Non start I changed timing belt and after that I couldn't start the engine.I checked the timing belt,it is okey

Failed Transaxle--- has to be rebuilt

The differential in it is whinning & also
maybe the torque converter

Fluid Level okey?

Engine Howl-no idea

Alternator Bracket---take it off & weld (braze) on a nut,
where the threads are gone

1999 vehicle---15 years old or more

Just maybe time to put it to sleep & move on
to a non van type & much safer vehicle,anything
but a van

Remove the pan drain the fluid,refill
Drive a day or two & change it again
No it is not okey with any motor oil in there,
you got big problems.
If you change it 3 times & it still shifts okey
you got lucky
My concern is that the motor oil won't go thru
any of the solenoids

You can't have ANY Exhaust leaks BEFORE the
Converter or you won't get rid of the PO174 or have control
of injector pulse or fuel trim
You have a timing chain -no belt
Better use 5W-20 Full Syn Oil if want the
VVT Cam Actuators to last
All those codes are ignition cylinder misfires
All you have done so far is preventative maintenance,
what some call a tune-up which by the way ended some
25 years ago or more.
You have done nothing to diagnose the codes apparently
& find the cause of the fault codes
You have misfire on both banks no matter a V6 or V8
Easy to figure out,need a repair shop or study those
codes on the internet.
Check for vacuum hose leaks EGR etc
Forget the PO300 & 316 they are of no use to you
Do not use it until resolved as you don't know if you
have a Class A or B misfire that could damage the
converter
O2 Sensors ( front ones) get replaced at 100,000 miles
You need a good battery- the motorcraft are okey & made
by johnson controls, but only last about 4 or 5 years.

Greetings, I read your question and I think Reliable-Store can help you in this. Here's the site link. Complete 2001 Mitsubishi Galant Workshop Repair Service Manual

no your timming belt broke!!! now if you have a interference engine you will need a new car!!!
the only way to know is if you search your year make and engine size of your car..
you better hope its a non interference engine .. than just change the belt.. good luck. this is a basic timming belt photo .

Check timing belt first , check starter also .

From a(Retired Chrysler Tech) If prior to changing the T-stat & belts you were experincing a no start,Then afterward it started & ran fine until you again worked in the same area as before, The first thing I would do is to check any and all electrical "wiring" and or sensors & switches in that same area, If your vehicle is equiped with a crankshaft sensor it may be at the front of the engine in close proximity to the harmonic balancer,"crankshaft pully"& the wiring my be routed as to be easily moved while working in the belt area..pay close attention to the condition of the wiring. any wires that are exposed(bare) must be repaired or replaced. check for loose plugs at sensors. Be meticulous in your search, the smallest thing will create a no start in this type of set up.

My PT did that when my timing belt broke. It cost $500.00 to replace it. If it is broken, be ready to have some motor work done. I had to have to values replaced at a cost of $900.00. If your timing belt is not broken then check the alternator and battery. I was riding down the road and my PT shut all the way down and would not start. I had to leave it beside the road. It was my alternator. It gave me no warning.

Wiring issue,,, check all the grounds

Did you get it timed correctly? You don't just replace them like a fan belt, there is a procedure and marks that you line up. Your engine may be a non-interference or interference which means that if your timing belt breaks your pistons may hit your valves and cause major engine damage. Non-interference means that when the belt breaks it won't interfere and cause damage. Interference means that it will. I don't know what engine you have in your car but if you call a dealer and tell them what engine you have in your car they should be able to tell you if it is a non-interference or interference engine.