Rick Speed

iTrader: (55)

I put a 408 in my 1998 Trans Am. It ran great did some sick street pulls with it. I had the adaptives close enough to be safe. Dropped it off to be tuned and the tuner just called me and said no matter what he does on the dyno the car shuts off at about 6000rpm. I'm hoping for a bad crank sensor but idk.

455GTO

iTrader: (18)

I had a similar issue where it would misfire at 6k... And if you stayed in it the tach would die. Ended up being the crank sensor and was a quick fix but very frustrating because it never threw any codes

Rick Speed

iTrader: (55)

Yeah I'm going to try that first. I read a thread from last year that wound up being a loose connection at crank sensor. Thanks for the reply.

Rick Speed

iTrader: (55)

Well crank sensor didn't fix it. What else could it be?

455GTO

iTrader: (18)

It could be a number of things but I did read a few threads where the reluctor wheel was bad and/or the crank run out was too far out of spec causing the crank sensor to not read the wheel any longer. People complained of their car shutting off when this happened. If all else fails, you might want to pull the motor and inspect the reluctor wheel and crank run out.

subeone

iTrader: (5)

^^ what 455 said pretty much...too much endplay more than likely. could be a result of balloning converter, the reluctor wheel moves just enough so that the crank doesnt pick it up and cuts all function i.e. fuel and spark

Rick Speed

iTrader: (55)

I'll have to give the reluctor wheel a good look. It's a forged crank with a yank convertor so I don't think those are problems. I've had this convertor for a few years. The crank is new from TSP and my engine builder is top notch so the wheel seems to be the most likely place to look.