Im getting an engine light on my car and yet i get no code, ever sensor on the car is new and iv replaced the MAT again because a code said it was bad and now thats fine, but the car has 87 TPI electronics. im starting to think it has something to do with the custom chip john M did for me, it starts hard and im not sure if the timing is off but if i step on it once in a while in neutral itll pop out the intake, thats what makes me think it has something to do with the chip. but if anyone has any info on what could possibly be the problem, the car wont idle on its own until it gets up to temp then itll barely stay running.

 

Datalogs are about the only thing that can be used to really diagnose a custom chip. Rich/Lean, spark, etc., all show in the logs.

As for the check engine light, it could be the customizing in the chip. For example: A WB O2 sensor hack steals that memory location and causes the light to come on. Don't know if yours has that hack or not. You really need to be talking to whoever did your chip about that.

Sorry I couldn't be more help..... but at least I didn't say "DO A SEARCH"

 

lol thanks, ill have to get ahold of jon about this. im not sure if i can use a data log on my car i have 2 wires not in my ALDL port, ill have to put them in if i can figure out which port they went in.

 

There is also the possibility of it being in limp home mode. Does the fan run all the time(if equipped with ECM controlled fan).

 

No i ran 12.68 with it that way. and at the time my TPS wasnt set and my MAT was bad and it hessitated bad after i shifted each time. fans arent on all the time.

 

also i am wondering i had John M redo my chip(take out the EGR and CS) if he also changed the timing tables and fuel tables as well? im kind of doubting it now. im sending it back to him and im going to ask for the specs on it.

 

Without seeing the chip myself, there's no way I can answer that as I'm sure you know. Good luck, hope he keeps helping you out on that chip!

 

he said its possible i have or had a v6 chip or programed to one or something......blaaaaah!

 

Not if you ran a 12.68 with it!!! It would have to be a lot closer to what you really need than that! Just my opinion anyway...

 

i sent it back to him so who knows whats going to happen.....