engine trouble codes

[akrockhound]

I have been getting repeated engine light codes which equate to misfires in cylinders 1,3,5 and 7 on my 2000 Disco II.

Does the fact that the codes all relate to the odd-numbered cylinders narrow down the likely cause to anything particular??

Do these codes necessarily mean an ignition (electrical) issue or could it relate to air/fuel flow problems on that side of the engine?

Any ideas might be helpful as I try and track this down without spending a fortune.

[phantomracer]

if you dont see any obvious problem (spark arcs etc), pull the plugs and look at them. If they look good...

I would try and throw some fuel system cleaner in (like techron) and run a bottle or 2 through over a few tanks of gas...

Probably have sticky valves..very common problem..dealer will tell you that you need a valve job..but I found that techron usually cleans it out (ie no misfire codes) for 6-12 months

worth a shot before spending 3-4K on a valve job

[akrockhound]

Yup

That's also what Robison Service said (sticky valves) but the engine really seems to run pretty good so I will try the Techron solution first.

I wonder what steps you can take to avoid this problem if you are starting out with a fresh engine?

I have 90K on mine right now. I have a second one with 120K but moslty highway miles and it has never thrown a trouble code

[phantomracer]

That's also what Robison Service said (sticky valves) but the engine really seems to run pretty good so I will try the Techron solution first.

I wonder what steps you can take to avoid this problem if you are starting out with a fresh engine?

I have 90K on mine right now. I have a second one with 120K but moslty highway miles and it has never thrown a trouble code

to avoid the problem...I just throw a bottle in every 6 months or every oil change.. sure seems to work..sure beats a valve job IMO.. Seems the rover is the only car I have that seems to do this

Everything I have read says that this (fuel system cleaner) DOES NOT WORK. But my experience doesn't reflect that. After being told I NEED a valve job..figured I had nothing to lose...try the techron..the results were instant (well within a tank of gas anyway)..of course this is the experience on my rover.

YMMV

It may or may not work for everyone..but i think it is worth $10 to try one or 2. Give it a tank or 2 to work.

Of course check the wires, plugs, etc..but if everything looks good..try it ..nothing to lose.

If you try it...get the 20 oz bottle..or dont fill your tank full using the 12 oz bottle..and make sure it is the fuel system cleaner..not fuel injector cleaner (bottles look very similar)

Paul

[tempestv8]

Try applying this product called SEAFOAM.

Codes as follows if you have an OBDII scanner. Most of these are Disco I but should also apply to DII:

P1130 Oxygen Sensor Fuel Trim at Limit *Codes* A U
P1131 Oxygen Sensor Engine Lean *Codes* A U
P1132 Oxygen Sensor Engine Rich *Codes* A U
P1137 Oxygen Sensor Engine Lean *Codes* A D
P1138 Oxygen Sensor Engine Rich *Codes* A D
P1150 Oxygen Sensor Fuel Trim at Limit *Codes* B U
P1151 Oxygen Sensor Engine Lean *Codes* B U
P1152 Oxygen Sensor Engine Rich *Codes* B U
P1157 Oxygen Sensor Engine Lean *Codes* B D
P1158 Oxygen Sensor Engine Rich *Codes* B D
P1171 Oxygen Sensor System Too Lean Fault Banks A & B
P1172 Oxygen Sensor System Too Rich Fault Banks A & B
P1176 Maximum Positive FMFR Correction Fault
P1177 Maximum Negative FMFR Correction Fault
P1178 Maximum Positive AMFR Correction Fault
P1179 Maximum Negative AMFR Correction Fault
P1185 Oxygen Sensor Heater Circuit Open Upstream
P1186 Oxygen Sensor Heater Circuit Short Upstream
P1187 Oxygen Sensor Heater Circuit Short Upstream
P1188 Oxygen Sensor Heater High Resistance Upstream
P1189 Oxygen Sensor Heater Type 1 Low Resistance Upstream
P1190 Oxygen Sensor Heater Type 2 Low Resistance Upstream
P1191 Oxygen Sensor Heater Circuit Open Downstream
P1192 Oxygen Sensor Heater Circuit Short Downstream
P1193 Oxygen Sensor Heater Circuit Open Downstream
P1194 Oxygen Sensor Heater High Resistance Downstream
P1195 Oxygen Sensor Heater Type 1 Low Resistance Downstream
P1196 Oxygen Sensor Heater Type 2 Low Resistance Downstream
P1199 Fuel Level Sensor Circuit Fault
P1201 Injector 1 Open Circuit or Ground Short Fault
P1202 Injector 2 Open Circuit or Ground Short Fault
P1203 Injector 3 Open Circuit or Ground Short Fault
P1204 Injector 4 Open Circuit or Ground Short Fault
P1205 Injector 5 Open Circuit or Ground Short Fault
P1206 Injector 6 Open Circuit or Ground Short Fault
P1207 Injector 7 Open Circuit or Ground Short Fault
P1208 Injector 8 Open Circuit or Ground Short Fault
P1313 Misfire Catalyst Damage Fault Bank A
P1314 Misfire Catalyst Damage Fault Bank B
P1315 Misfire Persistent Fault
P1316 Misfire Excessive Emissions Fault
P1317 ABS Rough Road Line Low Fault
P1318 ABS Rough Road Line High Fault
P1361 No Ignition Coil Activation Fault Coil 1
P1362 No Ignition Coil Activation Fault Coil 2
P1363 No Ignition Coil Activation Fault Coil 3
P1364 No Ignition Coil Activation Fault Coil 4
P1371 Early Ignition Coil Activation Fault Coil 1
P1372 Early Ignition Coil Activation Fault Coil 2
P1373 Early Ignition Coil Activation Fault Coil 3
P1374 Early Ignition Coil Activation Fault Coil 4
P1440 Evap System Purge Valve Stuck Open Fault
P1441 Evap System Purge Valve Flow 1 Fault
P1442 Evap System Purge Valve Blocked Fault
P1447 Evap System Purge Valve Open or Short Circuit Fault
P1448 Evap System Purge Valve Flow 2 Fault
P1508 Idle Speed Control Open Circuit Fault
P15O9 Idle Speed Control Short Circuit Fault
P1514 Neutral Drive Load Fault
P1516 Neutral Drive Gear Change Fault
P1517 Neutral Drive Cranking Fault
P1607 Malfunction Indicator Lamp Short Circuit Fault
P1608 Malfunction Indicator Lamp Open Circuit Fault
P1620 Reprogramming Code Learn Fault
P1621 Serial Data Link Dead Fault
P1622 Repeated Wrong ECM Security Code Fault
P1623 ECM Security Code Fault
P1701 Transfer Box Line Fault
P1703 Transfer Box Line Open Circuit Fault
P1708 Transfer Box Line Short Circuit Fault
P1775 Gearbox Fault
P1776 Gearbox Ignition Retard Request Timeout Fault
P1777 Gearbox Ignition Retard Request Line Fault