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Re: engine start problems
The problem could be the starter,battery, battery cables, or alternator. the clicking could most likely be the starter going bad if not bad already or the battery weak or bad battery cables, if you have good power to everything else radio headlamps and heater the i would start by replacing starterlet me know what you find.
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What kind of remote start module ? Seams to me if the vehicle starts with remote start disconnected then doesn't start with it connectected it's a problem with the remote start electronics . Is it aftermarket junk ?
Given that you have replaced the entire cranking system except the battery cables... I would put money on what Christopher said. You can do a voltage drop test to prove it if you have a DVOM. When it gets that cold it requires a lot of extra amperage to turn the starter. if you have a bad cable (corrosion inside the insulation is not un common) it can't pass the necessary amperage. Either cable of both can cause this problem. If you're in on of those places where it is all of a sudden like the North pole but doesn't normaly get that cold you may have had this problem all the while but didn't know it.
It could be your neutral safety switch. Try putting it in neutral and turning key. If it makes a difference you'll need to have the switch changed. Could also be a loose, broken or corrided wire on starter
So what it only does it in park or neutral ! The vehicle starting circuit is only suppose to let it start in park or neutal . Park neutral safety switch won't allow B+ voltage to S terminal on the starter solenoid unless the vehicle is in park or neutral . It's probably the starter relay contacts stuck closed . You really should learn how it works before guessing as to the problem . Plus learn automotive electrical testing ! The ignition switch when turned to the start position send's a voltage signal to the PCM - engine computer .The PCM will energize the starter relay to crank the engine . PCM / ABS 10amp fuse in the I/P fuse box supply's B+ voltage to the park / neutral safety switch . When in park or neutral the B+ voltage goes through the control side of the relay to the PCM which will supply a ground to energize the starter relay .
Make sure your battery is fully charged. If the battery is fully charged make sure your starter is engaging, or trying to start the van. If it just clicks or sounds like it is spinning really fast have your starter checked. You can remove it and most auto parts stores will check it for free or mechanic shops might charge a small fee to do it. If the starter is trying to turn over the van and it won't crank you may have bigger problems. If the starter won't turn over the engine you can check it yourself by trying to turn over ther engine by hand. You will need to remove the spark plugs and turn it by putting a socket and ratchet on the harmonic balancer retaining nut and turning that. If the engine won't turn or is very difficult to turn with the spark plugs removed then you could have internal damage. You'll have to decide at that point wether it's something you want to do or get professional help. Gl
Try using higher octane fuel or octane boost in the winter this is a common problem on the dodge V-8s,after about 60,000 miles. However yours sounds like fuel line freeze up V-8s experience moisture in the fuel lines. Higher octane should help you may also wish to change your fuel filter, and run a fuel line cleaner through your van Seafoam is a good one.