I have 1998 suburban and I cannot get the car to run

You might have spun a bearing or something I had this happen on my 95 and my most likely thought is the engine is in limp mode

CHECK WITH CODE SCANNER FOR FAULT CODE

The diagram you requested is for 1998 Suburban 7.4L is below. Thank you for using Fixya!
Greg


1998 Chev Suburban 7.4

my suburban does the same thing have you got the problem fix

Its called the fuel pump cylinoide which is attached to the fuel pump. Unless the fuel pump is bad, you got an expensive part to buy around $2500 or the cylinoide is $900 whichever is broken. This is a know issue for GMC deisel suburbans 6.5.

Check the primary and secondary resistance of your coil also recheck the resistance of the plug wires

If the compressor will run turn it on and let it run for a few minutes, the line that gets cold is the low pressure side, this is usually the one closest to the firewall. The reason that they are 6 inches apart is that they are on opposite sides of the orfice tube, hence one is high pressure and one is low.

there is water in the fuel, there should be a fuel water seperator in the engine compartment, look in your owners manual and it should tell you the steps to drain the water from it, it should take a few minutes

Sounds like a good place to start would be a new set of plug wires, distributor cap, rotor, depending on what ignition system you have, plugs too, if not done recently.

havent a clue??? do a basic check ,like does it have enough fuel ?? did leaving it running ,run it out of petrol .power to the pump?? does it have a spark??