Question about 2002 Volkswagen Jetta TDI

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Lacks power my car vw golf tdi 2002 lacks power the rpm will never go above 1500rpm the car gradually picks up to 100km over about a 4 kilometer stretch. if we hold the pedal about quater inch down the car will gradually pick up speed but you need to upshift before rpm gets to 1500rpm or nothing happens after 1500 rpm. at a idle if I floor the car the rpm will raise 1100rpm but never go above that.I thought it was the the catalatic converter so I replaced it then I replaced the fuel and air filter.still the same once the car reaches speed it has no problem staying at that speed but its getting iyt up to speed. the car threw a code about 6months ago #3 glow plug I havent replaced it yet. The mechanic told me that the glow plug just heats the oil on a cold start and once it runs then the glow plugs are not used.So I figured its still mild so replace it at a later date once I get the problem with lack of power fixed

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  • johnbinder40 Nov 01, 2008

    I can smell a strong smell of diesel in the exhaust with a lot more black smoke more than usual.

  • Anonymous Mar 24, 2009

    someone told me to unplug the mass airflow sensor this will trick the computer but when I did that the same thing. Now the car when it starts there is a lot of black soot coming out the tailpipe. Someone also said its the turbo if its the turbo is there a way of testing the turbo???? Is there a way of testing the mass airflow sensor

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Check the mass airflow sensor. When bad, there is reduced power and the computer uses a default setting

Posted on Mar 24, 2009

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Replace the mass airflow sensor. Trust me!

Posted on Apr 18, 2009

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Www.myturbodiesel.com describes numerous ways the trouble shoot what he calls "limp mode."

I had this happen to me today and it was the needle life sensor on the #3 fuel injector. I checked the resistance of the sensor and the sensor is good.

I finally corrected the timing issue I had with my camshaft being off a tooth and the "limp mode" was instantly gone. Keep in mind I had started and stopped the car several times and did not reset the computer. On the first start up, the issue was gone.

There is always the possibility of the fuel pump being bad, however, I would check the cheap stuff first as I haven't seen a fuel pump cheaper than about $1500.

So, needless to say, it looks like the Mass Airflow Sensor may have done the trick for you, but, I did want you to at least know there is more than one potential as I had a complete loss of power when my car went into "limp mode."

Posted on Apr 06, 2009

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I have hear that there the lift needle sensor is on glow plug #3 and the malfunction of that sensor can cause a dramatic lose of power.

Posted on Apr 01, 2009

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Sounds to me like not all valves are fully closed at ignition stroke
try putting some Redex through the fuel system in case it is a carbon build up at inlet/exuaust valves which wont allow them to close properly. Sniff exaust gasses for smell of unburnt fuel.redex will also clear dirty injectors which could be another source of the problem.
this failing to solve it after a week or 2 get yor engine timing checked by a garage

Posted on Nov 01, 2008

  • Andy Bathgate
    Andy Bathgate Nov 01, 2008

    if none of these work replace the pump

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