Jump to content

88 mj backfires at WOT


Recommended Posts

O2 sensor could cause this too if its bad. My 2.5 would act like that sometimes while accelerating. I tried several things with the fuel system hoping to get it to go away, finally put a new O2 sensor in it just because, and as soon as I took it out on the street, it smoothed out and has been running great ever since. But like the other posters said, check the EGR valve for proper operation and closing ( it would cause a vacuum leak if it didnt close all the way), Vacuum lines, fuel pressure, fuel filter, check that the intake manifold bolts are tight... My 258 I had in My Grand Wagoneer would do this, tightening them regularly would keep things working properly. But I don't think the 4.0's had much of a problem with this. Good luck!

Link to comment
Share on other sites

  • 3 weeks later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...