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Need some help diagnosing this problem:

Just bought an FJ60, fired the engine up, sounded good. As we check everything out (vaccuum leads, hoses, etc.), notice that the exhaust gas pressure is strong. Continue to play with things as the motor warms up. It revs up good, no noticeable hesitation, sounds strong. After about 15 minutes, my other buddy checks the exhaust and yelps as the gases burned all of the hair off the top of his hand. It was really hot. The exhaust manifold looked normal (was not glowing red), and the engine temperature was normal. Looking under the vehicle-also no glowing.

Our first thought was that the catalytic converter was bad. However, it has a thermosensor and no idiot light (or other signal) was going off. Also, I was told that if the cat was bad, I would not be able to rev the motor up. Any thoughts there?

Another mechanic suggested that I might be running lean. I live in Colorado at 9000 feet elevation. It should be running rich, if anything. Is there any way it could be running lean (faulty emissions equipment? there's lots of 'em)?

Final note, I bought it with no clutch (great price), So, It's sat at the previous owners for almost a year. It has not been out on the road and opened up-driven. I don't know if this could have any bearing . . .

Any insights would be really appreciated. Thanks,
 

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Hard call -- just some thoughts.

You mentioned excessive back pressure (I think that is what you meant). I've had older vehicles, that sat for years, plug up the exhaust system due to internal rust breaking loose, then clog everything. Normally you're fine at idle, and moderate speeds, but run out of breath trying to get up to freeway speeds.

Ignition OK? On the old (cough, cough) Heep... 360V8 that liked shaking plug wires off. Didn't notice a difference in power when a ignition wire fell off, but that extra fuel into the cat would get things HOT. In my case the catalyser would really glow and torched the cardboard (catching oil dripping) on fire. Should have let the J**p burn to the ground (less painful).

As to the idiot light sensor... OEM catalyser was something like $500, generic replacement was $120 (no sensor fitting). Not as
common to find a OEM replacement, hence no sensor.

Tom :usa:
 

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The cat's thermo sensor turns off the air injection into the exhaust pipe when the cat gets hot. About +1400 degress F, if I recall correctly. There is no idiot light for the cat temp.

You might consider further experiments to precisely determine the flash point of your buddy's hair. It may well be below the normal exhaust operating temp. ;)
 

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Could it be running lean? That would give you a hot exhaust and stuble.


Edit: Whoops, just read your original post!
 
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