curt-s
Supporting Member
- 2,408
- 1,136
- Dec 21, 2008
-
Winnipeg,
MB_Canada
Been a while since I started a thread, but here goes because short of changing to another set of stock cams, rebleeding every HLA yet again, and ripping out the knock sensor wiring and redoing the harness, I am really confused.
It all started with this year's no-start. Turned out likely to have been due to a bad battery not turning over the motor fast enough or giving enough amperage to the coils, I did end up taking the head off due to really weird compression numbers. Car previously had 165 across the board only a few years ago and now I was getting between 90 and 120, and redoing the belt caused all sorts of changes. Yet, it never started, even though a motor with 120psi would start fine.
Anyway, head off, new exhaust valve guides, new seats cut on I/E, and finally put in a brand new set of BC valve springs & retainers because I was still running the stockers. In fact, I think the slow spring return rate may have actually caused flat spots on the lobes due to float. Hence why I *might* change cams.. but I still don't think that would solve all of what I have. All HLAs were bled when I put it all back together. Just bled, didn't clean them with diesel fuel because I figured it wasn't necessary as they only had about 26k km on them. Perhaps I have some that aren't staying pumped up.
Ever since I put it all back together, I've had this fairly regularly occuring knock above my ignore threshold of 3000/30% up to about 3500. Usually only .4-.7 counts that hang around for a while then go away on their own, sometimes a spike to 1.1 but below 3K with the thresholds disabled it's anything-goes. Pulled the plugs and they're flawless (but also basically new).
So I took a rawknock log and saw a MASSIVE amount of noise but it's also inconsistent, and one instance in particular caught my eye.
I've never seen rawknock like this all over the place. No balance shafts, 2.0 stock pistons/rods/crank. 2500rpm ought to be about 50-55psi oil pressure. -20inHg at 850rpm idle. That period of low activity is around 12.2s.
The odd thing is even though I don't speed up at all it just suddenly goes crazy. I've retorqued the sensor; it's a 2G on a 2G ECU. There is zero knocking sound coming from the motor itself though I'm not entirely convinced it's not the HLAs because they tick more now than before I pulled everything apart.. but the last time it ran before I did was last year. Runs strong, just went through a couple oil changes already with no flakes in the oil or filter..
Attached the log.. also have a miss I can't tune out even with injector deadtime but I haven't sent them to be analyzed or matched. Not sure how prevalent that is with a 2G ECU with only a 1G CAS.
Perhaps I just need to pull the HLAs again, fully clean them as best I can and use the other set of cams if they've got better lobes but has anybody seen this behavior before? I also redid my alt wiring and added an alt ground and a few more heavy chassis grounds. Wouldn't it be funny if I ended up making the sensor more sensitive in doing so.
It all started with this year's no-start. Turned out likely to have been due to a bad battery not turning over the motor fast enough or giving enough amperage to the coils, I did end up taking the head off due to really weird compression numbers. Car previously had 165 across the board only a few years ago and now I was getting between 90 and 120, and redoing the belt caused all sorts of changes. Yet, it never started, even though a motor with 120psi would start fine.
Anyway, head off, new exhaust valve guides, new seats cut on I/E, and finally put in a brand new set of BC valve springs & retainers because I was still running the stockers. In fact, I think the slow spring return rate may have actually caused flat spots on the lobes due to float. Hence why I *might* change cams.. but I still don't think that would solve all of what I have. All HLAs were bled when I put it all back together. Just bled, didn't clean them with diesel fuel because I figured it wasn't necessary as they only had about 26k km on them. Perhaps I have some that aren't staying pumped up.
Ever since I put it all back together, I've had this fairly regularly occuring knock above my ignore threshold of 3000/30% up to about 3500. Usually only .4-.7 counts that hang around for a while then go away on their own, sometimes a spike to 1.1 but below 3K with the thresholds disabled it's anything-goes. Pulled the plugs and they're flawless (but also basically new).
So I took a rawknock log and saw a MASSIVE amount of noise but it's also inconsistent, and one instance in particular caught my eye.
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I've never seen rawknock like this all over the place. No balance shafts, 2.0 stock pistons/rods/crank. 2500rpm ought to be about 50-55psi oil pressure. -20inHg at 850rpm idle. That period of low activity is around 12.2s.
The odd thing is even though I don't speed up at all it just suddenly goes crazy. I've retorqued the sensor; it's a 2G on a 2G ECU. There is zero knocking sound coming from the motor itself though I'm not entirely convinced it's not the HLAs because they tick more now than before I pulled everything apart.. but the last time it ran before I did was last year. Runs strong, just went through a couple oil changes already with no flakes in the oil or filter..
Attached the log.. also have a miss I can't tune out even with injector deadtime but I haven't sent them to be analyzed or matched. Not sure how prevalent that is with a 2G ECU with only a 1G CAS.
Perhaps I just need to pull the HLAs again, fully clean them as best I can and use the other set of cams if they've got better lobes but has anybody seen this behavior before? I also redid my alt wiring and added an alt ground and a few more heavy chassis grounds. Wouldn't it be funny if I ended up making the sensor more sensitive in doing so.