We bought a downed LR4 this week that was throwing error codes the owner was tired of chasing. My wife has a Series 3, I have a Disco 2, so we figured a Disco4 would be a good family hauler. I know about the timing chain issues but want to trouble shoot before going ahead with a 16hr task. If anyone has any trouble shooting recommendations before I call it what it is and begin timing chain replacement, please do let me know.

Running OBDwiz report shows:
ECM Calibration ID: CH22-14C204-YAC
The control module voltage (11.76V)
Fuel pressure is 46.41 psi
P0300: Random/Multiple Cylinder Misfire Detected
P0302, P0303, P0304, P0306: Cylinder 2, 3, 4, and 6 Misfire Detected
P0316: Engine Misfire Detected on Startup (First 1000 Revolutions)
P0016, P0019: Crankshaft Position - Camshaft Position Correlation (likely Bank 1 and Bank 2)

OBDwiz has a command line interface option that permits direct interaction with the computers. I ran the following:
Command: 010E (Ignition Timing Advance, Mode $01)
Response: 7E803410E95

7E8: ECU response
34: (possibly truncated).
10E: Echo of PID.
95: Raw hex value (149 in decimal).

Conversion: Timing advance = A - 128, where A = 149. Result: 149 - 128 = 21 degrees (lt should be negative or 0 with engine OFF).

Perhaps my understanding of the response is wrong. I am going to check again tomorrow but if it is actually 21 degrees then the chain is certainly unhealthy. Questions arise though because of findings like the attached picture of a couple partially connected clips and this random just hanging out there... what is it anyway if anyone knows.

Hi

That connector looks like a transport connector that’s isn’t used anymore , I just taped mine up and put it out the way

I wonder as the chain is bad if it’s jumped a cog, voltage looks low but best to double check what they should get ,maybe there’s a bad earth cable causing it to show a lower reading unless the main battery is low , that should be a minimum of 12.6 Vdc with the engine off

Hope that helps

Plse let us know how u get on and would be really nice if u could share some pics plse , thks

A code P0300 may mean that one or more of the following has happened: Faulty spark plugs or wires Faulty coil (pack) Faulty oxygen sensor(s) Faulty fuel injector(s) Burned exhaust valve Faulty catalytic converter(s) Stuck/blocked/leaking EGR valve / passages Faulty camshaft position sensor Defective computer

Read more at: https://www.obd-codes.com/p0300
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P0016, P0019: Crankshaft Position - Camshaft Position Correlation (likely Bank 1 and Bank 2)

That's generally a pointer to the timing chain skipped. Its especially common on those early ones.

I'd be vaery waring of running it... one more "inicident" and the repair bill could double... treble... or more!