2000 XJ Starting Problems

Clean your throttle position sensor connector.

DRRanchTx did pass the time by typing:

Like Matt said, clean the TPS connectors

clean the throttle body idle air passage. Holding your foot down on a fuel injected vehicle is not the same as a carb. A foot-down start tells the computer something is wrong with the sensor circuit and puts the computer into a limp mode while it tries to start the engine. Since it isn't keeping on running there is something wrong and should be a trouble code set.

Pull the codes.

ignition on-off-on-off-on then record what comes up on the odometer. Yours should send codes there.

Sometimes holding the gas pedal down on a Cherokee gives the body an electrical ground....

I would be checking the wire mesh strap from the head to the firewall on it also.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 (More Off Road album links at bottom of the view page)

thnks for the reply....do I need to remove the senser from the body of the throttle or just where the plug meets the unit and spray there

hnks for the reply....do I need to remove the senser from the body of the throttle or just where the plug meets the unit and spray there

The electrical plug is usually all you need to clean on the TPS.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail >

DRRanchTx did pass the time by typing:

Get some contact cleaner that is safe for plastic. Before you spray the contacts, put some paper towel around and use a bit of cardboard to keep any of the contact cleaner off of the paint. Contact cleaner is very good paint remover. It's also a very good idea to wear eye protection.

Disconnect the plug, spray the contacts, work them a bit with a toothpick, spray again, let dry, then put a bit of dilectric grease (sparkplug grease) in the socket and on the gasket. Then reassemble.

If your moderatly skilled with electronics and have a digital volt meter you can test the TPS sensor. There are three leads. one is ground, one is voltage, and the other varies as you move the throttle body.

Basically: Turn the ignition on but do not start the jeep. back-probe the connector and find the ground and +5v (should be the outside two wires) If there isn't 5v there then you might have a break in the harness or just not a good contact with the wire. Now measure the center wire against the ground.

Throttle butterfly Voltage CLOSED >200 mV OPEN

thanks to all...cleaned the contacts as well as the gummy throttle body.....will do this to my 2001 Grand w/4.0 engine as well...thanks again for money saved and this wonderful line of jeep folks...have a safe 4th

Mindy did pass the time by typing:

Glad to know that helped.

Have a safe 4th as well.