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rpmdiag
rpmdiag, Tech and Instructor
Category: Ford
Satisfied Customers: 7612
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: 10 months ago.
Category: Ford
Expert:  rpmdiag replied 10 months ago.

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

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 10 months ago.

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