Can only start jeep when gas pedal is to the floor

SOURCE: my jeep will be running

Hi,

This could be caused by so many things...ranging from Ignition and/or fuel, exhaust, Bad Throttle Position Sensor, Oxygen sensor, catalytic converter, clogged injectors...the list goes on.

As your vehicle's engine & emission systems are monitored by your onboard diagnostic computer, I strongly recommend you take your vehicle to the nearest Jeep Service dealership, to have the computer scanned for fault codes.

This won't take long to do, and your vehicle's computer will identify the faulty system and/or components immediately.

NB: do not waste money by taking it to your local mechanic, as they may not have the appropriate scanning equipment for correct diagnosis. Scanning will take less than 30mins to do.

Hope this helps...

Georgia B

• 1342 Answers
• Posted on Jul 22, 2008

SOURCE: 1992 Jeep Cherokee starting problems

Found this in a Yahoo post:

Check to see if you are losing prime pressure from fuel pump.
ASD relay kicks for a few seconds when ignition is turned on and fuel pump primes up pressure to injectors. If you have a leak down from the pump this few seconds is not enough to get enough pressure to build. When engine is turning over, ASD relay latches on and fuel pump runs therefor building enough pressure to injectors on the second start. The fuel rail has a port to hook up fuel pressure tester to test this issue. If this is the issue, check valve in pump is failing.
GOOD LUCK and happy motoring

SOURCE: 87 jeep cherokee 4.0

Possible Fuel Line Leak Or Bad Fuel Pump
Lets Gas Presure Diminish Over a Long Period !!

Could Also Be Bad Pump or Pickup Unit...

SOURCE: I have a jeep grand cherokee and it does not start

no, don't touch the gas, you'll flood it. Just turn it over normally.

SOURCE: 1996 jeep cherokee 4.0 engine.

I had the same problem and it was the throttle position sensor. have you replaced this? Very easy and solved everything.