NO KNOCK 1,2,3, but 4TH KNOCK

[AMRCNBA]

1st 2nd 3rd gear wide open throttle, no knock. 4th gear gives me 3 to 4 degrees worth. Spits sputters, everything, timing drops. The car acts like it's running lean, but at wide open throttle the O2 sensors are reading .923 or higher. Mods in siignature.

I've got the pe tables multiplied by 90%. Mods in signature.

[JandJsTA]

Welcome AMRCNBA, would you happen to have a log of one of your runs or know someone that can run you a ATAP/EFIlive log that we could look at .. it certainly sounds like you may be running out of fuel even though you say your O2s are running 925 (stock injectors?) .. the O2s are not always the best way to tell what is happening at WOT.... if you have a log try and include injector duty cycle to see if the injectors are getting maxed :) (just one thought)

[AMRCNBA]

The board says I can not post attachments, so how do I include one of my log files?

I've got more than few, but no idea how to load them up so you can view them.

[JandJsTA]

Originally posted by AMRCNBA
The board says I can not post attachments, so how do I include one of my log files?



At the bottom fo the new post box there is not a "file attachment box" ??? I will follow up with the admins :)


EDIT: unfortunately that feature has been turned off for now.. send it to me and I will post it up J&JsTA (JandJsTA@sympatico.ca) :)

[eboggs_jkvl]

Attachments are on in the tech forums now.

E:)

[jimmyblue]

Only a theory:

Lower gears let the engine run up faster. The spark calc
will be "less late" in higher gears. So in 1, 2, 3 you may
effectively get less timing (because static timing, it ain't).

Can you review your logs and see if (say) the actual advance
at 5000RPM in 4th is higher than 5000RPM in 3rd than 2nd...