3.9 V8 Fuel Injectors

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Author Message   Bazzle (Bazzle) New Member Username: Bazzle Post Number: 19 Registered: 09-2003 Posted on Tuesday, September 30, 2003 - 04:24 pm:    Ive been tracing a slight missfire from time to time. Replaced plugs, rotor, cap and leads. Made no difference. Rechecked plugs after a run and they were all sooty on one side, white on the other. I am assuming this means either they are all dripping fuel or mixture too rich. Is mixture manually set (no cats) or temp controlled?/ Any ideas welcomed   Joey (Joey4420) Senior Member Username: Joey4420 Post Number: 266 Registered: 04-2003 Posted on Tuesday, September 30, 2003 - 06:11 pm:    No Cats, then I take it the Disco is not a NAS version. If NAS and no cats that is the problem. If non-NAS then I believe it is controlled by the ECU. I am sure someone will correct me if I am wrong.   Bazzle (Bazzle) New Member Username: Bazzle Post Number: 21 Registered: 09-2003 Posted on Tuesday, September 30, 2003 - 06:58 pm:    Sorry Australian delivery 1998 Series 1. Maybe a temp sensor or thermostat not hot enough?? Bazzle   Joey (Joey4420) Senior Member Username: Joey4420 Post Number: 268 Registered: 04-2003 Posted on Tuesday, September 30, 2003 - 07:14 pm:    If it is just one bank, then that would have me thinking something that is electronic. Temp sensor or thermostat would be both banks....wouldn't it?   Ron Brown (Ron) Senior Member Username: Ron Post Number: 489 Registered: 04-2001 Posted on Tuesday, September 30, 2003 - 08:51 pm:    Replace the O2 sensor on the offending side, or if you are cheap, swap them and see if the problem moves. Ron   Geoff 93 RRC (Geoff) Member Username: Geoff Post Number: 111 Registered: 11-2002 Posted on Tuesday, September 30, 2003 - 09:22 pm:    The water temp sensor (cheap/easy to change) tells the ECU that the engine is in warm up or not, so could be the culprit. Sounds like o2 sensors. The '97 Aussie version we had didn't run cleanly to begin with. No emission controls and low compression export v-8. Yours may need a good hot run to blow out carbon (especially if possibly accumulated on exhaust valves) if you do mainly city driving.   John Hamblin (Jhmover) New Member Username: Jhmover Post Number: 28 Registered: 02-2003 Posted on Tuesday, September 30, 2003 - 11:05 pm:    Mine was doing that, turned out to be the coils were going bad on 2 cylinders. We tried plugs, no difference, mine mainly did it under load, so I was thinking fuel pump, but that wasn't it either finaly was the coils.   Bazzle (Bazzle) New Member Username: Bazzle Post Number: 22 Registered: 09-2003 Posted on Tuesday, September 30, 2003 - 11:34 pm:    Bonza, Thanks for the help Chaps Cheers bazzle