I'm almost done building my truck, but I have come to a sudden halt. Its a 4x4 toyota with a freshened up 5.3, ls6 cam, 918 springs, maggie, 3.2 pulley, 4l80e, self built harness. I got the engine running a couple weeks ago on a stock tune. It was very rich, wideband showing 10-1, ran pretty rough. I just put the stock injectors back in so I could get it on the trailer and over to the exhaust shop. I forgot to mention the engine was making a random knocking sound that I thought was the blower. The engine is no longer rich, but it runs terrible. I checked the blower after I swapped the injectors, no knock. For some reason I put my hand on the header and found out that 2, 6, and 8 are cold. The other 5 are blistering hot. I believe this is the cause of the knock and obviously the poor performance. At first I thought this will be easy. Checked for 12v at all coil packs as well as injectors, all good. Then I checked continuity from inj control wires to the corresponding pins at the pcm connector as well as coil control, ground and low ref wires. Everything checks fine and is pinned in the right location, according to all three wire diagrams I have printed out. I then pulled the plugs and left them hooked up and laying on the header, has good blue and white spark. I swapped 2 and 4 injector connector and even though 4 is now pulsing at the wrong time, it is still hot and 2 is still cold. The EFILive scan tool is not showing misfires on these cylinders but engine rpm is bouncing all over the place and they are certainly misfiring.I have much more info on this matter but this post is already way too long. I am on a deadline and I am about to pull my hair out. I am willing to entertain any suggestions at this point. Thanks, Brint.

 

Did you perform the crank relearn procedure?

 

sounds like bad injectors if it didn't follow the electrical change...

 

I've never heard of a crank relearn. Is that a procedure that can be done with an EFILive scan tool?

 

Yes, if the engine is running good enough to do it that is.

It will be under the DVT(F12) tab if you are running the most recent version:
DVT > Learning > CASE

or under the Bidirectional tab in older versions:
Bidi > CKP Learn

1. Start engine and connect the FlashScan
2. Set parking brake
3. Hit the CASE button
4. Depress and hold the brake pedal down.
5. Gradually rev the engine to 4000 or so RPM- it will cut out when learning is completed
6. Turn the key swith to off and allow 15 seconds for the PCM to reboot

 

if that doesn't fix it, pull you valve covers and check your rockers and valves for those three cylinders.

 

Thanks Dr.! I'll try that tonight. I have already pulled the valve covers and everything looks to be in place and the rockers seems to be moving fine when I crank it. However the engine has ran at least 15 times now (about 2 mins max, I have no cooling system until I get my pipes ran to the rad. in the bed) and there is an extremely small amt. of oil in the top end. Most of it looks dry.The guage is showing adequate oil pressure. ???

 

Compression check was good. I tried to do a C.A.S.E. relearn, but nothing happened. It didn't prompt me to do anything. I tried raising the RPMs to 4000 but nothing seemed to happen. There are multiple dtcs present because I havent finished my wiring. MAF and some trans DTCs. Maybe thats why it wont relearn? If this isnt it I'm gonna burn the truck, haha. The plugs fire when I pull them out, and they are wet. It doesnt seem to back-fire like the spark is out of time. Also I pulled up a PID that says crank angle sensing error and it says no. Any other suggestions other than buy a real chevy?

 

Ya, the software does not offer any feedback to let you know that the learn is working. That needs to be fixed. The only way to know that it worked is if it cuts out when you rev it up. Once you hit the learn button, a change in the state of the brake switch(stepping on the pedal) activates the learning process.

Get the wiring finished and then see how it runs/what DTCs are set.

 

Thank you very much. I will have to pin a wire for the brake switch tonight.