Question about 2000 Jaguar S-Type

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Extreme miss in engine

Started all of a sudden and has gotten worse. replaced all the simple things like plugs coils oxygen sensors, cleaned throtle body and still no improvement. I really need help, The car just rolled over 70,000 miles and is like brand new! And now isnt even drivable.

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  • mandinowens Jul 26, 2009

    It is worse at low rpm. I already changed fuel filter. And the plugs arent carboning up. Did check fuel pressure

  • mandinowens Jul 26, 2009

    It is worse at low rpm. I already changed fuel filter. And the plugs arent carboning up. Did check fuel pressure and mechanic said fuel pressure was great. im thinking it was like 45 or something. But miss is definatly worse at low rpms cause when at an idle it will sometimes stall, and doesnt have enought power to pull even a slight grade unless i keep the rpms way high by not letting it shift. If it is a vacuum leak how would i go about finding it? Thanks so much.

  • Kirk Augustin
    Kirk Augustin May 11, 2010

    Is it worse at low RPM or high? Low would be vacuum leak, high would be fuel filter. If plugs keep getting full of carbon, could be bad spark. If not, could be lack of fuel. Check fuel pressure with pressure guage. Check spark with inductive timing light.

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Hi ,
Ok you`ve done the usual components that fail now you need to plug into the system and read the live data and let the engine show you what it see`s the problem should be fairly obvious,you need to check the inlet hose for leaks and they also have a crankcase ventilation pipe under the inlet manifold that fails giving an air leak LeaN MIXTURE =MISFIRE the live data will show you the mass air flow sensor readings and also the engine coolant sensor can cause misfiring by over fuelling fouled plugs or black carbon deposits on the plugs,to be honest the possibilities are infinite unless you have the right dedicated jaguar software a simple code reader is ok but will only give basic data,hope this helps

Posted on Jul 24, 2009

  • dcs_bristol Jul 27, 2009

    Hi, from what you describe without looking at the live engine data,your not going to solve this you haven`t said if there are any codes in the system,I would also check the amount of gas coming out the exhaust and if it excessively hot as you might have a melted down cat causing a restriction,by disconecting the down pipes bfore the cat this would show up as the miss would disappear,but be carefull,

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