Back in a WJ! Have a troubleshooting question (shifting) - JeepForum.com
 
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post #1 of 14 Old 03-29-2020, 10:59 PM Thread Starter
XJ4oh
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Back in a WJ! Have a troubleshooting question (shifting)

What’s up JF... long time user, back in my 3rd Jeep FINALLY. Way back when I joined, I had a 97 Cherokee I owned for nearly 10 years. Unfortunately I sold it. Shortly thereafter, I got into an 04 GC Columbia Edition, but it was 2WD. It was my hot rod, very quick for an SUV and incredibly comfortable. I absolutely loved that truck. I sold it due to some recurring issues and gas prices at the time combined with the fact I was commuting almost 40 miles 5 days a week for work.

I traded it for a Focus ST, had that car for three years and traded it on w 2016 Mustang GT. The entire time I had been wanting to get back into a WJ specifically. I had been passively looking and then started getting serious a few months ago and ended up buying an 02 Overland. It had 183k and overall, the body and interior are in great shape. The PO took care of a lot of the annoying things that occur and I learned to not care about some of the stuff that bothered me about my old WJ.. and I got this sub-$2k so I can’t complain.

I immediately did a few things:
Diff fluid change (Vavoline full sun fluid, Mopar friction mod)
TC fluid change.. Mopas special sauce for the NV-247 (this fixed a lot of crunch engaging/disengaging the t case)
Dropped the trans pan, changed the filters and did a non-pressured flush
Lift glass struts
Replaced center console lid
Added cargo cover
Added 10 disk changer assembly (it was missing)
Replaced passenger side mirror
Oil/filter change
Fuel filter
Gas cap

PO installed a 3” spacer/shock lift and take-offs from a JK. Snorkel hasn’t been plumbed to the airbox and that’s on the to-do list.

So here’s the issue:

Wide open throttle shifts are not normal. If I floor it in first, it will climb to about 4k just fine and then it feels like it’s hitting a wall all the way to 5500 and will hold gear until I let off the throttle part way, then it shifts.

Doesn’t matter what gear, shifts at WOT throttle aren’t happening correct.

I feel like this may be a fuel issue, as it feels like the engine is losing a bit of power at higher RPM. I changed the fuel filter hoping to find it was clogged but the old one wasn’t even draining anything nasty looking. The PO said he replaced the fuel pump semi recently.

Any obvious suggestions? My thought was the fuel pump is bad again, clogged cat(s)... ???

My 04 hauled ***. This does not. I don’t expect it to as it has a 3” lift and roughly 32” JK take-off’s, but I can tell something is wrong. I’m mechanically inclined and pretty determined to figure this out. I need it fixed so I have passing power if/when needed.


'97 XJ... 4.0 4x4 AW4. 2" budget boost w/t-case drop.
31x10.5 Cooper Discoverer ST's on 15x7 Cragar Soft 8's.
Intake, Ported TB, TB spacer, Super 40 Flowmaster.
Baja Aux. Lighting.
Green Jeep Club #185, Nowhere to Wheel Jeep Club member #1
'04 WJ - Columbia Edition - 4.7HO 2WD
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post #2 of 14 Old 03-30-2020, 05:14 AM
Rixdafix
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Quote:
Originally Posted by XJ4oh View Post
Any obvious suggestions? My thought was the fuel pump is bad again, clogged cat(s)... ???
Eliminate guess work.
Use fuel pressure test gauge to check fuel pressure (with long enough hose to observe while driving).
Use vacuum gauge to check exhaust restriction (again, with long enough hose to observe while driving) or take to reputable shop to check for restriction.
Good luck, you'll figure it out and congratulations on getting back in a WJ.
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post #3 of 14 Old 03-30-2020, 07:28 AM
TheBoogieman
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Trans solenoid.

Quote:
Originally Posted by jeepinmichguy_ View Post
TheBoogieman is a jerk.
03' Rubicon/Zone 4" coils with 1" spacers up front/Rancho shocks/5.13 gears-35" MTZs/Black Magic brakes.
99' XJ /4.0L-AW4/ 5.5" lift / Rancho RS5000X shocks/33" DC Extreme country MTs. Jeep #18
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post #4 of 14 Old 03-30-2020, 11:17 AM
jtec
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I am confused -- 97XJ - 04 WJ, I see the 04WJ's mentioned in past tense as is not current vehicle or engine.

