Connecting rod slap or knocking?

**guimond47** · 11-07-2011

Hey guys ive been experiencing some ticking sound in my engine i did wat some threads i read to do like running seafoam in it and looking around with a screw driver where the sound was coming from... Well i narrowed it down to the sound comming from my oil pan like a rattle/ knocking noise.. This just randomly started to happend.. Well also whats weird is im not getting any extra kr from this knocking noise in my engine and also wat i notice is wen im doing 60 mph let say and i let off the gas and just coast, my rpms jump from 1800 to 1200 with a second or two between it .. Wat could this be ? I just wanted to see if anyone experience this before? Thanks
Steph

**blueguy** · 11-07-2011

Video it.

And post it.

**Fivefingerdeathpunch** · 11-07-2011

Originally Posted by bluegtp91

Video it.

And post it.

= profit.

**BillBoost37** · 11-08-2011

Most likely that rpm thing you are noticing is normal and you are hyper sensitive looking for stuff.

The noise.. could be a flex, etc. Have you checked oil pressure?

**guimond47** · 11-08-2011

Noo i would i check oil pressure ?

**BillBoost37** · 11-08-2011

With a manual gauge

**blueguy** · 11-08-2011

Video?

**guimond47** · 11-08-2011

Video is coming guys , it will be up tomarrow hopefully im realy busy been working 14 hour shifts lol but yea ill try to post tomarrow soo check up then.

thanks

**Hippo Machine** · 11-08-2011

Grand Prix Rod Knock 3800 3.8L V6 - CONFIRMED - YouTube

This right here is a video of the knocking of the rods (

)

Yea.... I fixed it now but you dont want that **** happening.

**guimond47** · 11-09-2011

Nahh mines not that bad , its like a cold knock to me like cold start up but it always does it cold or warm

**guimond47** · 11-09-2011

Hey i got the video and i also post my tc problem in it too. Tell
Me what u guys think of both thanks. Gtp knock noise - YouTube

**blueguy** · 11-09-2011

That's not flex plate related, 99.9% of the time, the flex plate noise goes away under throttle.

Pull off your valve covers...check your rockers...one could be loose.

Mods?

Also...how do you spark plugs look? What plugs are you running?

**guimond47** · 11-09-2011

Plugs havent checked yet.. And im running the al 104 and anyone know about the tc issue? Lol

**siLversLeigh** · 11-09-2011

ok I'll bite, wtf is rod slap?

**machinegunsquid** · 11-09-2011

Not sure about the TC issue, but it shouldnt matter, cause you oughta be doing burnouts everywhere...XD

Obviously, it's only occuring on one cylinder...

Might be a tiny little piece of something in one cylinder (spark plug, chipped piston) Thus causing piston slap. Best bet is to pull the plugs and see how they look.

Also, doesnt sound nearly nasty enough to be rod knock....

Oh, and its Piston Slap, and rod knock....And I doubt you'd get a good KR reading in park, lightly revving it, you need to have the engine under load.

**guimond47** · 11-10-2011

I had a chipped piston and wen that happend my gauge showed me 275278383misfires and 20,0+ kr soo its not piston chip because the power is still there as usual ... Ill have to see and pop the valve cover..

**blueguy** · 11-10-2011

Pull.

Your.

Spark.

Plugs.

You also didn't answer me...what mods do you have on the car?

**guimond47** · 11-10-2011

The 3.4 setup sorry man lol headers , 3.4 pulley . Overkill pcm ... Ummm ubend delete . K&n ...104 plugs .. And yea man ill bee pulling them tonight or this weekend ...