Question about 2003 Volkswagen Jetta TDI

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I have jetta 2003 engine 2.0 engine cannot accelerate beyond 2.0 rev/m meter and cannot speed beyond 100km/h even when the throttle is pressed down.

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If you happen to have a scanner you may use that to get the error codes to help identify the issue.

Observe if after hitting the said rev or speed check if the engine would seem to die on you. It may be related to the delivery of the fuel. Check first the fuel filters since this is a cheap fix. Observe if there is some excess noise or squeal near the fuel tank. IT could be the fuel pump. It may be going bad and fuel delivery may be poor. You may also want to check leaks, just in case.

Check also the cables for the high tension wire. You may not be firing on all cylinders resulting in loss if power. Check if all are firing, you can do that by pulling out each of the high tension wire at the end of the spark and see if there are sparks.

This may also be caused by a bad ECU.

Posted on Apr 04, 2011

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Hi VW fans a 2007 Jetta 2.5 liter with a


The problem that you describe is in no way normal. That six second lag that you describe is more than enough time to get you into a serious accident. I have experienced a similar issue on Mitsubishi automobiles. When the hold down on the throttle cable is holding the cable too tight (not enough slack in the cable) or if someone has adjusted the throttle cable to remove the slack causing it to be too tight it will cause a fast idle lag like you describe. On several fuel injected cars stick and automatic I have experienced the engine rev issue you describe. Every time it was fixed by setting the cable tension back too loose.
Another item, if the cable slack does not fix the problem, fuel injected cars are fitted with an Idle Air Control Valve (IACV). They are located on or by the intake throttle valve. The price range for most is $30 to $100. If they malfunction they will raise the idle speed by letting too much air go around the throttle valve raising the engine speed even though the valve is closed. You can check if the throttle cable is too tight yourself. The IACV may have to be checked at the dealer. Only the dealer can tell you if the problem is covered under warranty.
As always check to make sure that there are no loose vacuum lines under the hood.

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1 Answer

I wish to adjust the idle tickover speed a wee bit on a 2007 Ford Transit 2.2 Duratorq engine. It is currenlty ticking over at approx 800 rpm and is hunting at this rev. If I could raise it a wee as I do...


First ensure that the throttle interior is really clean, a surface layer of grime can upset the ECU's ability to meter and govern the air entering the engine. If the throttle body interior is found to be really oily and dirty check on the idle air control valve and make sure that it too is cleaned up. Next put the ignition switch in position 2 (on, but no start) and depress the accelerator fully and release. If there is an issue with the throttle position sensor this procedure can help the ECU relocate the throttle plate position. Start the engine and if it is still hunting locate the air mass meter (AMM) on the air ducting immediately next to the air filter and disconnect the electrical connection. Does this remove the hunting aspect?... the rev speed might change but for the moment concentrate on the evenness of the tick-over. If the idle is even when the AMM is disconnected but hunts when connected then look at replacing your AMM. Try spraying the AMM with no residue electrical cleaning spray to see if this improves matters.

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I have a 2003 VW Jetta GL 5 speed. Yesterday I


hallo
EPC means Electronic Pedal Control. Fly-by-wire for your gas pedal--instead of a mechanical cable that pulls an accelerator linkage on the engine, there's an electronic device on the gas pedal, an electronic device on the throttle body and a wire between them.
You should check the sistem with diagnostic tool.
Marko

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1 Answer

Is this a problem with the throttle body?


the throttle housing must be adapted to the engine control module. it will take a scanner or a tool like vag-com. good luck.

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4 Answers

Ok... chev blazer 2003 is accelerating on its own..


might wanna check ur throtle position sensor

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