3rd reading - this is an 02 WJ ? which engine? correct?

But I do get confused easily. IDK

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #5 of 14 Old 03-30-2020, 12:56 PM
xcaliber81
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Quote:
Originally Posted by jtec View Post
I am confused -- 97XJ - 04 WJ, I see the 04WJ's mentioned in past tense as is not current vehicle or engine.

3rd reading - this is an 02 WJ ? which engine? correct?

But I do get confused easily. IDK
He has an 02 overland with a 3" lift assuming it's original it has the 4.7 H.O
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post #6 of 14 Old 03-30-2020, 01:11 PM
jtec
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that being a 4.7L it has a 545RFE trans and it is Electronically controlled.
So check for codes, use a scanner.

Lifting your foot changes the TPS and MAP readings and trans will shift as no longer "WOT".

Is your AIRBAG light on and does the airbag bulb come on EVERY start for a test?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #7 of 14 Old 03-30-2020, 03:45 PM Thread Starter
XJ4oh
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Join Date: Nov 2004
Location: Hot & sunny south..
Posts: 4,472
Quote:
Originally Posted by Rixdafix View Post
Quote:
Originally Posted by XJ4oh View Post
Any obvious suggestions? My thought was the fuel pump is bad again, clogged cat(s)... ???
Eliminate guess work.
Use fuel pressure test gauge to check fuel pressure (with long enough hose to observe while driving).
Use vacuum gauge to check exhaust restriction (again, with long enough hose to observe while driving) or take to reputable shop to check for restriction.
Good luck, you'll figure it out and congratulations on getting back in a WJ.
Good suggestions. Thank you and yeah, I am happy to be in one again.

Quote:
Originally Posted by TheBoogieman View Post
Trans solenoid.
Had this issue in my 04, but it would limit the trans to limp mode which was 3rd gear only I believe.

Do you know if this is serviceable without dropping the valve body?

Quote:
Originally Posted by jtec View Post
I am confused -- 97XJ - 04 WJ, I see the 04WJ's mentioned in past tense as is not current vehicle or engine.

3rd reading - this is an 02 WJ ? which engine? correct?

But I do get confused easily. IDK
You’re correct. I am on my third Jeep which is an 02 Overland.. 4.7HO, “J” VIN.

Quote:
Originally Posted by xcaliber81 View Post
Quote:
Originally Posted by jtec View Post
I am confused -- 97XJ - 04 WJ, I see the 04WJ's mentioned in past tense as is not current vehicle or engine.

3rd reading - this is an 02 WJ ? which engine? correct?

But I do get confused easily. IDK
He has an 02 overland with a 3" lift assuming it's original it has the 4.7 H.O
Correct.

Quote:
Originally Posted by jtec View Post
that being a 4.7L it has a 545RFE trans and it is Electronically controlled.
So check for codes, use a scanner.

Lifting your foot changes the TPS and MAP readings and trans will shift as no longer "WOT".

Is your AIRBAG light on and does the airbag bulb come on EVERY start for a test?
Airbag light comes on and goes off as normal.

I have some EVAP codes:
P0420
P0455
P0442

Those were there when I bought it.

'97 XJ... 4.0 4x4 AW4. 2" budget boost w/t-case drop.
31x10.5 Cooper Discoverer ST's on 15x7 Cragar Soft 8's.
Intake, Ported TB, TB spacer, Super 40 Flowmaster.
Baja Aux. Lighting.
Green Jeep Club #185, Nowhere to Wheel Jeep Club member #1
'04 WJ - Columbia Edition - 4.7HO 2WD
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post #8 of 14 Old 03-30-2020, 04:41 PM
jtec
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did you use a scanner to check codes?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #9 of 14 Old 03-30-2020, 05:52 PM Thread Starter
XJ4oh
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Location: Hot & sunny south..
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Quote:
Originally Posted by jtec View Post
did you use a scanner to check codes?
Yes. The guy I purchased it from had a scanner we hooked up.

