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Old 01-27-2018, 06:12 PM   #1
91nissyse
 
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Default Vg30e knocking

Hello all

I need some direction before I start tearing into things. I have a 91 Nissan v6. I have checked the ECU for codes, and all I had/have is number 34 ( knock sensor). I have a knock coming from the distributor area. That's where the noise is the loudest. Is it possible, that there is too much play between dizzy gear and cam gear?

I wouldn't think a rocker is making this much noise but I can't rule it out. Any ideas?

There is a video on YouTube with the same sound my engine is making. The description states that a cam bearing was going bad and causing a knock. I guess I'm looking for ideas/suggestions. Thanks
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Old 01-28-2018, 03:42 AM   #2
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I believe the cams ride on oil like the crank does.

You could always pull the dizzy cap and see what kind of play is there. People kept telling me to use a stethoscope to find the cause of the noise. My clatter ended up being real bad. Hope yours is just a hiccup somewhere.
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Old 01-28-2018, 05:40 AM   #3
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the distributor shaft could be worn out and loose as a goose.
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Old 01-28-2018, 11:30 AM   #4
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The knock sensor is supposed to allow the ECU to make small adjustments to the timing to eliminate knocking.

I have always wondered why Nissan expected knocking to be going on in the first place.

Maybe low grade fuel? If so, you could try a higher octane fuel to see if that eliminates the knock.
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Old 01-28-2018, 03:35 PM   #5
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I run the highest grade fuel I can. How much side to side play in the rotor do you guys have?

I bought a second (used distributor) a while back with the same results. Both dizzys have the same amount of play. There isn't any up and down movement. I'm at a loss for now until I pull the valve covers.
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Old 01-28-2018, 05:31 PM   #6
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Quote:
Originally Posted by 91nissyse View Post
I run the highest grade fuel I can. How much side to side play in the rotor do you guys have?

I bought a second (used distributor) a while back with the same results. Both dizzys have the same amount of play. There isn't any up and down movement. I'm at a loss for now until I pull the valve covers.
There is a bolt that you are supposed to snug down to keep the distributor from rotating. You loosen it to set the timing, but then it needs to be snugged down.

If that is the source of your distributor play, you need to get that fixed.

You might need to post a video or something.
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Old 01-29-2018, 03:55 AM   #7
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Quote:
Originally Posted by 91nissyse View Post
I run the highest grade fuel I can. How much side to side play in the rotor do you guys have?
Ive got none. Nada. No play in any direction.
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