Engine won't start?

The overheating has most probably blown the head gasket and this has resulted in low compression which would not allow the engine tio be started. Get a compression test to determine if the compression is within specs.

This guide will help us fix it

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please run down this guide and report back.

my car is super charged and I drove it through water. The car died and has not restarted since. I removed plugs and blew air down in cylinders but no water. oil looks milky though. checked all four coils and they are fine. replaced spark plugs. car tries to start but is only firing on two cylinders, left to right cylinders two and three only ones firing. no ignition module on this model. I moved one and four coils to two and three positions and two and three cylinders still only ones firing. removing air cleaner did not help. unplugged every wiring connection I could find and inspected, also sprayed with contact cleaner, please help thanks!

Milky oil suggests it ate some water. Not good, usually it means the engine needs major repair or replacement as water does not compress. First change the oil (use whatever cheap oil that matches the weight called for, you may be working on a dead engine so no reason to put $50.00 oil in it) but you also do not want to keep circulating water through it.
Stick a spark tester on one and four to see if they are actually generating a spark or not.

Then run a compression test and see what you have in each cylinder. You want all four to be within the same range (175psi in each would be good 160 will work) I am going to guess they will not be in spec. (hope I am wrong) If they are not run a leak down test and see where the leakage is.

As for the possible problems - bent con. rods, holed/cracked pistons, holed/cracked head, blown head gasket.
Good luck, post back with results of tests.

Did a compression test, looking at engine from under hood, left to right #1 150# #2 165#. #3 180. #4 120 it's really trying to start just won't. Havnt changed oil yet. Turns over good. Gonna check wire loom that connects to each coil this wknd. Noticed from trying to start only #1 cylinder fowling plug.

Hey Pat,

This might sound crazy but have you changed the air filter. If it is soaked with water the engine will have a hard time starting.

Please let us know what you find so it will help others.

Best, Ken

The air filter was pretty bad shape but we took it off weeks ago , didn't help. Did an ohm test on wire loom from coil packs to plastic connector not sure if anything is wrong with it or not. Really stumped any ideas would be great duly appreciated.

OK how about a simple test to see if it's fuel or spark related. Get a can of starting fluid and give it a couple sprays and see if it fires on all 4 that way. If it does you have a fuel problem. If not it's ignition related.

Also unplug the MAF and see if water damaged it.

#1 fouling could mean you have a seal leak in the blower.

One other ?. Is the check engine light on?

No check engine light, had all plugs out and turned over and vaporized gas blows up out of all cylinders.pretty sure it's ignition related.

My Cobalt shut down on us when the air intake became clogged.(Where the air filter is/long story) The car shut down and will not start now unless we prime it manually. It will crank but will not fire. Tried replacing the air sensor on top that is attached close to the filter box.That did not change any thing.

Start with the basics, and work your way up, Last tune up was? Wires plugs ALL filters? If all that is ok, check for a stuck EGR, then test fuel pump pressure, If it won't restart, determine what's missing, the engine needs three things to run, Spark at all plugs, gas to all cylinders, and compression in all cylinders, tho an engine may run lacking one in one cylinder, it won't run very well!
https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
Go here and checkout our video.
https://www.2carpros.com/car_repair_video/test_engine_ignition_system.htm
and this one!

If you are actually seeing gas then it's dumping a lot of fuel, flooding it out. Unplug the MAF and hold the throttle wide open and see if the clear flood mode lets it fire.

I will try that tonight and let u know . Fingers crossed!

I unhooked maf sensor turned over with gas pedal pressed. Still no start. I did turn key on and and checked voltage at the plug in for each coil pack. All 4 plugs tested 12.4 volts.but still no fire from 1 and 4 spark plugs I put a code reader on but no codes, I did have battery unhooked so probably why no codes.

Hey Pat,

It sound slike it might be a shorted coil either on 1 or 4 becasue they are related. Here is a wiring diagram to help fix the problem.

