Re check for an exhaust leak near the front of the system.
The manifold work is relatively new, but that doesn’t mean a gasket couldn’t be leaking.
Check the breather hoses from the rear of the valve covers to the air cleaner.
I am guessing your GC has the 4.7 L, you haven’t revealed which engine you have.
And if you can’t find the exhaust leak yourself, have a mechanic use an emissions tester probe to sniff around the engine compartment. The sulfur smell should register on the emissions tester, I would think.
to Jesmed:
it is impossible to find an old-style emissions tester in my town. I haven’t seen one in 10 years.
to Nevada: that is correct. will check them breathers.
to Circuitsmith: the manifold is 3 days old, as is its gasket.
When you smell it inside the car with the AC on, then if you get out of the car & pop the hood, can you smell the odor in the engine compartment area? Do you see any visible smoke or vapor trails coming from the engine compartment?
to George: the smell dissipates when I come to a stop, and it is gone by the time I open the hood. no visual evidence whatsoever.
revving it up idling produces nothing.
seems to be the worst when accelerating on an upgrade.
How about checking the oil pressure sending unit.
All of your symptoms point to an exhaust leak. A leak could be anywhere in the system, including the manifolds, pipes, and any joints. A leak could also be in the EGR system, including the riser pipe, crossover, and EGR valve itself.
the problem is that it smells different from the exhaust. being more sour, it only occurs when rolling, being the worst on an upgrade, and dissipates when slowing down. revving it up in park or neutral produces no smell.
however after it dissipates, I’ve noticed that it lingers for a minute out of tail-lights.
There is also a thin sticky film that accumulates on the windshield, BOTH INSIDE AND OUTSIDE, every 3-4 days, REGARDLESS WHETHER AC IS RUN OR NOT. It also accumulates when the truck is parked overnight.
I’ve been trying to sell the truck, but all the potential buyers smelled the problem.
Any chance the “thin sticky film” is coolant?
I think you have coolant leaking out the ends of the heater hoses where they attach to the heater core at the firewall. Probably doing that ever since they replaced the heater core.
sautscheck
Did you figure out the problem with car fumes?
I think I have same problem.
Yes. Unfixable. Exhaust manifold gasket couldn’t be sealed due to rust on the engine surface under the gasket. Manifold separated when the engine got hot.
How did you test and detect manifold problem?
So what happened to car?
Thanks!
Traded it in for complaint-free Kia Sorrento.
A couple of colleagues in film industry (picture car specialists) told
me it has been was a common Jeep problem for at least 20 years that
Chrysler refused to acknowledge.
It only becomes detectable when engine warms up sufficiently at cruising
speeds. Idling in the shop is not sufficient to crack the
manifold away from the engine.
Get rid or yours ASAP.
Good luck!
My mechanic DID TRY fixing this early on “the best he could”.
It was a mistake to think it was fixed (or even fixable).