BigBadBlack04Si

04 Si w/ k20a3 (header, cat back, intake)
I haven't had a chance to scan it yet but if I clear the code the car drives fine for about 10 mins then it throws the CEL again and kicks the limiter down to 4000 rpm.


Any thoughts?

Todd00

ECU is going into safe/limp mode. Obviously something is wrong and I'd stop driving it and find out the problem ASAP.

BigBadBlack04Si

Crud.
Would bad gas cause this? Its been sitting since november.

WhiteOnRice

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BigBadBlack04Si &raquo;</TD></TR><TR><TD CLASS="quote">04 Si w/ k20a3 (header, cat back, intake)</TD></TR></TABLE>
Race header? If so, you'll need a O2 sensor bung. It's like five bucks.

Todd00

Possibly. That would be something I'd def. try first. Drain out the old and put in some new.

Especially if it was 87--that tends to go stale quicker than 92+ does.

Todd00

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by WhiteOnRice &raquo;</TD></TR><TR><TD CLASS="quote">
Race header? If so, you'll need a O2 sensor bung. It's like five bucks.</TD></TR></TABLE>

Second O2 sensor would not cause this. It would just throw a CEL. 1st O2 sensor would put it into limp mode, but chances of that are rare unless he damaged it or something.

WhiteOnRice

Oh, I thought any CEL put it into limp mode.

BigBadBlack04Si

Just a megan shorty w/ stock cat. O2 was never removed or even unhooked from the harness.
I got almost all the 87 out of it and filled it w/ berrymans B12(EFI cleaner stuff) and 93.

I'm just worried it a cam sensor or something like that going bad and cutting out once it gets hot.

fridaytech

did you just do the headers....because if you were by some chance to unplug or break vtec oil pressure sensor or vtec solenoids your car wouldn't rev over 4,000 rpm... maybe you unpluged one and forgot...

BigBadBlack04Si

actually i just put the motor in.
everything is plugged in as I've check about 8 times.
It runs correctly, idles smooth, warms up, fan comes on and I can drive it for about 20 mins and then the light comes on and it quits reving.
Work has me pulling 15hr days so I didn't get to mess w/ it last night.

teejay-Si

i had this happen to me cause my oil was low. check your oil.

BigBadBlack04Si

For what ever reason this engine reads low on the stick. I have almost 5 quarts in it. It was bone dry on oil when I dropped it in. I'll add some more.

BarracksSi

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fridaytech &raquo;</TD></TR><TR><TD CLASS="quote"> vtec solenoids ...</TD></TR></TABLE>

I didn't notice a VTEC solenoid on my A3; it doesn't have it on the exhaust cam, after all.

teejay-Si

i had this problem when i would turn hard or accelerate quickly with low oil.

BigBadBlack04Si

its throwing P2646. is that the vtec solenoid on the passenger side rear of the head?