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02-01-2020, 11:05 AM | #1 |
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VVT Not Enabled
Chasing an issue with VVT staying at 0 in my car. Here's what I've done so far-
Checked my clamped vacuum lines on the solenoid under the intake plenum Checked for vacuum leaks overall Re-flashed my tune and reset the ECU by removing battery power with all accessories on for 30 minutes Started car and did not touch gas pedal for 15 minutes Reverted to first tune revision for car when turbo was installed Reset ECU the same way I did before Started car with the car already hot, no gas pedal for 15 min VVT still will not enable. One cam in ECUTEK is not cycling until I start driving the car, it is exhaust bank 2. I replaced the OCV solenoid with a known good one and reset ECU again. My question also is this: does exhaust bank 2 normally not oscillate with the other 3 cams, or is the actual OCV probably filled with gunk? This started with sudden loss of power in most of the load map one morning. Idatalogged and found that VVT isn't turning on, which is why the car isn't building boost quick and has 1/4 of it's power in positive boost pressure load areas because there's no timing from VVT. The picture below shows 3 of the 4 cams oscillating during a cold start cycle, and exhaust bank 2 sitting calmly at 0. Thank you for any insight. The car has no other trouble other than it runs like shit in most of the load map. Car is a 2013 FRS running at custom turbo setup. Stock engine, ECUTEK is my tuning platform and I'm using A01C revision since B01C bugs out with Racerom. Car has been turbo and had 63 tune flashes with no issue and 9,000 miles. |
02-01-2020, 12:28 PM | #2 |
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I had the same issue and it was a bad cam angle sensor. Not the solenoid, but the actual sensor.
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The Following 2 Users Say Thank You to Tonrogs For This Useful Post: | DarkPira7e (02-01-2020), Ultramaroon (02-01-2020) |
02-01-2020, 01:39 PM | #3 |
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02-01-2020, 04:16 PM | #4 |
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Until Tonrogs' reply, without codes, I would've never guessed. Awesome insight.
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02-01-2020, 04:36 PM | #5 |
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a hint is that vvt exhaust reached negative values
Exhaust cams aren't allowed to go advanced past 0 so that is a false logging, so I also think is the cam angle sensor Also cheap to buy, but be aware it needs a really careness to install because the distance must be corrected with special gaskets if needed, to have around 1.3mm of distance between the sensor and the cam plate Otherwise you can induce misfires, there is a TSB explaining very well this I mean, just install it, but if you get cel and misfire at least you know why Last edited by tomm.brz; 02-01-2020 at 04:53 PM. |
02-01-2020, 05:43 PM | #6 | |
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Quote:
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The Following User Says Thank You to DarkPira7e For This Useful Post: | Ultramaroon (02-02-2020) |
02-01-2020, 05:51 PM | #7 |
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Hope it fixes, could also be the cam actuator that went bad, if it struggles to go to 0
Does it follow the other exh cam? Does it swing or steady at a value while idling? |
02-01-2020, 05:59 PM | #8 | |
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Quote:
EDIT: After letting it idle for 10 minutes, it is following the other cam and zeroing out. I went for a 5 minute drive, still not activating Here's a datalog - https://datazap.me/u/darkpira7e/no-v...?log=0&data=24 Last edited by DarkPira7e; 02-01-2020 at 06:55 PM. |
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02-02-2020, 01:47 AM | #9 |
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tricky
post a log of prolonged idling with warm oil and idle under 950 rpm, with all VVT loggable values activated maybe... |
02-02-2020, 03:09 AM | #10 |
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I think bank 2 exhaust is still mostly dead. I bet that long stretch and chunks of perfectly zero indicate lack of signal.
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02-02-2020, 04:01 AM | #11 |
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i don't know, i also get sometime an evenly 0 in my exhaust side, a looot more smoother than intake
and don t have problems Also i think a lack of signal could have thrown a CEL and misfires, since cam angle sensors are used to dictate the firing order |
02-02-2020, 04:14 AM | #12 | |
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Quote:
I'm also surprised no CEL.
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02-02-2020, 04:19 AM | #13 |
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this engine is weird, and his oil channels too,
i too have super steady exhaust cams, and stupid retarded-responding intake cams, but no problem at all I think there is something else in his car stopping the vvt to enable |
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02-02-2020, 04:50 AM | #14 |
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Did you have the famous valve recall that affects someway the cam oil channels?
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