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Re: Questions on Emissions

To: Shop Talk <>
Subject: Re: Questions on Emissions
From: Jim Franklin <>
Date: Fri, 09 Sep 2005 09:34:53 -0400
On Sep 9, 2005, at 9:14 AM, wrote:

> OK, after spending housr replacing a cracked exhaust manifold on my 
> SO's
> car.  Not to mention fixing the horn, e-brake, and a bunch of other 
> little
> things, followed by a good cleaning.  The car failed for emissions.
> Now, it's a 1995 Jeep Grand Cherokee 6cyc.  (95, so I cna't use my
> scanner!) 8>(
> The failure was for high HOx levels.  1057 was the limit and she was at
> 1345 (from memory)

My 90 4.0 Cherokee would "require" an O2 sensor almost every year. 
Replacing that, and making sure the engine was good and hot before 
testing, got me to pass. It's entirely possible the O2 sensor was only 
slightly degraded after a year but still in spec and that something 
else was wonky, and together that caused the failed emissions, but I 
never looked into it. Might want to check your EGR valve operation 
since you messed with the manifold.


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