behaviour when cold - warm Italian spring update

I don't recall the behaviour of the 1.8 K-jetronik after a cold start: if I press the accelerator all the way (bad thing, okay, okay…) does it accelerate smoothly or is it a little bit rough? Or should it behave exactly as with a warm engine?

Ben

Any older ! Engine will not be smooth till fully warmed up .

http://www.vwgolfmk1.org.uk/modules.php?name=Forums&file=viewtopic&t=10919


Gives some good guides to rough running , if thats what you have ?

Cheers……….

chudd said

Any older ! Engine will not be smooth till fully warmed up .
http://www.vwgolfmk1.org.uk/modules.php?name=Forums&file=viewtopic&t=10919
Gives some good guides to rough running , if thats what you have ?
Cheers……….

Will post a video tonight.

BTW. It starts flawlessly, even without pressing the accelerator, idle is perfect 800-900 rpm.

For the very first 1-3 minutes the engine is not smooth during quick acceleration, while it is normal if I press the accelerator gently.

I have had the same symptoms since the car was only 3 years old (< 15,000 miles).

I have tried several "experts", but nothing has changed.

Recently I have replaced the fuel filter and now the symptom is evident only after the overnight stop, but not after a 4-5 hours stop.

Ben

chudd said

Any older ! Engine will not be smooth till fully warmed up .
Cheers……….

Now that the Italian spring has arrived the engine runs smooth even after a cold start and even in the morning.

So my guess is that there is something in the fuel injection system that dos not work a temperatures below 10-15?C.

Any guess?

Ben

Warm up regulator out of spec, or mixture needs a tweak. If you have the tools to do it, you can measure the control pressure vs temperature of the warm up regulator and compare it against specification. for mixture, you'd need a decent and fast responding way of measuring mixture, eg wideband lambda.

What's the CO at idle once warm?