Hey all. Now that the weather is getting nicer up here, I've been able to drive around with the roof off, windows down and really listen to the 7m run.
I've noticed when I am driving near a curb it reflects the sound really well and I believe I am hearing detonation. I'm familiar with the sound so I'm pretty sure that is what I'm hearing. It's like a random but frequent "ticking" or "clicking" from the engine on semi to high load, part to full throttle.
I haven't checked the timing yet since I replaced the head gasket, so I'm assuming I put the dizzy back in with a little too much advance??? The 7mge has a knock sensor, but how much does the ecu rely on it?
Also I'm running 87 fuel and wondering if I need to run 89 instead? Will have to try that after I check/adjust the timing and find that doesn't help.
One other thing; stock compression on the 7m should 160 if I recall. I tested mine at 180 across the board. I attributed that as a result of the carbon/deposit build up on the combustion chamber of the head and on the tops of the pistons, which I found when I pulled it apart to do the BHG. (I've heard this (deposit build up) can cause slightly higher compression and eventually, detonation as a result). I did clean the head up as well as the pistons before I put the head back on, so I can't see the compression still being affected to that degree.
Any other thoughts or suggestions?
Car is bone stock and runs great otherwise. Plenty of power and runs very smooth. :icon_bigg
I've noticed when I am driving near a curb it reflects the sound really well and I believe I am hearing detonation. I'm familiar with the sound so I'm pretty sure that is what I'm hearing. It's like a random but frequent "ticking" or "clicking" from the engine on semi to high load, part to full throttle.
I haven't checked the timing yet since I replaced the head gasket, so I'm assuming I put the dizzy back in with a little too much advance??? The 7mge has a knock sensor, but how much does the ecu rely on it?
Also I'm running 87 fuel and wondering if I need to run 89 instead? Will have to try that after I check/adjust the timing and find that doesn't help.
One other thing; stock compression on the 7m should 160 if I recall. I tested mine at 180 across the board. I attributed that as a result of the carbon/deposit build up on the combustion chamber of the head and on the tops of the pistons, which I found when I pulled it apart to do the BHG. (I've heard this (deposit build up) can cause slightly higher compression and eventually, detonation as a result). I did clean the head up as well as the pistons before I put the head back on, so I can't see the compression still being affected to that degree.
Any other thoughts or suggestions?
Car is bone stock and runs great otherwise. Plenty of power and runs very smooth. :icon_bigg
