XK8 vvt solenoids?
#1
XK8 vvt solenoids?
Hi all,
Got a 1997 4.0 xk8 with the cold start vvt ticking/tapping noise, blip the throttle and it goes.
Just wondered if it was possible to disconect the solenoids untill i can afford to get this problem sorted and still drive the car?
Its probably only one vvt solenoid thats making the noise but do i just disconnect one or both?
Thanks for any help
Got a 1997 4.0 xk8 with the cold start vvt ticking/tapping noise, blip the throttle and it goes.
Just wondered if it was possible to disconect the solenoids untill i can afford to get this problem sorted and still drive the car?
Its probably only one vvt solenoid thats making the noise but do i just disconnect one or both?
Thanks for any help
#2
Because of your reference to cold engine idle I assume that the issue you are describing has to do with oil pressure.
The VVT's simply operate off of oil pressure.
What weight oil in the car? How long since the last oil change?
If they quit ticking with a throttle bump, driving it should pose no problem.
The VVT's simply operate off of oil pressure.
What weight oil in the car? How long since the last oil change?
If they quit ticking with a throttle bump, driving it should pose no problem.
#3
#4
It had a full engine flush, 5w/30 semi synthetic oil, new Jag oil filter and the 4th gen top tensioners fitted only 100 miles ago
Sometimes it starts without the noise then 30-90 seconds later the noise starts just like a tappet noise, blip the throttle and it goes until the engine is cold again.
My question is if i unplugged the solenoids would the noise still remain from the mechanical side of the vvt or would it be dis-engaged?
Sometimes it starts without the noise then 30-90 seconds later the noise starts just like a tappet noise, blip the throttle and it goes until the engine is cold again.
My question is if i unplugged the solenoids would the noise still remain from the mechanical side of the vvt or would it be dis-engaged?
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Yes uppers are the secondary, and i would pull both cam covers and inspect asap. If theyre plastic bodied, these are early style and very prone to breaking. Even if they look fine change to the later style metal bodied. When you pull the old ones youll likely see a crack or split down the side that lets oil pressure bleed off from the tensioner which starts all these problems. Dont put it off, as stated its cheap compare to an engine replacement.
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Ticking
I have a ticking in my 99 XK8. It is synchronized with the valve cams. And it disappears at revving. The engine has 20K miles, its a rebuild. We changed all the tappets, but the ticking persists. A Jaguar specialist independent suggested the VVT as a source, and you are confirming it, he also mentioned assuring the oil flow. Everyone cautions about the chain tensioners. Changing the VVT is expensive, but if it works I'd do it. How can I get some assurance that the VVT is the problem, how do we do the diagnosis
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Niels, you should post up an intro in the new members section New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum
Going up a weight means using a heavier (thicker) grade of oil.
Going up a weight means using a heavier (thicker) grade of oil.
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