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1993 460 running rough and fumey

 
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Old 01-19-2016, 11:40 AM
wahlturfcare
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1993 460 running rough and fumey

lately my '93 truck started running rough and has been getting pretty fummy from the exhaust where it is strong enough to get on your clothes. It is the worst when the truck idles.
I did pull codes dtc311 and 332 during the KOER test.
I also noticed the front if the intake is wet around the gasket area. Would a leaky intake be causing this?
 
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Old 01-19-2016, 11:50 AM
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IMHO it's almost pointless to run the KOER tests. Start with Key On Engine Off (KOEO) and stored code (aka Continuous Memory) display.

Others may disagree.

FWIW:

Code 311 (KOER): Thermactor air system inoperative (right side)
Code 332 (KOER): EGR valve opening not detected.
 
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Old 01-19-2016, 12:17 PM
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I tried and I couldn't get it to bring up any stored code's.
 
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Old 01-19-2016, 03:56 PM
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If there's no check engine light, there may be no stored codes. The thermactor code may be the cause of your fumes though - that's the air injection system and I believe it's necessary for catalyst light off.
 
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Old 01-19-2016, 04:22 PM
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Originally Posted by wahlturfcare View Post
I tried and I couldn't get it to bring up any stored code's.

If the truck will run the KOER tests it will do the same for the KOEO. As well. The CM (stored) codes are displayed after the any KOEO codes are displayed.

Keep in mind if all the KOEO tests pass you will get the System Pass code of 111. There will be a separator pulse that some code readers interpret as Code 10, this is false. Once the separator pulse is triggered any stored codes will be displayed. If there are no stored codes you will once again get the System Pass code 111.
 
 
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