Oxygen Sensor Replacement (Post #587) 9/16/2019


I’ve had some issues with the idling on the Big White Bus. Once she is warmed up when I come to a stop sign the idle drops to something like 300 rpms. And eventually she drops lower and finally dies.

I read online that the O2 sensors could be the culprit. I couldn’t remember the last time replaced the O2 sensors. I am not getting Code 43 or 44. As I am not driving her daily I don’t have a good idea what the gas mileage had dropped to. So I decided I’d spend the money and replace. Continue reading “Oxygen Sensor Replacement (Post #587) 9/16/2019”

She Was Rough (Post #559) 5/31/2016

I got word from JagGuy that LKQ OKC had a Classic on the lot. She was a 1993 as well. So I made my way down and was quite pleased with the site. The staff were friendly and efficient.

The check out process was fun. They struggled with the discount when it was time to check out. There was a Memorial Weekend discount and they wanted to give me a military discount too but the computer system wouldn’t allow it.

I was happy with the price 50$(US). The haul was not as significant as usual. I was able to pick:

  • Interior wood trim pieces
  • Plastic trim vents
  • Trailer light wiring kit
  • A door handle from each side
  • Mass Air Flow Sensor
  • Both Belt Pullies
  • And an oil sensor I’ve never seen in working condition

The Classic was well picked over. The ECUs were all gone. Two of the four door handles were broken or missing. The center console was trashed. The seats were well worn.

This classic had 212,000+ miles on her. She had fought the good fight. She was well used. Some one had tried to keep her on the road,  she had new belts. But her days of ferrying people are over.

In a world where these Classics get harder and harder to find its sad to see one go,  but when one keeps others on the road the sacrifice is just.

Thanks for reading and Happy Rovering.

Oil Pressure Switch (Post #472) 3/21/2014

I found a loose wire and was not sure where it went. It had an odd funnel shaped plastic bit attached. After a bit of looking I found the sensor it went to. It was the oil pressure switch.

Looking down on the passenger side
Looking down on the passenger side

I was not sure if oil would come out when I removed it. It didn’t. I wrenched off the old and put on the new. You can see the comparison in the picture below.

Side by side comparison
Side by side comparison

The switch is basically a membrane that flexes and makes contact. I have not had any lights since it was broken and I don’t expect anything to change with a new one installed.

With 205,000 miles on the Range Rover you don’t want to take any chances.

This job was a one on the Difficulty Scale. I chose NOT to have a 6 year old help even though my grand children were at the house. Wrench off the old wrench on the new. Plug in a wire. Easy peasy.

Thanks for reading and Happy Rovering.

Oxygen Sensor Replacement (Post #468) 3/18/2014

Its been a while since I installed new oxygen sensors. By my reckoning I installed them about five years ago. I didn’t take a mileage reading then but I can guess it was at least 25,000 miles ago. Oxygen sensors have a life cycle of about 25,000 to 50,000 miles.

New Oxygen Sensor

If you notice your gas mileage drop by at least 2 mpg you can guess it is your oxygen sensors. They don’t always fail and give you a code 43 or 44. Its part of your regular maintenance like plugs and wires. Continue reading “Oxygen Sensor Replacement (Post #468) 3/18/2014”

Broken Bits (Post #431) 1/6/2014

During my recent repairs of radiator cooling fans and power steering hoses I came across a couple of broken bits. While discussing the electric cooling fan project with the Evil German Dude we noticed the belt that drives the air conditioning compressor was very loose. So while I was under the bonnet for the hoses I thought I’d just sort that out. I didn’t have the replacement hose and it was New Year’s Day so there was no way to get the hose.

I got the pulley in place and began tightening the bolt on the belt tensioner. It never got tight. At some point I decided something was not right at all. At first I figured the bolt was stripped. That has been my experience in the past so my brain naturally went to that first.

I removed the bolt and the bracket and found…
it was broken. Wow. That is disappointing. As you can see in the picture above there are two of these on a Range Rover Classic 1987-1994. The 1995 model has a spring driven unit. This spring driven unit is common to most “modern” cars. This friction method is serious old school. I didn’t say better, I said old school.

I knew finding this part was going to be a nightmare. I immediately called Paul Grant. He is a master of parts and he told me he thought he had one in inventory. I ordered it. It should be sitting in my mail box when I get home today. According to Paul, these are threaded on opposite sides so the one that works for the AC belt will not work for the water pump belt. I’m guessing this is going to added to the list of parts I pull from Range Rovers I find in the breaker’s yards. If you are looking for parts I highly recommend Paul. Stop by his eBay Store and buy something.

The second wasn’t really visible until I had the belts out of the way. Some how the Oil Pressure Switch lost its spade connector. I had noticed a couple of wires loose but was unsure where they went. The spade end doesn’t look like any thing I’ve ever seen before.

The oil pressure switch is found on the side of the engine right where the oil filter is screwed on. I know I’ve changed my oil at least once recently and I should have noticed this but didn’t.

I did find an interesting thing when researching parts sites. Rover’s North lists this part with a really great diagram of it’s identification and location. It also lists for 54.95$(US). However on the Atlantic British site it lists for 7.95$(US). On the Rovers North site similar ones for Discovery II’s also list for 8.95$(US).

I find that a helluva difference in price. I’m almost afraid to ask why. I think I’ll order the 7.95$(US) one from Atlantic British. I’m running out of funds for this round of repairs and I still need to purchase some oxygen sensors.

In my quest for improving the gas mileage by swapping to electric fans I will need to only change one variable at a time. There are potentially four things I believe I can do to improve gas mileage:

  • Remove roof rack (this one is obvious)
  • Replace oxygen sensors (when they begin to fail you will notice fuel use go up)
  • Replace my mechanical fan to electric fans (increased torque and horsepower)
  • Reinstall the air dam (another obvious one)

For the sake of the scientific process I think I’ll change only one variable at a time. I can run a couple of tanks of fuel and get a few MPG readings. I’ll report them all back as soon as I get the data.

Thanks for reading,
You are driving a brick what do you expect your gas mileage to be?
and Happy Rovering.