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I converted from an 0411 to a p59 pcm for flex fuel on my vehicle. I found a file from an 04 tahoe that had flex fuel enabled. It was a 12587603 os number. so my tuner used some gm cable to flash my...

Thank you for the video tip. I watched it and adjusted my timing in those areas and my bucking was about 40% less than what it was. still needs more but I'm afraid it might be down to the iacv and...

i have a 416 ls3 with tfs 235 heads, holley 95mm throttle with low rpm taper, fast 102, cam has 21.5 degrees overlap. It's on an 02 camaro ss ecu tunes in SD. when i am in 1st or 2nd gear at 1600 to...

i feel like i've checked that before but its been a year so i could be wrong . i've had logs in here when its happening. anything i can log to try and see that before i pull the header and starter to...

bump edited last post with new info

I bought another pcm from a 02 Camaro and started the tune from scratch. It still only revs to 6400 rpm but doesn't die out anymore. just backfires when it hits the cut. almost like its cutting...

Ok I will thank you. My car makes 559 rwhp so I'm questioning if this fuel system set up can keep up. I'm scared to do a longer pull for fear of damaging engine. I'm surprised I have t damaged the...

I'm watching the fuel pressure from inside the car it's an automete pressure gauge so I know it's not dropping out. I thought I did mention earlier that the fuel pressure wasn't dropping out. I've...

Well something is definetly not right. It's running stupid lean. It went up to 16:9 afr at WOT when the cut happens. But the ve map has a lot of fuel. I wonder what's the limit of the return less...

here is a longer log with 2 brand new o2 sensors. The o2 sensor MV are still low. It's weird because in some parts of the map it's showing lean like 100-200 mv but stft are still commanding negative...

I don't know why my tuner set them up like that. At 3 bar they are 52 lb injectors but gm runs 4 bar so it's 58 lb.
This set up is in my 1997 Nissan 240sx. But my whole setup from trans to wiring...

Let me rephrase that I was not the one logging so none of the logs were kept. On the injectors I know they are rated for 58lbs at 4 bar. They are same injectors the 2014 gt500.

Ok thank you for the explanation. I do have a fuel pressure gauge on the rail and it never goes below 55 psi during the pull. Unfortunately no logs were taken during the dyno. I'll try and get a wide...

i just looked at the log again and it looks like the cam signal stops moving at 4200 rpm till it hits the problem then goes back down to 4200 rpm and starts moving again under that. The cam signal is...

ok with that said i have absolutely no idea where to go from here. everything else looks to be good nothing is dropping out or losing signal.I can't find anything in the tune like a rev limiter that...

I hear you. I'm gonna replace both o2 sensors and do another log . So I'm assuming the ignition voltage is not an issue?

yes i have an extra o2 bung on my pipe and we used the dyno wide band to tune it. it was going good afr's were in the 11:8:1 to 12:2:1 are for the whole tune while this issue was happening. Then all...

ok what should the MV be at full throttle ? i hope i didn't damage this engine. It's a built engine i hope it's ok.

How about the ignition voltage ?

also thank you for your input so far.

i made a log this morning. only thing i see a little weird to me is the ignition voltage drops down to 10.5 volts when I start the pull. Is that normal ?

No it does not set any codes. I'll get some logs tomorrow. Crank sensor didn't drop out when I scoped it.

The reluctor is 24x no conversion box. My valve springs were checked and machinist said they are good. Springs are more than capable of handling the cam. But like you said at this point it could be...

hello i'm new to this forum I have an issue with my vehicle and hoping anyone here can help me. i'm sorry in advance if my post is not correct. any pointers on how to make a better post next time is...