Question about 2002 Volkswagen Jetta TDI
Check the mass airflow sensor. When bad, there is reduced power and the computer uses a default setting
Posted on Mar 24, 2009
Replace the mass airflow sensor. Trust me!
Posted on Apr 18, 2009
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
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
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
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