Retarding timing.. why??

[Corman12345]

what would cause timing to retard under heavy load and at boost from 6-15 psi. I don't think its knock either.
What signals does the ECU process in order to determine timing

thanx

 

[Keaka26]

Timing retard generally only happens with knock. What makes you think its NOT knock?

 

[Corman12345]

because it just started doing this all of the suddon

 

[Keaka26]

check for knock inducing boost leaks then...

If you run rich enough from boost leaks, you will get knock, then comes the timing retard =)

 

[Corman12345]

I just did a pressure check and everything is fine, no leaks.

 

[Keaka26]

got any signs of lifter tick? maybe you have phantom knock?

Also, try dumping in some high octane fuel and running that, see how your timing is after that.

 

[benchandler]

I Agree with the high octane fuel. Once my car was totally empty and my girlfriend took it to a superstore gas bar (dont know if you guys got em in the states, they are like a walmart) and filled it up with their premium. The car ran like total sh*t, retarted timing, but no audible knock or pings. Anyway, I tossed in some octane boosters in and it helped, after I burnt that tank down to half and put some good stuff in, it seemed to work fine.