clunk?

[rlith]

The nut kit doesn't come with the CPI, you can get it at the dealer for about $45.00, the CPI you can get at advance autoparts for $270.00

[metallica21156]

don't have a advance auto thats local. ok. at least i know what to pay for the nut kit. i thought it might be around $100. i'll pick it up tomarrow.

[BlazerLT]

gmpartdirect.com has them too.

[metallica21156]

picked up the nut kit and the CPI. CPI cost about $342. the nut kit from dealer was $64. i'm putting it in tomarrow. i'm going to follow s10's wedpage on how to do it.

[BlazerLT]

You will also need a new plenum gasket.

You CANNOT just reuse the old one.

[metallica21156]

what about using sealent on both sides. worse case i'll get one tomarrow. can you tell me what a ping sounds like on a motor?

[BlazerLT]

Only use the plenum gasket, do not use sealant EVER.

Pinging is in most cases undetectable and can only be detected by the knock sensors.

In bad cases it will sound like metallic rattling coming from your engine when you for instance are going up hills.

[metallica21156]

could a bad CPI make it sound like a knock to the motor on start up? 5-10 mins. once the oil starts flowing? the best way i could tell you is it sounds like a piston knocking. but its only there when its cold. or could the lifters be doing this?

[BlazerLT]

Originally Posted by metallica21156

could a bad CPI make it sound like a knock to the motor on start up? 5-10 mins. once the oil starts flowing? the best way i could tell you is it sounds like a piston knocking. but its only there when its cold. or could the lifters be doing this?

Nope, it won't cause that.

What you might be seeing damage caused by racing an engine with fuel laden oil.

The damage might have already been done.

[metallica21156]

what could have gone bad? it always been there since i got the truck. the person before me never raced it so i don't think thats it. it only does on start up and i think that if something was really gone it would at least do it under stress. could it be carbon build up in cyinders?

[BlazerLT]

What grade of oil are your using?

[metallica21156]

10-W-30. Mobil 1 true syn. cold ol can get as high as the mark in between 40 and the red line. normal idle is just below middle mark and above 1,000 RPMs is at the middle mark or just past.

[BlazerLT]

Ok, well, for one, what temperatures is your area seeing lately?

Secondly, your engine calls for 5w30. Why you are running 10w30 is beyond me and is probably causing the cold start knocking.

You sure you don't have a Fram oil filter installed?

[metallica21156]

its in the 30's. it does it in the summer too just not as bad. i'll try to get some 5W30. and yes its not a fram since i won't use one using syn. since they only last about 3 months where i need mine to last 12.

[BlazerLT]

Once you have fixed your CPI and nut kit, I would swap in a new run of oil.

Chances are your oil is really screwed up with gas. You might not smell it, but it is there.