i am having a similar prob w/mine. since i put the milled 243's on my truck i can only run about 24* of timing before i get ping. my knock sensors don't pick anything up either. i am at a loss also! will stay tuned to see what you come up with.

 

Had to crack open the T/B blade a little so it wouldn't die but I would say it idled fine..Closed it back to normal and correct TPS so it's idleling pretty good right now, no idle issues.

 

Just added a NOS fuel additive and took her for a spin. Did several WOT's and no pinging with the higher octane and left the time at 27-26. I may still run her tomorrow to see how she does ??????.

 

Man that sucks. Are you sure all the injectors are functioning properly? Are the rails flowing like they are supposed to be?

 

Injectors seem to be fine, duty cycle around 70. My fuel trims are also ok.
This is getting crazy and my rear tires have lost 1/2 their life from all the road testing LOL......good thing I'm only hammering it from above 55-60mph LOL.

 

Just got back from the track, Bad and good news "I guess". On the way to the track I picked up my tuner (Dan rgvsierra) and he noticed the truck didn't sound right to him at normal driving, oh well, I said that's how it sounds and we left it at that. Right as I was getting ready to run I got a "service engine" light. Ran it anyways and it ran 12.47 @ 108 w/1.73 60'. The service engine light went away so I kept on running the truck, couldn't do any good burnouts "crappy track prep" or "not enough *****" maybe a combo of both LOL. Anyways, truck ran 3 12.47's with 2 1.71's 60's and 1 1.73 60 spinning like a **** and a 12.58 w/1.76 60, some traction issues....no biggie....mphs being 86-87 1/8th and low to high 108's 1/4's, so she was very consistent. Those were the bad news I guess. The good news is once we got home, Dan hooked up the laptop and looked at the history to find this code "PO200 Injector Circuit Control". The pinging is on my side so this indicates that maybe one of my injectors is not working right. I checked the one I suspect cause I never took the time to fix one of my connectors that I am almost sure is not making good contact. I pulled the connector and plugged it back in but I will have to fix it tomorrow. I am hoping that's the culptrit of this mess. Thinking its just making anough contact to get by. After I left Dan's, the truck felt a little worse "bucking" so I sure hope this is my problem. It's on the side that pings and it's the one I think not making good contact and looks like one of the pins is further inn back so the intake swap might have made it worse by making less contact from that one pin. I sure hope this is the problem and not just sometheing else on top of what I already have. I'll know more here in a day or two, at least I have something to really look at and not shoot in the dark.

 

Hope you get it worked out man!

 

That sounded like it could have been the issue

 

So far, it looks like that was the problem. Put in a new connector last night and put new gas in, truck doesn't seem to ping anymore. I'll know for sure in a couple of days cause I also found out why it couldn't do the burnouts and was hopping so bad and spinnig only one tire causing the conv. to lock and pull....my drivers side flip kit u-bolts loosened up, so I need to replace the nuts and run double nuts cause this had already happened. We'll see how it goes...

 

Any more updates?




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