Try unplugging one or the other to see if the park will come back.

Please let us know happens so it will help others.

Best, Ken

I did move good coil2 and 3 to 1 and 4 spot& 1 and 4 to 2 and 3 spot. Still only got spark from 2 and 3. But I'll try what u said . Need all the help I can get! Thanks

Please run some tests and get back to us so we can continue helping you.

Best, Ken

after a radiator hose burst the car stall and cut off. after the car has cooled im unable to get it to restart when i turn the key to start the belts move but is just won't crank. what could the problem be

Hi
When hose blew was engine running fairly hot? Possible water got into some of the electronics. Check for spark at plugs. Also does it crank slower than normal?
Let me know
Thanks for dlonate

What about crank sensor? Could that be the issue?

yea it cranks really slow like the bateery is weak

That could be because if the sensor is weak it would only fire every other time which would make, sense. let's give it a try and let me know.

You could test the sensor if you have an oscilloscope.

If you can pull plugs crank any water come from plug holes?

As many crank sensors as I replace they need to make a tester just for them. O-scope works but not a cheap DIY item.

no water coming from plug hole...and it was running hot when it cut off

oky men its been a few days but i did put a new crank sensor in, car WILL start and idle slow for a couple seconds then spits and sputters then dies. the few seconds it is running i press on gas and it dies, will only idle couple seconds if i dont press on gas and die. but it now is kicking out a code, P2228 barametric pressure circuit low. MAP sensor possably? i went to a parts store they say i have a bent piston or cracked piston head. hope thats not the case. i think were getting close! i changed oil too. was milky brown in colar. deffanetly had water go through it

Did engine turn over faster? Check oil look normal?

Hey Pat,

Milky is not good, you may have a blown head gasket, can you remove the spark plugs and check their condition to see if any are discolored from the rest? also here is a guide to check for a blown head gasket.

https://www.2carpros.com/articles/head-gasket-blown-test

Please let us know what you find so it will help others.

Best, Ken

car was running roughly, sputtering, no power on acceleration so replaced the fuel filter and reinstalled the fuel pump fuses. tried to start car but won't turn over and engage and need to know why. Engine tries to turn over but ends up losing power and won't even turn over starter...just clicks and lights dim. Any assistance you could provide would be most helpful.

Sounds first like your battery is dead, I would put it back on a charge and see if it starts. Double check the fuse to make sure it's in all the way. Let's try this and go from there.

sean

Oil was milky from sucking water in from intake. Did compression test all 4 cylinders were 120 and higher.

Also turn your ignition to run without starting it. You should hear a light whine, this is your fuel pump, if you don't hear anything then there is no power going to your fuel pump. This is the pump priming the fuel lines.
Sean

Okay the compression seems okay, lets continue with to see if you missing spark or fuel pressure?

Here are some guides to help you

https://www.2carpros.com/articles/how-to-test-an-ignition-system

and

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator


Let me know what you find

Best, Ken

BAP sensor is a different part than MAP on that engine. BAP measures pressure outside the engine it's on the top left near the MAF sensor. MAP is inside manifold pressure and is stuck in the manifold farther back. From the setting criteria for that code I would replace the BAP sensor. You could check it for 5 volt and ground but I suspect those are OK.

Now that it does try to start, try unplugging the MAF and see if it sets a code, it should if the PCM is seeing it.

Thanks for ur help men! I will try this wknd.

Have you looked for water in your air box?

If u mean air intake yes filter hangs down behind headlight, that's wear all the water came from. I removed air intake pipe all the way to super charger to make sure it was all out.

Hey,

Did you ever get the problem fixed?

Best, Ken

I haven't had time with the holidays to work on it , but will this coming Friday. I will let you all know what I find. I am very appreciative of you men's help.
Thanks Pat

accessories come on, engine turns over but won't fully start at all

scan for codes check fuel pressure first.