How do you tell if your manifold is cracked?

[Double Down]

I have a 97 4.0 with 76,000 and was wondering how do you tell if you manifold is cracked? Where would it be cracked? Would you hear anything from under the hood?

Thanks,

Chris (Double Down)

 

[Stick]

The last bolt in the exhaust manifold is probably gone.

You getting a popping sound from the engine compartment when you first start up?

 

[89xj]

mine would make a ticking noise that would increase with acceleration.

this should be on the oem board.

 

[8Mud]

Mine popped on start-up the other day. Had a buddy start it, while I held my fingers up by the joints. Just run it for a moment or two, it gets hot quick. Found two cracks one, on the first joint, of the number six cylinder pipe and another at the Y before the flange.

 

[Double Down]

My bad, forgot which board I was in. All that happens on mine which has been driving me crazy for the past 3 months since I bought it, is when I start it up and then start to accelerate 80% of the time I get this clunking, knocking, etc sound and the jeep won't accelerate. It's a 97 XJ 4.0 and it only does this on low speed, not driving highway. I does this for about 5-10 secs and no matter how much I push down on the accelerator it just keeps knocking, clunking then it gets gas and is fine at least until I slow down again and then it at idle it will keep doing this almost like the engines being choked or not getting enough gas...who knows.

I will check on the manifold cracks, but any ideas?

Chris (Double Down)