NEED HELP!; 2001 Jeep Wrangler, 4.0, stalling, hiccupping, kangarooing

And it will be a crank position sensor.

Matt Macchiarolo did pass the time by typing:

Or ignition coil, shorted or broken sensor wire, loose battery connection, cracked spark plug, carbon trace or cracked cap/rotor/cop etc.

cop == coil on plug

Lots of things will cause bucking. Since it's a 2001 let the dealer plug it into a scantool and see what the computer says.

Leak detection pump? Why???

There is not supposed to be a vacuum hose going directly from the intake to the canister.

Do yourself (and your wife) a favor and let the dealer fix it while it's there, before you go broke throwing parts at it, and before your wife gets stranded somewhere.

cracked cap?

They don't use o-scopes anymore Bill!

:-)

here you go !

No dist cap in the 01. They went to coil-on-plug with the 2000 model year.

very natty 'burns :-)

Dave Milne, Scotland '91 Grand Wagoneer, '99 TJ

Matt Macchiarolo did pass the time by typing:

Yep, that's why I added cop. While unlikely, it is possible for that rail to get damaged. Especially if you arn't carefull taking it off or neglect the harness at the back. Just making the answer generic.

See above. :)

I'm jealous of your hair Bill!!

Hi Bill,

No I do not live in California. I'm no expert on smog test equipment, but I do know that the report you show is not done with an o-scope. Those reading are done with activated chemical sensors connected to the exhaust. The hook to the DMV (modem or internet) is to transmit the report data.

Obviously ignition and fuel injection diagnosis can be done with the o-scope (assuming the typical grease monkey can operate and interpret the equipment). Save that for the NASCAR mechanics.

:-)

JimG

I barely got the whole mullet faze....starting losing my hair before I actually got close to the long dreds!