Side effects of a clogged cat?
- Thread starter Cody
- Start date
depending on the severity,
No accelleration up hill.
if you put a piece of paper next to the exhaust pipe and rev the engine it won't show much flow.
Cat glowing Cherry red catching stuff on fire.
The test for a catalytic converter is to drill a hole in the exhaust in front of the cat and behind and measure the pressure at both points, there should be a differential, but a high differential while the engine revvs is the giveaway.
yank the cat off knock out it's guts and put it back on, works for me. (unless you have to meet emissions)
No accelleration up hill.
if you put a piece of paper next to the exhaust pipe and rev the engine it won't show much flow.
Cat glowing Cherry red catching stuff on fire.
The test for a catalytic converter is to drill a hole in the exhaust in front of the cat and behind and measure the pressure at both points, there should be a differential, but a high differential while the engine revvs is the giveaway.
yank the cat off knock out it's guts and put it back on, works for me. (unless you have to meet emissions)
Tacoma
Et incurventur ante non
- Location
- far enough away
It would be hard to tell on a 4.0.....
....but all of the things those other guys said.
....but all of the things those other guys said.
well, my rig is gutless, but on the freeway it really overheats. On the trail--no problem. But if I try and push it on the freeway it will get 250* pretty quick and I'm tired of running with the heater on to keep it to a more manageable 240*. I've flushed the coolant and put in a new 180* t-stat. Still same problems.
I'm trying to think of problems that would only cause over heating at higher rpm's/load such as the freeway.
Fan clutch? Water Pump? Bad radiator?
I would think all of those would cause overheating at any rpm's--especially on the trail in 100+ degree heat. But it runs just fine in those situations. so I'm kind of thinking that maybe the coolant system is working ok, but the engine is producing too much heat--more than the coolant system is designed for--so what could cause that?
I have a free flow cat and it's only a year old. when I had the exhaust redone after the long arms the exhaust guy said the cat was bad--but I told him to put it back on because it was new and I didn't think it could be that bad.....but maybe it's causing my problem?
I'm trying to think of problems that would only cause over heating at higher rpm's/load such as the freeway.
Fan clutch? Water Pump? Bad radiator?
I would think all of those would cause overheating at any rpm's--especially on the trail in 100+ degree heat. But it runs just fine in those situations. so I'm kind of thinking that maybe the coolant system is working ok, but the engine is producing too much heat--more than the coolant system is designed for--so what could cause that?
I have a free flow cat and it's only a year old. when I had the exhaust redone after the long arms the exhaust guy said the cat was bad--but I told him to put it back on because it was new and I didn't think it could be that bad.....but maybe it's causing my problem?
at speed your fan shouldn't be locked/on the speed of the air going through the radiator should be enough to cool it.
Do you have a shroud on your radiator?
Could be a suction problem, a bad lower radiator hose can collapse, since you are holding your rig at a higher RPM it will be more evident then when you wheel and the RPM varies.
it could be a cat, but unlikely, have you noticed a drop in power/acceleration? (more then the ordinary 4.0)
Do you have a shroud on your radiator?
Could be a suction problem, a bad lower radiator hose can collapse, since you are holding your rig at a higher RPM it will be more evident then when you wheel and the RPM varies.
it could be a cat, but unlikely, have you noticed a drop in power/acceleration? (more then the ordinary 4.0)
It's always been gutless, bit it didn't seem any more gutless than some other 4.0 ZJ's with 4.56's and 35's I've run with recently. In fact, I was the only one to get up a couple of dunes out of the group so maybe it does a little better?
I'm thinking I may drop it off and have Dennis at T+ take a look at it. I think he's pretty knowledgable about the 4.0's.
DaveB
Long Jeep Fan
- Location
- Holladay, Utah
Another test to perform is a check to make sure the engine doesn't have an exhaust leak exhaust into the coolant from a head gasket leak. This kind of leak will cause it to overheat also. A radiator shop like JMac can do the test. Also make sure you don't have any air pockets in the coolant. My ZJ with a 4.0 never goes that high on the temps.
- Location
- Bountiful, land of rocks
4554x4
always modifing something
- Location
- Sandy Utah
Clogged Cat... Damned Hairballs...
JeepTJ38
AKA: THE MYTH
My brothers CAT started to clogg and over time took longer and longer to start untill finally it wouldn't even turn over. His also started to run hotter but not that hot. Bang on your CAT and listen for stuff rattling around in there.
gijohn40
too poor to wheel... :(
- Location
- Layton, Utah
interesting. I've heard that twice now. Worth a shot.