Tapping, knocking noise 02 TB 93k

[81turboguy]

Thanks for the input. I did have the belt off and the noise was still there, I'll check for play in the pump though.

It seems louder around the intake oddly. Probably going to drop it off at the garage for them to do the compression test and look at the intake/exhaust manifold, don't have the time to do it and I'd hate for it to get worse. I'll report back in case it can help someone else.

 

[gmcman]

The removing the spark one coil at a time is the power balance test to find a bad cylinder. To conclusively find a bad cylinder, I think the next test would be checking the compression in psi.

This is true but not in the context that I was referring to. A power balance test is done by observing the RPM drop in each cylinder by removing the spark from each cylinder. The way I was explaining it was that removing the spark will reduce the amount of force on the rod by removing the combustion sequence and generally will pinpoint a bad rod bearing or the troubled cylinder if it was possibly a wrist pin.

If you do this test and find that one of the cylinders changed the knock dramatically, you can further confirm that cylinder by removing the spark from the previously fired cylinder at the same time by referencing the firing order on the valve cover. If the noise goes away almost completely then you have likely found the bad cylinder.

 

[gmcman]

Nice! Is that the 6.6L? I am the 3rd owner, bought it when I was 15, before I had a license ;-). I just really fell in love with the style for some reason. Just had my carb rebuilt but I'm having a secondary issue that I'm tracking down. I'd love to get the turbo rebuilt this year but we'll see how it goes. There is an excellent site I belong to that specializes in the 301 if they're ever looking for help. That's really amazing with 25k. Some orig engine bay pics would be awesome!

Yes, it's the 6.6 and is the T/A 6.6 variant. Unfortunately when I bought it I found out later the cam had 6 wiped lobes so I pulled it and rebuilt the motor. Went .030 overbore and used a Comp 268 cam. I wanted to keep it stock since the cam was specific to that particular 400 but no big deal.

I had some info wrong on my buddies 81...turns out it only has 14K miles and is still on the original tires.

 

[81turboguy]

Yes, it's the 6.6 and is the T/A 6.6 variant. Unfortunately when I bought it I found out later the cam had 6 wiped lobes so I pulled it and rebuilt the motor. Went .030 overbore and used a Comp 268 cam. I wanted to keep it stock since the cam was specific to that particular 400 but no big deal.

I had some info wrong on my buddies 81...turns out it only has 14K miles and is still on the original tires.

WOW! I'd love to see some pics of that. They're ever helpful in resoration

 

[81turboguy]

So the actual mechanic in the family pointed me to this, cam phaser noise on Fords. The noise is pretty similar. I'm going to take it in and see what we get.

I also pulled the heat shield off the manifold and didn't notice anything unusual.

[video=youtube;RCyXPvRILSM]http://www.youtube.com/watch?v=RCyXPvRILSM[/video]

 

[wesman43]

This is exactly what mine sounds like. It goes away after about 1100 RPM. But it sounds like a diesel at around 1k, then at idle it sounds exactly like that ford

 

[wesman43]

I added Lucas Oil stabilizer, from Napa.. It's really thick and I put the whole bottle per my mechanics recommendation and it took the noise away :3

 

[CaptainXL]

I added Lucas Oil stabilizer, from Napa.. It's really thick and I put the whole bottle per my mechanics recommendation and it took the noise away :3

Could be because it's more gummed up now than before and not even working. I would be doing some engine flushes first to see if it gets better. You more than likely have a bunch of varnish buildup in the engine which keeps parts from moving their entire range.

 

[81turboguy]

I have the Rislone in there now with high mileage penzoil. The last 2 oil changes I did didn't look sludgey at all to me. I'm a fan of Lucas, used it in an older Camry and Altima many times with no issues.

Haven't taken it to the shop yet, had a few other things come up and this hasn't gotten any worse from what I can tell. I was able to take a 100 mile trip or so last weekend so perhaps it's time to take the rislone out and see what comes out.

 

[wesman43]

Could be because it's more gummed up now than before and not even working. I would be doing some engine flushes first to see if it gets better. You more than likely have a bunch of varnish buildup in the engine which keeps parts from moving their entire range.

Yeah, it's back... [video=youtube;9cD4LIMPYuY]https://www.youtube.com/watch?v=9cD4LIMPYuY&feature=youtube_gdata_player[/video]

it's gotten quieter since I took this video but Def. Not how it should sound lol

 

[CaptainXL]

Now that you mention it I had that dieseling sound as well when I got my truck. Just not as bad. I also notice it getting louder towards the end of my oil change interval. What got rid if it for me was engine flushing.

The vvt action is now very smooth and isn't jerky like before.

 

[wesman43]

Now that you mention it I had that dieseling sound as well when I got my truck. Just not as bad. I also notice it getting louder towards the end of my oil change interval. What got rid if it for me was engine flushing.

The vvt action is now very smooth and isn't jerky like before.

So how would I do that? I'm a newbie when it comes to engines and anything regarding the engine other than an oil change lok

 

[CaptainXL]

So how would I do that? I'm a newbie when it comes to engines and anything regarding the engine other than an oil change lok

Drain two quarts of oil to bring the oil level down to 5 quarts. and then add two quarts of engine flush solvent. Its available at most auto parts stores. Its basically diesel. Let it idle for a good 15-20 minutes and then change oil and filter as you normally would. If you notice less noise then it is working. Do the same thing next oil change. Keep repeating at every oil change until the noise is gone. You can flush more than once back to back but remember to change the oil filter in between flushes.