CK-1 99SS

iTrader: (3)

I am trying to help a friend figure out what is wrong with his car.. The car is a bone stock 98Z28 6spd with a K&N filter. The car has extreme hesitation when going anything over 1/4 throttle. If you take the car up the RPM's without lots of throttle it isn't that bad. I thought it would be the MAF all oiled up from the K&N but I deleted it with my HPTuners and it still runs like garbage. I replaced the front o2's and fuel filter as well. What else could I check?
I have HPTuners and logged some runs with and without the MAF. Fuel trims are relatively at 0 at part and WOT and there is the infamous 3 degrees knock at the higher rpm's. AFR is around 900mv's and spark is around 24-25 degrees. I was expecting to be given a clue when I did some logging but the numbers look good relatively.. This ar seems like it has lost at least 100hp easy..
What should I be logging to see if it is out of whack and what else should I check/change?

Thanks for the help..

WS6FirebirdTA00

iTrader: (33)

bent push rod? did you run the car in sd? and did you tune it after you did that? how did you diable the maf? first things that come to mind are o2's, maf, pushrod

CK-1 99SS

iTrader: (3)

I ran the car in SD but I did not tune it after that because the LTFT's and STFT's were around the 0 mark and the AFR was around 870. I disabled the MAF by setting the sensor fail frequency to 0.
Would you be able to hear a bent pushrod and would it seem like the car lost most of its power from that? There is no noticable sound coming from the engine bay.

WS6FirebirdTA00

iTrader: (33)

my friends 98 t/a made no engine noise at all and its #2 cyl had a busted intake pushrod

CK-1 99SS

iTrader: (3)

Is there anyway I can log any PID's beforehand before I take them out to check?

P Mack

iTrader: (6)

Any misfires? What is the maf reading at redline, wot?

CK-1 99SS

iTrader: (3)

No misfires.. I am not sure what the MAF is reading at WOT. I will have to check next time I see him.. It ran the same in SD mode without the MAF as well.. I am stumped

CK-1 99SS

iTrader: (3)

Maf reads 26.27lb/min@5320rpm at WOT and climbs from 1lb/min@775rpm to WOT reading on a smooth curve..

Any ideas on what else to check??

ringram

Hey there, did you get to the bottom of this yet?