I had ALL 8 cylinders and wires changed... when i got my car back..the check engine light is STILL ON... a code: #4 Cylinder is still misfire'n??? and the mechanics can't figure it out... what's up with that??
Thanks .. I did have my head gasket replaced...infact the shop had to do the work twice... i'm going to have to confirm this with them.. thanks again!!!!!!!!!Thanks .. I did have my head gasket replaced...infact the shop had to do the work twice... i'm going to have to confirm this with them.. thanks again!!!!!!!!!
AnonymousMar 05, 2009
It makes me wonder because I just changed all the spark plugs and wiring and now thinking about the ignition coil but the head gasket is leaking so it makes me wonder. Getting misfire reading on OBD readout. It makes me wonder because I just changed all the spark plugs and wiring and now thinking about the ignition coil but the head gasket is leaking so it makes me wonder. Getting misfire reading on OBD readout.
Hi the most likely fault would probably be head gasket, it maywell show no other signs of fault as it can blow into next cylinder.
Have a compression test carryed out and all 8 cylinders should be within 10% of each other.
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Jeep Liberty Check Engine Light/Misfire Due to Intake Valve Locks/Valves. ...Misfire cyc 4 and random cyc misfires, changed coil packs and plugs... sounds as if rod ... Light came on again (misfire on cylinder 4) - switched coil from 4 to 2. Light ...
CarGurusMay 27, 2009 - #4 misfire new plugs and coil pack on #4 light came back on after 300 miles if ... How come it stopped misfiring for 2-3 months, and now is back? ... I have a 2005 Jeep Liberty 6 cylinder, engine light came on scaned the codes ...
Misfire could be a number of things: a) spark plugs - change them if used over 15K miles - inspect/regap. b) spark plug wires - change them if over 15K miles - inspect c) ECM (electronic control module) - test with HEI (high energy ignition) tester.
The vibrating tells me that the engine is running on less than its normal
compliment of cylinders - the shaking is produced by the imbalance
caused in the engine by one (or more) cylinder(s) not firing at all.
The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be lit - the code coming from your truck's computer will probably be one or more of: P0300 - Random/Multiple Cylinder misfire detected P0301 - Cylinder 1 misfire detected P0302 - Cylinder 2 misfire detected P0303 - Cylinder 3 misfire detected P0304 - Cylinder 4 misfire detected P0305 - Cylinder 5 misfire detected P0306 - Cylinder 6 misfire detected P0307 - Cylinder 7 misfire detected P0308 - Cylinder 8 misfire detected P0313 - Misfire detected with low fuel
Misfire could be a number of things: a) spark plugs - change them if used over 15K miles - inspect/regap. b) spark plug wires - change them if over 15K miles - inspect c) ECM (electronic control module) - test with HEI (high energy ignition) tester.
The shaking tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s) not firing at all.
The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be lit - the code coming from your truck's computer will probably be one or more of: P0300 - Random/Multiple Cylinder misfire detected P0301 - Cylinder 1 misfire detected P0302 - Cylinder 2 misfire detected P0303 - Cylinder 3 misfire detected P0304 - Cylinder 4 misfire detected P0305 - Cylinder 5 misfire detected P0306 - Cylinder 6 misfire detected P0307 - Cylinder 7 misfire detected P0308 - Cylinder 8 misfire detected P0313 - Misfire detected with low fuel
DO SPARK PLUGS AND WIRES CHANGE IF NOT HAVE DONE TUNE UP IN A LONG WHILE. CLEAN FUEL INJECTORS.CLOGGED FUEL INJECTORS WILL CAUSE CYLINDER MISFIRE ALSO.
HI, a quick way to check and see if the new plug and wire weren't bad when you bought them is to change the #4 plug and wire to another cylinder. Then if the misfire code shows up on that cylinder and not #4 then you know where the problem is.
If it doesn't change from Cylinder #4 then the problem is most likely internal to that cylinder. The most common problem i have seen is carbon build up on the back of the valves. The carbon will heat up and be able to ignite the fuel and cause a misfire in the problem cylinder. You can try after market additives to clean the deposits or have it professionally done. Good Luck
Hello I need a help. I have 1999 lincoln town car 4.6L V8.They have check engine light on. P 0303 cylinder 3 missfire. I was changed spark plugs,fuel filter. check compression test 150psi. fuel pressuer 50. swiching cylinder 1 to 3 fuel injector and coil. but they still have engine code
Thanks .. I did have my head gasket replaced...infact the shop had to do the work twice... i'm going to have to confirm this with them.. thanks again!!!!!!!!!
It makes me wonder because I just changed all the spark plugs and wiring and now thinking about the ignition coil but the head gasket is leaking so it makes me wonder. Getting misfire reading on OBD readout.
Have all the ignition leads and plugs been inspected.
Try changing the plug with another one.
You do get rogue spark plugs now and then.
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