Thread: 99 GP 3100 engine noise

Just got this 99 guy told me it needed a fuel pump (it did),started it up,thought the tick tick was the familiar piston slap I've heard on so many 3.1's.But as the engine warmed up the noise didn't go away.I can make the noise stop by disconnecting the plug wire to the center plug on the front(is that #2 or #4?).Is this a rod knock or could the valve train,say a collapsed lifter be causing this?

Have you checked that plug is torqued down correctly? A leaking plug could cause a tick

Originally Posted by Russosaur

If you can get a video and upload it, it would help a lot.

Here's a video. Loud noise goes away with #4 plug unplugged,still has noise,possibly the normal piston slap.

Did you ever figure this out?

Originally Posted by michael redmon

Did you ever figure this out?

Gave the car to my daughter as is,she`s been driving it as is for the last 2 years,even some long trips (6 hours).Noise never gets worse,engine has good power.Embarrassing when you start it in a parking lot full of people,but she doesn`t seem to mind.

Funny it keeps rolling along. My car is loud as heck also but runs nice.

So this is basically my car also except the noise only occurs under load. So if at idle and I rev the engine the. Nothing. Driving under load and I give it gas I get.the noise.

Any ideas? I would like to fix it.

Sounds like a valve train noise..a.rod knock is usually a lower sounding thump...that sounds like a lifter or valve...did you pull the valve covers and inspect and run the engine?