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S_aujp_v3

I keep getting 10 degrees of retard from 3200 - 4200 rpm with kpa values in the 95+ range. I've since pulled a total of 15 degrees in that area and am still getting 10 degrees of retard. I've pulled 5 degrees 3 times.
What gives? My WB02 readings in that area are 12.5 & 11.9.

 

Did you reset the computer after pulling timing each time? I beleive it could be the result of residual "learned" values.

Plus I seem to remember if your AFR is lean when you go WOT then it stays lean during WOT but the WB doesn't seem to indicate that so N/M.

Does this happen only while WOT?

 

What do your plugs look like? Are there little black specks in the insulator?

 

Yes. Only WOT. So even though i'm pulling the eeprom and reprogramming it, I still need to pull the fuel pump/ecm fuse to reset the ecm? I take it that the "memory" is on the memcal and not the eeprom?

I just pulled 4 of my plugs, 2 in each head, to check 'em out. They look brand spanking new. There are only ~150 miles on them at the moment. I'm actually thinking that i'm on the threshold of being lean. According to my datalogs I am a bit lean in some areas. I was hoping they'd be at least a tad bit tan. I know there's a plug reading thread around here somewhere. I'll find it.

 

How are you tuning WOT? Are you using a WB? just a hunch but I'll bet you're running too lean which is why pulling tiing isn't helping much.

 

Yep. Running WB. I want to lean it out a bit up there but the timing issue is preventing it. I'm looking to get about 13.3 or so at WOT.

 

Since you have adjusted the timing that much...try adjusting the A/F ratio. Also, have you checked to see if your headers/exhaust is hitting the frame causing false knock.

 

I'll check the A/F ratio. I just had the final clearancing and welding done for my headers. There's no more chance of exhaust hitting issues.
I just did a short blast yesterday in those ranges and had only 6 degrees of retard. All I did differently was pulling the ECM fuse and it was the first blast after the header clearancing.

 

I would lean it out some and make sure your exhaust still ain't hitting when the engine torques at WOT.

How about the valvetrain...is it noisy and do you have a lot of piston slap?

 

I had a problem once where my knock sensor wire was picking up interference from the plug wires thru the dipstick tube. I had recently installed headers and had wrapped the signal wire around the tube to keep it off the primary.

 

I do have an exhaust vibration somewhere. Haven't been able to find it yet. Of course it stops as soon as I hit the floor.
Haven't been able to mess around with the retard much lately. The car's surging issue suddenly went to the extreme south. To the point of 800rpms. Bad at stoplights. Died a couple of times. I believe that surge is finally gone. The replacement Ostrich AND the new distributor shaft seems to have limited my surge to 50-100rpm. I'm getting there.

My KS wire is behind the starter.