Alkorahil

could be many things. Try checking all of your vaccum lines first to see if they are cracked, frayed on the ends or loose. up and down engine can also be caused by: air filter filthy MAF sensor EGR valve stuck/bad clogged PCV clogged fuel filter engine temp sensor IACV-ACC valve O2 sensors also check the wires and connectors on these parts for loose/corroded where applicable. As to the odometer, does the speedometer work? If it does still work then mot likely you are looking at needing a new cluster meter.

Here is the set up:

Here is the parts diagram. This one is for the Z24. Teh VG30 is nearly similar. Couldnt tell exaclty if you had a 2.4 or 3.0 from the photos. Looked like a 2.4.

650-700 750 i believe is spec

Yes. right next to the wiper motor.

In the US wheels are still done and discussed in inches. If you have an 05 pathy, the wheels should be 16x7 or 17x7.5. There were 5 and 6 spoke versions made by Alcoa and Enkei for Nissan. All the R51 Pathfinders are 6 lug wheels and hubs. The lug pattern is 6 x 5.5. This means there are 6 lugs on the hub and there is a 5.5 inch space in the middle for the spindle.

SECONDED

Your Pathfinder AC system has 3 important sensors designed to shut the AC compressor off if it thinks there is a problem. This is done to protect the compressor and other parts of the AC system. The downside is that if one of these sensors is bad or going out or has a corroded/loose connection, the system thinks there is a fault and the system shuts down. You have a temperature sensor on the compressor, on the top towards the back. If it senses the compressor is too hot or cold it will not let the compressor engage or turn it off. There is a Pressure switch on the liquid tank could be bad, causing the system to shut down when the system has too much or too little freon. There is also the tHermo sensor in the evaporator case that is designed to detact if the evaporator is freezing up.

There alot of parts starting to fail on old vehicles.......

Does it do this when the AC is on or has been on? Does it do this when the AC is not on and hasnt been on?

Dont overfill your transmission. Best to under fill it and then top it off. If you are over let a little out at the drain plug and then get it right at the filler. Transfer fluid is seperated from the transmission fluid. The touque converter is not the transfer case. The torgue concerter holds fluid, so when you drain and refill, you are only replacing about 1/2 to 1/3 of the total amount of fluid the transmission holds. The only drain point for the transmission is the drain hole you used.

I read the other day that they are closing some 400 stores in Texas.

Sounds like you nailed the culprit down.

Funny....on my way home they had one of these up and I thought of your post! So I now know that my speedometer is correct from 40-45 MPH.

based on these quoted points I vote IVAC-ACC Valve and/or regulator.

Yes, they are all model RE4R01A. But like an engine, there are differences, changes and refinements as the years progress. For a nice analogy: an ‘91 WD-21 and a ‘95 WD-21 are both model WD-21. They even look similar on the outside. Get inside and they are very different. Same with the transmissions. There are differences in the inside. Take a look at this screenshot. It shows the part numbers for a R50 transmission and T-case assembly. It shows the 8 part numbers, the application dates by production and so forth. Now, look at choice 3 and 4 and choice 5 and 6. These are completely identical assemblies but have different part numbers. How do I know this? #3 is 31000-4EX75. #4 is almost entirely the same. Just one number higher. This means that there is some part in them that changed manufacturer/supplier for some reason. (reason is quality or price typically) Whenever a part changes, in any way, it gets a new part number from Nissan. So, if some genius engineer decided a screw should be painted blue for model year X, the new blue painted screw gets a new part number and thus the assembly it goes on would change. SO... If I was to try to pick choice 3, I can tell you it will supercede to the next choice. Now, look at choice 1 and choice 7. Two years difference in when they were used. If you look at the part numbers they are much more different. That means inside there are some changes. Now, could you just pick any of these choices and throw them in your R50 and never notice the difference? Probably. Would I recommend it? No, as you never know what other changes they made to the ECU and especially the AT Control Module as well I hope this helps some.

Remanufactured alternator.

Yeah, i think its 750 rpm.

that article cracks me up all the time. I go look at it from time to time because it is always changing.

I dont care for that candy stuff. To each their own I guess.

They will also probably hook your lines up to a drain machine. If they are high tech.

yes please post pics!

The ideas in my head all point to dealer only parts. I can probably beat the price your local dealer will charge. If you order from me it will be less $$ but take a few days to ship it. It is up to you. I am not helping people just to make $$ I am helping people because they have helped me in the past.

There are 8 different Auto Transmissions used on the R50 in its production run. 14 different manual transmissions. R50 with manufacturing dates of 10/95 to 07/01 have a strainer and 2 small filters. However, these are parts that Nissan does not recommend for service if you are using the correct transmission fluid with the correct recommended detergents, etc. Now as to debate on if it can be or should be serviced anyways, esp if you have very high mileage....well thats a different animal. This should explain why your Nissan Dealer gave you the information they did.

OK dials will be a different diagram. Let me get that out.