Engine turns over but will not start - 1999 GMC Suburban

You destroyed your engine. It will not start. What is turning most likely is the starter

Started knocking and shut off ? Now will not start?
That sounds bad - check fluids - engine oil and coolant - those three symptoms can indicate overheating (either by lack of coolant or engine oil).
Did either fluid get low AND does the engine oil look contaminated - milky colored and way overful.
Not Start? Does it turn the engine and just not fire up running?
Or does the engine not turn over at all?
If the engine is siezed - you can tell by the electrical power needed to crank the engine - turn on the lights and try to crank the engine - if all you hear from the starter is a click and all the lights dim - that means a lot of power is needed like:
1. the battery doesn't have enough power - jump start to verify
2. or it requires more power to turn the engine than the battery can provide - engine siezed - try turning the engine by hand with socket/wrench to verify.
I hope your engine is not siezed - if so - hope you still have warranty coverage on the powertrain.
Please let me know what you find and if this helps?

Vehicle is in limp-in mode. You must be resetting when you turn it off.

two things to check when it is warm, check fuel pressure at the rail and test for spark.

Hi there:

When the light comes on, one or more diagnostic trouble codes (DTC) are stored in the engine control module. These DTCs remain even if the light goes out. To address a Check Engine Light problem, the DTCs are retrieved and the appropriate troubleshooting information is followed in order to determine the problem.


Just scanned the computer and send us code number find it.

Hope helps.

common problem is turning car off with engine not reaching normal operating temp and floods engine. try this. DE-CHOKING PROCEDURE WHEN ENGINE CRANKS BUT DOES NOT START
If the engine does not start, try the following procedure to start the engine using the de-choke mode.
Failure to do so may aggravate the no start condition.
1. Depress and hold the accelerator pedal to the floor and crank the engine for 7-8 seconds. (This will clean out any unburned fuel from the combustion chamber)
2. Release the ignition key to stop cranking.
3. Release the accelerator pedal and start the engine. If the engine starts while performing Step 1 the engine will rev up. Immediately release the ignition key to stop cranking and remove your foot from the accelerator pedal.
^ Do not keep holding the ignition switch in the START position over 10 seconds if the engine does not start. This may result in a weakened or dead battery.
^ Avoid racing the engine or sudden take off right after starting the engine.
^ If the engine still fails to start following the De-choking procedure, have your vehicle inspected by your Mazda Dealer.

for your info there is a recall for this problem. contact mazda.

okay,think of it this way,you tried starting,engine turned slowly,no start.....then you charged battery,engine wont turn over(although accessories work)WHY WAS THE BATTERY DEAD TO START WITH.Try a jump start(another battery)if it starts then you know what im going to say.....

Hi.. I had a very similar problem recoverrd to are workshop by the A.A around a month ago.
Exactly the same problem (left to cool started.? Once worm or hot engine just turning over ?)
Afdter reading all known folts and finding nothing to do with what I'd wanted. It took some time ?
Cutting it sort if found when I replaced a intermittent faulty fuel relay and run till engine hot (untill cooling fan cut in) Then turned off engine .. on turning key to see if this had cured my problem?
The engine started frist turn of key after repeating this a number of times .. this car was now starting fine (whether hot or cold)
Problem fixed..
Hopefully this will be of some help to yourselves
Hears hopping
Don Milward Premier Garages

Suggestion, don;t try and start the car with the gas pedal pushed to the floor. Asking for trouble in the future.

Could be a fuel pump, clogged fuel filter.

Check engine light on? If so, Have the code read/scanned at your mechanic, or your local auto parts superstore.

1. hold gas pedal to floor while trying to start. do not pump pedal.
2. holding pedal to floor is how you start a flooded f.i. engine