What in the name of god has happened to my car!!? Valve help!
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Senior Member
Joined: Jan 2005
Posts: 142
VQPower, are you trying to drive me to suicide? You seem dead set on throwing a monkey wrench into my life right now.
Kevin, will do. What I dont get is the car has had nothing but good gas all its life, with semi-regular Seafoam additions, it can still get build-up?
UPDATE: I changed my PVC Valve yesterday, 115k on the old one, and I swear to god, I havent heard the first ping yet. Im taking the car out when it warms up tday and we'll see what happens. Anybody ever heard of the PVC valve causing engine noise ect?
Kevin, will do. What I dont get is the car has had nothing but good gas all its life, with semi-regular Seafoam additions, it can still get build-up?
UPDATE: I changed my PVC Valve yesterday, 115k on the old one, and I swear to god, I havent heard the first ping yet. Im taking the car out when it warms up tday and we'll see what happens. Anybody ever heard of the PVC valve causing engine noise ect?
your pcv takes crankcase pressure and relieves it into the intake manifold and you can get oil(usually do) into the intake manifold, the oil will lower the volitility of the fuel and cause knocking. you should look into the home depot oil catch can, which catches that oil blowby in a canister and helps prevent detination. its real cheap and could help out with your problem.
Thread Starter
Senior Member
Joined: Jan 2005
Posts: 142
Thread Starter
Senior Member
Joined: Jan 2005
Posts: 142
your pcv takes crankcase pressure and relieves it into the intake manifold and you can get oil(usually do) into the intake manifold, the oil will lower the volitility of the fuel and cause knocking. you should look into the home depot oil catch can, which catches that oil blowby in a canister and helps prevent detination. its real cheap and could help out with your problem.
Awesome, Yeah I saw Irishes write up on it sometime ago. It seems that should be the next step, although since changing my PVC valve Ive noticed no pinging, and I seemed to have gained some power or something. Not sure if this is mental but it seems to have helped. Either way, the Oil Catch-can is my next step regardless.
Thread Starter
Senior Member
Joined: Jan 2005
Posts: 142
I have discovered a heat shield that wraps around the pipe right before the flex section has rusted off its weld and looks like it can cause some noise. I also changed my Fram filter back to the Nissan one and poked around at the heat shield... Now the noise has quieted quite a bit. It is also cooler outside, so who knows..
Anyone want to see a picture of this?
I have discovered a heat shield that wraps around the pipe right before the flex section has rusted off its weld and looks like it can cause some noise. I also changed my Fram filter back to the Nissan one and poked around at the heat shield... Now the noise has quieted quite a bit. It is also cooler outside, so who knows..
Anyone want to see a picture of this?
Anyone want to see a picture of this?
I do
Thread Starter
Senior Member
Joined: Jan 2005
Posts: 142
OK, I'll look for it, thank you!
Ive been hearing some pinging today, not near as bad as it was last week but still audible. Id like to think the PVC Valve helped but Im still getting a little bit of noise. What do you think VQPOWER? Do you think my Transmission is going to need replacing? Wiper Motor maybe?
I have discovered a heat shield that wraps around the pipe right before the flex section has rusted off its weld and looks like it can cause some noise. I also changed my Fram filter back to the Nissan one and poked around at the heat shield... Now the noise has quieted quite a bit. It is also cooler outside, so who knows..
Anyone want to see a picture of this?
Anyone want to see a picture of this?
Last edited by crazy97; Sep 29, 2008 at 09:16 PM.
When cruising at low speeds (15-20 mph) as mentioned earlier, I noticed that if I shift into neutral, the rattling stops. Wierd. I will also check to see if I have any lose exhaust pieces rusted away. Im in the south and dont normally have much to worry about when it comes to rusted pieces. My fiancee's Altima had that same piece break away from the weld. I had it re-welded and fixed the problem.
Also, if it is truly a light ping (around 40 to 45mph and under 2500 rpm with light to no throttle) it is normal. Mine started doing it around 40K. The theory is that oil blowby via the PVC lowers the octane in the combustion chamber. PVC blowby is greatest at low rpm.
A catch-can will cut down on it, but not eliminate it completely.
A catch-can will cut down on it, but not eliminate it completely.
Thread Starter
Senior Member
Joined: Jan 2005
Posts: 142
Also, if it is truly a light ping (around 40 to 45mph and under 2500 rpm with light to no throttle) it is normal. Mine started doing it around 40K. The theory is that oil blowby via the PVC lowers the octane in the combustion chamber. PVC blowby is greatest at low rpm.
A catch-can will cut down on it, but not eliminate it completely.
A catch-can will cut down on it, but not eliminate it completely.
That sounds exactly like whats happening with my Max. If Im easying along I'll get some ping(sometimes), but if I get into the gas its gone. Im going to work on gettng my catch-can installed this weekend.Thanks for the info.
What this means though is removal of the outer timing cover, and than the primary and secondary chain assembly's. It's a PITA job in the car, probably the most advanced one that doesn't nescessatate engine removal. Removal of the upper oil-pan is highly recommended, allthough out of the 6 times I've removed a vq outer cover in the car without dropping the pan I haven't had a single leak long or short term except for on the 6th time! BUT the guy demanded to pick the car up way early and might be trying to scam me/not have a leak as well, it's a ****ty/sketchy story. But expect to pay between $850-$1400 in labor alone.
Last edited by russianguy; Oct 8, 2008 at 06:12 AM.
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Joined: Oct 2008
Posts: 21
From: Birmingham Al
Hey somone at the NISSAN DEALER told me that "yea valve ping in those 3.0 liter engins is just a characteristic dont worry about it." What an idiot. Anyway changing all the coils is what eventually fixed mine. Sometimes the misfires will not always register with the computor and give an light.
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