I've been getting this part-throttle knock since I bought this car, and I've tried everything I can think of, to no avail. Usually, it's less than 5 degrees, sometimes goes higher though. It's like usually when I'm changing lanes, going up a hill or something, but far from WOT. Sometimes, I can hear the pings too, so it's not false knock.
Used to be, KR would go away when I really got in it all the way to WOT. Lately (past month), the KRs seem to hang around longer than before, sometimes even when I'm at WOT. It's been colder here lately, and I recently have gone to biggest propane nozzle to overcome colder propane tank - those are the only recent changes.
Engine has about 60K on it - FPR is set at 48psi (line off), boost recently lowered from 22 to 17 since KRs have worsened. Translator still set to 8% rich at WOT. I have experimented with Propain turn-on point, DC, and nozzle, but nothing has improved (with propane, I can generally run higher boost of course, but part-throttle KRs remain). 02s show about 790-800 when KR is highest - I don't know whether to trust that with the propane, have bought an EGT gauge, but not installed yet.
Suggestions I had heard so far, have been addressed:
EGR is working. RJC Power Plate installed. Catch can in PCV circuit to prevent most of oil to intake. GM Top Engine Cleaner used recently, no noticeable difference.
Other suggestions I haven't verified are: Cracked Header? Cam lobe wearing out?
I had a 28* Thrasher in there, but have recently switched back to an 18* chip, then to stock chip, and although total KR is less now, it's definitely still there.
Very frustrating - the car still pulls pretty good, but I'm afraid to get into it too much, lest I break something and be really sorry.
Anyone else have these symptoms, or have any suggestions? Thanks, and Happy Thanksgiving.
Confounded
Used to be, KR would go away when I really got in it all the way to WOT. Lately (past month), the KRs seem to hang around longer than before, sometimes even when I'm at WOT. It's been colder here lately, and I recently have gone to biggest propane nozzle to overcome colder propane tank - those are the only recent changes.
Engine has about 60K on it - FPR is set at 48psi (line off), boost recently lowered from 22 to 17 since KRs have worsened. Translator still set to 8% rich at WOT. I have experimented with Propain turn-on point, DC, and nozzle, but nothing has improved (with propane, I can generally run higher boost of course, but part-throttle KRs remain). 02s show about 790-800 when KR is highest - I don't know whether to trust that with the propane, have bought an EGT gauge, but not installed yet.
Suggestions I had heard so far, have been addressed:
EGR is working. RJC Power Plate installed. Catch can in PCV circuit to prevent most of oil to intake. GM Top Engine Cleaner used recently, no noticeable difference.
Other suggestions I haven't verified are: Cracked Header? Cam lobe wearing out?
I had a 28* Thrasher in there, but have recently switched back to an 18* chip, then to stock chip, and although total KR is less now, it's definitely still there.
Very frustrating - the car still pulls pretty good, but I'm afraid to get into it too much, lest I break something and be really sorry.
Anyone else have these symptoms, or have any suggestions? Thanks, and Happy Thanksgiving.
Confounded