catalytic converter red-hot! - Nissan Forum
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post #1 of 12 Old Mar 19th, 2005, 09:26 PM Thread Starter
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Unhappy catalytic converter red-hot!

What could cause my catalytic converter to overheat after a block or 2? It's not clogged, I'm told by a muffler man (there's plenty of exhaust air pressure coming out of the tail pipe). It vapor locks, too and won't start back up til it cools off- 30-40 minutes. The distributor cap's ok; new dist. rotor; new plugs; plug wires look fine; new fuel filter and gas cap. And it passed inspection yesterday! (And then left me stranded!) If the list of possibilities is too long, what kind of situation might be the prob? Not enough oxygen mixture?...If the original timing was off, could it cause this kind of thing?
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post #2 of 12 Old Mar 24th, 2005, 10:14 PM
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The cat (or the muffler) is clogged, although it is not completely blocked but allowing a bit of flow and causes the heat to build all the way back up into the engine from the excess back pressure thus the "vapor lock" condition. If the muffler shop would pull the O2 sensor and install the back pressure gauge this would confirm the condition.

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post #3 of 12 Old Mar 25th, 2005, 02:57 PM Thread Starter
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So how do I find out what's causing it to clog? And does this mean I'll have to replace to cat.? (As far as you can tell)
Thanks for responding, too.
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post #4 of 12 Old Mar 26th, 2005, 12:04 AM
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I think it does mean you will need to replace it. Sometimes the additives in fuel can cause the honeycomb to sulfate up or rust scale can restrict the flow. But first I would try pulling the muffler off to inspect that and eliminate that if it is part of the problem.

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1992 S13 240SX SE Fastback KA24DE 5 spd
1993 U13 Altima SE KA24DET 5 spd
1990 Z32 300ZX VG30DETT 5 spd
Still trying to import a 1988 R31 Skyline GTS-R w/ RB20DET-R
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post #5 of 12 Old Apr 1st, 2005, 11:39 AM
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Consider also the gas mix being out of whack. The catalytic converter evidently is working "overtime" so, if it isn't clogged, the fuel/air mixture might be wrong. A quick start to for this kind of trouble is looking at the spark plugs. If they're fouled or wet or showing any other anormality that could be a sign of where the problem might be.
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post #6 of 12 Old Apr 1st, 2005, 11:43 AM
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Oh! btw, I think your temperature sensor is bad and that also screws up the air/fuel mix. Have it checked.
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post #7 of 12 Old Apr 11th, 2005, 06:31 PM
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Definitely clogging of the ceramic honeycombing in the catalytic converter. Your car just passed an inspection, so I would just remedy this by punching holes in the catalytic converter with a long chisel (I used a screwdriver) and a hammer. In fact, I just hollowed out the entire cat.

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post #8 of 12 Old Apr 15th, 2005, 05:05 PM Thread Starter
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Won't that make it really loud and/or smoke? (Just punch the hole straight thru the bottom, or what?)
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post #9 of 12 Old Dec 20th, 2010, 11:33 PM
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Thumbs up red hot

you simply need to replace your crankshaft position sensor ( $ 20.00) im sure this is your problem.
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post #10 of 12 Old Dec 20th, 2010, 11:49 PM
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I'm sure the guy would've done something to fix the problem sometime in the last 5 years.

99% of the questions that are "STRANGE" have a dirt simple answer...usually answered by a dirt simple search.

NISSAN GOOGLE

Is it just me, or does the majority overlook the obvious?

Somebody ate a whole bag of dumbass for breakfast.

Why do people continue to run a vehicle when a warning light comes on or starts flashing? Isn't that a clue that something is wrong and you probably should NOT drive it?
Is this whole car driving thing really freekin' brain surgery?

Here's something new for the crowd/clowns...
"A little bit of Google goes a long way!"

Ever notice the one post wonders for info on turbo'ing a GA16 are never heard from again after they figure out the cost???

And if you can read this, you don't need glasses! :)

And yes, I am diggin' it...
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post #11 of 12 Old Dec 22nd, 2010, 02:03 AM Thread Starter
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No...Believe it or not, the car has just been sitting for the majority of the past 5 years.
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post #12 of 12 Old Dec 22nd, 2010, 08:05 AM
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But...but...but...but...
Alrighty then.

99% of the questions that are "STRANGE" have a dirt simple answer...usually answered by a dirt simple search.

NISSAN GOOGLE

Is it just me, or does the majority overlook the obvious?

Somebody ate a whole bag of dumbass for breakfast.

Why do people continue to run a vehicle when a warning light comes on or starts flashing? Isn't that a clue that something is wrong and you probably should NOT drive it?
Is this whole car driving thing really freekin' brain surgery?

Here's something new for the crowd/clowns...
"A little bit of Google goes a long way!"

Ever notice the one post wonders for info on turbo'ing a GA16 are never heard from again after they figure out the cost???

And if you can read this, you don't need glasses! :)

And yes, I am diggin' it...
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