'97 XJ... 4.0 4x4 AW4. 2" budget boost w/t-case drop.
31x10.5 Cooper Discoverer ST's on 15x7 Cragar Soft 8's.
Intake, Ported TB, TB spacer, Super 40 Flowmaster.
Baja Aux. Lighting.
Green Jeep Club #185, Nowhere to Wheel Jeep Club member #1
'04 WJ - Columbia Edition - 4.7HO 2WD
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post #10 of 14 Old 03-31-2020, 09:54 AM
jtec
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Live data would be a good window into the running condition and sensors.

I wonder if the EVAP leaks could affect MAP and then shifting, look at purge valve for a leak -sticking open.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #11 of 14 Old 04-01-2020, 07:58 PM Thread Starter
XJ4oh
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Location: Hot & sunny south..
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Quote:
Originally Posted by jtec View Post
Live data would be a good window into the running condition and sensors.

I wonder if the EVAP leaks could affect MAP and then shifting, look at purge valve for a leak -sticking open.
That’s a good point. I did notice a new whirring noise under the hood today that isn’t RPM dependent and comes on if the key is on accessory as well. My first thought was EVAP purge or fuel pump. I didn’t do a lot of hunting but it sounds like it’s coming from under the hood on the drivers side.

'97 XJ... 4.0 4x4 AW4. 2" budget boost w/t-case drop.
31x10.5 Cooper Discoverer ST's on 15x7 Cragar Soft 8's.
Intake, Ported TB, TB spacer, Super 40 Flowmaster.
Baja Aux. Lighting.
Green Jeep Club #185, Nowhere to Wheel Jeep Club member #1
'04 WJ - Columbia Edition - 4.7HO 2WD
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post #12 of 14 Old 04-02-2020, 12:16 AM
Klarah523
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Quote:
Originally Posted by XJ4oh View Post
Thatís a good point. I did notice a new whirring noise under the hood today that isnít RPM dependent and comes on if the key is on accessory as well. My first thought was EVAP purge or fuel pump. I didnít do a lot of hunting but it sounds like itís coming from under the hood on the drivers side.

Under the hood on the drivers side could be the Evap pump, not sure if that runs in just ACC or not.

2000 WJ (Laredo w/ 4.0L)
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post #13 of 14 Old 04-02-2020, 08:40 PM Thread Starter
XJ4oh
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Location: Hot & sunny south..
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Quote:
Originally Posted by Klarah523 View Post
Quote:
Originally Posted by XJ4oh View Post
That’s a good point. I did notice a new whirring noise under the hood today that isn’t RPM dependent and comes on if the key is on accessory as well. My first thought was EVAP purge or fuel pump. I didn’t do a lot of hunting but it sounds like it’s coming from under the hood on the drivers side.

Under the hood on the drivers side could be the Evap pump, not sure if that runs in just ACC or not.
I was able to pinpoint it to the rear. Black box next to the fuel tank. Part of the evap system as well but I can hear something cycling on and off and the noise is definitely coming from there.

Is that the evap canister?

'97 XJ... 4.0 4x4 AW4. 2" budget boost w/t-case drop.
31x10.5 Cooper Discoverer ST's on 15x7 Cragar Soft 8's.
Intake, Ported TB, TB spacer, Super 40 Flowmaster.
Baja Aux. Lighting.
Green Jeep Club #185, Nowhere to Wheel Jeep Club member #1
'04 WJ - Columbia Edition - 4.7HO 2WD
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post #14 of 14 Old 04-02-2020, 11:59 PM
Klarah523
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Quote:
Originally Posted by XJ4oh View Post
I was able to pinpoint it to the rear. Black box next to the fuel tank. Part of the evap system as well but I can hear something cycling on and off and the noise is definitely coming from there.

Is that the evap canister?

Yes, various Evap widgetry is tucked behind the wheel well cover and/or back bumper depending on your Jeep.


Random video of a guy leak hunting to give you a general idea:



I forgot that mine is a bit odd and has the canister in the front, I don't know if that's a 4.0 thing, a CA emissions thing, or if in it's spotty history some PO relocated it.

2000 WJ (Laredo w/ 4.0L)
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