Knock, Knock...Who's there? Your Engine mother******
#76
thank you, but if you had read through the thread, we've done all that. all the injectors have been replaced along with the fuel pump, and the car was retuned after the knock started. race gas and still knocking signals false knock to me. along with knock voltage not moving even when the logs show 25 counts of knock or more. i've been monitoring the coolant level for 3 weeks and there has been no change. i am trying to find out why the cylinder is clean. that's what i need help with. there are no signs of a head gasket leak, or real knock. spark plugs all look good, compression across all 4 cylinders was good. lean spool is disabled.
i didn't say AFR's aren't important, they aren't the issue though because they have been checked, tuned, checked, and retuned, and checked again. the AFR's aren't causing the knock.
also, i've run a tune just to see what would happen with less than stock boost, and just about all timing pulled, and the damn thing still knocked.
the only thing that has helped the knocking is the cleaning up the engine bay...for example, I rubber mounted the grimmspeed 3 port BCS, moved a lot of piping around so it wasn't touching anything else, etc. knock went from 25-30 counts of knock on EVERY run down to around 8-10. then I removed a rattling Ingalls stiffy and the knock went down to 4-5 counts. I can still hear some rattling under the hood, and a slight exhaust leak developed, so something is loose.
the ONLY thing that looks at all out of the ordinary is that one damn cylinder being clean. nothing else points to real knock but that.
i didn't say AFR's aren't important, they aren't the issue though because they have been checked, tuned, checked, and retuned, and checked again. the AFR's aren't causing the knock.
also, i've run a tune just to see what would happen with less than stock boost, and just about all timing pulled, and the damn thing still knocked.
the only thing that has helped the knocking is the cleaning up the engine bay...for example, I rubber mounted the grimmspeed 3 port BCS, moved a lot of piping around so it wasn't touching anything else, etc. knock went from 25-30 counts of knock on EVERY run down to around 8-10. then I removed a rattling Ingalls stiffy and the knock went down to 4-5 counts. I can still hear some rattling under the hood, and a slight exhaust leak developed, so something is loose.
the ONLY thing that looks at all out of the ordinary is that one damn cylinder being clean. nothing else points to real knock but that.
You don't think it's an A/F issue. ...what are your AFRs? What are they supposed to be?
Do you have Lean Spool disabled?
I think the 1 clean piston is fishy...what's up with that?
I don't know what would cause that but I think that's what you should be looking into.
An obvious mechanical problem. Running the race gas and continuing to knock only rules out too much advance...right?
If there is a mechanical problem (HG leak, bad injector, bad fuel pump etc.) Then all the race gas in the world won't cure it ya know?
Just throwing some ideas out there man.
Do you have Lean Spool disabled?
I think the 1 clean piston is fishy...what's up with that?
I don't know what would cause that but I think that's what you should be looking into.
An obvious mechanical problem. Running the race gas and continuing to knock only rules out too much advance...right?
If there is a mechanical problem (HG leak, bad injector, bad fuel pump etc.) Then all the race gas in the world won't cure it ya know?
Just throwing some ideas out there man.
#78
at the time of the original tune, the car did not knock at all. it didn't start until I got home (8 hour drive). it's hard to pinpoint, but it seemed like it didn't do any knocking until after the first time I was able to smell that exhaust leak. I'm thinking something came loose, or a gasket started leaking/blew out, and is allowing the pipe to leak/rattle. i shouldn't have ANY exhaust leaks under the hood because ALL of the exhaust components are brand new. this issue will be addressed in a week or two when it's down for the timing belt job.
I plan to do another compression check because the car wasn't full warmed up yet when I did the first one.
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