Mechanic said this noise was normal?

[BeatArmy18]

‘97 4.0 Manual 136k miles. Have this ticking noise when accelerating, gets louder with more throttle. Mechanic said the noise checked out and was normal but I can’t seem to agree. Can I get some thoughts on what it could be?

The video I have was from today, in 3rd-5th gear, accelerating, anything throttle above 1800 RPM and gets continuously louder. No noise at idle or out of gear. Sorry for the wind noise, had the doors off.

 

[TheBoogieman]

I couldn't really tell by that clip with the wind noise. Mine had a loud ticking when the manifold had a crack in it. 97-99' 4.0L had that issue.

 

[bromel]

Almost definitely a cracked exhaust manifold. Extremely common for 97-99 models. The later models had a two-piece manifold that solved the problem.

 

[Irun]

With the hood open, stand by the exhaust manifold. Have someone put a rag over the exhaust pipe, while it's running, and see if you hear an increase in the ticking noise.

 

[Krusty_tub]

Mine did that, found a crack in the manifold. Pulled the manifold off and welded it, threw it back on. Noise gone

 

[macleanflood]

What's your MPG? Any codes?

-Mac

 

[BeatArmy18]

Thanks all for the replies, I assumed it could be a cracked manifold after seeing it so much on the forum.

Not sure my MPG, I’ll have to check but I haven’t noticed it being thirstier than usual.

 

[BeatArmy18]

Also have no codes appearing

 

[Gollywomper]

Exhaust leak. If your mechanic said it was normal……find a new mechanic.

 

[Krusty_tub]

Exhaust leak. If your mechanic said it was normal……find a new mechanic.

2nd this, sounds like dem lazy hourly guys

 

[BeatArmy18]

Exhaust leak. If your mechanic said it was normal……find a new mechanic.

Yeah absolutely agree. No worries though, just part of the learning process for me!

 

[BabyBass2]

Yeap a manifold crack or a bad manifold gasket. A Sound is normal, noise is never normal.

 

[BeatArmy18]

I'm going to replace the manifold and gasket soon. While I'm doing it I'm going to replace the rest of the exhaust by a shop around SD.

 

[BVJeep]

Yep, agreed