VTEC Malfunction - Accord Turbo
06-15-2005, 08:32 AM
#1
Honda-Tech Member
Thread Starter
Join Date: Nov 2001
Location: Branford, CT, 06405
Posts: 681
Likes: 0
Received 0 Likes
on
0 Posts
VTEC Malfunction - Accord Turbo
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.
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??
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??
06-15-2005, 09:18 AM
#2
Honda-Tech Member
Join Date: Apr 2002
Location: North of Boston, MA, USA
Posts: 2,349
Likes: 0
Received 0 Likes
on
0 Posts
Re: VTEC Malfunction - Accord Turbo (Excelerate)
at full throttle and 3900 RPMs you have plenty of oil pressure unless there's a big problem with your block.
for comparison I have my vtec set at 2500 RPMs (f23 turbo also). The SOHC F series heads only run on 1 intake valve until VTEC kicks in, that's why you get such a power jump.
baro pressure sensor code is "normal" - the ECU compares the MAP voltage to the baro pressure voltage, and since you're using e-manage, it's "fooling" the ECU by masking the actual MAP voltage (much like the AFC hack). There is no workaround to this that I'm aware of, but it is not a problem.
The vtec code is definitely not normal, first thing I would try would be to remove the solenoid from the back of the head (3 bolts) and check it out, clean the screen if necessary, see if there's any blockage...
HTH -B
for comparison I have my vtec set at 2500 RPMs (f23 turbo also). The SOHC F series heads only run on 1 intake valve until VTEC kicks in, that's why you get such a power jump.
baro pressure sensor code is "normal" - the ECU compares the MAP voltage to the baro pressure voltage, and since you're using e-manage, it's "fooling" the ECU by masking the actual MAP voltage (much like the AFC hack). There is no workaround to this that I'm aware of, but it is not a problem.
The vtec code is definitely not normal, first thing I would try would be to remove the solenoid from the back of the head (3 bolts) and check it out, clean the screen if necessary, see if there's any blockage...
HTH -B
Thread
Thread Starter
Forum
Replies
Last Post
bocas0225
Honda Accord (1990 - 2002)
11
04-23-2015 03:15 PM
