Major hesitation issues in a 98Z
Thread Starter
Joined: Dec 2001
Posts: 90
Likes: 0
From: Saskatoon, SK, Canada
Major hesitation issues in a 98Z 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..
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..
Thread Starter
Joined: Dec 2001
Posts: 90
Likes: 0
From: Saskatoon, SK, Canada
Originally Posted by WS6FirebirdTA00
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
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.
Thread Starter
Joined: Dec 2001
Posts: 90
Likes: 0
From: Saskatoon, SK, Canada
Originally Posted by P Mack
Any misfires? What is the maf reading at redline, wot?
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Thread Starter
Joined: Dec 2001
Posts: 90
Likes: 0
From: Saskatoon, SK, Canada
Originally Posted by P Mack
Any misfires? What is the maf reading at redline, wot?
Any ideas on what else to check??
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