tranny/engine ?? jerks occasionally

[johnniebro]

My new 2004 Explorer XLT seems to jerk occasionally when accelerating up a slight hill around 47-49 mph.

I took it in not long after I got because I did not think it was changing gears properly. They said it was.

The fist time I noticed the jerking problem was on a rainy day. The roads were wet but not flooded, I was accerating normally. It was jerking so bad the wife said something was wrong.

Now it is more noticeable when accelerating up a hill at around 47-49 mph.

Someone said it may the ABS system. Did not want to take it dealership without some history of this problem.

Figured they would just snowball me.

 

[Glacier991]

It is often very difficult to distinguish transmission problems versus engine problems in the situation you describe. I'm not sure we can help you here....

 

[squd92expsp]

Do you know what rpm's it's at at that speed? It sounds to me like the spark plugs are bad or improperly gapped, just kinda suprised that they would be on a new vehicle. That's probably a good/easy place to start, it fixed my X when it was doing what you described.

 

[unclemeat]

I like the spark plug thing. I just got a 2004 Ranger, a week old, and noticed a miss or jerk when I would open the throttle. Turned out I had a bad wire and foulded plug. I eventually got a check engine light. If you pull the plugs and examine them they will show you if there is a problem with engine combustion.

 

[STANN]

Mine (96 4.0) was doing that as well, around 2k rpm. Changed the plugs and wires. Problem solved.