Whatsup guys. Alright, I've had this problem since I bought my car back in February. At Idle it lopes like it has an upgraded cam in it. Also, it has a pretty loud knock towards the number 4 cylinder (transmission side of the motor). Okay, so originally I thought that it was the timing being off a little.

Here's where it gets kind of tricky though. It once threw a IAC code out of nowhere. Also, recently I noticed that when I depress the clutch, the knocking stops but it still lopes. I'm guessing that the throw out bearing is going since this is my third 2g that's had the bearing shot at around 160,000 miles.

Now as far as the loping, I picked up two IACVs at the junkyard as well as another throttle body. I cleaned them very throughly, and swapped the throttle body assemblies. And now it's still loping.

The CEL was on until I removed the battery cables a couple months back and hasn't been on since.

So I guess that timing would be my next shot. Kind of works out though, since I have a set of adjustable gears and lightweight crank pulley ready to be installed. What's your take on this one? What would be your next move? Just looking for a second opinion.

I CONTRIBUTED TO THE WIKI!
ah... turbo. I love the turbo, the boost, the speed, the sound.
and its all better when you do it yourself. cheaper too.

My throwout ticks on warmup and every now and then and its very new. I wouldn't worry about that unless its EXTREMELY LOUD. It'll be noticeable but shouldn't be loud. As far as the lope. DO a compression test and see what your compresion is at. You may have something wrong there. LOL check to make sure you got all your spark plugs in. rofl.

95 RS sold...

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2012 2500HD LML

Captain Caveman

96 RS Turbo 11.414 @ 119.62 MSNS, Crower 2 NA cams, BW366, 10.5 comp, UDP, 60mm TB, W/A intercooler, 3.55 tranny 567.9whp 430tq
97 RS NA 13.188 @ 103.87 MSnS powered 12.5 comp, Crower 3's and 219.4whp with 175tq
98 RS DD 12.5 comp on stock ECU, LTH, Crower 2's, Koni, GC, Hypercoil, DG hats
99 OZ 5sp Stocker 15.856 @ 85.97
99 GS stocker auto 17.7@77mph!

wiki home page:http://www.2gnt.com/index.php?d=bullettdsm

You are right, brain fart on that one. :p

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2012 2500HD LML

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http://www.2gnt.com/quote_db.php?id=278

Outside of Corona: "That sucks, peace out..." (jamie walks away)... "Sweeet, what we doin?" -Zac
Tim's garage (prior to motor install): "Im gonna smoke real quick, that way if you fuck up I am already nicotined up" -Tim

LMFAO.

On the throw out bearing thing, it is so loud it sounds like the valves are tapping. I'm sure it has to be done since it is at that mile marker, and there was only one owner before me on this car so I guess he knew it was going and traded it in. Plus before it's fully warmed up, it'll shudder a little when I take off from a stop.

I'll try the comp. test and see what I get, as well as checking the timing on the cams, although that won't really tell me anything unless I get the crank off. I have noticed that at times it seems like it wants to die, doesn't go lower than about 700 rpm but I haven't really had anything like this happen to me before. And as far as the plugs go, It was doing this since I bought the car and I changed the plugs, wires, coil, IAC, and throttle body (last two were free- thanks to the junkyard).

I CONTRIBUTED TO THE WIKI!
ah... turbo. I love the turbo, the boost, the speed, the sound.
and its all better when you do it yourself. cheaper too.

ever get this solved?

Nope. Only thing I can think is either a vacuum leak at the vacuum box under the intake plenum or maybe a head gasket problem.

I CONTRIBUTED TO THE WIKI!
ah... turbo. I love the turbo, the boost, the speed, the sound.
and its all better when you do it yourself. cheaper too.

Shudder out/into 1st gear, from stop to pull, DEFINITELY a TOB. Aswell I have seen many others fail around 160K, including 2 of my own.

You ever replace it?

The tapping, are you sure its not piston slap or has that idea even come to mind? Forged Pistons?

Curious, Dealt with many phantom knocking problems on the 420A, only few of which have reasonable explanations. Fill me in.

Jeff.

Originally posted by 740TurboBrick

"Dsms run on Gasoline, DSMers run on Alcohol...Id bring a tank to refuel the DSMers..."

Sorry, the knock was definitely the TOB. I already knew that. I have no idea why I posted it.

I CONTRIBUTED TO THE WIKI!
ah... turbo. I love the turbo, the boost, the speed, the sound.
and its all better when you do it yourself. cheaper too.