I have a '95 volvo 850 glt non turbo with 160,000 miles.

I saw an ancient thread about an odometer running too fast and I'm hoping that someone can help me with the same problem. I recently replaced the oil separator and the hoses associated with it as well as cleaned the EGR valve. I had to remove the intake manifold and spent several hours doing it. I can only assume that something happened when I cleared my codes and then disconnected the battery for some time.

I realized that the person that originally posted the thread mentioned 1.5 times the mileage. I had 530 "miles" to the last tank. Not possible. 530/1.6 is 330. 330 is about the amount of miles that I normally get from about a 15gallon tank. Did I change this somehow? I don't have the optional trip computer.

I also have a ridiculous amount of blow by. It is smoking out of the dipstick, filler cap and recently the pressure blew my valve cover gasket. I believe this car is on it's last leg. Any info is appreciated.

 

There is a chance that you installed the WRONG breather system. I have read several times lately that they got the wrong parts when they ordered them. I was almost sent the wrong system when I ordered mine, caught it at the last minute and changed the order.

You can do a compression test and see if you are having piston blow by but these cars really don't run well with low compression so I doubt that's the issue.
Compression Test - Volvo S70 GLT, 1998

As for the mileage counting to fast, my guess would be that you somehow switched the car to KM with the OBD-I tool. The difference that you have described is about that amount.

 

Wouldn't the same year vehicle with the S motor have the same oil separator? I pulled these parts from a clean junkyard engine and just bought a new intake manifold gasket and bottom hose and clamp for the separator. The car is running great now.

 

Nope. For some reason the very smart people (engineers) thought it would be a good idea to make changes through the year model.

 

Your car may or may not be on its last leg.

As mentioned by rspi, the 850s came with a few different types of PCV systems. You need to get the exact matching kit, as well as periodically replace it.

>I pulled these parts from a clean junkyard engine
You don't want to do that on a Volvo, unless if you have the maintenance record.

I assume the actual mileage of the car is still stored in the ECU. Not sure about the odometer outperforming the car. This was either contributed by a member here or another Volvo forum or found on-line.

As long as you have the DTC boxes up under the hood ('93-'95).
1. Switch ignition on
2. Connect the fly wire to socket - A7
3. Push button 5 times
4. When LED comes on and stays on, enter code 1-1-1 as follows:
- press the button once when LED is still on
- wait for LED to go out and come on again
- press the button once when LED is still on
- wait for LED to go out and come on again
- press the button once when LED is still on
- read off response, which will be the last three digits of the odometer miles
5. Repeat steps #3-4, but enter code 1-1-2 (that is, press the button twice on the last step); read off the response, which will be the first three digits of the odometer miles. If you have less than 100,000 miles, the first digit will read as 10 blinks.

I hope this is of some use.

JPN

 

I believe the OP is saying that the odo went haywire since the PCV change.

 

Although it would be completely unrelated to the PCV servicing there is a toggle mode between miles and kilometers in the instrument cluster. The procedure to determine the "geographical region" where the instrument cluster is programmed to is read via Mode 5, the same as reading the actual mileage, except you enter code 1-2-4 rather than 1-1-1 and 1-1-2.

The Volvo technical training manual I have is very good about explaining how to read and set the cluster to the correct region but it fails to provide any information about what codes correspond to which regions.

Push comes to shove I can read the code out on my '94 for statute miles.

...Lee

 

When I find my disk or take the time to read my PDF manual, I'll see if there are instructions in there to change it.

 

So I was able to get the proper code entered and am now properly recording my mileage. I also found out that, per the computer, there are 207,000 miles on my vehicle.

I will check the codes that came up yesterday and report back. Thanks for the help.

 

Excellent, I hope your 850 (the odometer) comes back to service

JPN