Transmission is slipping?

sounds like a a trans problem on the way. i would scan for trans codes these guides can help us fix it.

https://www.2carpros.com/articles/automatic-transmission-problems

and

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down these guides and report back.

No Codes and fluid perfect

the pcm should have fault codes in the history the only thing you can try is a new throttleposition sensor this someties causes erattic shifting and slippage

The Throttle position sensor gets regular voltage. Could it be a valve body problem or a pressure issue? There are no codes whatsoever. It has never had a transmission problem till now.

the throttle position sensor actually is a poteniometer that gets varied voltage from 0-5 volts depending on the position of the throttle. This could be a valve body issue but generally this will not cause slippage.slippage is caused by a clutch assy releasing and grabbing again.if the fluid is clean and no codes then the only alternative is internal failure .This is most likely just the onset of this problem it will get worse.

You can service the filter and fluid and make sure you have the proper type of fluid. You can also go to your ford dealer and buy a bottle of friction modifier and add this to your transmission worth a shot i have seen it work.

Ok, a better explanation would be that my ford explorer when it accelerates and revs up. It revs up like someone just popped into neutral. Like I said it does not do it every time.

Yes i understand your explanation and it is something inside the trans rather it is a band or a clutch plate there is no way to know without dissassembly. I would give the friction modifier a shot .or take to trans shop for diagnostics good luck with it

Thank you very much! My last question is why did it not do it in the winter but when it is warmer outside and you drive it a long time why does it do it then?

good question. it has to be a problem that only shows up when the trans gets very hot.did it do this last summer or is this the first time?

It did it last summer but at the time it had an intake manifold leak and we thought that was the problem and we fixed it when it got cold. It shut off the check engine light. It has no engine issues. I feel really upset that my engine is nearly in perfect shape and im about to have a transmission fail.

well the good news is it could do this for a long time before the trans fails it will progressively get worse.but you need to service it even though you have clean fluid you may still have restrictions in your filter.explorer is well known for trans problems so you have been lucky so far.But it is what it is.good luck

is it possible it could be the torque converter if it is a pressure issue.

yes it is possible

what about valve body gasket?

this is a possibility but should have code for internal pressure loss. just grasping straws without codes

What could it be if there are no codes at all?

well no codes has to be internal mechanical problem.possibly clutch disc slipping or even a badn or servo just really hard to accurately diagnose.i would try the friction modifier from ford dealer.

Transmission problem
1999 Ford Explorer Engine Size unknown Four Wheel Drive Automatic 120000 miles
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Ok, with the transmission slippage, at random times whenever i start the vehicle and put the gear to reverse, the transmission keeps on spinning but makes a loud noise. the fluid was just recently replace about 3 weeks ago, but it was still doing making the noise sound when i first bought it. sometimes i would try and go to reverse fro like 10mins but the transmission would make that noise. what would be the problem? and what would the price range be?

On some of the late model explorer and ranger models, they had an issue with seperator plate gaskets on the valve body. At one point you could get a kit that replaced the seperator plate and gasket as well as an updated valve for the valve body. the noise you hear is the pressure release coming from the tear in the gasket. If I had to take a stab at it, That would be my guess.

I have had the transmission serviced recently, my mechanic tells me it is in good condition. However I do have the weirdest problem with it, one that my mechanic still does not have the answer for.

When I turn on my air conditioner in the summer, after awhile of running it, hit a light and it will cause the truck to hesitate, almost like the transmission won't go into gear, and when it does, it is a hard shift out of first. Then I come to a stop again, and it sounds like the transmission hesitates to go back down to first gear. I can turn the truck off, not run the air conditioner, and it will never once do it again. It will shift fine, take off fine, as long as I don't run the darn ac.


Does not do this with the heater on in the winter.

I have had a check engine light on for months, a problem I know to be the O2 sensors, but no one can tell me which one, and costs to much to replace them all.

Also my airbag light flashes on when this happens.

Thank you.

The only thing I can say is there is more of a load on the engine when the AC is on. That may make the problem seem worse. As far as the transmission, if an O2 sensor is causing the engine to run too rich or lean, you may actually feel a harder shift just because it isn't running as smoothly as possible.

NOTE: Based on the trouble code they got, they should be able to identify which O2 sensor is the problem.

Perhaps I need to take it to someone who has a better code reader. Thanks for your help.

Is there any way you can get the code number that was retrieved?

My explorer will sometimes mostly after being drove for a good period of time slip into neutral when taking off from start. There are no codes or problems with the fluid. Do I need a transmission rebuild? Like I said it does not do it all the time. Is it worth rebuilding, my engine has 210000 miles on it or should I get another vehicle?

It sounds like there may be a problem with the pressure in the trans. As far as rebuild, that is all based on the condition of the vehicle and how well taken care it is. Think about it. If it costs 2K to fix the trans and the vehicle is in good shape, fix it. Think about what you would get for 2K.

Could a torque converter cause this problem?

Yes. Also, the front pump and a few other things.

so i should do a pressure test for sure?

I would suggest it.

We have a couple of issues with our 1999 Ford Explorer sport. First, if the engine has run for a while, usually after doing errands I have a possible transmission slippage problem right as you take off. We have no other indication of transmission problems other that this instance. If you go very slow for a little bit and keep lightly stepping on the gas you can get it to shift normally. The second problem is when you get going at about 35 mph there is an extremely irritating loud noise and echo in the vehicle. This has been a great vehicle and we are financially strapped right now and cannot afford a new vehicle but I don't know how much longer I will be able to drive it! Thank you for any information.

Have you had the trans serviced reciently?

We had the trans serviced about a year and a half ago, but probably only 10K miles or so. The truck used to be my husbands primary business vehicle but has become my run around town vehicle so it gets driven very little.

Hi:
If the trans is full, and it is slipping, chances are it need rebuilt. It sounds like the clutches are bad. Have that confirmed at a trans shop. Let me know what they tell you.

Hey, my explorer will rev up between 1st and 2nd gears and not accelerate. After it revs up it will accelerate just fine. When I stop, something will unstick underneath the floorboard. I could really use help on this, this has been going on for months and I cannot find the issue. There are no codes at all. The transmission fluid is perfect. It will not lag all the time. It can drive for two to three days and not do it. It does like to do it more often with the AC running. Earlier I was terrified, because when taking off from a stoplight, it would not go(the whole suv shook while it wouldnt go.) and then all of a sudden it jumped. Im so glad a car was not in front of me. Any ideas? I was told I could have a bad MAF but how can it be a sensor if my check engine light is off?
Also could it actually be a bad Valve Body Gasket? Thats what I think it is?

try cleaning the throttleplate with choke cleaner on both sides as well as the iac hole. it may be sticking.if that doesn't cure it then take to a trans guy so he can scan for codes as alot of times those don't show on the auto part scanners.

If the problem is electrical, there would usually have trouble codes and since none is present, it would be mechanical or hydraulically related.

Slipping can be due pressure leaks in the system.

It could be a failing seal, which explains the intermittent condition.

You would need to perform pressure test to check if anything is wrong.

Went there and there were no transmission codes.

check your fuel pressure as well and check for a vacuum leak. also check the hoses going to the valve covers for holes.

I do for a fact have a bad fuel pressure regulator for sure which causes it to kinda rough start sometimes. There are no vacuum leaks and all hoses good.

then fix the regulator first if you know it's bad.

For my model its replacing the fuel pump, but how would that cause the transmission to slip?