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On 26 Apr 2004 at 19:45, type3@comcast.net wrote: > Greetings Type3 folks - first time posting. > > Car = 69 Square all stock 1600 with FI intact. > > Did a full tune up this weekend - plugs, wires, cap, rotor, > points/condenser. Car runs beautifully down the road - however after > this tune-up, the car runs rough when cold (like no choke). Once the > car warms up its fine...just the first start in the morning when it > idles rough. I can feather the gas pedal and raise the RPM and that > helps smooth it out and warm it up...then it idles fine. Do you know which Brain your FI has? The early "A" brain had some trouble running too rich and it would sometimes run rough until it warmed up and leaned out. I have found that I could "fix" this by just driving 1 block normally down the street and then taking my foot off the gas to let engine braking pull air thru the engine. This seemed to flush out the excess gas and then when I reapplied the gas I'd find that all 4 cylinders were firing. > I have a Bentley - and I've read the fuel section thoroughly - just > seems that the manual tells you a lot about how to remove/replace > parts but not what those parts do. Does the cold start valve provide > a steady flow of extra fuel - or just one spray? The CSV only sprays when BOTH of the following conditions are met: 1) The starter is cranking. 2) The engine is at a temperature below the trip point of the temp switch. This temp varies by year between 10 and 40F. It's not likely active this time of year. One more thing. If your voltage regulator is worn out and regulating at too low a voltage, this will also make the FI run rich, which will make any other richness problems much worse. This is a common problem. You should measure a voltage of more than 13.5V at the battery with a warmed up engine running at medium RPM. If your voltage is lower than this, replace the VR with a genuine Bosch 30-019. This is a common problem with the FI cars. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org