm going to plug in the scanner and see if I'm getting any drop counts. If not, I'll chase the wiring AGAIN and if it's not that I'm going to go to sleep and hope it fixes itself
.
Any ideas? Also, checked the injector bank resistance and they are 4ohms. Both banks get 12v with key on so that's not an issue, it's getting them to fire.
I'm going to plug in the scanner and see if I'm getting any drop counts. If not, I'll chase the wiring AGAIN and if it's not that I'm going to go to sleep and hope it fixes itself
.Any ideas? Also, checked the injector bank resistance and they are 4ohms. Both banks get 12v with key on so that's not an issue, it's getting them to fire.
Thread Starter
Senior Member
Joined: Oct 1999
Posts: 6,621
Likes: 2
Car: 91 Red Sled
Axle/Gears: 10bolt Richmond 3.73 Torsen
First time playing with the AutoProm and I like it a lot.
Update; Got it to start again with the gas and dataloged, getting RPM after it fires so the EST is all wired correction but still no fuel injectors. They're measuring 4.5ohms so now I'm afraid we got a dead ecm if it's not firing the injectors even though it's commanding it. Also, this is trying to get it to start on a stock new AUJP memcal.
<-- and that doesn't happen often.
I'm going to rig up a couple LEDs and resistors to the injector drivers to see if they're firing with the injectors unplugged.
Oh, and get this, the ecm was "tested" for an additional $2
. I wonder if we got ripped off.
Update; Got it to start again with the gas and dataloged, getting RPM after it fires so the EST is all wired correction but still no fuel injectors. They're measuring 4.5ohms so now I'm afraid we got a dead ecm if it's not firing the injectors even though it's commanding it. Also, this is trying to get it to start on a stock new AUJP memcal.
<-- and that doesn't happen often.I'm going to rig up a couple LEDs and resistors to the injector drivers to see if they're firing with the injectors unplugged.
Oh, and get this, the ecm was "tested" for an additional $2
. I wonder if we got ripped off. Thread Starter
Senior Member
Joined: Oct 1999
Posts: 6,621
Likes: 2
Car: 91 Red Sled
Axle/Gears: 10bolt Richmond 3.73 Torsen
Originally posted by RBob
Hate to even bring this up, did you uncheck the VATs box in the bin?
RBob.
Hate to even bring this up, did you uncheck the VATs box in the bin?
RBob.
Here's the short story; I was getting crunched for time and being pulled inside and out between the computer and truck while they were doing the repinning. Between all that I got about 80% done with the bin I wanted to "run" the vehicle on before they were done repinning. When that happened they wanted to get it started ASAP but I wasn't ready with the bin (which I did disable VATS). So I told em to try it with the AUJP memcal
, I'll go over there tomorrow and let you know if that fixes it, pretty sure it will... thanks.Note to self and rest; Don't get pressured for time, there's a REASON why I'm not ready! lol
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