motor built up and running need help????

[Joeljoelo]

OK today I finished putting together my motor and it started rite up. Needless to say i was really happy. No leaks or smoke at all "I broke it in hard I like that method".The only thing that bothers me is that at like between 4-5k I hear a loud rattling noise but its not coming from the motor"it also does it at idle so that eliminates the drivetran".The only thing I can think of is maybe i bent the dust shield between the transfer case and the tranny".If it was that would it not make a loud noise all the time instead at higher rpm's????? Also I put hks 272 cams in and the idle sucks really bad is there a fix because it wants to stall at idle or when the rpm's drop fast??? Any advice would be great, thanks Joe....

 

[1fast97gsx]

Bump the idle up to 1000 and that should take care of the stalling with those cams. It could be something as simple as a heatshield making the rattling sound.

 

[2bar]

Is the noise coming from the engine compartment? Did you replace all your timing equipment. If the tensioner was not replaced it will cause a rattle noise. Did you replace you lifter. Lifters will be noise. Do you have solid motor mounts? That will cause a lot of different rattles. If you could be more specific it would help.

 

[Joeljoelo]

Forged vavles and guides. crower springs and retainers. 3mm revised lifters. 272 hks cams. everything in the front case is new "bearings, tensioner,belts,seals, and gaskets" No solid motor mounts and i was thinking a heat shield but its kinda hard to locate by myself. In what method should I "bump up the rpms" timing or isc???

 

[Slack_r]

Congratulations on the build! I'm not an expert, but who knows maybe its something caught in your valvetrain..

 

[Joeljoelo]

no its nothing in the motor its coming from outside of it.

 

[Joeljoelo]

It was the heat shield around the stock downpipe fixed with a 3 inch exhaust system