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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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740 poor running and stallingViews : 20925 Replies : 119Users Viewing This Thread : |
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Nov 14th, 2021, 18:41 | #101 |
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No, not reverse threaded. Likely to be tight because the garage probably did them up with a windy ratchet, find yourself a 6-sided socket and a dent ratchet and you should be able to shift them.
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Nov 14th, 2021, 19:41 | #102 | |
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Nov 14th, 2021, 20:25 | #103 |
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Nov 14th, 2021, 20:44 | #104 | |
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Nov 25th, 2021, 18:17 | #105 |
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Earlier I got my dad to take the injectors out and put them into a jar to see if there is an equal amount of fuel coming out since for some reason we hadn't done that ourselves yet.
Here are the results after turning over the engine for 5ish seconds: Injector 1 = About half a cm of fuel Injector 2 = Nothing Injector 3 = About half a cm of fuel Injector 4 = Didn't stop spraying fuel until the car was turned off Tomorrow he's going to remove injector 2 and then do the same thing to see whether it is the distributor or fuel line that is the problem. I know it's K-Jet which means continuous so does that mean that without the injector there fuel should be continuously flowing out? |
Nov 25th, 2021, 21:15 | #106 | ||
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Here are the results after turning over the engine for 5ish seconds: Injector 1 = About half a cm of fuel Injector 2 = Nothing Injector 3 = About half a cm of fuel Injector 4 = Didn't stop spraying fuel until the car was turned off Tomorrow he's going to remove injector 2 and then do the same thing to see whether it is the distributor or fuel line that is the problem. I know it's K-Jet which means continuous so does that mean that without the injector there fuel should be continuously flowing out? |
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Nov 25th, 2021, 21:24 | #107 | |
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As long as the pressure is above a certain level (i think i put it somewhere else in the thread) all injectors should spray equally and continuously and once the pressure drops, all should stop about the same time. Without the injectors fuel will flow continuously from the fuel lines with the pumps running.
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Dec 6th, 2021, 16:13 | #108 | |
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Dec 6th, 2021, 17:06 | #109 |
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I suspect someone has played with the mixture adjusting screw on the fuel distributor to keep it running due to the clogging injectors. Also check the cold start injector isn't staying on past 8 seconds as that will flood the engine.
Bear in mind it could be burning off previous excess fuel from aborted start attempts. As a first "go/no-go" test of the cold start injector, i would suggest getting it started from cold then pulling the plug off the cold start injector - squeeze the wire clip and pull the plug away from the injector at the same time. If you locate the mixture screw on the fuel distributor, use an Allen key to make the mixture leaner once it's warmed up a bit until it sounds "happiest" once hot and idling. Bit of a Heath-Robinson method but should get you to a paoint where you are able to adjust the mixture in the MoT bay. Once you've done that, reconnecting the cold start injector plug will show whether it has a permanent feed or not, if it does, a quick solution would be to install a pushbutton switch on the cabin that you can press for cold starts and release once running. I am guessing the important bit here is to get it MoT'd/drivable so while these methods aren't ideal, they will get you up and running and the rest can be sorted properly after you have that vital bit of paper from the MoT station.
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Dec 6th, 2021, 19:41 | #110 | |
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740, 940, b200e, stalling, throttle lag |
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