Ok,
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My car started playing up a bit some time back missfiring.
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I knew one injector had previously stuck open.
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I could move that injector round and the mis followed the cylinder it was in.
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I put in new injectors with same part number
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(Seimens 872cc
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/ 85lb/hr).
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The missfire seemed to go, but I thought the car felt like it was a little rich, occasionally missed in first and on heavy boost.
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The miss got a bit more regular and the car idled a bit crap.
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Tried all the obvious ignition things to no avail, so I got the old injectors serviced
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(knowing the flowed right for the map) and got them re-fitted.
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The car was still missing.
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So I have played with an old dizzy cap
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(copper contacts) and cleaned the almost new one which was fitted, fitted a new rotor arm and have fitted a new ignition coil.
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I tried taking off the leads and swapping with spares and even resistance checked them and they seem fine.
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I have ordered a new set anyway.
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Tonight whilst still trying I noticed the car seemed really rich and the exhaust was a bit white, misfire worsening.
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I checked in the exhaust pipe and some fuel had pooled in it! I swapped back again to the new injectors to try them, having lost confidence in the cleaned/serviced ones.
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The car is still heavily missfiring.
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Whilst messing about, pulling off the no.
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2 and 3 leads has least affect on idle whereas 1 and 4 causes the car to almost cut out.
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Now the miss on idle is bad enough to make it struggle to keep running and its running stupid rich.
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Pulling off any lead causes problems.
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I'm scratching my head as even if I lost a spark to two cylinders I cannot imagine this much fuel getting through? I wondered if my injector loom has developed a short
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(maybe got hot).
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So anyone got ANY idea.
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MY next option is probably to try fault finding on the injector harness, or to find out if the Motec does a simple check of whats connected? I'm think about doing a resistance check of the loop with each injector on and from the same loop to ground?
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HELP!