2002 Explorer bucking problem

Tiny
NASMEYER
  • MEMBER
  • 2002 FORD EXPLORER
I own a 2002 Ford Explorer 4WD with a 4.0 V6 and 80k miles. Recently I have noticed an intermittent problem when the engine is at a low RPM usually in OD between 40 and 55 MPH the engine will buck or mis fire a couple of times when driving a steady speed or accelerating slightly, it will become less noticable after I press the gas and drive the RPM's up as it downshifts and accelerates, this is not a constant bucking but will do it 1 to 5 times while in this RPM range. I have changed the air filter every 20k miles, just had the throttle body and injectors cleaned, I also cleaned the MAF sensor. I have not noticed any type of vacuum leak. No engine light has come on while I have had this problem. It has a very slight (barely noticable) but also intermittent mis during idle, but when I raise the RPM's at idle it runs smooth. At $100+ I am hesitant to replace the MAF sensor without being quite sure it is at fault.
Do you
have the same problem?
Yes
No
Friday, April 6th, 2007 AT 10:33 PM

5 Replies

Tiny
JON BOY
  • MEMBER
It sounds like the motor is missing when its loaded at low rpm's and not when your running it harder or taking off fast?

If that's what its doing, I would look at the ignition system. It sounds like its not getting a strong enough spark. If its missing enough, it should set a flag on the computer. Is the check engine light on?
Was this
answer
helpful?
Yes
No
-1
Monday, April 9th, 2007 AT 1:09 PM
Tiny
NASMEYER
  • MEMBER
No light has come on at all while I have had this problem, if I accelerate real hard it will still have the miss at higher rpm's but is most noticable at low RPM's under heavy load.
Was this
answer
helpful?
Yes
No
+1
Monday, April 9th, 2007 AT 2:37 PM
Tiny
PMYHAL
  • MEMBER
I have same problem with Gand marquis did you fix it.
Was this
answer
helpful?
Yes
No
Tuesday, April 10th, 2007 AT 11:10 AM
Tiny
NASMEYER
  • MEMBER
Turned out to be plugs and plug wires, hope this helps with your marquis.
Was this
answer
helpful?
Yes
No
Tuesday, April 17th, 2007 AT 5:17 AM
Tiny
MERLIN2021
  • EXPERT
The problem could be the EGR solinoid opening the egr at the wrong time. It's a small canister with 2 vacuum lines and 2 wires. Also if you can take the egr off and clean out the carbon in the passageway, use a coathanger and push it all the way to the throttle!
Was this
answer
helpful?
Yes
No
Tuesday, April 17th, 2007 AT 8:57 AM

Please login or register to post a reply.

Recommended Guides