Vacuum Leak Problem?

[Stevenp]

I started my truck up as normal yesterday morning. When I drove off I noticed a brief hesitation and loudness in my exhaust. Just for a brief second or two!I tighten down all of bolts to my new intercooler boots and a couple of them needed to get snugged up.I scanned for codes but found none. I have a little leak coming from my canister but that was there before this happened.Where else can I look?Any help would be appreciated.Thanks,Steve2000 6spd. stock 270k

[Mopar1973Man]

Hmmm... How's the fuel pressure? How's the fuel filter? You might consider building a boost leak cap for the turbo and pressize the system to 20 PSI and soap the system down looking for bubbles.

[Stevenp]

Michael,The fuel pressure is great!I need to finish building this vacuum tester to check her out for any leaks.I can duplicate the noise if I stay at a low speed with a higher gear and accelerate a bit. The is exhaust noise only there for a second or two.Steve

[Stevenp]

oh yeah, i just changed the fuel filter too!

[Wild and Free]

Have you checked the exhaust manifold and gaskets for cracks or blown out gaskets also check the turbo and make sure the wastegate isn't stuck open.

[Stevenp]

I think that would be a good idea. I have not done that yet.I guess for the cracks I would be looking for any discoloration from the manifold right? Could I check the wastegate by putting a little air to the turbo hose inlet?Thanks for your feed back.Steve

[Mopar1973Man]

I think that would be a good idea. I have not done that yet.

I guess for the cracks I would be looking for any discoloration from the manifold right?

No there wouldn't be discoloration... It just air that passes through there...

Could I check the wastegate by putting a little air to the turbo hose inlet?

Yes... Build a cap and put a air chuck fitting in the the cap and hook to a air compressor with a regulator set no higher than about 20 PSI. Then soap the whole system down look for bubbles... MAP & IAT sensors, manifold cover, intake elbow, boots, intercooler, etc.

Thanks for your feed back.

Steve

Comments in blue...

[mopar440cu]

How do I build a boost cap? Got any pics of anybody's??

[Mopar1973Man]

How do I build a boost cap? Got any pics of anybody's??

Now just pressure the system to about 20 PSI and see if the wastegate moves too...