Help engine boggs

[Stacy504]

Joined the board mostly for some advice.
Am pretty good with cars and have done some rebuilds and import mods but am unfamiliar with the explorer. I've got a 98 XLT and if I floor it the acceleration sucks big time, if I ease on to it it is a lot better what is the deal and how do I fix it. I need these things fixed before I go the diablo chip and mod route please help.

 

[oahrens]

G'Day and Welcome

Welcome to the board...you'll find this to be an active response board, but can you post more details about the symptoms and any specs/mods that might contribute to this?
=note= Can't wait to visit down under someday

 

[Stacy504]

No mods as of yet.
The problem does not affect daily driving it is only a problem when I floor it, the acceleration is much better if I just ease on to the gas to full throttle. If I floor it it takes off slower than if I ease to full throttle.
Could it be my Cat's or aybe a collapsing fuel line, again not too familiar with this truck.
Oh yeah Sydney is pretty cool.

 

[TwoToneX]

I had this problem with my Dad's '96, it seemed to start to do it when the tranny started going out. I stopped driving it a little while after that so I never knew if a new tranny fixed the problem...

 

[oahrens]

Assuming that you've kept up with 'regular' maintenance, (ie: tune up, fluid and filter changes), you have reached the next level of do-it-yourself fixes.
You can rule out the trans if the motor bogs in neutral.
It sounds more like a dirty/clogged fuel/exhaust part.
I don't know the specifics of the '98 so check the board for applicability.
-Clean MAF
-check the Fuel pressure Regulator
-Fuel Pump?
-It sounds like clogged cats to me and there is no way of testing them.
:smoke:

 

[Stacy504]

oahrens
Thanks man that's what I thought with the cats, and I know you can't test em, will try the other hings too. Haven't tried it in neutral yet I'll give that a try, but I've had tranny probs in the past and this doesn't feel like one. Thanks for the input man.
Also the engine in my x is the 4 liter when looking for bolt ons what year is this eg 94-2000, just so I know what fits.

 

[adamsbro2]

Hey, I hope you all get this. I have a 91 XLT. I had a similar problem. Thank goodness i work for a mazda dealer so i hooked it up to the computer and put the TPS on the scope and noticed that my TPS was bad. When i pushed on the gas the comp couldn't tell where the throttle was. I replaced the TPS, A 40 dollar part and it fixed it perfect. seeing its cheaper than cats i would suggest trying that to be safe.