by NowForThe5th on Sun Aug 15, 2021 11:22 am
Water that deep is bad, very bad. All the computers will have been covered, so no knowing how much damage there.
At least it will turn over, which means that damage isn't terminal, but doesn't mean it isn't serious.
Start by removing air intake tubes, clean and dry. Check air box for any signs of water. If it has a snorkel and this is all dry then you might be in less trouble, but no guarantees. Replace air filter.
Remove the spark plugs and turn the engine with the starter over to see if there's anything in the cylinders. Listen for strange knocking or grinding noises. If there are then best to take to a mechanic.
Drain the engine oil to see if any signs of water (milkiness). Refill.
Undo every electrical connection, spray with WD40, blow out and reseat. Connections of leads to spark plugs are particularly susceptible. Coil packs are up high and usually safe, but in water that deep the fan would have been pushing water everywhere. Connect and ground one spark plug to see if you have spark. If you do then proceed, if not then you need to track down the problem first.
If you have spark then refit plugs and leads and try to start. What happens here will kind of determine where you go next but if you have a friendly mechanic or a mate then it's probably time to give him a call.
ECU, BCM and other computers are up behind the dash and under centre console. Disconnect, clean and dry all connectors (and anything else). Most of the cases are sort of watertight, so don't go taking those apart yet. Fuse box will have been covered too.
From here it's hard to say. Was the water fresh and clean, or muddy? Goes without saying that you'll need to take out all the interior - seats, carpets/floor coverings etc and clean and dry. Same with doors.
They're an incredibly tough engine. I had one that decided to take a drink of water in a similar situation to yours (not as deep though) and it ran for a couple of thousand kms with bent conrods and all sorts of other internal engine damage. Cost me $5K to rebuild though. You might be lucky....
If work is so terrific, why do they have to pay us to do it?