Blackened87
New Member
- Joined
- Jun 21, 2016
- Messages
- 13
So recently I picked up a 87 GN and I had a issue where it would bog out above 5psi of boost. Well a new fuel filter solved that issue. Now it will build almost 15psi of boost but The engine goes flat at 4K rpm. No timing retard on the scanmaster and no popping or any abnormal noises, just gets to 15psi and don't do anything.
I changed the plugs, wires, module, and a new delco coil so I covered all the ignition stuff, I also replaced the fuel pressure regulator and the ECM since my scanmaster wasn't communicating. Normal driving around its fine and has plenty of power under 15psi, it's when I push it that it loads up and won't accelerate past 4K.
MAF counts are 7 at idle with the engine running. I was planning on unplugging it and see if I can push it harder. The engine has a little over 100K miles on it and most parts are original except what I just recently replaced.
Does this sound like a bad MAF, or a clogged cat or weak valve springs? I was planning on doing the valve springs next week, but I wonder if I have something else to check out as well.
Thanks for any info.
I changed the plugs, wires, module, and a new delco coil so I covered all the ignition stuff, I also replaced the fuel pressure regulator and the ECM since my scanmaster wasn't communicating. Normal driving around its fine and has plenty of power under 15psi, it's when I push it that it loads up and won't accelerate past 4K.
MAF counts are 7 at idle with the engine running. I was planning on unplugging it and see if I can push it harder. The engine has a little over 100K miles on it and most parts are original except what I just recently replaced.
Does this sound like a bad MAF, or a clogged cat or weak valve springs? I was planning on doing the valve springs next week, but I wonder if I have something else to check out as well.
Thanks for any info.