I have a 2000 xj and decided to do the injector swap. I purchased the Bosch 4 port injectors fit for that year and model. After swapping them out and the battery still disconnected, I touched the positive and negative wires together for 30 seconds, reconnected the battery, turned the key on, headlights on and off, then the key back off to reset the computer. When I started the engine, the check engine light came on. I know that the computer isn't used to the new injectors and is supposed to "learn" and reconfigure for them, but the engine is idling pretty rough and it doesn't want to turn over when I start it. It acts like it has a dead battery. Anyway, everything was working fine before, but I can't figure out why it is acting this way. I've only put about 15 miles on it since I changed the injectors. Anyone have some ideas?

 

What's the code?

 

You don't reset the thing unless it runs like total crap after the swap.

 

i don't have a reader. i'll check it tomorrow i guess. it acts like the timing is retarded pretty badly, and that would be the computer doing its thing, right?

 

Are you sure the battery isn't kaput?

 

unless it coincidentally died at the same time that i changed out the injectors

 

i just did the odometer code read, but it wouldn't give me a code. it counted 1 to 9, and that was it. afterwards i tried starting it, and it didn't give the trouble like before with starting, but still idles more like a 350 big block

 

You can only access OBD2 with a proper scan tool.

 

You mean you need to crank it awhile before it finally starts?

 

yeah, it would take a fair amount of cranks to get it to turn over, and it acted like the timing was retarded when it did crank. it started cranking better late last night, but the idle was still a big rough.

 

as an update, it fired right up this morning in a flash but blew a lot of smoke out. didn't smell like oil. it is now idling a little higher. i shut the engine off after a little while and then it took a lot of cranks to start it up again, again, a quick blast of smoke, and then idled much better. is this just the "learning" process for the computer?

 

The obd2 code was p0203 Injector #3 control circuit problem (open)

 

Your symptoms almost sound like one of the injectors is stuck partly open or is "leaking down". This is common in cleaned rebuilt injectors that are not reverse flushed out as the deposits that are loosened and get caught under the micro magnet in the tip and it can not close fully. After you turn the Jeep off since the injector doesn't close fully the pressure in the rail forces fuel to drip out of the injector into the combustion chamber until enough pressure is relieved for it to stop. When you go to start the Jeep the excess fuel in the chamber needs to burn off and can cause the spark plug to be damp etc and that is why sometimes you have the long cranking. It's possible it will clear up after a bit but if it doesn't you may need to pull the rail and see which injector could possibly be dripping

 

Any chance when you put the new injectors in you bent one of the pins on the plug?
Just a thought..

Ant...

 

took it for a cruise yesterday. keeping my fingers crossed, but it seems to have worked itself out. nice, steady idle and great fuel response now.