LR3 won't idle

[jafir]

So I bought a cheap LR3 off craigslist since I had such good luck with my daily driver.

This one was sold to me as maybe needing an engine. I plan to check compression to see if it really needs an engine, but I haven't yet.

Anyway, it feels like it's got a dead misfire and it won't idle and you have to give it some throttle to get it to start most of the time. I find this a little odd, because on my other LR3, I had a bad coil or two, and the thing would still hold the idle just fine.

It doesn't seem to be storing any codes for a misfire, but I don't have it insure or tagged yet, so I haven't driven it, and I know my other car took a while to store the code.

I tried unhooking the MAF sensor and it didn't help the idle, and it also caused some noticeable black smoke out the exhaust. I also swapped the sensor from my other vehicle.

I've swapped the ignition capacitor, because it was the old type, and I had a new one that I didn't need on my other car. I also swapped 4 suspected good coils on one bank, and it seemed to get a little better, but just for a short while. After I swapped the other 3 coils (I only had 7 "good" ones from my old parts stash) it didn't want to idle again. I even tried a couple of the original coils on that bank to see if something was wrong with one of my good coils, and to make sure that 8th coils wasn't my bad one. (still not getting any misfire codes to help find the cylinder)

Can anyone think of anything else that would cause a rough run and won't idle?

 

[jafir]

These are the codes it stores:

FAULT 1 OF 39
ECU: Instrument Pack
CODE:U0010
Medium speed CAN communication bus
(HISTORIC)

FAULT 2 OF 39
ECU: Instrument Pack
CODE:U0010
Medium speed CAN communication bus
(INTERMITTENT)

FAULT 3 OF 39
ECU: Instrument Pack
CODE:U0132
Lost communication with ride level ctrl module / Lost communication with suspension ctrl module A
(INTERMITTENT)

FAULT 4 OF 39
ECU: Instrument Pack
CODE:U0159
Lost communication with parking assist control module 'A'
(INTERMITTENT)

FAULT 5 OF 39
ECU: Instrument Pack
CODE:U0127
Lost communication with tire pressure monitor module
(INTERMITTENT)

FAULT 6 OF 39
ECU: Instrument Pack
CODE:U0138
Lost communication with all terrain control module
(HISTORIC)

FAULT 7 OF 39
ECU: Instrument Pack
CODE:B1A00
Control module
(HISTORIC)

FAULT 8 OF 39
ECU: Instrument Pack
CODE:B1A76
Fuel sender 2 circuit
(INTERMITTENT)

FAULT 9 OF 39
ECU: Instrument Pack
CODE:B1A87
Battery disconnection/electronic control unit reset
(INTERMITTENT)

FAULT 10 OF 39
ECU: Instrument Pack
CODE:B1A00
Control module
(HISTORIC)

FAULT 11 OF 39
ECU: Engine Management
CODE0340
Camshaft position sensor A circuit (bank 1 or single sensor)
(INTERMITTENT)

FAULT 12 OF 39
ECU: Engine Management
CODE0340
Camshaft position sensor A circuit (bank 1 or single sensor)
(INTERMITTENT)

FAULT 13 OF 39
ECU: Automatic Gearbox
CODE:U2023
Control module network signal calibration data
(INTERMITTENT)

FAULT 14 OF 39
ECU: Parking Brake
CODE:FFF0
FAULT NOT IN THE LIST

FAULT 15 OF 39
ECU: Parking Brake
CODE:FFF0
FAULT NOT IN THE LIST

FAULT 16 OF 39
ECU: Ride Level
CODE:U0416
Invalid data received from vehicle dynamics control module
(PENDING)

FAULT 17 OF 39
ECU: Steering Angle Sensor
CODE:C0051
Steering wheel position sensor
(INTERMITTENT)

FAULT 18 OF 39
ECU: Steering Angle Sensor
CODE:U0300
Internal control module software incompatibility
(INTERMITTENT)

FAULT 19 OF 39
ECU: ABS system
CODE:U0401
Invalid data received from engine control module/powertrain control module
(INTERMITTENT)

FAULT 20 OF 39
ECU: All Terrain Control
CODE:U0402
Invalid data received from transmission control module
(PENDING)

FAULT 21 OF 39
ECU: All Terrain Control
CODE:U0416
Invalid data received from vehicle dynamics control module
(PENDING)

FAULT 22 OF 39
ECU: All Terrain Control
CODE:U0421
Invalid data received from ride level control module
(PENDING)

FAULT 23 OF 39
ECU: Airbags/SRS
CODE:B1A00
Control module
(INTERMITTENT)

FAULT 24 OF 39
ECU: HVAC system
CODE:B1A98
Local interconnection network bus circuit 1
(INTERMITTENT)

FAULT 25 OF 39
ECU: HVAC system
CODE:B1B70
Local interconnection network bus circuit 2
(INTERMITTENT)

FAULT 26 OF 39
ECU: HVAC system
CODE:B1B70
Local interconnection network bus circuit 2
(INTERMITTENT)

FAULT 27 OF 39
ECU: HVAC system
CODE:B1B74
Front foot-defrost mode stepper actuator
(INTERMITTENT)

FAULT 28 OF 39
ECU: HVAC system
CODE:B1B75
Front foot-face mode stepper actuator
(INTERMITTENT)

FAULT 29 OF 39
ECU: HVAC system
CODE:B1B76
Front left air blend stepper actuator
(INTERMITTENT)

FAULT 30 OF 39
ECU: HVAC system
CODE:B1B77
Front right air blend stepper actuator
(INTERMITTENT)

FAULT 31 OF 39
ECU: HVAC system
CODE:B1B82
Rear air distribution stepper actuator
(INTERMITTENT)

