The AC/heater (HVAC) system may unexpectedly switch to the defrost mode when accelerating. This system is operated by engine vacuum and should be inspected for any vacuum leaks if this problem develops.  There is also a revised vacuum check valve available to address this concern.

Some vehicles may exhibit one or more of the following: Spark knock complaints when the vehicle is under load, various single cylinder misfire, and surge in 4th gear (around 45 mph). Our technicians tell us that rerouting the coil and spark plug wires to minimize induction effects will commonly correct this condition. If wires must cross during the reroute procedure, they must cross at a 90 degree angle.

Leak detection pump failure can be caused by the internal diaphragm switch sticking, or in some cases, contamination from debris or carbon particles from vapor canister. If black carbon particles are present in the LDP, replace vapor canister in addition to LDP. The purge solenoid should also be checked for debris or carbon contamination and replaced as necessary. All evap system hoses are subject to cracking and splitting causing leaks, Inspe...

2 PART QUESTION, WHERE IS THE FUEL FILTER ON THIS VEHICLE AND WOULD THE FILTER CAUSE THE ENGINE TO HESITATE AND STUDDER ONCE IT REACHES 1/4 TANK OF GAS?

I HAVE REPLACED ALL THE LIGHTS INSIDE THE VAN AND THE INTERIOR LIGHTS WONT COME ON, ONLY THE DRIVER SIDE LIGHT WORKS FINE, THE REST WONT COME ON EVEN WITH A NEW BULB... IS THIS A SERIOUS ELECTRICAL...

I am pretty sure it is sending 12 volts to the pump but I just today found out which wire(s) to check at the relays. Could there be any other cause for my problem unless there is a short in yhe wir...