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200 Series General Forum for the Volvo 240 and 260 cars |
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<10mpg! Running horribly rich.Views : 2100 Replies : 19Users Viewing This Thread : |
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Aug 4th, 2013, 12:55 | #1 | |
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Last Online: Jul 9th, 2022 02:51
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Location: Middlesbrough
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<10mpg! Running horribly rich.
Hi all, thought I'd start a new thread away from a intro post to encourage some more input although Paul has been helpful. Car is running very rough, at 1100 rpm. Then it drops to a very lumpy juddery 700rpm and you can just smell the fuel dumping in the system. Paul offered the below advice....but was puzzled by the result.
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Engine is a B200E, car is an 1988 244 Auto GL. |
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Aug 4th, 2013, 13:28 | #2 |
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Last Online: Yesterday 21:46
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You need a set of injector holder to head O rings , whilst you are changing them do the injector to holder seal rings too . Air is being sucked in , then people have to richen the mixture to get the engine running better . So when you have changed these seals you will have to get the CO adjusted back to about 1.5 % ... to make the engine run as intended ..
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Aug 4th, 2013, 22:00 | #3 |
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So, the O rings and injector seals need changing and then would you expect the hissing to stop? Or not until the adjustment screw is altered?
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Aug 4th, 2013, 22:05 | #4 |
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hissing from the injectors ? pour some water around each injector base , if you hear sucking noises they are leaking in air , the engine will probabaly stall . The engine will not run correctly until the CO has been adjusted , assuming someone has tweeked it to run properly with partialy leaking injector seals at some point ..
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Aug 4th, 2013, 22:59 | #5 |
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That's the thing, not sure if the hissing is from injectors or manifold. When I sprayed the manifold with Easy Start it stalled yes.
Maybe now the manifold gasket has been replaced, I just need to adjust the mixture to compensate for the, now correct, air flow. Just wasn't expecting hissing still which is why I assumed there was still a big leak from somewhere. Could you envisage a scenario whereby adjusting the mixture would stop the hiss? If not, assuming Volvo engines don't hiss normally, I guess it's change the injector seals as a matter of course and if necessary, re-change the inlet manifold gasket again. Where is the best place to order the seals and O-rings you speak of? |
Aug 5th, 2013, 12:09 | #6 |
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IMO not much point in changing things until you've found out the cause of the hiss. Might just be a split in one of the pipes under vacuum, possibly a servo hose but there are several to check. May mean you have to take them off one by one but a small split underneath is all it takes. With a leak the engine will think it's running weak and tell the ECU to add more fuel. Although things get hot pretty quick, a cloth in your hand can wrap round various joins an joints to show a change in the hiss or you can chase it with a length of hose. One end in the ear and the other moving around the top of the engine.
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