I recently replaced my alternator and serpentine belt - 63.5". I have ~69k miles on the car. First I took my car for a cruise, primarily to check and make sure alternator was regulating correctly. So my Scanmaster was displaying BVatt the entire time. I then took my car out again and with Scanmaster on the default setting and I noticed spark retard when doing normal driving. Finally I put the car in park and I was still able to induce knock. There is also engine noise that has gotten worse over time, I can't audibly locate it. Here are the things I have checked so far.
1. So I double check the alternator and make sure it is bolted down.
2. Removed the serpentine belt and checked tensioner pulley, and the other pulleys and they all appeared to in working order.
3. I've double checked all the bolts I could get to.
4. I've replaced my ECM with a known good one
5. I've replaced ESC module with a known good one
6. I've removed the "trans shield" and I took at look at the converter and flywheel, while the car was running and in and out of drive and I didn't see anything or hear any noise. I checked to see if there were any loose bolts and didn't see any.
I'm sure that I've checked other things, but nothing seems to be making a difference. As I mentioned, there is noise from the engine that has gotten progressively worse, you have to rev the engine to hear it, and I believe that is what the knock sensor is detecting.
I have owned the car for about a year and half now and I did manage to blow a head gasket in oct of 08 at about 68k miles. I took it in to Aggressive Performance and had the Champion Heads and intake ported along with new cometic gaskets and ARP studs put in. Prior to blowing the gasket, there was never an issue with excessive engine noise or anything else. Car ran like a dream. After the head gasket blew, it has been all down hill.
I don't have too much experience with working on cars, especially not engines, so I'm still learning. So I also ask for patiences.
Any suggestions would be greatly appreciated.
Also, does anyone know of good engine person for these cars here in Southeast Michigan?
Thanks,
Charles
1. So I double check the alternator and make sure it is bolted down.
2. Removed the serpentine belt and checked tensioner pulley, and the other pulleys and they all appeared to in working order.
3. I've double checked all the bolts I could get to.
4. I've replaced my ECM with a known good one
5. I've replaced ESC module with a known good one
6. I've removed the "trans shield" and I took at look at the converter and flywheel, while the car was running and in and out of drive and I didn't see anything or hear any noise. I checked to see if there were any loose bolts and didn't see any.
I'm sure that I've checked other things, but nothing seems to be making a difference. As I mentioned, there is noise from the engine that has gotten progressively worse, you have to rev the engine to hear it, and I believe that is what the knock sensor is detecting.
I have owned the car for about a year and half now and I did manage to blow a head gasket in oct of 08 at about 68k miles. I took it in to Aggressive Performance and had the Champion Heads and intake ported along with new cometic gaskets and ARP studs put in. Prior to blowing the gasket, there was never an issue with excessive engine noise or anything else. Car ran like a dream. After the head gasket blew, it has been all down hill.
I don't have too much experience with working on cars, especially not engines, so I'm still learning. So I also ask for patiences.
Any suggestions would be greatly appreciated.
Also, does anyone know of good engine person for these cars here in Southeast Michigan?
Thanks,
Charles
