Bad Idle and Horrible Mileage
#1
Bad Idle and Horrible Mileage
Hello Everyone,
I have a 2000 Land Rover Discovery Series II with the Bosch 4.0 engine.
The engine light is on and flashes, and I have had it checked and the codes are: Multiple cylinder Misfires, cylinder 2 misfire, and cylinder 3 misfire. First thing I have done is change out the plugs, they were all in very bad shape, though the ones for 2 and 3 were burned. They were so far gone you could drive a semi through the gap! I used OEM Champions as replacement. At this point I did not replace the wires yet. I got a lot of my power back, and the idling seemed to be better. Codes were cleared. Now the same problem has come back after about half an hour of driving. Same codes as before. I plan on replacing the wires with the magnecor 8mm wires. I plan on doing this without removing the IM as I have found the instructions on how to do it through this forum. Also it should be noted I do not have secondary air.
If I have the same problem still after this is done, I will be replacing the coil packs. My question is: If after replacing wires and coil pack, I still get the same problem, is there something else I should be checking that would be something I could check/possibly replace without special tools? Also my gas mileage has gone down a lot. I was getting a hair under 400 miles to a full tank using 93 octane. I am now getting barely 200 miles to a full tank. I am pretty sure this is because I am only running on 6 out of 8 cylinders.
Air filter is fine, and am wondering if I solve the misfire problem if that will fix my mileage problem.
Thank you for any help in this matter.
I have a 2000 Land Rover Discovery Series II with the Bosch 4.0 engine.
The engine light is on and flashes, and I have had it checked and the codes are: Multiple cylinder Misfires, cylinder 2 misfire, and cylinder 3 misfire. First thing I have done is change out the plugs, they were all in very bad shape, though the ones for 2 and 3 were burned. They were so far gone you could drive a semi through the gap! I used OEM Champions as replacement. At this point I did not replace the wires yet. I got a lot of my power back, and the idling seemed to be better. Codes were cleared. Now the same problem has come back after about half an hour of driving. Same codes as before. I plan on replacing the wires with the magnecor 8mm wires. I plan on doing this without removing the IM as I have found the instructions on how to do it through this forum. Also it should be noted I do not have secondary air.
If I have the same problem still after this is done, I will be replacing the coil packs. My question is: If after replacing wires and coil pack, I still get the same problem, is there something else I should be checking that would be something I could check/possibly replace without special tools? Also my gas mileage has gone down a lot. I was getting a hair under 400 miles to a full tank using 93 octane. I am now getting barely 200 miles to a full tank. I am pretty sure this is because I am only running on 6 out of 8 cylinders.
Air filter is fine, and am wondering if I solve the misfire problem if that will fix my mileage problem.
Thank you for any help in this matter.
#3
#9
#10
If you overfill it some will leak out of the overflow tube.
Replace your plug wires, if you bad MPG is still there then you need new O2 sensors.