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Originally Posted by bueller68
Seems to run fine except in park or at a stop (chugs). Just replaced spark plugs. Engine light still on. EGR?, Fuel filter? Don't know. What other possible scenarios?
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Before doing anything else you need to check for codes since your check engine light is on.
Here is the procedure to retrieve codes:
The Check Engine Light (CEL) codes can be obtained without a trip to the shop or dealer, & without an expensive code reader. The Haynes manual for Mercury Villager/Nissan Quest covers this on page 6-4. To extract the stored codes:
1. Turn the ignition off
2. Unplug the
diagnostic plug nearest the starter solenoid
3. Turn the ignition on but don't start the engine
4. Reference this
diagram to determine which pins to jumper
5. Plug the
jumper wire into the indicated pins in the
plug & socket for exactly 2 seconds, no more, no less, and remove the jumper wire
6. The CEL should start blinking, a series of long flashes followed by a series of short flashes. It will repeat the cycle so don't worry about rushing back to the cockpit to get the codes. When the flash sequence repeats, count the number of blinks for the longer duration flashes, & count the number of blinks for the shorter flashes. This will give you the code, for example 12 long flashes followed by 5 short flashes is fault code "1205" which is the transmission "Line Pressure Solenoid" and/or circuit fault (96 & newer).
Post codes and we'll go from there.