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Possible Vlave Float Issue?

 
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Old 05-08-2011, 02:59 AM
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Possible Vlave Float Issue?

I've been having a strange issue with my lude lately. When driving under normal conditions like just cruising around it seems to drive 'ok'. But when going into the higher RPM's (above 5k) im getting a lot of noise coming from the top of the motor. Its a very 'pingy' / popping sound. I tried disabling vtec with my laptop to see if it had something to do with the sound, but all that did was make it quieter. Vtec feels very week and the overall top end performance of the car is quite pitiful. I should also note that all the timing belt maintenance has been done along with a manual tensioner swap only 10k ago, the car currently has 99,000 miles.

I think i might be experiencing valve float, which leads me to believe that either the cam, rockers, or my valve springs are not in good shape. A visual inspection of the cams and rockers showed no obvious problems. I do not think that the valves are bent due to a recent compression test with 200 across the board. I also noticed that i have alot of carbon build up in 3 of my intake runners. This seems to support my valve float theory. Worn out valve springs could cause this issue. But seeing as how I am unsure I figured I would ask the Lude community what they thought. Hopefully I can solve this issue sooner, rather than later.
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Old 05-08-2011, 07:29 AM
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Re: Possible Vlave Float Issue?

There are other possibilities, such as:

1. Oil level/oil type - If oil is low or incorrect weight it can cause valvetrain noise
2. Valve lash - seems pretty obvious, but it can casuse valvetrain noise
3. timing belt - most certainly can cause valvetrain noise if loose or say 1 tooth off
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Old 05-08-2011, 01:33 PM
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Re: Possible Vlave Float Issue?

I use full synthetic 5w30 oil and always keep up on filling it. valve lash was checked and was still in spec. I also checked my timing and everything seemed in place.
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Old 05-08-2011, 11:59 PM
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Re: Possible Vlave Float Issue?

do a leakdown test. first at around 10 psi, listen for leaks around the head, or spray soapy water in the intake/exhaust ports along with doing that. the soapy water will definately point out any leaks in the head/valves. then pump the leakdown test up to 100 psi and listen again, as well as in the crancase.
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Old 05-09-2011, 04:40 PM
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Re: Possible Vlave Float Issue?

i think a leakdown test is unnecessary due to my recent and passed compression test.
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Old 05-09-2011, 04:48 PM
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Re: Possible Vlave Float Issue?

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Originally Posted by HypnoFish View Post
i think a leakdown test is unnecessary due to my recent and passed compression test.
Haha very true I am trying to think of what it may be but I may need to sit on this one for a while, vtec shouldn't even engage if the oil pressure is low so its probably not that... If you wore out your vavle springs at 99k that would certianly be weird, mine were fine at 135k if you think it is that though I would send you my used vavle springs for just the cost of shipping if you didn't have enough to buy a new set or anything :P You have hooked me up so if I can help hook you up I will, thing is I think if your vavle springs were bad it would show in the compression.
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Old 05-09-2011, 05:33 PM
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Re: Possible Vlave Float Issue?

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i think a leakdown test is unnecessary due to my recent and passed compression test.
Leakdown testing and compression testing is not the same thing.

And there is several types of compression testing, such as cranking and running compression testing, and they both test different things. You could be missing something.


Just sayin'...
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