vtec trouble
07-13-2010, 04:58 PM
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vtec trouble
did a ls/vtec swap in acura and for some reason when it crosses in to vtec it throws a check engine light(vtec code) and loses power i can run vtec on a toggle switch and it runs fine so some help please.the person i bought it from says it needs lost motion sensors do u think that could be causing it
07-13-2010, 07:55 PM
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Re: vtec trouble
Lost motion sensors? LOL.. Someone was seriously trying to bullshit you, they don't exist. The ECU uses the oil pressure switch and vehicle speed to determine whether to engage VTEC or not.
There are multiple VTEC CEL codes, which one is it? You've obviously read the code, and it will give you all the info you need.
There are multiple VTEC CEL codes, which one is it? You've obviously read the code, and it will give you all the info you need.
07-14-2010, 07:23 PM
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Re: vtec trouble
Lost motion assemblies, sure. Lost motion sensors don't exist though. A sensor and an assembly aren't the same thing obviously.
You still haven't said which trouble code you're getting. I suspect you have a problem with your VTEC wiring though. I'm guessing this is an engine swap and someone completely fucked the wiring harness (which is pretty common for backyard engine swaps...)...? Let me guess, the wires are twisted together and covered with electrical tape?
You still haven't said which trouble code you're getting. I suspect you have a problem with your VTEC wiring though. I'm guessing this is an engine swap and someone completely fucked the wiring harness (which is pretty common for backyard engine swaps...)...? Let me guess, the wires are twisted together and covered with electrical tape?
Last edited by Fabrik8; 07-14-2010 at 07:27 PM.
07-14-2010, 07:29 PM
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Re: vtec trouble
well then thats wat it is would that cause it to rattle like the valves are out of adjustment (just adjusted valves) and vtec wires are taped and need to solider them that might help
07-15-2010, 08:19 AM
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Re: vtec trouble
If you can make VTEC engage with a toggle switch, that eliminates pretty much everything inside the engine. That's why I'm saying you should fix the wiring between the ECU and the VTEC switch and oil pressure solenoid.