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Old 10-25-2014, 03:03 PM   #1
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Join Date: Oct 2014
Age: 68
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Default Check Engine Soon light on, Discovery II

Prior to light coming on, with smog check coming due, I added CRC Guaranteed To Pass Emissions Test Formula to a full tank of gas (Chevron). Immediately went on 250 mile roundtrip for the day. No problems. Next day, during errands, car hesitated then recovered from stop sign. Following day, starting trip, car stumbled on incline, then 2miles later Check Engine Soon light came on. The next day, local AAMCO testing results: test code P0300 (Random multiple cylinder excess emissions detected). P038 (Cylinder #8 misfire). P036 (#6 misfire). P035 (#5 misfire). P1300 (rapid multiple cylinder misfire detected). P0301 (Cylinder #1 misfire). Shop didn't know what fix would be. Went to leave, vehicle would not start. Towed home, had a beer, was able to start car and reposition in driveway. Looking for diagnostic direction, suspected problem. Mileage 75K.
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Old 10-25-2014, 09:04 PM   #2
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Location: Liberty Twp, OH
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could be a bad MAF sensor, or the air filter lid is not sealing properly.
This forum is not used much... please go to:


Cincinnati OH
http://www.customroveraccessories.com Home of the New D2 horn buttons!

http://www.usarovers.com/ (call for Rover parts ask for Nathan 502-222-5859)

Rover Radio issues or IPOD Adapters http://home.valornet.com/splacket/index.htm

EAS fault http://www.rswsolutions.com

When working with GEMS vehicles. Never try to locate a misfire by pulling plug leads off - pull the injector connector instead. Otherwise you can blow up the ECU.

Secondly never swap ECUs between vehicles to test them, because both vehicles and ECUs may stop working, and you'll have to have them all reset by a franchised LR dealer (ouch!).
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check engine soon light, discovery ii, random misfires

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