[Turnmireauto]

I have a 2003 jetta tdi, starts hard,smokes, has low power, has code 17656 start of cold start injector control difference. Can anyone help me to find a fix for this car?

 

[chittychittybangbang]

Here is a start: check the fuel lines for air, check the injection pump timing (use the timing belt article to find TDC and check the pump timing from there) when was the fuel filter last changed?

http://wiki.ross-tech.com/wiki/index.php/17656/P1248/004680

Possible Symptoms

• Loss of Power at high Engine Speeds
• Engine difficult to Start

Possible Causes

• Start of Injection Timing Regulation not OK
• Injection Pump Control Range blocked/dirty (e.g. by Metal Particles)
• Engine has stalled / ran out of Fuel recently
• Wiring/Connectors from/to Injection Valve (N108) faulty

Possible Solutions

• Check/Adjust Injection Start
• Check Fuel Supply
• Check/Replace Fuse(s)
• Check/Repair Wiring/Connectors from/to Injection Valve (N108)

 

[Turnmireauto]

filter was changed last week,it was running good. then tuesday morning started acting up.

 

[Turnmireauto]

there is some air in the fuel line. and the timing is on. what else can i check on it. thanks for help so far

 

[chittychittybangbang]

Check wiring to injection pump, all battery grounds, or it's an injection pump fault. If it's traced down to a fault N108 off the top of my head it's replaceable but I can't remember if it's replaceable on the car or if you have to remove it.