For those who run cams not compatible w/ VVT

[dirtybrd]

I've been running my VVT solenoid unplugged since I installed my Cat 3658s causing a CEL. Today I decided to fix a few things and this was one of them. I removed the electrical portion of the tensioner to see what how I could leave it plugged in but have no CEL. CoAvant (Jordan) took a spare one apart to see how it worked. He suggested pulling the pin that moves the oil control piston, I tried that and it wouldn't budge. So I thought about cutting it off, no dice, no way to hold it. So I took the piston out of the tens. and center punched the end of it where the pin hits the piston. I then drilled a hole in it larger then the pin so when th ECU actuates the solenoid the pin just goes thru the piston.n CEL solved. I now roll CEL free!!!!!!!!!!!!!

[AudiA4_20T]

could a resistor do the same thing? Im running 3652s

[A4 TSCHUSS]

hmm.. wonder what I can do since I dont have a vvt tensioner on my AEB head.

[diagnosticator]

hmm.. wonder what I can do since I dont have a vvt tensioner on my AEB head.

Have you tried using a resistor with the same value in ohms as the solenoid coil?

That won't prevent other cam timing related DTCs however.

[A4 TSCHUSS]

I have no clue what ohm it is and have never messed with resistors. The head isnt actually on yet (few more days). But I figured I would be getting a CEL since the plug that went to my AMB head with VVT obviously wont be plugged into the non VVT tensioner on the AEB head.

[hot2trots4]

Good info man. Always nice to see someone who has the balls to take stuff apart and figure it out.

[dougyfresh]

How about going into the ECu and programming it to not worry about VVT? That is the permanent fix.


EDIT: oh yeah, you have REVO so that ain't gonna happen...

[F16HTON]

I bet you I could get it done in <24 hours.

Ask Jordan about how my car runs...he witnessed it.

MAF plugged in, runs flawlessly, no codes, ESP works.

MAF unplugged, runs flawlessly, ESP works, no codes.

You just need to ask the right people at the right time.

[F16HTON]

hmm.. wonder what I can do since I dont have a vvt tensioner on my AEB head.

Have you tried using a resistor with the same value in ohms as the solenoid coil?

That won't prevent other cam timing related DTCs however.

Just remove the coil and plug it in.

[diagnosticator]

The resistance value given in the Bentley for checking the solenoid coil with a DVM, would work, the resister value doesn't have to be exactly the same it can be about the same +/- ~10 % Then you would insert each lead of he resistor in the harness connector from the back of the housing so that the leads touch the terminals. The resistor selected would need to be able to handle the power rating fiqured by Ohms law using 14 volts and the resistance value used to figure the watts for the power dissapation rating of the resistor to select in addition to the resistance value in ohms. I will look up the specified coil resistance value and figure the wattage to use and post back.

[A4 TSCHUSS]

Just remove the coil and plug it in.

sold the AMB head.

[A4 TSCHUSS]

I will look up the specified coil resistance value and figure the wattage to use and post back.

sounds good

[Don Supreme]

could a resistor do the same thing? Im running 3652s

Dude --- running = present participle....

[diagnosticator]

sounds good

EDITED
OK, the coil resistance is specified as 10 to 18 ohms, so using a lower value, I will use 12ohms, at 14 VDC 100 % Duty Cycle, Watts = Volts^2/ohms =14^2/12 = 196/12 = ~16.3 watts power disapation. A suitalble resistor is the "UAL" series resistor show here: http://www.riedon.com/us/images/stories/pdf/UAL.pdf
The part number is "UAL-50 12 05" this has a PDR of 20 watts, with a resistance of 12 ohms, tolerance of +/- 5%.

For the resistor style shown, the body can be mounted on the firewall, with some leads soldered on to connect to the solenoid harness connector terminals.

[CO AVANT]

good shit Chris. Glad you found a fix for that. I also suggested putting a dab of epoxy on the end of the pin since it regresses a bit past the solenoid surface when pushed all the way in. Just would have to check heat tolerances for the epoxy you're using though to make sure it would hold up to the engine heat in that area...

[dirtybrd]

I thought about a resistor, but I have 5 already. Doug, I talked to APR about removing the code but was told that it wouldn't work.

[20vturbo]

unitronic told me that they can disable it as well as the solenoids under the intake

[dirtybrd]

Update I now get a over-retarded code because piston is actuating but the cams aren't moving. I guess I'll have REVO remove the solenoid open code, remove a terminal and leave it plugged in.

[CO AVANT]

sounds like the same code I was getting before I unplugged VVT. Was it 16396?

[dirtybrd]

I'm not sure, I just looked at it and erased. It came on within a 1/4 mile of driving.

[diagnosticator]

Update I now get a over-retarded code because piston is actuating but the cams aren't moving. I guess I'll have REVO remove the solenoid open code, remove a terminal and leave it plugged in.

Yeah, but the ECU doesn't "know" that the piston in the timing adjuster is or isn't functionally active, only that the expected intake cam timing relative to the crank position or vice versa, is outside allowed tolerances despite the associated control action by the ECU. My first thought was maybe you could reposition the cam position sensor enough to satisfy the ECU that the cam timing is within acceptable limits, but I don't know for sure if that would work or not without trying. It's just something to consider. Also, it is possible that the fault DTC causes other effects as the ECU tries to adapt to the cam timing error . REVO should be able make an allowance in the software if this is also a factor, in addition to simply disabling the DTC.

[dirtybrd]

Moving the reluctor ring could be an option.

[AudiA4_20T]

you could find the map for the VVT and disable it also

[F16HTON]

you could find the map for the VVT and disable it also

Instead of disabling it, the best bet would be to modify it to match the timing curve of the cams with the solenoid modification in place.

[CO AVANT]

I've moved my reluctor wheel around, didn't get rid of that intake cam code I had... Take a pic of your cam reluctor, I want to see if that right tab of the wheel lines up perpendicular to a flat surface. I think I asked you this before, hmmm...