Motor noise at half throttle

**Slopar00** · 04-27-2015

Hey guys I have an 04 comp g and at half throttle to 1/4 throttle it has a almost "loud tapping" to "knocking" noise. Any idea to what I'm hearing guys. I mean it's not a low milage cAr it had 170k so I'm not looking for it to be quiet but noises like this scare me..

**Fivefingerdeathpunch** · 04-27-2015

Oil is full and newer?

Lifter tap, exhaust tick come to mind first.

Running 91+ octane fuel right?

**Slopar00** · 04-27-2015

Always 91. always Castrol syntec 5w30. Only 500miles on oil change maybe exhaust..?

**Fivefingerdeathpunch** · 04-27-2015

I'd have to hear the sound/tone to even give a educated guess.

**REDCRAPGP** · 04-27-2015

Take a video

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**Grimsin** · 04-28-2015

I had a noise like you describe. Finally got under the car and it was a heat shield above the downpipe.. was just touching the downpipe. Ripped it off.

Wonder if it was creating false kr now that i think about it..never know now lol.

**Slopar00** · 04-28-2015

Will false knock or knock in general make the cel come on?? It's never had a cel for knock but I have a Cam pos code Could that cause it?

**bandook** · 04-28-2015

What code?

**Slopar00** · 04-28-2015

I'll check and give the codes that come up. But I have a multiple misfire which I changed wires plugs and icm. Still have the misfire code and now after I changed the icm a few months later the cam pos code came up. Emission small leak code. Sensor 2 o2 code from the catless 3"dp.

**Slopar00** · 04-28-2015

P0341, p0455,

That's all for now

**Scottydoggs** · 04-28-2015

http://www.obd-codes.com/p0341 cam sensor

the 455 is a evap leak or purge solenoid. http://www.obd-codes.com/p0455

**Slopar00** · 04-28-2015

Thanks.

**Xorbex** · 04-28-2015

I have a leak on my header exhaust that sounds like a tick/knock. Do you hear any pfff pfff pff noises at all under throttle? Mechanical ticking and exhaust ticking sound similar but if you listen good you can tell the difference. I unplugged my radiator fans and felt around the exhaust and felt it puffing.

**Slopar00** · 04-28-2015

Good point I'll try that thanks man!!

**Slopar00** · 05-04-2015

Started the car up this morning when the motor was cold and the noise I've been hearing is coming from the back valve cover sounds like a valve tap. Is this common with these motors?

**Scottydoggs** · 05-04-2015

it could be a broken spring, or a lifter gone bad. only one way to find out, take the v/c off and check em out. you cn run the engine cover off for a bit to watch the rockers.

**Slopar00** · 05-05-2015

K will do thsnkd

**Slopar00** · 05-07-2015

Checked the oil yesterday for shots and gigs and my oil looked glittery. So issues... - loud tapping In rear of motor and glittery oil.

Any ideas now guys?

**chrsmi1** · 05-07-2015

Originally Posted by Slopar00

Checked the oil yesterday for shots and gigs and my oil looked glittery. So issues... - loud tapping In rear of motor and glittery oil.

Any ideas now guys?

Engine go boom. sorry dude

**rynoman03** · 05-07-2015

Sounds like your motor is Fvcked to me! Better start callin some junkyards. You probably spun a bearing.

Go to www.moradpartscomany.com and see what they have available.

Or www.carpart.com