Question about 2000 Jeep Cherokee

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Terrible miss and loss of power at high speeds after driving for 15 minutes orr so. found to have a error code p301 306, misfire codes, replaced plugs and coil rail. driving action continued and same codes came up. tested fuel pump found it to be weak and shakey so I replaced. ran great, codes returned and repeat of driving action. found an answer (at a differ site) that carbon build up in injectors would send misfire code. replaced injectors. codes came back any idea. Thanks Ralph

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  • lnk5 Oct 07, 2010



    Thanks for your response beforehand



    The car has 160000 + miles, my daughter will be driving the car so I am covering all bases. when the misfire code P 301-306, I diagnosed the problem from least expensive and most likely up to the fuel injectors. I changed parts in order: spark plugs, coil rail. tested compresion 148 psi or better. tested fuel pump found when the lose of power occurs there was a drop in presseure to 40 in additon to that the needle danced back and forth like crazy. so I change the pump (seemed reasonable). after the injectors i am completely dumbfounded. there may be a computer issue or sensor that my backyard mechanic learning has exceded my knowledge, Please excuse the delay i did not know to go to the account created for me.



    Ralph

  • lnk5 Oct 08, 2010

    Terrible miss and loss of power at high speeds,, 45-65mph, after driving for 15 minutes or so. This does not occur at idle. Check engine lite is on, found to have a error code p301 306, misfire codes. The car has 160000 + miles,. with the misfire code P 301-306, I diagnosed the problem from least expensive and most likely up to the fuel injectors. I changed parts in order: spark plugs, SAME PROBLEM coil rail.SAME PROBLEM. Tested compresion 150 psi or better reading, according to chart range is 150-185 adding oil to cylinders increased reading. Tested fuel pump, found when the lose of power occurs there was a drop in pressure to 40 in additon to that the needle danced back and forth like crazy. so I change the pump (seemed reasonable).SAME PROBLEM. after that I found at a similar website that carbon depostits in the injectors would cause the code reading and lose of power. so I changed the injectors SAME PROBLEM! I am completely dumbfounded. there may be a computer issue or sensor that my backyard mechanic skills are unable to diagnose. what do you think.

  • lnk5 Oct 08, 2010

    Thank you will double check all connections later today hope you are right

    Ralph

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  • Jeep Master
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The dancing needle is caused by a bad contact at the battery clamps - the battery is left out and the voltage at the alternator varies wildly.
That voltage variation is definitely capable of causing all the other problems so clean the clamps thoroughly with wire wool and get a new battery.
If even this doesn't fix it then the only thing left is a bad contact in the wiring to and from the ECM. So check them all, including the wires to the sensors.

Posted on Oct 08, 2010

  • Azrael SRL Oct 08, 2010

    Let's hope so, otherwise the only thing left is the ECM itself, and that will be expensive to replace.

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  • Jeep Master
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Are you thinkng about the coil packs? were covered under the extended warranty to 120,000 miles. If your DTC is throwing those codes the dealer should have replaced them free of cost. Had the same problem and they replaced mine free.

Test it and tell us news.

Posted on Oct 06, 2010

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