Vtec Problem

[VtecFreak]

vtec kicks in then kicks off and the check engune light comes on, any idea what could be causing this???

[VtecFreak]

is the led in the middle of the p28, if so the guy who made it put a warrenty sticker over the top

[BustedLX]

Originally posted by VtecFreak
is the led in the middle of the p28, if so the guy who made it put a warrenty sticker over the top

There's no LED like that on OBD-1 ECU's that's only on OBD-0's. With OBD-1 the check engine light will flash a sequence indicating the fault.

[VtecFreak]

I have a P28 ecu which is obviously an OBD-1, but the check engine light isn't flashing at all. It just pops on and stays on until I turn the car off and back on again. I'm going to try and figure it out tomorrow, but from your expirence do you know what codes to look for and what could possibly cause this. I'm kind of leaning toward a bad selenoid, because I re-wired it up today to make sure there was no loose wiring and it still doesn't work right. I know the pressure switch is new, I just bought it but other then no vtec the car runs great and I'm loving it. I just need to figure this damn thing out so run it at the track once before they close

[BustedLX]

How did you wire up the EGR valve? The F22 and H22 use a different connector and you have to cut the connector from the H22 harness and splice it to your F22 harness. If you messed that up would would get a CEL.

[VtecFreak]

the only cel I'm getting is after vtec tries to engage, but as far as the EGR goes we used the one off the accord, but if I have to switch it back I will. But would the EGR valve stop vtec from staying engaged?? We also dissconnected the fuel pressure regulator because I read something that said it wasn't nessecery to wire it in but I'm kind of thinking differently now.

[BustedLX]

Well wait a minute. I feel like a dumbass now. You said you are using the P28. The P28 doesn't control an EGR or FPR solonoid so that can't be the problem. Sorry I thought you where using the P13.

Anyhow I was thinking about why your block had the VTM removed like that. Some Vtec controllers like the Field's for example do not use the VTM sensor at all. They just send a signal to the ECU so the ECU thinks the VTM is connected. Maybe there is something wrong in your head that they decided to just connect an aftermarket Vtec controller and eliminate the VTM sensor so the problem would go away? I don't know but that's all that comes to mind.

Does your head seem clean? Remove the Vtec solonoid and check it's filters to make sure they are not clogged with debris. That could be the problem. Also inspect the oil passages.

[VtecFreak]

I sure hope my head isn't messed up, that would really suck ass. And where is the filter located in the selenoid and would I have to take off the whole vtec assembly to get to it. Busted what wires do I have to jump to get the cel codes to show up??

[VtecFreak]

ok I'm going to see if I can get the code it's throwing

[BustedLX]

Just remove the Vtec solonoid and there is two screens there that filter out debris from passing threw the Vtec solonoid. If there are clogged it would cause the problem you described.

[VtecFreak]

I'm getting a code 21 ( vtec selenoid valve), so you think this could possibly be a clogged filter or a bad seleniod?? I"m going to clean out the filter in a few to make sure that isn't it.

[BustedLX]

Originally posted by VtecFreak
I'm getting a code 21 ( vtec selenoid valve), so you think this could possibly be a clogged filter or a bad seleniod?? I"m going to clean out the filter in a few to make sure that isn't it.

Well, was it clogged up like I suspected? Or is the Vtec solonoid actually faulty?

[VtecFreak]

I took the vtec assembly completely apart and only saw one screen, but it was clean. I think I'm just going to get a new selenoid and hope that fixes the problem, if that doesn't work then I'll be completely lost.

[VtecFreak]

I just realized that my oil pressure sensor on the back of the block isn't hooked up could this casue the vtec not to work??