Motor Guys...step in. Misfire
#1
Motor Guys...step in. Misfire
I have a '98 Max with a code for a misfire in the number 4 cylinder.
-I swaped the coil to cylinder 1 and the code still says cylinder 4
-I changed the spark plug...the one that came out was crusty white
-The injector reads 13 Ohms across the terminals
-The car has an obvious misfire, you can hear poping from the exhaust but it doesnt idle rough, except the poping.
I did a compression test on the cylinder and it read 120 but I didnt unplug the coils or take the fuel pump fuse out, so the car turned over when I did the test...i'm not sure if that changes anything.
HELP PLEASE!!!!!!!! My gas milage its crap!
-I swaped the coil to cylinder 1 and the code still says cylinder 4
-I changed the spark plug...the one that came out was crusty white
-The injector reads 13 Ohms across the terminals
-The car has an obvious misfire, you can hear poping from the exhaust but it doesnt idle rough, except the poping.
I did a compression test on the cylinder and it read 120 but I didnt unplug the coils or take the fuel pump fuse out, so the car turned over when I did the test...i'm not sure if that changes anything.
HELP PLEASE!!!!!!!! My gas milage its crap!
#2
Chances are you have oil leaving into your valve cover...Are the bottom of your coil packs brown? if so, go ahead and replace the valve cover, to save u from having to buy some coil packs again down the road. try taking the plug off of coil pack in cylinder 4 and see if the car bogs down or changes in idle/running manner.
Also, theres a slight possiblity that your fuel pump may be going bad, not getting enough fuel to the injectors possibly.Check the fuel pump pressure, your fuel pump may be failing. If a major tune up has not been done recently, this could be the cause of your problem.
Also, theres a slight possiblity that your fuel pump may be going bad, not getting enough fuel to the injectors possibly.Check the fuel pump pressure, your fuel pump may be failing. If a major tune up has not been done recently, this could be the cause of your problem.
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