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200 Series General Forum for the Volvo 240 and 260 cars |
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V6 not startingViews : 12019 Replies : 76Users Viewing This Thread : |
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Mar 6th, 2022, 22:22 | #29 | |
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Join Date: May 2012
Location: Lakenheath
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As for the cold start injector potentially being jammed open, if it is the clue is in the statement - removing the power feed to it won't alter it if it's physically stuck open. However i think your problem is a bit more basic than that. I suspect because the original injectors were so dirty/gummed up, the mixture was progressively richened over the years to give a satisfactory idle. Bear in mind there is no closed loop mixture feedback as with a Lambda sensor and ECU, once the misture screw is set to rich, it stays there until altered again. Imagine new injectors capable of flowing what they should running on a fuel distributor set to excessively rich to compensate for previously blocked injnectors! You see where i'm going with this? It could also be the warm-up regulator on the fuel distributor but let's go for the most likely first. Find the mixture screw (3mm Allen key should fit) and turn it 1/3 turn (2 flats on the Allen Key) anticlockwise, refuel and try again. As it warms up , if/when it starts to run rough again, turn the Allen Key in 1/3 turn increments until it remains smooth. If you find it goes lean by turning 1/3 of a turn, go back halfway to where it was before (1/6 turn/1flat) clockwise. Keep doing this until it warms up completely and runs satisfactorily, if you then have cold start problems it's time to look at the cold start injector but that might be working ok.
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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