Oil exiting the crankcase breather

[Jose]

Glyn,

my XJ-6 starts and runs as smooth as a new car, doesn't smoke, I am the only smoker around it.

[Glyn Ruck]

That might be so but it will still have a fouled inlet & not be achieving peak efficiency!

I also smoke worse than my Jag.

[NigelW]

I've got to pull the engine on my XJ soon and strip it down to sort out a strange noise coming from it, it uses the factory system for venting so I'll report back with what I find.

[Glyn Ruck]

I've got to pull the engine on my XJ soon and strip it down to sort out a strange noise coming from it, it uses the factory system for venting so I'll report back with what I find.

On a carburettor engine if you are using decent fuel everything after the carbs should be clean. Fuel injected everything before the injectors will be dirty. The higher the mileage the dirtier it will be.

As an oil industry we have spent a fortune over the years trying to keep inlet systems clean. Modern direct injection engines have just made that very difficult ~ again!

Captive breathers & EGR systems are both a curse.

[NigelW]

I have two modern VW's (petrol) and this EGR business is always a worry.

[cass3958]

I have a Jaguar X Type 2.0 diesel and I have had to remove the EGR as I was having starting problems and stumbling whilst running. When you tried to start it it seemed to only wake up on two cylinders and stumble along for a minute. You had to switch off and start again. I removed the EGR and have never had a problem since although I did have to have the ECU remapped to clear the little light on the dash telling me the EGR was faulty/not there.You have to leave the EGR in place but blank off the pipes going in and out so none of the exhaust gasses are sent in to the cylinder head. I did take my EGR off, gave it a good clean and I spent a day chipping off the exhaust slag from the inside but still decided to blank it off and remove it from the ECU.

[Jose]

if it ain't broke, don't fix it!

most XJ-6 owners remove the GM Delco air pump and all related hardware to get more "efficiency" and then they complain about the engine not running as it used to.

My XJ-6 engine is intact. Bought in 1989 from a doctor who had it sitting outside under a tree, because it wasn't "charging". Sure, the battery was dead. I brought a new battery and took it home. Then he calls me 3 months later wanting the car back because I passed him on Interstate 40 going 100 mph. No way Jose, I told him. I'll pay you more than you paid me, he said. NO means no Doc. Thank you but no. Best dammed car I ever had since my first car in 1969. I get 525 miles on the highway out of its twin tanks before needing to refuel, doing 72 mph with a/c running. The distance between Florida and Tennessee is around 830 miles, so I refill once and then have plenty fuel left when I arrive.

The S type only goes 225 miles by comparison.

[cass3958]

I get 525 miles on the highway out of its twin tanks before needing to refuel, doing 72 mph with a/c running. The distance between Florida and Tennessee is around 830 miles, so I refill once and then have plenty fuel left when I arrive.

The S type only goes 225 miles by comparison.

Difference there Jose is the Xj6 has two 12 gallon tanks compared to the S Type which has two 7 gallon tanks so a difference of 10 gallons in capacity.
Your XJ6 is doing 21 mpg and the S type is doing 16 mpg by your calculations but more fuel lets you go further before you have to refill. In the USA it probably costs you $5 to fill up. In the UK that would be £90 that's $120 to fill the S Type.
Official figures have the XJ6 at 17 mpg and the S Type at 18 mpg.

[NigelW]

It costs £150 to fill up my XJ with super unleaded.

[Glyn Ruck]

In the US you can buy an old Jag for about the cost of a tank of gas so people are not inclined to look after them.

1984 XJ6 fuel capacity = 23.5 U.S. gallons or 19.6 imperial gallons.

S type has two 7 imperial gallon tanks or 8.25 U.S. gallon tanks. Thus capacity = 17.5 USG or 14 imperial gallons.

That means the S Type is only doing 12.85 miles per USG ~ something is wrong ~ heavy foot (comparing apples with pears), tired or out of tune engine etc.

The fact remains that captive breathers are bad news.