What would cause a 2000 Ford Explorer XLT 4.0 V6 to miss and be slow on hills?

Asked by Oct 06, 2013 at 03:59 PM about the 2000 Ford Explorer XLT 4WD

Question type: Maintenance & Repair

I have just replaced my fuel pump and sending unit plus new plugs and wires came up
trouble codes engine misfire cylinders 3 and 6 replaced the coil pack engine light went
off but still has a miss with a slow takeoff and loses power on hills My explorer just
tripped over 149,000 One person that I spoke with thinks the catalytic convertor is
stopped up but I think I am hearing an exhaust leak between the manifold and the
convertor It also cuts off when I turn the steering wheel sharp

12 Answers

Tom Demyan

If you had a misfire and didn't take care of the problem right away and drove long distances, you possibly clogged up the catalytic converters. Unburnt fuel will clog them. If you suspect an exhaust leak, have that looked at and at the same time have the mechanic perform a clogged cat test.

6 out of 6 people think this is helpful.
Tom Demyan

The engine cuts off when you turn the steering wheel hard to one side? That might be a power steering pump issue.

4 out of 4 people think this is helpful.

Tom its actually cuts off turning sharply left or right Since I posted my question My engine whistles when I rev it What could be causing that? Would a clogged catalytic converter also cause the whistling sound?

2 out of 2 people think this is helpful.
Tom Demyan

The whistling could be a bearing from one of your accessories driven off the serpentine belt and or the tensioner pulley. Have someone rev the engine for you while you get under the hood to pinpoint the area of the noise.

1 out of 1 people think this is helpful.
Best Answer

On my misfire issue Tom I replaced the coil pack again because the old one was still under warranty the engine light hasn't came back on In park the engine will rev up good Is there any other diagnosis you could give me also on the miss? Could be wrong though could the loss of power on hills and takeoff also come from the miss Back in the early 2000's I had a 1986 S10 Blazer 4x4 with a 2.8 V6 with 200,000 miles at the time the catalytic convertor was totally stopped up but it ran on all cylinders but yes very,very slow on hills at times drop from 65 down to 25 at the top in passing gear Don't know if it was mentioned before but it has an exhaust leak somewhere from the manifold on the passenger side to the first converterWould the exhaust leak also cause a bad miss?

1 out of 1 people think this is helpful.
Tom Demyan

An exhaust leak won't cause a miss, but the truck won't run properly, and you will have some hesitation. Fix the leak, and see how well it runs. Go back up to my first post and read it again.

1 out of 1 people think this is helpful.

Tom, Now my Explorer is showing trouble codes Engine too lean Banks 1 & 2 I do feel the catalytic converter has alot to do with it but is there any new things it could be too because it has a new fuel pump/strainer/sending unit and new plugs wires and a new coil pack Would an exhaust leak cause it to run too lean?

3 out of 3 people think this is helpful.
Frida Begga

Johnny so what was the outcome of this? I am having the same thing happen on my 2003 explorer just hit 144,000 the 1st thing to happen was the abs. Or overdrive orange light blinks the one u use for slowing down going down hills after that about two weeks later my car stalled making a sharp left. Three weeks later now I am having troubles when driving it's all really sluggish almost like it's slipping and you have to play with the gas pedal to keep it moving I was starting to think it was maybe the transmission but sounds like you had the same thing happen so what was the outcome also the cost to fix it. Thanks

1 out of 1 people think this is helpful.
Johnny Martin

Mine ended up being the fuel pump/sending unit giving out but the fuel mixture ran lean for so long both catalytic convertors became stopped up thus having to replace them Maybe the way your problem sounds you may need a new fuel filter and fuel system cleaner If your engine light is on go to your nearest parts store and they should have a hand held computer that should tell whats going on free of charge The only other thing I can tell you is take it to a Ford dealership where they have a diagnostic machine to hook it to but they have very expensive labor rates I bought my own OBD2 handheld that tells trouble codes but they cost over $200.00 for a good one I sometimes just unhook both battery terminals for a few minutes to reset the computer but 9 times out of 10 the light turns back on Hope this helps Frida!

2 out of 2 people think this is helpful.
Frida Begga

So the slipping and sluggish take off had nothing to do with the transmission? Did you do the work yourself or take it to a shop. I have a guy that is pretty fair price but this sounds like it still could be expensive I am dropping it off on Monday still going to try and drive it in.

Frida Begga

It's my o/d. Light that blinks I found another format where they where saying it was the transmission when the o, d light flashes and is taking off sluggish. But your sounded just like mine I had that car stall when I did the sharp left had to stop and restart it. I was thinking it was electrical. I still think whatever it is will cost some money


Cutting off, when turning hard one way or the other, is usually a bad power steering pressure switch on the power steering pressure hose. Changing this out will cure the stalling on turn problems. You have done the logical thing with your tune up, with one major exception. You didn't do a compression test. It is quite possible you have a cylinder down, causing the misfire. The only true way to do a tune up, on a high mileage vehicle, is to perform a compression test. You will find any misfires that are engine related, to wear or carbon or etc. If it a low cylinder, there is a chance of carbon build up on the valves. You can sometimes clear that problem with a good upper valve lubricant/cleaner, or sometime with water. Being it's fuel injected, the water idea is pretty much moot, but the cleaners can help. Also, the 4.0 throttle body can get gummed up inside, and can use a good behind the butterfly cleaning. There are two small air holes inside the butterfly that supply air to the engine for idle. They get black from the dirty air and fill in the holes. A good can of Berryman's B12 will cure that. I'm a retired Ford partsman/line mechanic. These are common items to check on the 4.0 engine. The S197 Mustang with the 4.0 has the same problems, but are easily cured with a good cleaning, if it isn't an internal engine problem. Hope this help you some.

2 out of 2 people think this is helpful.

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