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Car Forum / Volvo Cars / August 2007Disable EGR? 240
1983 240 w/ B23E engine (Running on LPG) Here is something to ponder; A while back i reported to this forum a strange and sudden loss of economy, thanks to all that gave suggestions. In desperation to fix the problem, i decided to test the operation of the EGR by disconnecting and plugging the controlling vacuum line. I ran the car, and noticed no difference while idling or accelerating, but while cruising the car runs much nicer. The vacuum gauge (also referred to as an economy gauge) was reading about 50% up its scale with EGR connected, now it is sitting at about 15%, and instead of pressing the pedal about 1/4 of the way to cruise at 80km/h, its now happy at about 1/8. This seems like a vacuum problem to me, but the control line i unplugged is connected directly to a diaphragm, no hoses or linkages for it to lose pressure in. Is it possible the EGR is sending too much exhaust back through the system at cruising speed? Has anyone had a similar problem, and can give some insight to how it would be fixed? Is it even worth fixing? here in AUS we don't have emissions testing, and as far as i know the EGR is only there in this particular car to pass these emissions tests. I'm leaning towards just leaving it disconnected, as the car is running nicely without it, but still a little skeptical of long term engine damage, i've heard from some places it can cause detonation. Thanks 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? > 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. > > 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 >> > No one has disconnected an EGR before? >> [quoted text clipped - 5 lines] > 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. > It won't damage anything, most 240s never had it to begin with, I think it > was a California only thing. 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 > > It won't damage anything, most 240s never had it to begin with, I think it > > was a California only thing. [quoted text clipped - 5 lines] > > 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 > 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 >> Anyway, back to original question - how did you disable the EGR? >> [quoted text clipped - 22 lines] > > Let me know how it goes!! 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. > 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) >> They sold an E engine mated to a slushbox? Man that thing must be horrid >> off [quoted text clipped - 9 lines] > 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. The price range can be anything from zero up to thousands depending on how much you pay for the parts. Can't you pick up an old rusted/wrecked manual tranny 240 for a song now? Perhaps they're old enough to be scarce over there? > The price range can be anything from zero up to thousands depending on how > much you pay for the parts. Can't you pick up an old rusted/wrecked manual > tranny 240 for a song now? Perhaps they're old enough to be scarce over > there? Problem is, most go to wreckers, and wreckers around me for some reason charge a fortune for transmissions (and they are almost always stuffed because of the way they transport the cars around the yard). I can get a rebuilt one from a place near me for a few hundred, but when i added up the cost of all the new parts, and the labour involved in changing them over, its just not feasible at the moment, considering the actual value of the car itself (its also my only mode of transport, if i were to screw it up i'd lose my job). Maybe in a year or so when i have some money and time i'll go through with it, if i do, your bound to get an email from me :-p Till then, i'll just have to live with it. > Problem is, most go to wreckers, and wreckers around me for some > reason charge a fortune for transmissions (and they are almost always [quoted text clipped - 8 lines] > > Till then, i'll just have to live with it. I'd look to buy a whole wrecked car, then you have everything you need right there and the cost can be much less than buying the parts piecemeal from a wrecker. When you're done pulling all the bits you want, you can sell the rest for scrap. >> > No one has disconnected an EGR before? >> [quoted text clipped - 5 lines] > 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 You will not do any damage. Tim. . |
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