Ok Great! I was hesitant to change the fuel rate after I upped the fuel pressure because I thought it wouldn't change the VE tables.

What i did was put the heavier spring in to up the fuel...

I just installed Vortec heads on my 350 GMC Jimmy. I have the 7427 PCM and started working with the BJYL mask. When tuning my VE tables, how do I tune for greater than 100% VE?

Thanks for all the good support! I had the ICM tested twice at two locations as good. So I picked up a new one anyways, and the truck now runs great. I just saw the updates to this thread, looks like...

Update...

I have code 42 (distributor signal) and Code 56 (fuel pump relay) present. I have a short data log if anyone cares to view it. Again, the truck turns over but no spark.

And I still...

I have a 91 GMC Jimmy (full size) leaving my stuck in the driveway. My wife drove it the other day and it turned off in at a stop sign. It will turn over but will not fire. I towed it to the house...

Right, just to confirm for the $0D mask, the BPW function is a mater of setting the injector flow rate in lb/hr. and the cylinder volume. In the case of the 17104288 at 30 PSI, should be set to...

So could I use the open B5 location - Trans Temp - since I have the 700r4? I would probably use it similar to the oil temp sender found here:...

Awesome, thanks for the info Tom. 70+ PSI, that's so much higher than the original 13 PSI as designed. So are they just relabeled 4.3 injectors? Any changes in spray pattern between the two? I assume...

I didn't know the marine engines ran such high HP numbers!

Where these 17104288 injectors any special design from the original 13 psi injectors or were they simply regular TBI injectors with the...

Could I feed the signal to another pin on the 7427 PCM? I already have the WB02 signal feed to B16 and would like to keep it active. I don't have anything fed to E14 since my 7747 MAP and TPS...

Does anyone have experience with adding an inline fuel pressure sender to an EFI system. My goal would be to add something similar to this:
...

I reviewed some of the factory GM injectors listed here:

http://www.gearhead-efi.com/Fuel-Injection/showthread.php?81-GM-TBI-Injector-size-color-and-part-numbers

I was looking at the "17104288...

Alright I found the problem! My harness I build with the 7747 pigtail and ecm connector made a poor connection. I cleaned this up now have a functioning truck and pcm. If anyone is going to to make...

Gentlemen,

I feel I am in the presence of EFI legends. I have read countless threads about the 7747 to 7427 swap taking meticulous notes. I assembled a wire harness to make moving back and forth a...

I did have one question for the group, why did they use the 170301 injector in the 94-95 454 for street application, and why did they use the same injector in the marine 5.7? Anyone know why they...

I found info on these as I found these in my 1991 GMC Jimmy 5.7. The RIN-1001s are BWD Part number 57202P found here:
...

I know this is kind of an old thread but I am trying this out on my 91 GMC Full size Jimmy. The standard bin is the ARJT and I have modified with the HW lean cruise and ESC as per the instructions on...

Hi everyone. I have been locking for any type of data or feedback in regards to fuel injector sizing/fuel pressure combo that would provide the best fuel economy/ engine efficiency. I am not looking...