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Pco300 error code on 2001 citroen xsara picasso

Car only seems to misfire in damp conditions and runs fine in the dry . i connected an obd2 code reader and dtc code scan came up with pco300 (random/multiple misfire) i presume its either plugs,ht leads or maybe a sensor problem but,think the first 2 options maybe more likely,as the engine only seems to misfire in damp conditions

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 178 Answers

SOURCE: maf?/ missfiring

have the map sensor checked to see if it is within range you say you have codes maf make sure all clamped duct work is tight and not loose clamps .iac motor clean bore if the pintle gets stuck will cause rough idle hesitation even no start conditions scan tools only test the idle air control valve motor not the bore that extends to block varnish gets built up on the pintle and in the bore wich binds the in and out operation

Posted on Sep 12, 2008

  • 1 Answer

SOURCE: 99 4runner 5vz-fe 3.4 misfire

I know this post is old, but right on the engine theres a sticker that says use multi-ground plugs only. I read a similar problem like yours and it seemed to turn out that the spark was arcing to ground over the ceramic on the plug. So maybe it could have something to do with the single ground plugs.

Posted on Jan 23, 2009

csmock132
  • 4669 Answers

SOURCE: 2001 2500hd 6.0l multiple cylinder misfire at higher rpms

If you have someone scan it with a scan tool that gives you data stream they can tell you exactly what cylinder is doing it. You might have a bad coil or wire.

Posted on May 16, 2009

keithheavili
  • 410 Answers

SOURCE: 2001 audi a4 CEL came on

I would start with the cylinder 4 spark plug and make sure it look good and is firing correctly.  After that I would look either at the final coil, ignition module and then o2 sensor.  These problems are so hard to diagnose and are trial and error so much of the time.

Posted on May 19, 2009

  • 1 Answer

SOURCE: 2003 Silverado 1500 HD 6.0 Liter starting issues

I am having the same issues on my Chevy 03 HD 1500. It takes at least two turns of the ignition to get it going. I have replaced the battery, Fuel Filter, Fuel Engine Relay and I am now Replacing the Starter Engine Relay. If you have any other suggestions let me know! I will share as well. Also, last couple of days Oil Pressure Gauge is acting strange. It will read from 1/4 point to 3/4 point while driving. Working on that as well.

Posted on Sep 10, 2010

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