thomas4age
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| posted on 22/3/07 at 02:57 PM |
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4age VVT problem (blimble)
Hey all, after a nice blast last week my striker is not running to well when on idle,
I tackeled the problem down to the VVT system not working correct,
first I put a mark on the VVT cam pulley when the engine was at stand still, then I per the book tried to turn the inner part of the pulley by hand,
it's free and moves.
I hooked up a timer light(strobe) to the engine cyl 1
as per my suspicion the vvt pulley remains in the fully advanced setting, and I know the engine runs crap below 1500rpm then because I wired up wrong
at first when the 20valve went in.
I suspect the VVT solenoid to be the blame, so I took it out and tested it as per the book, you should see the inner piston move when 12v is applied,
and it moves indeed but only about 2/10th of a mm (very little) I don't know whether this is ok because the book doesnt't state how much
movement there should be.
has anybody (blimbleuk maybe) got on lying around which they want to check for me?
if this seems to be ok the vvt cam timing pulley maight be broken, but it seems ok, because after a nights standstill the engine runs good for about
5 to 6 sec and the pulley stays in normal position, then it suddenley advances the cam, and doesn't return to the 0 mark.
all help is welcome
regards Thomas
If Lucas made guns, Wars wouldn't start either.
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02GF74
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| posted on 22/3/07 at 03:52 PM |
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0.2 mm - that is 2 hairs width; doesn't sound right.
what is it pushing/pulling? and do you think that with this movment on whaterve it is acting on is going to make a difference?
If you press on it when powered off/on are you able to move the plunger?
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stevec
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| posted on 22/3/07 at 05:47 PM |
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Engine oil level?
I think I remember someone saying something about low oil level causing lack of pressure to the actuator for the VV system
Steve.
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Johnmor
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| posted on 22/3/07 at 09:07 PM |
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VVT
I know that low oil pressure can cause problems with many VVt ,first sign that VVT may fail is noise level when oil pressure is low.
Not sure but how is the oil pressure at tick over.
Prob need 25lbs to make VVT operate correctly
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bimbleuk
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| posted on 23/3/07 at 11:59 AM |
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Hi Thomas,
If you haven't already solved this I'll try to test the solenoid later. Luckily I trailered the car back last night. Have you spoken to
Martin at RAW about this? Maybe worth a try.
The only failure I've had so far was the blacktop cam belt tensioner (hydraulic self adjusting which didn't!) went slack and the belt
jumped a couple of teeth. Idled OK except it lost 50BHP from the top end.
Justin
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thomas4age
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| posted on 23/3/07 at 12:31 PM |
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No I havent tackeled it allready and have contacted Speedon in holland, but mischa's busy at the moment moving to a new home so... mischa was in
the Uk last week and asked around for me, seems that Raw have never had this problem.
anyway Oil presure is very much OK, 30psi on idle and upto 50+ on rpm
know that the pulley is working under oilpresure because it starts ok then goes 15deg adcanced under oilpresure, the problem is it doesn't
return to 0deg after the solenoid is supposed closed buy the ecu, so expectation lies with solenoid for not returning to closed mode, ie stuck open
and letting oilpresure into the cam making it 15deg advanced as long as the engine is running.
the ecu tells the spolenoid to let oil in the cam and then advanced it, so even with no oipresure the problem should be NO advance, and I have the
opposite.
if you would be able to check your vvt OCV (solenoid) in the side of the head, I would be very happy Justin, if it seems to woring ok the pully is the
next step for me,
regards thomas
[Edited on 23/3/07 by thomas4age]
If Lucas made guns, Wars wouldn't start either.
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thomas4age
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| posted on 25/3/07 at 11:36 AM |
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Justin, sorry for asking again but have you checked yours allready? seems that these SilverTop vvt valves are quite hard to get in this country. and I
have a trackday comming up on the 22nd of april. if mine is indeed broken I need to order quickly.
grtz Thomas
If Lucas made guns, Wars wouldn't start either.
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bimbleuk
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| posted on 25/3/07 at 07:03 PM |
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Sorry about the delay but the last two days have been flat out preparing and yesterday racing the Radical Clubsport I pit crew for. Usual last minute
prep like installing a new fuel tank, swirl pot and two fuel pumps the night before 
Anyway the valve came from the blacktop as the silvertop didn't have one when I bought it. When applying 12V there is a very distinct click and
looking at the end of the valve where the circlip (or whatever you call it) is the piston moves at least 3-4mm further in to the solenoid body.
From the hole at the side you do only see a very small gap appear maybe less than 1mm so I assume the piston inside is probably tapered to allow oil
flow.
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thomas4age
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| posted on 26/3/07 at 02:22 PM |
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Hmm suspective at least.
Mine does click, but it only moves a couple of hairs into the body.
I will take it out tonight and see what's underneath the circlip, might be just gunked up or something.
grtz Thomas
Thanx very much justin!
If Lucas made guns, Wars wouldn't start either.
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