Check coil pack for resistance with an ohmmeter. if one pack controls two cylinders, the values should b the same. if not replace coil pack
SOURCE: 2001 Plymouth neon needs tensioner assembly
Most tensioners have a bolt on the other side of the twnsion pulley, if not you have to replace the tensioner with the base.
SOURCE: random misfire/rough idle/stall
Low fuel pressure due to faulty fuel pump will give misfire codes due to fuel starving conditions. Have fuel pressure tested, preferably when running bad.
SOURCE: 2000 neon check engine light is on
P1685 Skim Invalid Key.
The Sentry Key Immobilizer Module contains a Radio Frequency (RF) transceiver and a microprocessor. The SKIM transmits RF signals to, and receives RF signals from the Sentry Key transponder through a tuned antenna ring integral to the SKIM housing. When the ignition switch is turned to the On position, the SKIM transmits an RF signal to the transponder in the ignition key. The SKIM then waits for an RF signal response from the transponder. If the response received identifies the key as valid, the SKIM sends a valid key message to the PCM over the PCI data bus. If the response received identifies the key as invalid, or if no response is received from the key transponder, the SKIM sends an invalid key message to the PCM. The PCM will enable or disable engine operation based upon the status of the SKIM messages.
you can look it up here:
http://www.engine-light-help.com/check-engine-light-domestic.html
SOURCE: My 1998 Plymouth Neon sohc has a 1, 3, 4 cylinder
have you changed the fuel filter? Have you changed the ari filter?
SOURCE: 1999 plynouth grand voyager was coding egr replace
just because the check engine light is back on, it doesn't necessarily mean it is for the same problem. it could be, but would need to pull codes again to find out what its for. literally hundreds of different codes could turn on check engine light. also, was original code for "insufficient egr flow" or "excessive egr flow"? it makes a difference.
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