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Tractor Talk Discussion Forum

Re: OT: 2000 GMC 2500 egt problem

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Bob

07-27-2006 11:22:26




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Sounds completely normal to me. I have a 2001 Yukon with the 5.3, and it does the same thing.

The "cats" are designed to run HOT to clean up the exhaust.

About the only things that could cause an ABNORMALLY hot exhaust are late timing, or a cylinder overfueling or mis-fire issue, and the OBDII computer would be all over either of those issues RIGHT NOW, and light the MIL lamp!

I think you are worrying about a complete non-issue, and have WAY to much money if you are thinking of throwing premium gas at it to counteract the hot exhaust issue!

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Kevin

07-27-2006 12:12:13




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 Re: OT: 2000 GMC 2500 egt problem in reply to Bob, 07-27-2006 11:22:26  
It funny you mention a misfire issue. When going down a long downhill grade sometimes my check engine light will turn on blinking. I checked the manual and it claims it means there is a misfire condition. Once i get going good on a flat grade or back up hill the light goes off. And i never notice it misfiring either.



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Bob

07-27-2006 12:17:30




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 Re: OT: 2000 GMC 2500 egt problem in reply to Kevin, 07-27-2006 12:12:13  
Get a scan tool on it. If there is a mis-fire, it will even tell you which cylinder, and, in any case, it will show you the trouble code that is causing the light to come on.

It may be anything from a minor emissions "glitch", to something more serious.

Funny you didn't mention the MIL light in the first place!



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