Question about 2004 Jaguar X-Type

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Black smoke on hard exceleration.serviced may

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  • yadayada
    yadayada May 11, 2010

    any trouble codes in memory?



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Check for

vacuum leaks on intake manifold,

the air tube between the air filter.

intake manifold vacuum hose.

clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE

Also remove carbon built up behind the EGR valve and the EGR passage tube.


Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.

More un-metered air (leaks) will lean out the fuel mixture.

Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.

At idle,just spray and listen for the RPM surge.

The in-rush of carb clearer will increase the RPM on the motor.

Record the problem spot(s) and address it later.


EGR carbon built up require 2+ hours to clean from start to finish.

You will need a new EGR base gasket before your start.

Locate and remove the EGR valve after the vehicle is cool down.

Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.

Remove the EGR valve.

Inspect the location of the carbon built-up inside the valve and the EGR passage tube.

SOAK these areas with WD-40 spary.

You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.

RE-SOAK the carbon and let it sit for over-night will also help.

One the last round,pass a shop vacuum of the EGR valve and the passage pipe.

Install the new EGR gasket and connectors.

Allow the vehicle to warm up outdoor to burn up any remaining WD-40.

Take it for a test drive.

Please rate my answer if it's useful to you.



Posted on Dec 19, 2009

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Check for split induction hose onto egr valve, and check egr clean.

Posted on Sep 16, 2009

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Too much oil maybe

Posted on Sep 10, 2009

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