My jeep will only go 15mph? -
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Unread 07-17-2010, 01:35 AM   #1
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2002 TJ Wrangler 
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Location: seguin, texas
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My jeep will only go 15mph?

a week ago I replaced the radiator, after that I can turn the jeep on, but you can step on the gas, but it does not move, just revs up. It also will only start on the third try of starting it. anyone have any answers please
while trying yo start it throws out the code P230

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Unread 07-17-2010, 08:40 AM   #2
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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..
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Unread 07-17-2010, 08:05 PM   #3
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No, it does not redline-and yes it does move, but only when you push accelerator to the floor. It does go into gear, and the radiator was changed due to having a leak in top and bottom. the only issue that was present before was the starting issue - it would turn over on the second attempt. I never messed with any electrical parts during the process-and there is an engine wine coming thru the speakers too. when I try to start it, it sounds like no spark, have not heard the clicking yet. Ant today when I went out there, the turn sig and everything on the dash does not light up. when I depress the brake, it flashes check guages and the dome light turns on
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Unread 07-17-2010, 08:20 PM   #4
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Unread 07-17-2010, 08:28 PM   #5
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Your profile says you have an automatic transmission. Did you check the transmission fluid after you changed the radiator? The radiator has a cooler built into it. When you change the radiator, you lost some of the oil due to removing the lines from the radiator and fluid still in the cooler. As for as the starting, maybe some one else will know.
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Unread 07-18-2010, 09:21 AM   #6
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I had a whining through my speakers in an old s10 I used to have. Turned out to be a bad ground
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Unread 07-18-2010, 09:33 AM   #7
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Let the Jeep sit for a while, then turn the key to the ON position, just electrical turns on, you should hear the fuel pump priming. Once the fuel pump turns stops priming, turn the key off and repeat the priming a few times. Then after a copule times try firing up the engine. If it fires up no problem its the fuel pump, if not it's something else.
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electrical , radiator , rpms , turn over
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