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rpmdiag, Tech and Instructor
Category: Ford
Satisfied Customers: 6724
Experience:  Since 1975
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Misfire on 4 and 6 and it bucks a little while idling also

Customer Question

misfire on 4 and 6 and it bucks a little while idling also when it hits 60mph the rpm drops and the buck is there again
JA: How many miles are on the car? Is it a steady misfire? Or random?
Customer: steady 130,000
JA: What is the model/year of your Ford?
Customer: 2002 ford escape 3.0L
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: checked coils, plugs changes injectors in 4 and 6..Yes would like to do it myself
JA: Anything else you think the mechanic should know?
Customer: had to replace entire exhaust because my catalyc jammed up
Submitted: 2 months ago.
Category: Ford
Expert:  rpmdiag replied 2 months ago.

Hi, welcome to Just Answer. I’m Ron and I’ll be helping you

With this steady misfire, your check engine light should be on and setting codes. First I would like to know what they are and then check for plugs, wires injectors or vacuum leaks including a partially stuck open EGR valve. Compression test would also be in order if all the other s check okay. keep me posted please.

Thanks, Ron

Expert:  rpmdiag replied 2 months ago.

Hi, I'm just following up with you to see if you have any more questions.
Thanks, Ron

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