What might cause high EGT?

[Drifty Midship]

I've got a stock IS200 that when I bought it had a bit of melting on the rear bar around the muffler tip.

Originally thought that the prev owner had just backed into something causing it to melt. But now noticed it seems to be getting worse. Sometimes after hard driving I think I can smell it when standing near the rear of the car. Never seems soft or burnt tho'.

So after a bit of googling I've found these CF sheilds that you can put on to stop this (or cover up damage). They say they are designed for aftermarket mufflers etc. (might have had one on before that the prev owner took off b4 selling???)

So, having a tendancy for thoroughness, I would like to ascertain the cause of the tip being obviously hotter than it is intended... The stuff I've read, no one seems to care about the cause, just the band-aid solution.

So basically anyone got any clues to why my IS seems to have higher than normal EGTs?

Any advice appreciated
Cheers

[Norbie]

High EGT's are usually caused by retarded ignition timing or lean AFR's, but being a stock IS200 you can rule both of those out. Perhaps the tip is simply too close to the rear bar?

[oldcorollas]

stock tip and stock bar?

CF is only as good as the resin it is set in, and probably not so good. you are better off making shield out of two sheets of thin aluminium...
or you could use that ACL crinkly shield stuff...

or increase distance between tip and plastic?

[Drifty Midship]

Thanks for the replies.
Yep all stock... The tip is placed just like every other IS. And the mounts are solid... IE grab tip and cant move the zorst assy around at all... So it's not bouncing up and hitting the bar.
Maybe I need to check teh timing... prev owner had messed with a few things so they might have messed with that. Seems a bit low on power down low... but I've never driven another IS so I don't know!?!?!
The guard is by ATTAIN (JP). CF in Kevlar. How would that go...?
I'm thinking the CF would look out of place enough on the stock car... colour is Anthracite though which is similar to CF (Page 3 of my members ride thread). Alu would stick out like dogs nuts...

[oldcorollas]

Alu would stick out like dogs nuts...

i reckon a burning bar would stick out more

are you sure the exhaust pipe is actually hotter than any other one? nothing wedged up under there making the smell (dead rat or whatever?)?

if the tip was that much hotter than usual, then you would think the rest of the exhaust system would be pretty damn hot!

find IR temp sensor, find another IS.. warm up and drive em both the same and see the difference in temps along the exhaust?

[Drifty Midship]

got the IR temp sensor (work)... needs another stock IS ...
I have thought that the car is pretty hot. Temp gauge is fine but with driver window open I feel a lot of heat coming from under the car.
What about crapped out O2 Sensor...?
Cheers again.

[allencr]

Trying to diagnose a supposed engine problem by looking at a piece of melted plastic, that is a 'known' problem with aftermarket cosmetic cures?

Yes, exhaust systems are hot.
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Year,make,model, HOW many km/mi?

[Norbie]

EGTs high enough to melt the bumper would have to be caused my a major failure, not something minor like a broken O2 sensor. Remember the exhaust gases cool significantly by the time they reach the back of the car, so if the tip really is getting that hot imagine how hot the headers would be? Methinks they'd be glowing orange, and half your engine bay would be melted/on fire.

As for timing, is it even possible to alter this on a 1G-FE? Do they have a distributor?

[MR22ZZ]

depends what the bumper is made from, not all plastics are created equal.

[toddw]

I also have an IS200 or to be more specific my wife does and I get to wash and service it and if I am really lucky polish it. Anyhow it is the sports luxury and has quite a large chrome tip that is on the muffler. It is definatly factory and is part of the muffler with factory welds. It is quite close to the bar and does not get hot.

I remember when I did a couple of years as a mechanic at a Toyota dealer and I had to work on a Cressida that was getting really hot and had a bad smell from the exhaust. It turned out that the exhaust was getting that hot that it was melting the underbody sealant and has almost destroyed the exhaust mounts from the heat. I replaced the complete exhaust and it solved the problem. All I could put it down to was some sort of blockage causing this.
Perhaps you can drill tiny hole upstream and downstream of each muffler and measure the differential pressure or some exhaust shops can do this also. If it is rooted don't go aftermarket on a car like that as it will devalue the car with some dogey system.

Hope this helps you out somewhat.

Cheers
Todd

[cambelt]

IS200,s have a pessure flap inside the rear muffler that opens under hard throttle (makes the exhaust quiet under normal throttle opening and free flowing with the pedal down), maybe its not opening causing a pressure build up .
Dave