FAULT 32 OF 39
ECU: HVAC system
CODE:B1B83
Rear air blend stepper actuator
(INTERMITTENT)

FAULT 33 OF 39
ECU: Parking Assist
CODE:B1B46
Rear right inner sensor
(INTERMITTENT)

FAULT 34 OF 39
ECU: Audio Front Control
CODE:U2003
Fibre optic communication bus
(INTERMITTENT)

FAULT 35 OF 39
ECU: Audio Front Control
CODE:U2003
Fibre optic communication bus
(INTERMITTENT)

FAULT 36 OF 39
ECU: Touch Screen
CODE:U2005
Vehicle speed
(INTERMITTENT)

FAULT 37 OF 39
ECU: Satellite Radio
CODE:U3000
Control module
(INTERMITTENT)

FAULT 38 OF 39
ECU: Telephone
CODE:B1A00
Control module
(PERMANENT)

FAULT 39 OF 39
ECU: Telephone
CODE:U3000
Control module
(INTERMITTENT)

I understand that some of the communications errors are probably from the battery going flat for being parked for a while and not driven.

 

[jafir]

The weird stuff in that list above is the cam sensor P0340. It seems to be persistent and always comes back after clearing. I know on most other vehicles I've had cam sensor didn't cause any noticeable problems except maybe a slightly hard start.

Also there is a weird code listed for software incompatibility reported by the SAS.

 

[seventyfive]

Load test the battery and charge it if it's good. Clear faults and concentrate on the faults that return.
V6 or v8?

If the crank case breather (on the passenger bank valve cover) is bad it will cause a rough idle but I doubt it would make it stall.

cam sensors are important, regarding ignition. If cam fault returns swap with a known good sensor. Or swap the banks and see if the fault moves to that bank.

Sounds like you found a diamond in the rough! Good luck.

 

[seventyfive]

Bad crankcase vent valve will also cause smoke, since it's sucking more volume at idle and literally suckin oil into the manifold.

 

[jafir]

Load test the battery and charge it if it's good. Clear faults and concentrate on the faults that return.
V6 or v8?

If the crank case breather (on the passenger bank valve cover) is bad it will cause a rough idle but I doubt it would make it stall.

cam sensors are important, regarding ignition. If cam fault returns swap with a known good sensor. Or swap the banks and see if the fault moves to that bank.

Sounds like you found a diamond in the rough! Good luck.

V8.

One thing I did notice was that all of the coils on one bank were held in with hardware store bolts. I'm guessing someone has been in there trying to figure out what was wrong, and lost the bolts. Hopefully they just left the cam sensor unplugged. I'll troubleshoot that a little more.

 

[jafir]

Bad crankcase vent valve will also cause smoke, since it's sucking more volume at idle and literally suckin oil into the manifold.

Makes sense. We used to have early Honda Accords that would do that to when the guts would break on the plastic PCV valves.

 

[jafir]

So I left the key on in my "good" LR3 and the battery was dead this morning. I put the charger on it for a bit and then tried to start it. I got a bunch of communication error, but what surprised me the most was a couple of misfires. So that got me back to thinking about the new LR3. I tested and then replaced the bad battery with a new AGM battery. Didn't fix the misfire, but I didn't really expect it to. So I swapped the passenger side cam sensors between the two trucks. The good truck still runs and the bad truck still runs like crap. And still has the P0340 code. I guess it's time to dig a little deeper.

 

[*NR*BRENT]

replace the pvc and clean the tube that enters the upper intake / throttle area. Renew the injector filter screens at the fuel rail. clean the comlpete throttle plate, reset fuel adaptions . these are the heavy hitters to resolve misfires

 

[jafir]

replace the pvc and clean the tube that enters the upper intake / throttle area. Renew the injector filter screens at the fuel rail. clean the comlpete throttle plate, reset fuel adaptions . these are the heavy hitters to resolve misfires

Cool. I'll check that stuff out. Do you know will a bad misfire cause a cam sensor code? I was thinking about it the other way around of course. And I still need to do a compression check. I've got myself thinking about a broken cam or something with that cam sensor code, so I should rule that out.

 

[*NR*BRENT]

ive only seen 1 ajv8 that broke a cam. start with a compression check also check the drag/ proper connection at the cam sensor.

 

[jafir]

Well, It looks like I need an engine.

Compression was not good:


rear
75..........165
110.........160
0...........165
175.........155
front





Sorry for not numbering the cylinders but I'm not 100% sure which cylinders are which on this engine, I've already been bitten by that once on my other LR3, the misfire codes didn't match what the service manual said were the cylinder numbers.... but I don't remember what I figure out was what. I think it used the jaguar locations instead of what is in the manual.

 

[discostew]

That list of fault codes is pretty scary shit , looks like you have can network problems that shouldn't have anything to do with your lost compression . Maybe the thing lost a timing chain tensioner like the jags did early on . But I'm working on a car right now with a list of fault codes a little like yours .

 

[jafir]

That list of fault codes is pretty scary shit , looks like you have can network problems that shouldn't have anything to do with your lost compression . Maybe the thing lost a timing chain tensioner like the jags did early on . But I'm working on a car right now with a list of fault codes a little like yours .

After replacing the battery and charging it fully, the only code that was really persistent was the P0340... but it's not impossible that the TCCM is toast, causing can bus errors, because the old battery was pretty nasty.

 

[discostew]

Something let go in that rt bank timing chain . Get the valve cover off it and look around . If it lost plastic off a guide or tensioner it can jump time . Never really saw this in an LR3 yet but lots of the jags did it before they updated the tensioners . Looks like cyl#3 got hurt bad .