New 1997 GTP owner with rattle at idle issue

**KrashD13** · 08-27-2012

I just got a 1997 GTP with a few mods on it........seems to be in line with the recommended stuff

Headers, Exhaust and high-flow cats
port and polished heads
comp cam with roller rockers
Msd ignition and wires
Electric water pump
Intake kit
Stock SC so far.....next mod once rattle is fixed
Retuned by local dyno shop

Problem is is has a rattle at idle, I replaced SC coupler and its still there........I undid both belts its still there, so I'm guessing that its the harmonic balancer thats gone bad, can someone help confirm this for me? thx

**Fivefingerdeathpunch** · 08-27-2012

I wouldn't say MSD ignition parts is a mod, more so junk parts that will fail.

But anyway, does the sound go away with the rise in rpms?

**PurpleGuy** · 08-27-2012

Could also be a tensioner/idler pulley. I had one so bad I thought it was the power steering pump

**1ATony** · 08-28-2012

Welcome to the site.

**KrashD13** · 08-28-2012

Sound goes away with any rise in rpm.....I checked idler pulleys when the belts were off, they all seemed in good shape.

Thanks for he welcome

**PurpleGuy** · 08-29-2012

Maybe a tensioner? Not the pulley but the actual tensioner itself

**KrashD13** · 08-30-2012

I did remove both belts.....rattle was still there

Just replaced the harmonic balancer........Fixed the rattle!

Now I have a little belt squeal with the A/c on plus the accessory belt seemed little loose when I pulled it. Gonna try a 1/2" shorter belt cause I dont think the tensioner is getting a good pull......I have non-OEM size accessory belt because the electric WP, guess its a trial by error with that

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