Join Date: Jan 2003
Location: Rapid City SD, Black Hills of South Dakota, Queens NY
JC - Have you checked you tach and speedo cables? Erratic needles are usually an indication of either cables that are unravelling, or need lubrication. Also, did you have someone follow you with another car with a known good speedometer to compare readings?
When you have you instruments out, pull out the center drive cable and inspect it. It could be also that the casing is damaged or kinked causing the inner cable to bind when it tries to turn.
As far as setting up your new fuel injection pump, it's best to have a tach. I use an electronic automotive analyzer instead of the car's tach. It's useful for seeing exactly what the idle speed is and also important for setting the mixture, if you don't have a exhaust analyzer (not many people do). Looking for 600-900 rpm at idle and for setting the mixture, you'll set the engine speed at a constant 2500 rpm, then adjust the mixture for peak rpm. An electronic instrument is more accurate and sensitive to small rpm changes that the car's tach.
Last edited by Roadtrip; 03-21-2004 at 08:49 AM.