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I've been trying to figure out these misfires ever since I finished the rebuild. I've ruled out plugs (new), plug wires, CATs (removed), O2 sensors, and coil packs. I checked the reluctor tabs, cleaned the MAF thoroughly, and now replaced all the injector O-rings. It runs well except for these codes. The only time I'd know something is off, is when it very rarely and briefly "hiccups". Have I missed a possibility?
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97 Discovery SE7 163K
Last edited by EricTyrrell; 02-12-2012 at 06:12 PM.
Eric, does your truck have AEL ?, they started with that in mid 1997 models.....
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98 DI, 203,000 MI...head gaskets, new starter, replaced cracked ex manifold, replaced ex system tires...cooper "discoverers" , 60,000mi service done every year,cheap champion plugs, remanned steering box, back door hinges, rear window lift ecu bypass, several other repairs...most all work done myself
I agree with Danny, it may very well be a vac problem......an "Advanced " vac problem..I've been getting random misfire codes & misfire causing excessive emissions codes off and on all winter as well as the dreaded P1447 even though the truck seems to be working well. I'm not completely satisfied that I've cured it yet but I think I'm on to something....for now humor me and just try this........I know you say all your lines are new......but remove the canister purge line where it hooks into the intake plenum ( near the throttle body) and cap off the fitting that sticks out of the plenum with a rubber cap, clear your codes and drive it like ya stole it and see if they come back. if something has gone haywire in the evap system you might be getting a leak through that .
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98 DI, 203,000 MI...head gaskets, new starter, replaced cracked ex manifold, replaced ex system tires...cooper "discoverers" , 60,000mi service done every year,cheap champion plugs, remanned steering box, back door hinges, rear window lift ecu bypass, several other repairs...most all work done myself
If you don't find a vacuum leak (intake) it's usually fuel injectors, usually over fueling. The ECM/ECU cannot correct it. Time to check them out. Leak down test. Because the originals are expensive most modders replace with the Ford SB V8, much less expensive. Same ohm and pound rating. What plugs are you using?
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97 SD Altai Silver
The three-position Lucas switch--DIM, FLICKER and OFF.
The other three switch settings--SMOKE, SMOLDER and IGNITE.
Doesn't give me much hope for my P1313. Was hoping it was wires and plugs and planning for new cats. All of which I need anyway but I'd like to nail it too. At least I don't have that AEL. Eric...it looks like you will reach "better than new" status in the near future.
War on Misfires
