Please be more specific. You have at least two issues
If your jeep goes 15mph then it is moving.
Revs up to redline?
We have to assume its in gear right.
What prompted the radiator change?
Were any of the starting issues present before the radiator change?
Did you need to remove any wires/connectors?
Disconnect the battery? Wierd stuff happens when there is a bad connection.
When it wont start on the first try does it click (Bad electrical connection) or turn over and not run? (No fuel, spark, computer/sensor issues)
Not trying to be difficult but its very difficult to diagnose a machine run by a computer, messed with by the owner over the internet.
CODE: P0230 Transfer Pump (Lift Pump) Circuit Out of Range Problem detected in fuel transfer pump circuits
Thats an odd code. Its your fuel pump, electrically related. Although they do go bad it seems to be uncommon for the pump itself to go out. Not starting without multiple tries could mean its losing pressure when its off.
Check fuses and relays first. (probably not since it does eventually run)
Check fuel line pressure w/o turning it on. Depress the schrader valve on the fuel line to insure you actually have pressure.(Fuel should squirt out at high pressure have a rag under/around it.) If not maybe bad pump, leak in line, bad check valve.
Next you turn the key ON, NOT start, you should hear the fuel pump cycle on and pressurize the system.
Check for pressure again.
Now start it. If it starts we may again be at the losing pressure issue. (I have had a similar problem)
You can get more technical and get a pressure guage. but were not there yet.
Jeep took another piece of my finger today...
Last edited by Piratejonh; 07-17-2010 at 08:57 AM.