1988 PLYMOUTH RELIANT SHAKES

  • Tiny
  • coltan
  • 1988 Plymouth Reliant

Shakes or Wobbles problem
1988 Plymouth Reliant 6 cyl Two Wheel Drive Automatic

i wanted to know what I could do to make my car stop shakeing

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Thursday, February 4th, 2010 AT 12:15 AM

7 Replies

  • Tiny
  • ch112063
  • Member

Is it shaking when your just idling or when your driving at highway speeds? If it shakes when in Park before you even get it going you may have a miss in one cylinder. Does it ever go away?

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Friday, February 5th, 2010 AT 8:42 PM
  • Tiny
  • Jonah_k
  • Member

It mainly shakes at highway speeds and whenever you let off the gas some times. It was also randomly shake a few times when idling.

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Saturday, February 6th, 2010 AT 3:39 AM
  • Tiny
  • ch112063
  • Member

It might be missing a cylinder under load and high vacuum conditions. If you remove and check the plugs they might be fouled and one may not be firing. A plug wire may be missing its spark under load. If you let it sit and idle start by pulling one plug wire at a time to see if it idles worse, the one that doesn't make much difference is the weak cylinder. If your lucky that could be the problem.
An 88 has readable fault codes from the computer. If you turn the key on, off, on, off, on again all within 5 seconds you'll see the "check engine" light on your dash flashing. Count those flashes and post what code you see.
It will end with 5 flashes and 5 flashes(55). That will help also. After that let me know. You may need to do a compression test also if you get no codes. The distributor cap, rotor, and distributor pick-up all have problems depending on their age.
Checking the plugs(Champion RN12YC's) show if it's running rich, lean, or just needs replacing. Hope this helps you with your great car. Ok

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Sunday, February 7th, 2010 AT 12:15 AM
  • Tiny
  • Jonah_k
  • Member

Ok thanks I will try that. But I just changed the plugs a few weeks ago and the wires looked good besides one that was a little rusty and the tip of the plug was really rusted. But I will try what you said and let you know what happens.

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Sunday, February 7th, 2010 AT 5:02 PM
  • Tiny
  • ch112063
  • Member

OK Jonah, good luck and be careful, its a great car.

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Sunday, February 7th, 2010 AT 8:59 PM
  • Tiny
  • Jonah_k
  • Member

Alright well its shaking really bad now and blowing out black smoke, I got the car as a gift from a friend and I guess its been doin this to him ever since he had it. But I replaced the spark plug wires and I pulled one wire out at a time when the car was running and each one made the same noise and made the car run a little wierd. So what should I try next?

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Wednesday, February 10th, 2010 AT 12:17 PM
  • Tiny
  • ch112063
  • Member

Take out the plugs they are probably all black from too much fuel, it sounds like its running too rich, and the black smoke proves its fouling plugs. After the fuel ruins the spark plugs they foul out and cause a rough idle and a shaking type of feel.
Before you remove the spark plugs do this. Turn the key to on, then off, on, off, then on and leave it on, watch the 'check engine' light. It will start to flash on and off, count the flashes. The diagnostic mode ends with 5 flashes and another 5 flashes. Code 55. Ok? I am looking for a code 11, or 13, or 22, or 51, or 52.
Let me know what codes you get, this diagnostic mode must be done within 5 seconds. As many times as you want.
I'm thinking the o2 sensor or coolant temp sensor may be bad. These would cause an overly rich condition so before we spend any money on plugs lets make sure of why its running so rich and with a high mileage car(and a good car also) many things could be wriong. Ok?
This is a 2.2L engine? 4 cylinder? We will try this now ok?

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Monday, February 15th, 2010 AT 9:21 PM

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