VVT solenoid noise deceleration

[Leigh_bullitt]

if you have a v8 then both exhaust cams should be in same position as each other (as should the inlet cams though a different position) My bank 2 (left hand side as you sit in the car) is stuck in the fully advanced position and you can see the PID's where the solenoid is being told to move and basically is doesn't. VCT was changed and still the fault persists so it is the phaser next to be replaced :(

Did you get yours fixed finally ???

Sponsored

 

[raptor17GT]

Did you get yours fixed finally ???

Yes, i had mechanic replaced all four phasers, the four vcts, the four tensioners and the four chains. Solved the issue. Shtload of cash that cost, sigh.

 

[Leigh_bullitt]

Oh shit.
My problem is still very intermittent.
Car runs ok and exhaust sounds off then suddenly it will feel powerful again with a strong exhaust note.
Very weird

 

[raptor17GT]

maybe you have a loose wire? The fault i had was there 100percent of the time. Reset the error codes and it came back same code in like 5 minutes / 10 minutes tops. Yours sounds different. Can you 'make it happen' by doing anything specific ?

 

[raptor17GT]

Is it safe to unplug the phasers and exhaust solenoids with the engine running ?.
I would like to do a slow drive test with them unplugged

just saw this thread and read the Ford comments, looks like they did disconnect VCT's as part of their diagnostic process

https://www.mustang6g.com/forums/th...d-into-it-at-40-000-miles.178609/post-3648759

 

[Leigh_bullitt]

Nah I had a look today and did some datalogging all 4 seem good.

at idle
Intake is at 19-20
Desired is 20

Exhaust is at -0,06 to 0,12
Desired is at 0.06

all are moving correctly on the graphs. But I’ll try a datalog when it starts acting up and see if they change somewhat.

but that said I can hold the Rpm at around 2k and make them constantly rattle.

 

[Leigh_bullitt]

Tried unplugging the Exhaust solenoids and I have to say the exhaust note sounded full again. But the car was idling bad and shaking.

didn’t unplug the intake phasers though.

 

[raptor17GT]

Yeah it's amazing how crap the engine feels when the cam timing isn't where it's supposed to be. I couldn't believe how much better mine felt and behaved when it was fixed, night and day difference at the bottom end of the rev range.

Defo try to find what's happening with the traces when yours starts misbehaving but not sure how you can do that unless you have a Dyno nearby you can hook the data tracer up and then make the car misbehave.

 

[Leigh_bullitt]

Yeh
It’s almost like I have two cars the way the driveability changes.
I have tried absolutely everything else that could cause my problem but everything is within spec and working fine.

I'm going to log a couple of things to track it down if I can.

vct System - Open/Closed loop
Vct duty cycles

I’m going to check the duty cycle when running rough to see if one is compensating for the other.

funny enough took the car out today and was running off. Wouldn’t say rough but just I guess bland is the word with the exhaust sounding boomy and not crisp.

parked up for an hour and suddenly it was perfect again. Low rpm driving is smooth as silk loads of power and the exhaust sounds amazing again.

maybe the phasers are setting back to neutral and pins are damaged.

 

[raptor17GT]

Yeah bland is a very good word for it. I noticed it most when pulling away from a dead stop, engine revs dropped easily and needed more throttle input to pull away, gear changes low rpm in traffic and it spluttered and was rubbish. Now, smooth as silk, if oeing my crappy gear changes haha.

Seems odd you can have the car misbehaving leave it an hour and it's fine. Intermittent faults are the pits.

 

[Leigh_bullitt]

Yeh it’s well strange.
But my low rpm roughness sounds very similar to what you experienced. Mines a manual and you really notice it in traffic

 

[raptor17GT]

Yeah, manual here also. Sometimes if i wasn't paying attention I'd have to dip the clutch and give it more throttle as i pulled away otherwise it'd almost stall. Usually a bit buckaroo being honest. Also, if i blipped the throttle at standstill it was rough rising and kinda fluffy on the return to idle. Like i say though, my symptons were there 100percent of the time and easily repeatable.

After all the above timing gear was changed, smooth as butter and pulls away almost just on the clutch.

 

[Leigh_bullitt]

One thing I have noticed as well is when it’s running rough the engine brakes a lot harder.
so like travelling at 60mph it will engine brake a lot harder.
When it’s running smooth it’s definitely a lot less.
exhaust solenoids maybe ???

 

[raptor17GT]

The exhaust cams are more active lower down the rev range iirc but i had an error code i found using a scanner, p0024 even though no management light on the dash. If you have a scanner, check for stored codes.

 

[Leigh_bullitt]

I’ve got FORScan app but absolutely no codes at all

Sponsored