Ohh...if it helps, oxygen probes in the exhaust give a reading of about 20:1, which is WAY lean, yet any more fuel and the car gives rich burning symptoms. Maybe the EGR is returning fresh air to the engine, or allowing it to leak into the exhaust, giving a lean burn reading?
wow, that was a long post! Maybe i should get out more.....
Josh
No one has disconnected an EGR before?
People do it on various vehicles, I've never had a Volvo that had it in the first place but it should be obvious how to disconnect it, it's not a complex system.
I've figured out how to do it, i just wanted to know if anyone has had an experience where it has damaged the vehicle to have it disconnected
It won't damage anything, most 240s never had it to begin with, I think it was a California only thing.
You will not do any damage.
Tim. .
Awesome, thanks. Apparently its the Australian model as well, the B23E engine. This week i've used about 15% less fuel with it disconnected, to me that seems a huge gain for a simple procedure. I shall continue to absorb the benefits though :)
Josh
Hi Josh
I'm in Sydney with a 1982 245, B23E engine also. My fuel consumption has also deteriorated. I'm doing 13l/100km with a 50/50 mix of town and freeway. How did you discontect the EGR? About 2 yrs ago I had an exhaust leak which the mechanic said was a hole in the EGR pipe from the exhaust manifold pipe to the EGR that goes around the back of the engine. I also recently cleaned the throttle body - the connection to the throttle body from the EGR pipe was absolutely clogged solid with muck, although the throttle body was quite clean. I noticed that there is also an EGR "valve" down near the starter motor. I'm wondering if that is also completely logged, and if cleaning it will assist.
Anyway, back to original question - how did you disable the EGR?
Any other insights on how to improve KM per litre?
Chris
Simply unplug the vacuum line going towards the valve, near the starter motor like you said. You'll have to plug the line with something, but the valve can be left as it is. The EGR will think the car is always at idle, and will never pass any gasses back through the engine. For me, that was the single biggest cause of economy loss, mine increased by 15%. You may have to adjust the idle slightly after disconnecting it, but nothing serious. I dont think cleaning out the pipes would make a big difference, as if it clogged, the engine would run the same as if it were disconnected, right? Its not really worth trying to revive the system if it is broken. Probably the second biggest KM/L improvement that i notice is just after fresh oil, change it at least every 5-6 months, the engine seems to need it more regularly than others. Ohh....and if it is an auto, make sure the kick down cable is tight enough. Mine had stretched, and so the car was shifting into a gear too low for the application, which put quite a large dint in my consumption.
Let me know how it goes!!
Josh
They sold an E engine mated to a slushbox? Man that thing must be horrid off the line, some cars in Canada got the B23E motor, as far as I know it always had a manual transmission, and what an impressive motor that was. Feels almost as powerful as a stock turbo.
Yeah its a pity isnt it? I think i spoke to you about the possibility of a conversion, its just a bit out of my price range though. Its a shame, like you suggested, 3 speed really doesnt go off the line well. once its moving however the engine produces a surprising amount of power. I find i tend to use the shifter quite a lot to force it into a lower gear, to keep revs in the sweet spot.
It still makes me smile when my 2.4L volvo can overtake cars on the highway with 4L displacements (really shows how crappy Australian engineered cars can be)
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