MemeMachine Posted June 5, 2022 Share Posted June 5, 2022 G'day guys, I'm having a rather significant issue with false knock. Before I get too far I have knock ears (kind of ghetto ones, but can definitely clearly hear knock when it is actually knocking). Regularly pulling out 8 degrees up a hill at a load of 0.5-0.65 (still well within vacuum). Generally pulls a fair bit of timing under load (4 degs) but I've got it running super rich (about 0.8 lambda in boost) and timing has been set to 6 degs in boost, yet is still pulling timing sometimes into the negatives. Any ideas where to start? Tried thicker oil and it did have some improvement, but thinking potentially dud knock sensor? P.S I have very significantly detuned the knock sensors, which has improved it but there areas that are still terrible! Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted June 5, 2022 Share Posted June 5, 2022 Put a mic in the engine bay and some headphones on. You might have something like a intercooler piping banging on the chassis setting it off. Quote Link to comment Share on other sites More sharing options...
Rob Posted June 5, 2022 Share Posted June 5, 2022 1 hour ago, MemeMachine said: G'day guys, I'm having a rather significant issue with false knock. Before I get too far I have knock ears (kind of ghetto ones, but can definitely clearly hear knock when it is actually knocking). Regularly pulling out 8 degrees up a hill at a load of 0.5-0.65 (still well within vacuum). Generally pulls a fair bit of timing under load (4 degs) but I've got it running super rich (about 0.8 lambda in boost) and timing has been set to 6 degs in boost, yet is still pulling timing sometimes into the negatives. Any ideas where to start? Tried thicker oil and it did have some improvement, but thinking potentially dud knock sensor? P.S I have very significantly detuned the knock sensors, which has improved it but there areas that are still terrible! Are u running external gate 1 Quote Link to comment Share on other sites More sharing options...
MemeMachine Posted June 6, 2022 Author Share Posted June 6, 2022 14 hours ago, Roland@pcmtec said: Put a mic in the engine bay and some headphones on. You might have something like a intercooler piping banging on the chassis setting it off. I'll double check, but looks all fine to me. Plus shouldn't I pick that up on my knock ears? Quote Link to comment Share on other sites More sharing options...
MemeMachine Posted June 6, 2022 Author Share Posted June 6, 2022 13 hours ago, Rob said: Are u running external gate Nah internal ts gate, only on 7psi Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted June 6, 2022 Share Posted June 6, 2022 49 minutes ago, MemeMachine said: I'll double check, but looks all fine to me. Plus shouldn't I pick that up on my knock ears? That's why I said microphone instead of knock ears (turn off all filtering if your knock ears let you). Your knock ears probably have different filtering than Ford use, they are also not attached in exactly the same place. So there might be drive train banging, suspension, pipework, engine mounts or piston/rotating assembly noise that is getting picked up as knock that you can't currently hear. Quote Link to comment Share on other sites More sharing options...
MemeMachine Posted June 6, 2022 Author Share Posted June 6, 2022 6 hours ago, Roland@pcmtec said: That's why I said microphone instead of knock ears (turn off all filtering if your knock ears let you). Your knock ears probably have different filtering than Ford use, they are also not attached in exactly the same place. So there might be drive train banging, suspension, pipework, engine mounts or piston/rotating assembly noise that is getting picked up as knock that you can't currently hear. Alright cheers ill give it a go. All sounds and seems good at a glance though. Anywhere else i should look in the case I don't hear anything? Quote Link to comment Share on other sites More sharing options...
overlap Posted August 18, 2023 Share Posted August 18, 2023 On 6/6/2022 at 8:11 PM, MemeMachine said: Alright cheers ill give it a go. All sounds and seems good at a glance though. Anywhere else i should look in the case I don't hear anything? How did you get on? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.