Fuel injection is actually a very simple system. Although troubleshooting it can sometimes get difficult. The ECU relieves information from the temperature sensor, oxygen sensor, air flow sensor, coil and throttle switches. I am not familiar with all the components on the Vanagon any more. With this information it adjusts the duration of the injector firing for proper mixture. The coil wire is only to tell where the distributor is firing at and nothing else. The fuel injection does not use the coil signal for anything else but that. It need to know when the plugs are firing so it can know when to deliver the fuel. The other stuff is for the rest of the mixture adjustments. There is a tap somewhere in the engine compartment for checking fuel pressure, get yourself a gauge and check it, this is a guess but I think it's somewhere around 30PSI. Also I believe your engine has a cold start valve, that's probably where you're getting the smell from. But by the same token it should fire on that bit of fuel and quit. So you should also check the spark to the plugs. Either pull out a plug or use an old one and check the spark right at the plug. Make sure it's getting where it needs too. Just a few quick suggestions. Good Luck >At 11:51 AM 2/24/97 -0600, vince_pappalardo@om.cv.hp.com wrote: > Here are some basic questions I am trying to find out: > 1) What systems control the fuel mixture (airflow meter?, does the ECU > control only the spark and timing or is it also tied into the > injection system)? > 2) How do you determine if the injectors are working properly (I did > not want to explore this on the side of the road with a hot engine!) > 3) What methods, tools, and tricks are known to help when diagnosing > VW FI systems. > Any help finding faqs info on these subjects or direct responses to > the problem would be appreciated. > > TIA, > > Vince
Greetings from Michigan's Upper Peninsula Jeff & Jean-Marie Diebolt mailto:jdiebolt@up.net
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