2003 HSE Disco will not stay running
 

2003 Discovery 2
4.6 V8 with 149,xxx miles

I purchased it not running for $1K, so not looking for sympathy just a little guidance :). The truck currently has the 3 amigos + CEL warning lights. A review of the codes using a Innova 3130 scanner I receive P0300, P0302, P0305 and P0307. If I clear the codes, the CEL remains on. To clear the CEL I remove the battery and short the + pos and - neg battery leads together. Once this clears the CEL, I can start he truck. It runs seemingly fine.... for ~10 min then shuts off with the random misfire and various P030x codes. What I have done so far is this:

• Replaced the CPS
• Replaced all 4 O2 sensors (Bosh)
• Replaced all 8 spark plugs (Bosh)

I have in my possession:

• New Coil packs
• New plug wires
• gaskets required to remove / replaced the intake manifold to gain access to the coil packs.

My question is, what scanner / code reader should I purchase as I am guessing the Innova is not reading some LR specific codes as the CEL remains on after a reset. I see recommendations for iCarsoft, Hawkeye and NT510. Is there a clear winner i.e. the best return for the investment?

Any other or better recommendations to perform either before I replace the coils and wires or during replacement in order to get this truck running?

Thanks,

Troy

Mr. Best4x4,
Thank you for the recommendations. I expect the programming key-fob function will be something I need as I only have 1 key currently so the more advanced set will be what I am leaning towards. I will look into the Nanocom and compare it to the Hawkeye. Thanks.

Since you have the parts for replacement, try to replace them first and see if it improves the condition. Seems like you have the right parts to make it right.

Here is what the Innova "predictive fix" suggests, I will work up this list beyond what I already have from least expensive to most, given it could be any of them.:

1. Inspect for Faulty Vacuum Hose(s) at Air Injection System (AIR) and Repair as Necessary
2. Replace Ignition Coil(s) and Spark Plug(s)
3. Replace Fuel Injector(s)
4. Replace Fuel Filler Tube
5. Replace Oxygen Sensor(s) (O2S)
6. Replace Mass Air Flow (MAF) Sensor
7. Replace Evaporative Emissions (EVAP) Purge Control Valve
8. Replace Spark Plug Wires and Spark Plugs

your misfire codes indicate bad coil packs, it likely is running until it gets up to operating temperature and then the bad coil packs are failing on it. I would recommend replacing the coil packs and buy one of the Amazon Bluetooth Elm code readers and watch your oxygen sensor charts after she's warm

It will run for ~7-10 min then die and will not start. To get it to start, I have to remove the battery and short the Pos & Neg leads together for some period of time.

My Innova scanner has a live data function. I can view the O2 sensors output in both digial read out as well as graphing form. I will be replacing the coil packs soon. Thanks