1991 Volkswagen Jetta Q&A
1991 Volkswagen Jetta Question: weak of power
The reason why your car is running on three cylinders must be determined. It could be a bad spark plug or plug wire, it could be a failed fuel injector, or a problem with in a cylinder of the engine. Determine first if it is an ignition problem (check spark, remove spark plugs and inspect), "listen" to the fuel injector. Using a mechanic's stethoscope (or use a long screw driver placing the handle end up to your ear place the metal tip end of the screwdriver against the body of the fuel injector), get a friend to crank over the engine while you "listen" to the fuel injector listen to each injector at the same point of the injector body. You should hear click, click, click as the injector is electrically opened and closed by the computer, if the injector is not being triggered you will not have fuel getting into that engines cylinder. Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info. and get an online repair manual subscription. Hope you can enjoy all the snow up there this weekend. I hope to go to Tahoe next weekend! - patrick mannion
Throttle body failure is not uncommon and can lead to shifting issues with the automatic transmission and other drivability concerns.
Car has 245.000 miles and nearly stalls when put into any gear. Replaced plugs, cap&rotor, tested coil, fuel pumps also. On very fixed income, what next ?