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  #13  
Old 03-15-2015, 07:40 PM
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Re: Trams Band Adjustment Issue

Did you recheck the throttle valve cable for proper adjustment?
Also did you check for any faults stored in PCM? If you donīt have a scanner, use the keydance: ignition switch off/run three times and leave in run at the third time. The odometer will show DONE when no fault stored, or a fault code(s).
Did you replace the rear end of the transmission? The rear end is the overdrive unit. For what reason did you replace it?

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  #14  
Old 03-15-2015, 08:37 PM
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Re: Trams Band Adjustment Issue

No fault codes. The build sheet just says 42RE- 4 speed. 1999 Jeep Grand Cherokee Laredo, 4.0, 4x4.

Just spent an hour looking over things, making sure I didn't leave anything off/knocked something off.

Just weird. This is a new problem, so it's very likely something I did. But I just swapped rear ends, changed trans filter/fluid & adjusted the rear band.

I logically keep thinking it's something with the band adustment. But should be adjusted right.

Would a Trans shifting issue cause a pop/backfire? Motor was/has been fine. This stutter thing is just weied.

Thanks
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  #15  
Old 03-15-2015, 08:45 PM
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Re: Trams Band Adjustment Issue

PS I did readjust the TV, no change.
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  #16  
Old 03-15-2015, 08:54 PM
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Re: Trams Band Adjustment Issue

I dont see any relation with a transmission problem and the engine back firing. Back firing sounds more as an engine valve train synchronization.
So far what reason did you change the transmission rear end?
Fluid level is ok?
When im home i will have a look to see if there is any difference between the 99-00 and 01-04 service manual regarding the band adjustment.
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  #17  
Old 03-15-2015, 09:20 PM
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Re: Trams Band Adjustment Issue

By rear-end I mean the entire rear axle assembly.
That was a separate ssue, it had been going out for some time.

The trans was doing that late shift thing, but other than that it was fine.

Since I was dirty and working on the rear end/axel. I decided to also do the trans filter, fluid and rear band adjustment. Was hoping that would fix the last shift issue.

When I did a test drive after completing the rear axel swap, that's when I noticed the surging/slipping issue.

Rear axel sounds fine now. Just not sure what else happened.
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  #18  
Old 03-16-2015, 08:14 AM
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Re: Trams Band Adjustment Issue

Ah, ok, my mistake.
Just checked the band adjustment in the 99-00 manual and its exactly the same as i told you before. Just to be sure that the TV cable is adjusted properly, i will attach here the adjustment pages from the manua.l
Attached Files
File Type: pdf TV cable adjust.pdf (129.9 KB, 7 views)
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  #19  
Old 03-16-2015, 08:16 PM
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Re: Trams Band Adjustment Issue

Although it was fine before the axel swap & tranny band adjustment. I'm now thinking it's something else.

I started it this morning and got a P0306. So I thought I would try a coil pack. Autozone was the only parts store close with one in stock, so I figured.... I knew better but I figured it could not hurt. Put it on & could not get the Jeep to stay running. Took off reinstalled, same thing. Put the old one back on and it was OK. Does Duralast make anything that works?

Anyway, went for a drive and still the same problem, but worse today. Jeep died several times. Finally got it started and got it home. It's now idling real rough.

Have not got any more codes. But I'm starting to think it's the fuel pump now because of the dieing & not wanting to restart. That could also explain the cutting out/sputtering at higher speeds too.

But would a fuel pump cause the rough idle? That's a new symptom along with the dieing & not wanting to restart.

Thoughts? Thanks again.
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  #20  
Old 03-16-2015, 08:56 PM
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Re: Trams Band Adjustment Issue

If the pressure from the fuel pump is real low, it could cause rough idle, but even more so hessitation on acceleration. Since you changed the rear axle, did you have to disconnect fuel lines on the fuel filter? Maybe a line not reconnected completely or making a sharp bend somewhere?
Best would be to measure the fuel pressure at the rail, which should be 49 +- 5 psi. A too low fuel pressure could cause a misfire as well, if the mixture becomes too lean to burn.
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  #21  
Old 03-16-2015, 09:06 PM
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Re: Trams Band Adjustment Issue

I didnt read the whole thread over, so do you have a scanner which shows live data? If so, you could check the STFT figures (short term fuel trim), which normally is in the single digit numbers. When fuel pressure is low, the PCM will try to compensate for the lack of fuel(lean mixture) by increasing the STFT to +30 more or less.
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  #22  
Old 03-17-2015, 07:38 AM
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Re: Trams Band Adjustment Issue

I didn't have to disconnect any of the gas lines for the rear axel install. But I did double check for any pinched hoses/etc. Especially since I didn't have this problem before.

I don't have any diagnosis equipment. But I'm going to get a pressure guage today and check the fuel rail.

I had a fuel pump completely fail before, but not run poorly as failing.

The other night it just cut out while driving. Yesterday did the same thing but then got worse quick. I didn't think it would restart again. But it did, sputtered/cut out the last 1/8 mile back to my house.

It started this morning, but it's still idling real rough. But it does rev-up when giving it gas.
You would think it would cut out if it was the fuel pump?

But the other symptoms sound typical of a fuel pump. Hopefully the pressure test will tell me.

Thanks - keep the thoughts coming! Still can't belive this problem starts after sitting in the garage for the axel and tranny work. But it's starting to sound unrelated.
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  #23  
Old 03-17-2015, 08:24 AM
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Re: Trams Band Adjustment Issue

When you want to do your own maintenance and trouble shooting, then a scanner is almost a must have. If you have an android phone, you could buy a cheap bluetooth dongle and install the free Torque app. Besides reading and clearing faults, it will also show you live data of many sensors.
Regarding the fuel pump, if it will not idle well due to low fuel pressure, i would presume that it would stumble during acceleration as well. Be aware that low fuel pressure is not necessary the fuel pump, it could also be a clogged fuel filter or bad fuel pressure regulator inside the filter.
If the fuel pressure checks out ok, i would almost say that the problem is the crank sensor.
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  #24  
Old 03-17-2015, 11:22 AM
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Re: Trams Band Adjustment Issue

I'm going to replace the fuel filter tonight to see if that helps. Needs it anyway.

That app looks great, but I guess I need some special Bluetooth cable that connects to the ODC port? Where could I find that?

Right before leaving for work I jumped in the jeep turned the key, & listened to the fuel pump. It sounded normal and ran for about 3 seconds. So I think it thinks it pressurized the line?

Tried to start the Jeep and couldnt. Holding the gas down would get it going for a few seconds but running terrible, rough, cutting out, etc.

Weird. Whatever it is has gotten worse.
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