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Unread 02-07-2011, 03:22 PM   #1
4low4fun
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AW4 Problems

So driving home to Ohio from Memphis yesterday I got a CEL. I didn't pay much attention to it because I have a o2 sensor that likes to throw a code sometimes.. As I was going through the mountains the CEL started to flash repeatedly as I was going up and down the hills and would stop flashing when the road leveled out. I then started to hear some rattling and then a faint grinding noise from under the floor boards whenever I would let off the gas and get back on it. I stopped at auto zone and had the codes read today it threw 5 codes...
1.multiple misfires
2.misfire in #2 cylinder
3.misfire in #5 cylinder
4. o2 sensor
5.transmission control cylinder

Fluid is black and smells burnt I've owned the Jeep for about 9 months and have never changed the fluid and have no idea if the PO did..

I made an appointment at the local transmission shop for thursday but am just curious what kind of trouble I might be in..

My Heep is a 00' I6 aw4 D30/35 199k miles..

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Unread 02-07-2011, 03:28 PM   #2
bds5
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Doesnt sound good. I will be watching your thread, I do think you can buy used tranny and do the work yourself alot cheaper a whole lot cheaper. Good Luck
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Unread 02-07-2011, 03:31 PM   #3
xjfever
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The flashing CEL is for the misfire problem. You likely overheated the tranny going through the mountains. That is the fastest way to kill the AW4, but that doesn't mean yours is dead. The new fluid may fix it, but it may not.
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  2. Sold'99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
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Unread 02-07-2011, 03:43 PM   #4
4low4fun
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There's several guys on craigslist with used trany's, all for around $250. I can definetly change it myself, I just don't much about automatics and am more or less going to use the shop to find out exactly what's wrong..

Now I wonder what's causing the misfires.. I changed the engine back in July and put new EVERYTHING on it when I did...
I hate it! everytime I get enough money together for a lift and tires I have to sink a bunch of loot into it...
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Unread 02-07-2011, 04:01 PM   #5
xjfever
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You haven't had any coolant loss have you?
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  1. '95 XJ country edition, 4" coils/3/4" spacers, HD leafs with extra main added in, Ironman adjustable control arms, rough country shackles, aussie locker, JK rubicon shocks, 35" mudder's, soft 8's, cobra cb
  2. Sold'99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
  3. Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
4. 04 Dodge ram 1500 quadcab, yes, it has a hemi.
5. '08 BMW X3, Mods in progress.
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Unread 02-07-2011, 04:09 PM   #6
4low4fun
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Quote:
Originally Posted by xjfever View Post
You haven't had any coolant loss have you?
Nope.. engine runs strong too..
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Unread 02-07-2011, 04:23 PM   #7
tjwalker
It's the crank sensor!
 
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A "flashing" check engine light indicates a serious misfire, which if ignored, will destroy your catalytic converter.

*What brand plugs are you running? Stay away from Bosch

*Keep an eye on the coolant reservoir. You don't mention if you still have the "infamous" 0331 cylinder head on your engine, which is more prone to cracking than others, which can lead to coolant loss and mixing with the oil and can also lead to misfires
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Unread 02-07-2011, 05:00 PM   #8
4low4fun
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Auto lite plugs.
I'm not losing any antifreeze and the oil is clean. I kind of thought the bad 02 sensor was causing the misfires?
as far as misfires I never even knew it had misfired until I saw the code. it never hesitated/sputered anything..
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Unread 02-07-2011, 05:04 PM   #9
4low4fun
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In my original post i had mentioned the fluid being black, I was talking about the transmission fluid. just to clearify
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Unread 02-08-2011, 09:13 AM   #10
4low4fun
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Bump
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Unread 02-08-2011, 09:38 AM   #11
tjwalker
It's the crank sensor!
 
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If you have a P0300 random misfire code, it means the misfire is random and is moving around from cylinder to cylinder.

The cause here would likely be something COMMON to the entire engine, that upsets the engine's air/fuel mixture, such as a major vacuum leak, or unusually low fuel pressure (weak pump or faulty pressure regulator).

Start by searching for a vacuum leak and also verifying fuel pressure with a gauge on the fuel rail. For a 2000, you should have 49 psi, plus or minus 5 psi. The only accurate way of verifying fuel pressure is with a gauge.

Here are some other "possibilities" from the OBDII website.

Faulty spark plugs
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Faulty camshaft position sensor
Defective computer
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Unread 02-08-2011, 07:26 PM   #12
4low4fun
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Quote:
Originally Posted by tjwalker View Post
Here are some other "possibilities" from the OBDII website.

Faulty spark plugs
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Faulty camshaft position sensor
Defective computer
I'm going with my O2 sensor is causing it.. It's bad anyway so I'll start by changing that..

So took the Jeep out to Dad's today. After doing some tinkering and letting him drive it we came to the UNproffesional conclusion that it's the torque converter....... Still have an appointment with the shop on Thursday morning to let them do a proper diagnosis.

So I found a transmission from Stricker Brothers (salvage yard near here that has great prices and warranties thier stuff) they have several tranny's the one I have my eye on is $275 and has 88k miles on it.
Auto zone sales torque converters for $150.
my Jeep is about to turn 200k in like 750 miles.
so what do you guys think? if it indeed is the torque converter change the whole tranny or just change the converter??
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Unread 02-09-2011, 04:28 AM   #13
tjwalker
It's the crank sensor!
 
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Transmission diagnosis can be very tricky.

I'd see what the tranny shop has to say.
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Unread 02-09-2011, 04:51 PM   #14
waterdowg
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Replace plugs with plain old Champion plugs. Nothing special just cheap ones. From my 22 years of driving jeep with either the 4.2 or the 4.0 all run better on champion.
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Unread 02-10-2011, 03:25 PM   #15
4low4fun
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Quote:
Originally Posted by waterdowg View Post
Replace plugs with plain old Champion plugs. Nothing special just cheap ones. From my 22 years of driving jeep with either the 4.2 or the 4.0 all run better on champion.
good to know
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