Well i have join EGR valve problem crew a 2002 model after spending 1000s pounds modifying my Jazz-bit, and start to get a jerky feeling from the engine area. At first i have spent a lot money diagnose the problem, but no mechanic was able to tell me the issue i was experiencing as no codes was showing up.
Eventually in a few months later the engine management light showed didnt know whether to feel good or unhappy about this light.
Nevertheless a trip to my trustworthy acha people, diagnose it was the EGR valve malfunctioning and blocked with carbon causing it stick open.
They cleaned it out and said it was a temporary job and soon or later needed to fit a new, only supplied from reliable Honda costing 250 sterlings. You see like most motorist here do not want to spend that kind a of cash on a small unit that you wont see unless you lift the hood. so is it worth it? I rather spent it on some escorts to be honest.
Welll the things on certain vehicles the EGR is vital to keep the car running smooth but if its blocked it caused alot a fumes in diesel, or juddering in the Jazz, or it could cut out at junction (highly dangerous) and you keep stalling and re-starting the engine causing the battery to go flat, This the worst scenario, ive encountered with a EGR valves in my work vans. Back to my the point.
On the Jazz is a connector to the EGR, (easy to locate, a black cylinder to the left) if you unplug it it will run smooth again but you will sacrifice fuel efficiency around 36mpg. showing on my dash. if you plug it in again the kangaroo will jump back again.
I have unplug it for 6 months straight not a big drop to the fuel and i have use it every day for work and going around, at least its not annoying and jerking in the traffic.
Its a Jazz it was never meant to be quick, but i have decided its better to get a new valve fiitted as i got bored with the Escorts