Hi everyone... Please help, I am in in Audi world...
I have Audio B4 94, 2.0E 16v 4 cyl
I have this strange problem.. Car runs great, starts well, np, even when its very cold.. But as soon it rains it will not start. Last time I had to remove the spartplug clean then (over fuleded) and then it started...
it looks to me that the spark is week.. This is driving me crazy since I never know if it will start in morning or not...
I have replaced sparkplugs, plug wires, rotor and cap.. No ECU errors..

help and adivse...
only think that I can think of is distributor coil or hall sensor.. But I think Hall was replaced last time when rotor was replaced...

thanks

 

You probably have a bad chassis ground or corroded connectors. Not uncommon once any car gets over 10 years and often overlooked problem with older vehicles resulting in the replacement of many good parts with new and expensive ones. I had a similar problem with my Mitsubishi truck that took me a while to figure out but now she runs great and fuel mileage has improved by 50%!

Start with the battery terminal and move to the engine bay. Unscrew, unplug all connections and check for rust and white powder on the plated contacts. Also check for worn or cracked rubber boots and insulation. Clean with fine sandpaper (400 or 600 grit) or a special fiberglass brush. I have also used steel or brass wool but you have to be careful, any strands will be sure to cause a short. Once nice and clean apply a thin coat of silicone based electrical grease made specifically for contacts and is available at most auto parts stores.

 

My advice: Change distributor cap and rotor+wires. My dad had the same prob with his van, changed them, and now it starts fine when its wet out.

-Teemu