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1995 Jaguar XJ6 106,000 Miles 4.0L Engine

Tiny
CURLEDE
  • MEMBER
  • 1995 JAGUAR XJ6
I failed the emmissions inspection. I replaced the oxygen sensors and failed again. My HC ppm reading at 15MPH is 245 and my Co% is 4.20 at 15MPH. What else should I do?
Wednesday, September 26th, 2007 AT 10:43 AM

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Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Before we get too far, I am not familiar with Jags, but may be able to help regardless. What code numbers are in the computer?
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Wednesday, September 26th, 2007 AT 11:59 AM
Tiny
CURLEDE
  • MEMBER
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I don't have the tool to check the code is the issue.
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Wednesday, September 26th, 2007 AT 12:14 PM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Thats going to make it tough.

I assume the car runs great other than it fails the emmission. Probably working with a rich fuel/air mixture.

You need to start by checking the air filter, make sure it's clean and installed back tightly. Next your going to remove the Mass air flow sensor (maf) and clean it with ELECTRICAL cleaner (only) and very gently with q-tips. Reinstall the MAF and make sure no air leaks exist between MAF and throttle body.
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Wednesday, September 26th, 2007 AT 3:46 PM

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