How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask cwalkerjr21 Your Own Question
cwalkerjr21, Mechanic
Category: Jeep
Satisfied Customers: 711
Experience:  Shop training and hands on experience.
Type Your Jeep Question Here...
cwalkerjr21 is online now
A new question is answered every 9 seconds

I have a 2001 grand Cherokee limited 4.7 was running great

Customer Question

I have a 2001 grand Cherokee limited 4.7 was running great then I shut it off started it about 15 mins later and was misfiring. Threw a p202 and multiple misfires on cyl 1+2
JA: How many miles are on the car? Is it a steady misfire? Or random?
Customer: It's got 170 k on it. It it skipping bad. It says random misfire on my code reader. P300 p301 p302 p202
JA: Are you hoping to fix this yourself?
Customer: Yes I work on cars frequently
JA: Great! What have you tried so far?
Customer: Changed all the plugs yesterday morning. Was going to change the cylinder 2 injector today when the part store opens
JA: Is there anything else important you think the Jeep Mechanic should know about your Jeep?
Customer: No that's it.
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Jeep Mechanic about your situation and then connect you two.
Submitted: 1 year ago.
Category: Jeep
Expert:  cwalkerjr21 replied 1 year ago.

There are a few different things here that could be the issue ranging from shorted injectors, sensor or even the PCM. Lets begin by monitorign the voltage on the Throttle Position Sensor when it is acting up. At closed throttle it should read 0.5-0.7 volt. If it goes high on the scan tool, monitor the voltage at the TPS. It should read the same as the scan tool. If it reads lower at the TPS, check the input from the cruise control switch at pin 32 of the C3 connector, it should never read over 5 volt. If it does, disconnect the clockspring and see if it comes down. If it does, the clockspring is shorted. his Powertrain Control Module (PCM) may set injector codes if the TPS is erratic. If the cruise control switch circuit gets shorted to B+, the PCM will not interpret the correct voltage for the TPS.