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Old 05-11-2010, 08:38 PM   #1
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95 2.5 check engine light

engine runs fine at times, then check engine light flashes and engine dies. I pull over and engine fires back up. any suggestions?

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Old 05-12-2010, 09:23 AM   #2
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More on 95 2.5 auto chk eng lite

Kinda new here. To both forum and this jeep. Have the Jeep in mechanic buddy's garage. Would like to add to post in hopes of getting some helpful advice. This is a summer project garboon, that was a gift from a friend who was tired of messing with it. Since I have inherited this beauty, I have been experiencing some unusual behaviors. Small engine seemed to run fine at first with just a slight stumble at idle. Drove it around beach, 4WD seemed fine. Drove more around town, no problem. Loaded it up and headed for highway, first 100 miles no problem, next 50 miles nothing but. First time problem occurred was at 55 mph. Check engine light started flashing like disco strobe, and engine cut out. I shifted (automatic) into neutral and coasted off highway. As long as I waited for engine light to come on and then go off, engine would fire up again. I would then continue driving and problem starting showing up at 35 mph. Same thing again. Could continue at 25mph for a couple of miles before cutting off again. At times after stalling, I would just shift to neutral, turn ignition back on, fire starter, and Bingo! Running again.
Somehow made it to destination. Occasionally after turning key on and waiting for engine lite to come on, fuel pump will pressurize system and relays in fuse block will chatter and then start up. Have replaced crank position sensor, looking at MAP sensor and PCM next.
Any thoughts or similar experiences would be greatly appreciated.
Thanx

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Old 05-12-2010, 03:11 PM   #3
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codes?
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(Sold)1994 Jeep Wrangler 2.5L, Bestop top
/w steel half door and slider windows
5 speed, 2.5" lift, 31" tires,rack lights
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Old 05-12-2010, 03:47 PM   #4
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Turn the key on and off three times quickly WITHOUT starting the engine! and then count the sequence of flashes from your gauge lights between the speedo and tach.
Get a pen and paper ready to write down the codes. You should get several codes (eg. 3 short flashes a pause then 2 short flashes = code 32) The flashes come quick and you need to be ready. Many will mean nothing, but write them all down. Then do a search on line for YJ code errors and it should get a vast amount of links for what each one means.
Repeat if you don't get all the codes the first time around.

Good luck and welcome to the Jeep world.
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Old 05-12-2010, 04:44 PM   #5
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my money is on your ecu.
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Old 05-12-2010, 09:27 PM   #6
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Man, this response is great! Codes are coming in 12. pcm disconnected within last 50key on dycles.. MAP sensor next..
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Old 05-12-2010, 09:32 PM   #7
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Thats our
next step.
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Old 05-12-2010, 09:34 PM   #8
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That is so correct! Thank you!
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Old 05-12-2010, 09:35 PM   #9
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Does this go to all ?
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Old 05-26-2010, 08:01 AM   #10
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Do you have any sources for this part? I have tried unsuccessfully to order one.
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Old 05-26-2010, 08:15 AM   #11
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Yeah, it said "disconnected" which could mean it is bad, but it could also mean the cable is loose. Double check all conections before spending any money just to be sure.

I also use auto computer exchange out of FL. website I've had really good luck with them, great service and great part. My ECM was bad and I changed it out about six months ago or so... been great ever since.
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Old 05-26-2010, 08:20 AM   #12
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I have power going into PCM, but none out . will check connections again. thanks
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Old 05-26-2010, 09:17 AM   #13
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just ordered part from Auto Computer Exchange. thanks
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Old 05-27-2010, 09:36 PM   #14
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I have replaced pcm, purchased through Auto Computer Exchange. After install, fuel system pressurised immediately, which previously was intermittent after key switched on. Engine idles very rough as if firing in wrong order. Can only get 2500 rpm when adding throttle. While idiling rpm's lower to just above stall, then rise to rough idle. When MAP sensor vacumn line pulled off, idle smoothes for 5-10 seconds then will stall out.
CODES receiving now:
12-Direct input to PCM dissconnected
33-open relay in A/C clutch relay ( I have no A/C system )
27-injector driver does not respond to control signal
27-"""""""""""""""""""""""""""""""""""""""""""""""""" """""
13-No difference recognized between engine MAP reading and the barometric pressure
37- DON'T know this code
55-Complete display

I checked this order of codes 4 times. Gonna try map sensor Fri.
Have tried adjusting distributor and checked spark in plugs.

Any ideas would be much appreciated.
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Old 05-28-2010, 01:03 PM   #15
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Sounds like you may have the wrong or defective ECM
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(Sold)1994 Jeep Wrangler 2.5L, Bestop top
/w steel half door and slider windows
5 speed, 2.5" lift, 31" tires,rack lights
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Old 05-28-2010, 01:28 PM   #16
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thats really wierd, make sure the big cable is seated all the way into it.

Also, are you on your original VIN#/Engine? I know they're supposed to match it via vin and have 'em pre-programed for your vehicle. Im surprised about the A/C error if they did match it.

Oh, and you mention "adjusting the distributer" hopefully with a timing light??? If not, barrow one. That could be the source of the trouble and it only takes a couple minutes to correct.
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Old 05-28-2010, 02:06 PM   #17
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Disregard the AC code if you don't have AC, it will always show up. If I'm not mistaken as I have not done it in awhile, the 12 code will show up whenever the ECM is disconnected or battery disconnected.
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(Sold)1994 Jeep Wrangler 2.5L, Bestop top
/w steel half door and slider windows
5 speed, 2.5" lift, 31" tires,rack lights
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Old 05-28-2010, 09:50 PM   #18
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Found new source of trouble today. While checking injectors, found gaps in intake manifold. Have new gaskets coming. Could be reason it runs better when MAP vacuum line disconnected.
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Old 05-28-2010, 09:52 PM   #19
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They told me VIN was not needed for 95 2.5. They have been very helpful and sent me replacement. Will let you know what happens. thabnks

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