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Cylinders 3&4?


Andy 3i

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Are these somehow connected electronically? Basically I've got an epic misfire and my car is running on cylinders 1&2. I've changed plugs, leads, coil and recently injectors. I've got live and earth at the injectors, used a noid light and they are working (as far as the ecu side of things is going). I havent actually measured the compression with a tester...but with a plug out it you can hear it has compression (i'll get a tester from work to confirm next week). Basically I'm scratching my head as to what it could be. Part if me is thinking maybe a knock sensor (if zetecs have one) or maybe my edis module is messing around. Or possibly ecu as I've somewhat bypassed the edis? Any ideas would be greatly appreciated :(
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Are these somehow connected electronically? Basically I've got an epic misfire and my car is running on cylinders 1&2. I've changed plugs, leads, coil and recently injectors. I've got live and earth at the injectors, used a noid light and they are working (as far as the ecu side of things is going). I havent actually measured the compression with a tester...but with a plug out it you can hear it has compression (i'll get a tester from work to confirm next week). Basically I'm scratching my head as to what it could be. Part if me is thinking maybe a knock sensor (if zetecs have one) or maybe my edis module is messing around. Or possibly ecu as I've somewhat bypassed the edis? Any ideas would be greatly appreciated :(

i think you realy need to do a compression test first :thumb:

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I will try and get a compression test tomorrow :). Stu, that's what I was thinking but I wanted to double check :). I haven't checked if they're getting 3.5v running...but the noid light was flashing. It's really baffling me. What sort of compression should I expect from it? 12-14 bar?
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I will try and get a compression test tomorrow :). Stu, that's what I was thinking but I wanted to double check :). I haven't checked if they're getting 3.5v running...but the noid light was flashing. It's really baffling me. What sort of compression should I expect from it? 12-14 bar?

about 175 psi throttle open /all plugs removed and its important that they are all similar pressures too

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Yeah, was working perfect then on my way home I was pottering at about 20-25 and it just all of a sudden started missing. The only thing I changed was put new number plates on and I put the passenger side inner kick panel on because its been off for ages. It's a constant misfire, doesn't go away at all. I'll try and get a tester on it today to check compression but if that comes back a-ok then I don't know what the hell has gone wrong ?(
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Yeah, I've run the wires from the edis module inside the wheel arch. I did double check the wiring to the ecu to make sure no wires were trapped or anything...everything looked ok. Even if the wiring was duff the noid lights wouldn't go off and have spark at the plugs. Baffling :(
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