black2000xj

2000 xj
4.0 straight six

fires right up, runs for about 3-5 seconds and then dies

fuel pump issues...

trying to help a friend out...so any help would be great

1998redxj

The computer could have some shorts in it. Disconect it. Open it up. 4 screws. One on each corner and the. Look for nething bad. Like black marks. Or fuel filter can be clogged. Or most of the spark plugs could be fouled out. Can be alot of things.

tjwalker

Only one way to find out if its a fuel delivery problem.

Test your way to a solution. If you see fuel pressure die as the engine dies, there is your "smoking gun".

Get a fuel pressure gauge (can be rented from many parts stores) and see where it's at. The spec for the 2000 is 49 psi, plus or minus 5 psi.

black2000xj

found out what it was

thanks guys

Fourtrax

What was it? CPS maybe!!

tjwalker

Well? We're waiting!

Kalali

If you expect help then have the courtesy to share the results. Pure common sense.

1998redxj

LOL! Mad much? Jeeze

black2000xj

sorry buddy, i didnt share the answer b/c my buddy found out what it was and i didnt know, i wasnt there to help him

so just for you i called him to find out what it was

He said it has something to do with a sim chip? I guess the key has some sort of chip in it.
When the jeep would start for the 3-5 seconds it had a key symbol on the dash with a line thru it, so he looked into that. I never seen it b/c i was under the hood, so i had no idea

I guess he has to get something reprogrammed? He is looking into it more today...but thats what he found out it was

fuel pressure was good 45 pounds
had fuel, spark, air.....coil was good.....thats why we were stumped

black2000xj

LOL...

salad

Ahhh immobilizer! Figured.

I appreciate your reponse guys, but please understand these forums are USELESS without feedback. If we never find out what worked to solve a problem then this is just an online guessing game instead of assistance in diagnosing issues.

black2000xj

if thats what its called....he just said he had to get something reprogrammed
never heard of this before so we were both stumped

and sorry i didnt reply, he just texted me and said he figured it out

I just wrote that down right away so people werent wasting time commenting on something that is fixed

i did get back with him early this morning and thats when he told me

my apologies....I didnt mean to cut anybody off.

Sorry C.F.
Scott