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  • cmshane39
  • 1989 Dodge Ramcharger

Engine Performance problem
1989 Dodge Ramcharger V8 Four Wheel Drive Automatic 300000 miles

I would like to know how to check for codes on my 89 ramcharger 318 4x4? This this went from 16 mpg to 7mpg almost overnight. I don't know exactly where to start. Please advise. Thanks

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Friday, February 26th, 2010 AT 3:50 PM

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  • Tiny
  • caradiodoc
  • Expert
  • 25,768 posts

Do not crank the engine, but cycle the ignition switch from "off" to "run" three times within 5 seconds, then sit back and count the flashes of the Check Engine light. You're looking for two-digit codes. One flash, a short pause, then two flashes is code 12, followed by a longer pause that will be the start of the next pair of digits. Code 12 just means the ignition switch was turned off. Not all vehicles bother to display it. Code 55 just means end of message. If you want to double-check or if you missed a code, cycle the ignition switch off and back to "run" once and the sequence will start over. Some will repeat the sequence over and over until you turn the ignition switch off or start the engine.

The codes will indicate the circuit or system with the problem, not the specific part.

You might also check for a sticking front brake caliper as the cause of low fuel mileage.


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Friday, February 26th, 2010 AT 5:24 PM

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