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Old 04-07-2012, 09:12 AM   #1
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Exclamation Some one please help me!!!!!

1995 Jeep Wrangler
2.5l engine 5speed transmisson

my jeep is just getting worse and worse i really dont know whats going on it just like it jerks and slings you forward and sputters and lose power its been kinda alright where you can deal with but now its just outta control and im stumped
changed plugs wires
distr. and cap
fuel filter
its like you be driving fine then it just slings you forward and its basically makes me shift i dont know what the problm is???????? and this is my only vechile can some one please help me?????
i dont wanna lose my jeep!!!!!

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Old 04-07-2012, 09:26 AM   #2
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Sounds like a fuel/fuel line related problem. My first thought was fuel filter, but you already changed that. My next thought would be dirty fuel injectors or even bad gas. Dump some Lucas fuel treatment into the tank. It could also be your O2 sensor, IAC, MAP sensor or even a cracked exhaust manifold(you would hear noticeable ticking). Vacum leaks will also cause this behavior, but those are generally associated with high idle problems.The good news is that it's probably not a costly problem, you just have to find which part failed

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Old 04-07-2012, 11:56 AM   #3
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sorry to sound stupid but what are the IAC, MAP sensor? but i do have a high idl problem here and there but its weird i just took it out and drove it while it was warm and gave me little hesitation but this mourning it went crazy! but i tried the lucas injector clean already. but if you could explain exactly what the IAC and MAP sensors are i will def look into it asap and thanks again for the advice!!!
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Old 04-07-2012, 12:25 PM   #4
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Here's some info on them
MAP manifold absolute pressure
sensor
IAC Idle air control
http://www.jeepforum.com/forum/f9/cl...mmies-1114849/
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Old 04-07-2012, 03:02 PM   #5
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The fact you're having a high idle issues has greatly narrowed it down! Check all the vacum lines coming off your exhaust manifold to make sure they are all connected, give them all a good seating push. Look and listen for cracks in the exhaust manifold. The number one cause in Jeeps for a high idle is a vacum leak. This includes the exhaust manifold itself. Make sure the manifold bolts are tight and the gasket is good. It could possibly be your IAC($15 part), but I bet you it's a vacum leak in the exhaust manifold realm
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Old 04-07-2012, 03:12 PM   #6
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I had similar issues the past few weeks with my 95 yj. I took it to three mechanics and it turned out to be a couple of separate issues that all combined into what you are facing. The first issue was a couple of vacuum leaks which helped bring the idling down when those were fixed. The other issue was the fuel pump and distributor. After replacing those the Jeep ran better than ever. I know what your facing as my Jeep is my daily driver. Hope you get it narrowed down soon :-)
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Old 04-07-2012, 03:14 PM   #7
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sounds like either your Crank Position Sensor or your Throttle Position Sensor is going bad.....the CPS us located on the side of the bell housing and the TPS is located on the throttle body...both will cause the symptoms you're describing
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Old 04-07-2012, 07:09 PM   #8
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Check the catalytic convertor too.
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Old 04-11-2012, 12:44 AM   #9
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I too had a similar problem and found a solution. 1995 jeep wrangler would start and run perfectly until it reached operating temp(210). Once warm the jeep would hesitate and backfire.

I replaced fuel filter, plugs, wires, distibutor cap, rotor, and even the coil to no avail.

I tested the coolant temp sensor, MAT, MAP, Crankcase position sensor, o2, exhaust backpressure(cat), fuel pressure, and the cam sensor, everything appeared in specs.

I poured a plethora of gas treatments, cleaned throttle body with carb cleaner and checked for vacumm leaks with a propane source.

Tired cold and depressed I called the dealership and arranged for a diagnostic check that I could not afford. Still I felt that I had not checked enough. I pulled out an oooolllld ossilioscope and rechecked the CRank sensor..I found very minor aberrations and decided to replace it. $65 at autozone.

It worked. Several weekends shot but I'm a happy camper. I felt it important to share this as I got so much info from the site but no one posts the solution.

Please let us know how it's going ...success or failure
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Old 04-11-2012, 10:00 AM   #10
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i just wanna say thanks for the advice im going to try to replace the map sensor this week when i get paid and i guess i will take it one sensor at a time until the problems are solved but i looked up the sensors and they basically all describe the problems i am having i sure am glad i have other wrangler buddies that are there for me! haha but will ep yall updated
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Old 04-11-2012, 10:04 AM   #11
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Quote:
Originally Posted by Wrenched View Post
I too had a similar problem and found a solution. 1995 jeep wrangler would start and run perfectly until it reached operating temp(210). Once warm the jeep would hesitate and backfire.

I replaced fuel filter, plugs, wires, distibutor cap, rotor, and even the coil to no avail.

I tested the coolant temp sensor, MAT, MAP, Crankcase position sensor, o2, exhaust backpressure(cat), fuel pressure, and the cam sensor, everything appeared in specs.

I poured a plethora of gas treatments, cleaned throttle body with carb cleaner and checked for vacumm leaks with a propane source.

Tired cold and depressed I called the dealership and arranged for a diagnostic check that I could not afford. Still I felt that I had not checked enough. I pulled out an oooolllld ossilioscope and rechecked the CRank sensor..I found very minor aberrations and decided to replace it. $65 at autozone.

It worked. Several weekends shot but I'm a happy camper. I felt it important to share this as I got so much info from the site but no one posts the solution.

Please let us know how it's going ...success or failure


how did you test your sensors?
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Old 04-12-2012, 09:44 AM   #12
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I used a volt and ohm meter for most of the checks. I did have an oscilloscope for cam and crank.

You can purchase volt/ ohm or many car parts stores will let you borrow. Oreillys has a meter in their fuel pressure kit. Also YouTube offers a lot of diag check advice.
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Old 04-12-2012, 09:55 AM   #13
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If money is an issue you will go broke replacing parts. My 1995 is odb1 and did NOT throw a code. but the CRank sensor was going bad after warmup.

Is yours throwing codes? Is the chek engine light on?

Check out this video on YouTube:



Let me know if this helps
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Old 04-12-2012, 10:03 AM   #14
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Again many part stores /or good neighbors will let you borrow before free! Test twice buy once!
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Old 04-16-2012, 12:18 AM   #15
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Attempted to start my wrangler this morning and it would turn over but not start. I had no spark? Turns out during my testing (see above) when checking the CPS I pulled out wires from the camshaft position sensor plug. You could barely see the wires but apparently they were shorting out. Replaced the CPS and it runs great.

Lesson learned clean the plugs if greasy before attempting to separate. It was an expensive mistake.
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Old 04-24-2012, 10:24 AM   #16
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i have replaced the map sensor and the tps sensor and still no luck i even cleaned the iac and the whole throttle body im tempted to change the fuel pump but im really hope that solves my problem cause its starting to become a real pain im prob going to post a video of whats its doing here sometimes soon and maybe that will help describe my problem better.
but again thanks for the info!
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Old 04-25-2012, 11:55 PM   #17
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Before you change the fuel pump go to oreillys. They have a fuel pressure check gauge the will let you borrow for free. The gauge also has an ohm/voltmeter.
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Old 04-25-2012, 11:59 PM   #18
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Before you do anything else please answer the following,

Please list any codes that your odb1 is reporting.
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Old 04-26-2012, 12:18 AM   #19
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