Ok so I'm experiencing some problems in my 96 xj. On cold starts it has problems starting. It takes 4-6 seconds while trying to crank it over while pumping the gas. After I get it started i can smell how rich it is. I put it in gear to drive it, it sputters, it won't drive over 2500 rpms, and it backfires repeatedly. When I come to a stop it idles lower then it should. To fix the problem temporarily I unplug an injector for 10 seconds then replug it and it drives perfect. On hot starts it cranks up fine but still does all the above. I've replace 2 injectors that the computer said was bad, replaced the PCM with a junk yard one, upstream o2 brand new, IAC brand new, tps brand new. I can't seem to figure it out. Please some one help!

 

This may seem krazy but have you replaced the plugs and wires and if you did make sure plug wires 3 and 4 arent crossed. P.S. with fuel injection there is no reason to pump the gas it only allows more air to enter the combustion chamber it does not pump more gas in.

 

I haven't tried the wires or plugs yet. And I pumped the throttle cause at start up all it was doing was dumping gas

 

When you replace the plugs be sure and look at them and see if they are black and on what cylinders.

 

I didnt realize that in that case it helps to allow more air flow but not gas.

 

You can pump the gas peddle all you want on a fuel injected car/truck and it does absolutly no good... it does not pump gas in....take to Autozone have them run a scan on it.. o2 is my guess....

 

The only good playing with the gas pedel will do for you is when you hold it to the floor then it will cut off 90% of the fuel given to the engine at start up.

 

Get the codes scanned, again. Sometimes the CEL won't come on, however the computer is still throwing a code.

 

same problem no luck yet....have tried a bunch of things

 

Codes are P201 - which is malfuntion or open circuit injector one, which i replaced so idk what thats about and P1391 - which idk what that is?

 

Did you ever find the problem?

 

P1391 is "Intermittent loss of Camshaft Position Sensor (CMP) or Crankshaft Position Sensor (CKP)" Try changing the first one, it's right inside the distributor should be easy enough. If that doesn't solve it then try changing the CPS both would make your engine run like crap and I think if one is going bad the computer might limit RPM's as a fail safe in case the engine will damage itself at high RPM's

 

and "open circuit" means that it doesn't have current going all the way through it, could mean an exposed, grounded wire for injector one

EDIT- LOL never mind he had these problems three months ago it's probably fixed!!