I'm tuning my '99 Accord i4 with T3/T04 running 9 psi through a Emanage and a LM-1 and I have my VTEC engaging at 3900 at full throttle. I am throwing a VTEC malfunction code. My oil is fine and is full. The car has not been on the road for about a year though so do I need to clean the solenoid? Why is it throwing a code? VTEC is engaged at 3900 b/c I make almost 100 whp when VTEC engages so I had to engage it lower. Is it engaged too low and the car is not seeing enough oil pressure? At full throttle though I usally get about 80-90 psi of oil pressure.

 

nevAr seen Vtec make 100whp........ Think we need some dyno sheets

 

Even though this has no bearing on my questions, here it is:



Now can you answer my questions.

Oh yea, I never said VTEC made 100whp. I said when VTEC engages it makes about 100 whp, that is the combination of VTEC and boost.

Also, since then I have changed fuel management:before 2 extra 440cc injectors in addition to stock injectors, now 4 DSM 450's, before MF2 to control extra injectors and Fields SFC-VTEC w/ Missing Link, now Greddy Emanage. VTEC was engaged around 4K in this dyno but the #'s were slightly lower than what the car is currently at.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Excelerate &raquo;</TD></TR><TR><TD CLASS="quote"> I am throwing a VTEC malfunction code. </TD></TR></TABLE>
Which code does it have stored? That can sometimes narrow it down a little.

 

Could the vtec solenoid have just gone out? Never heard of it happing but that dosn't mean it can't.

 

thats has got to be one HELL of a kick when your vtec engauges. although your power soon falls right after....

 

I'm getting the follwoing codes:

- P1106 (Barometric Pressure sensor circuit range performance malfunction) - maybe b/c the car is running a little too rich in some spots

- P1259 (VTEC System Malfunction) - I don't know why I'm getting this

The odd thing is if I clear the codes, btw I'm using a MAC OBDII Universal Scanner, and I take the car for a pass VTEC engages fine. As soon as I make that first hard pass though the code comes back on. I don't know, maybe the car is running too rich and somehow affecting the VTEC but it was my understanding that VTEC engages based upon volumetric pressure of oil and there is sufficient oil and oil pressure. However maybe at 3900 even though I'm at full throttle there needs to be oil pressure??

 

ttt

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Excelerate &raquo;</TD></TR><TR><TD CLASS="quote">I'm getting the follwoing codes:

- P1106 (Barometric Pressure sensor circuit range performance malfunction) - maybe b/c the car is running a little too rich in some spots

</TD></TR></TABLE>
Most likely a bad baro sensor.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Excelerate &raquo;</TD></TR><TR><TD CLASS="quote">
- P1259 (VTEC System Malfunction) - I don't know why I'm getting this

</TD></TR></TABLE>
This code tripping above 4000 rpms usually indicates an oil presure problem. Is it a clean engine or does it have a bit of grunge buildup?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Excelerate &raquo;</TD></TR><TR><TD CLASS="quote"> I'm using a MAC OBDII Universal Scanner, </TD></TR></TABLE>
Does that scantool let you moniter the data parameters in real time? If so, go for a drive and see what the VTEC presure switch is up to.

 

Have you checked the oil sending unit preasure sensor. This device tells the ECU that it has or doesn't have the right amount of oil preasure. If it is clogged or faulted, the ECU will not know the propper condition of the oil sending unit, and it will fail to actuate the VTEC solinoid inturn telling the computer there is a VTEC failure. Your Baro sensor is probably not related to the VTEC issue.

 

pull a temp sensor off the engine, and let it hang there. the motor will never know its warmed up. then you should be able to run it rich, and the ECU will think everything is fine. worth a try.

 

Turns out that the oil pressure sensor was not getting any voltage. We called Greddy and found out that the Emanage manual says to cut and tape off a wire on the wrong side. So for now it seems fixed.

Another problem though I have had for years is the idle surging. I have cleaned the IACV a bunch of times and when we took it apart the other day we diagnosed it and it is doing its job. Somehow by adjusting the idle screw lower with the EVAP connector disconnected (b/c the Helms says to adjust idle this way) I have gotten rid of hte surge at idle but funny enough if I rev the car over 2K and hold the throttle there the surge still happens. If I hold it at 3k the surge still happens, but after 3500 it goes away? WTF?!?!?!?!?