post #1 of Old 12-22-2012, 08:15 PM Thread Starter
Renegade85
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1989 YJ Wrangler 
 
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At a loss need help please yj cutting out

Alright I've got a small issue, I've changed the cap ,rotor, plugs, wires, fuel filter, cut the cat out, changed the coil, cleaned the injector, drained the fuel put fresh gas in, new oil and filter and air filter, heater core, and pvc valve. still cutting out. runs like a top until it gets to operating temp and then starts cutting out push in the clutch revs up just fine with a little miss, shut it down, and after I let it chill out it runs great until it gets back up to temp then i'm right back where I started any help would be greatly appreciated thanks... By the way its an 89 yj 2.5

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post #2 of Old 12-22-2012, 09:06 PM
Nickabis
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1990 YJ Wrangler 
 
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Hate to see parts being thrown at it but when I had a cutting out issue as well, I also replaced the map sensor and the crank position sensor. I felt it was time after 20years. I also fixed my vacuum hose leak, exhaust leak, and rebuilt my throttle body.

After all that, it hasn't had the issue again. Just somethings to think about.
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post #3 of Old 12-22-2012, 10:19 PM
sxi4evr
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throttle position sensor and/or crank position sensor? gotta love electrical bs

Check out my YJ!!!! http://www.jeepforum.com/forum/f22/first-timer-yj-build-1373716/
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post #4 of Old 12-23-2012, 07:48 AM
ROTTEN
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My vote crank sensor. Classic symptoms

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post #5 of Old 12-23-2012, 10:11 AM
youngjeepr
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It's your o2 sensor.. The coolant temp sensor regulates how much fuel is delivered until it gets close to operating temp then the o2 sensor takes over.. When they go bad they can make the ECM deliver to much fuel causing the engine to almost flood and have no power or it can starve the motor of fuel and also have no power...

88 YJ- 4.7l stroker, AW4, SOA, 8.8, hp D30 powertrax no slip,3" front stretch with waggy springs, stock replacement springs in the rear, 35/12.5 r15 goodyear kevlars

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post #6 of Old 12-23-2012, 10:18 AM Thread Starter
Renegade85
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Thanks for your replies guys... usually I can figure the problem out within an hour or so but this has been a pain, so the crank and or throttle sensor won't start acting up till after it warms up, cause it runs fine until then.
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post #7 of Old 12-23-2012, 10:22 AM Thread Starter
Renegade85
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So if I unplug the 02 will I see a difference or will it act the same.
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post #8 of Old 12-23-2012, 10:27 AM
youngjeepr
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Quote:
Originally Posted by Renegade85
So if I unplug the 02 will I see a difference or will it act the same.
Yes it should make a difference when it is unplugged... Some people say it doesn't but every time I've tried it it does... And according to the way OBD1 is supposed to work it will resort to a factory default setting for the sensor that is unplugged.

88 YJ- 4.7l stroker, AW4, SOA, 8.8, hp D30 powertrax no slip,3" front stretch with waggy springs, stock replacement springs in the rear, 35/12.5 r15 goodyear kevlars

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post #9 of Old 12-23-2012, 10:28 AM
youngjeepr
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Quote:
Originally Posted by Renegade85
Thanks for your replies guys... usually I can figure the problem out within an hour or so but this has been a pain, so the crank and or throttle sensor won't start acting up till after it warms up, cause it runs fine until then.
No these sensors should act the same no matter what the engine temp is

88 YJ- 4.7l stroker, AW4, SOA, 8.8, hp D30 powertrax no slip,3" front stretch with waggy springs, stock replacement springs in the rear, 35/12.5 r15 goodyear kevlars

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post #10 of Old 12-23-2012, 10:59 AM Thread Starter
Renegade85
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That's what I was told too this is just getting aggravating well I unplugged the 02 and its still acting the same, I've cut the cat out so putting in a new o2 would be pointless wouldn't it and it was doing this before I cut it out
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post #11 of Old 12-23-2012, 11:17 AM
youngjeepr
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So what does it do when it cuts out? Does it miss fire or anything like that? How long does it cut out for? Does it happen when you hit bumps?

I would use your o2 sensor with or without a cat.. Because it tells the ECM what air/fuel mixture you have.. Which allows it to get the motor running properly..

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post #12 of Old 12-23-2012, 11:42 AM Thread Starter
Renegade85
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No it didn't start until I drive it for around about 2 miles then starts to miss and spit and sputter,I can shut it off let it chill for about 20 min and take off driving and runs fine until up to temp again then it starts all over
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post #13 of Old 12-23-2012, 01:27 PM
ROTTEN
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Quote:
Originally Posted by Renegade85 View Post
No it didn't start until I drive it for around about 2 miles then starts to miss and spit and sputter,I can shut it off let it chill for about 20 min and take off driving and runs fine until up to temp again then it starts all over
Unplugging the o2 brings it to a factory default setting. I ran mine with no o2 for 3 months. I had a sputter at first take off. Then it went away. Only when cold it did that. Not cold weather I mean a fresh start up. Try pulling a code up. Worth a shot

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post #14 of Old 12-23-2012, 01:43 PM
Why J?
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Are you getting a CEL? (check engine light)
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post #15 of Old 12-23-2012, 02:04 PM Thread Starter
Renegade85
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The emissions light was on but if I reach down and flick the little timer box it goes off ,when I changed the heater core I put the air box back in it kinda had the wire to the box in a bind and that's when that light started coming on but it was still running fine after that it wasn't until I went off road and decided to drop off in a big a$$ hole it keeled over the starter locked up at this point so we roll started it after we pulled it out, and it wasn't until I got about 5, 10 miles down the road it started doing this got it home changed everything like I said in my first post and now I can't get it to stop cutting out, prolly should have mentioned the water hole to begin with but ya,.
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