[Diy_efi] Knock sensor Q

Thu Oct 31 02:35:36 GMT 2002

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Has anyone ever seen a knock sensor, or even a ECU, go bad & trigger =
knock sooner than others?

My car actually makes peak power with an a/f of about 10.5:1 on pump =
gas. It doesn't matter if the boost is 15 or 19, it just pulls too much =
timing. Leaning out from mid-high 10s to 12.0: lost 5rwhp, and its even =
worse in the 1/4 mi, where it at WOT longer (2-3 mph would be lost with =
a similar tuning change).

I've done a plug chop on the dyno, and it didn't show any cylinder =
imbalance. Compression is 172-175 in all cylinders. My FJO WB has been =
verified against others. Carbon build up isn't possible with my driving =
style. So the only thing left to check is the electronics, and new knock =
sensors aren't cheap, so I'm asking here first.

Thanks for any help,
Grant Beaty
'97 Toyota Supra T66 6-speed

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<DIV><FONT color=3D#000000 size=3D2>Has anyone ever seen a knock sensor, =
or even a=20
ECU, go bad &amp; trigger knock sooner than others?</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#000000 size=3D2>My car actually makes peak power =
with an a/f of=20
about 10.5:1 on pump gas. It doesn't matter if the boost is 15 or 19, it =
just=20
pulls too much timing. Leaning out from mid-high 10s to 12.0: lost =
5rwhp, and=20
its even worse in the 1/4 mi, where it at WOT longer (2-3 mph would be =
lost with=20
a similar tuning change).</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#000000 size=3D2>I've done a plug chop on the dyno, =
and it didn't=20
show any cylinder imbalance. Compression is 172-175 in all cylinders. My =
FJO WB=20
has been verified against others. Carbon build up isn't possible with my =
driving=20
style. So the only thing left to check is the electronics, and new knock =
sensors=20
aren't cheap, so I'm asking here first.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT color=3D#000000 size=3D2>Thanks for any help,</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2>Grant Beaty</FONT></DIV>
<DIV><FONT size=3D2>'97 Toyota Supra T66 =
6-speed</FONT></DIV></BODY></HTML>

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