Engine wont start
#1
Newbie
Thread Starter
Engine wont start
i need help from you guys. my 94 cherokee xj wont start.i already check all the sensor, the ignition coil,ignition cable,spark pug and the condition are good.i can crank it but it wont start. i'm really dissapointed right now.help me please!!!!!!!!!!!!!
#3
CF Veteran
Join Date: Nov 2011
Location: Montpelier, Ohio
Posts: 2,401
Likes: 0
Received 0 Likes
on
0 Posts
Year: 92
Engine: 4.0
Have u checked/cleaned all ground straps? They are VERY important. Do u have a big fat spark? Do all your gauges work properly when u hit the key?
#4
Senior Member
Join Date: Jul 2009
Location: San Diego, CA
Posts: 739
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1996
Model: Cherokee
Engine: 4.0 HO
Do you have good fuel pressure? Does the enginge crank, but never catch? I don't know about your year model, but check your autoshutdown fuse. The ASD fuse is located in the fuse box in the engine bay. Also check the ASD relay while you're at it.
#5
CF Veteran
Join Date: Nov 2011
Location: Montpelier, Ohio
Posts: 2,401
Likes: 0
Received 0 Likes
on
0 Posts
Year: 92
Engine: 4.0
I believe the asd kills all spark and injector pulse. So if you have any spark and fuel on the plugs it may not be the asd. But an easy way to check is to just stick another spare one in there. Its always good to have a spare relay around, they aren't that expensive. Sometimes you can pull it out and it will click, then you know it was probably tripped.
#6
The Auto Shut Down fuse & relay are on '91 and up Chrysler systems. The ASD system sends B+ to the ECM, Coil, injectors, fuel pump, etc...
#7
Senior Member
Join Date: Jul 2009
Location: San Diego, CA
Posts: 739
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1996
Model: Cherokee
Engine: 4.0 HO
When this happened to me (out in the middle of the desert), I got good fuel pressure, but I don't think I had spark. One of the guys I was with was a BMW mechanic and he tried convincing me the computer was shot and needed replacing. (Typical) Ended up being the ASD fuse that was getting tripped because of a short in the front O2 sensor wiring. You can check that, too, btw. Runs from the fuel rail area down to the O2 sensor. My wire insulation was brittle and flaking off; the wires were contacting each other and causing the ASD fuse to trip. A battlefield repair using duct tape worked to get me out of the desert, but in time, it didn't last. I had to replace the O2 wire harness. If you check, you HAVE to check under the wire loom. My destroyed wire insulation was hidden quite nicely under the loom.
Trending Topics
#8
Newbie
Thread Starter
thank you guys,i'll try to check my ASD fuse first. forgot to tell when i crank the engine there is engine check light appear,do it say that i need to replace my ECU?.my fuel pressure is good.
Last edited by xjowner; 12-02-2011 at 01:03 AM.
#9
Senior Member
Join Date: Jul 2009
Location: San Diego, CA
Posts: 739
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1996
Model: Cherokee
Engine: 4.0 HO
Checking your ASD fuse, relay, grounds, spark, O2 sensors is WAY cheaper than replacing your ECU. If I'm not mistaken, I think the check engine light is primarily an emissions system thing. I'm not so sure it has anything to do with your Jeep not starting.
#10
Newbie
Thread Starter
i have checked all the fuses and they are ok..i get from the internet how to check the engine by turning the key 3 times and wait for the signal..i got
25**
A shorted condition detected in one or more of the idle air control motor circuits.
can you guys teach me how to check it which cable has shorted?
A shorted condition detected in one or more of the idle air control motor circuits.
#11
CF Veteran
Join Date: Nov 2010
Location: In the middle of Minnesota!
Posts: 5,805
Received 99 Likes
on
88 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
The idle air control is located on the throttle body. It is possible that the IAC itself is shorted. They aren't particularly expensive and if you don't find a problem with the wiring (examine closely), I'd replace the IAC.
Thread
Thread Starter
Forum
Replies
Last Post
Gtrsrlly
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
5
08-25-2015 11:50 AM
smithj
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
0
08-23-2015 12:14 PM
hkb
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
4
08-21-2015 05:48 AM
CCKen
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
3
08-20-2015 08:07 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)