post #1 of Old 06-20-2013, 06:55 AM Thread Starter
brewcity1
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2004 WJ 
 
Join Date: Nov 2008
Location: Milwaukee
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9er bogging down and dying...now at mechanics

Hey guys...I finally dropped my 9er off at the mechanics Tuesday evening (this is day 2), because I cant figure out whats going on. Thank you to all that have helped, but my 9er is bogging badly, and intermittently still dying. On my way to the mechanic on Tuesday evening, the Jeep would barely get above 35 before it started to bog down when I hit the gas, and would barely accelerate. I practically had to coast into the shop. My mechanic said it threw a code for a bad coil...but I just replaced the coil and wires (as well as cap and rotor) with Kolaks ignition upgrade. I also replace the plenum gasket, and put in the upgraded injectors. He was unable to get it to cut out, and said during the drivability test...it did not bog down at all, which is extremely surprising since it happens a lot with me.
Is there anything that I can have him check that he may have overlooked... because we are both stumped as to what is going on. He is keeping it today to try to see if he can check on anything else, and reproduce the symptoms.
Thanks SO much for the help...it is truly appreciated.


2004 Grand Cherokee Limited 4.7L
General Grabber AT2's 255/65/17
1" Addco rear sway bar
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post #2 of Old 06-20-2013, 07:27 AM
dellis
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You wrote in an earlier thread that the intermittent dying was caused by the wire connecting to your coil (you could wiggle it and the problem either occurred or went away). Did you fix that?

You also wrote earlier that your cat needed replacing. Is it clogging? If so, that would cause your power problem ...
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post #3 of Old 06-20-2013, 07:33 AM Thread Starter
brewcity1
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Quote:
Originally Posted by dellis View Post
You wrote in an earlier thread that the intermittent dying was caused by the wire connecting to your coil (you could wiggle it and the problem either occurred or went away). Did you fix that?

You also wrote earlier that your cat needed replacing. Is it clogging? If so, that would cause your power problem ...
Thanks for the help...the coil wire (the pigtail harness under the coil going to the original wiring) was replaced with a new one. That managed to keep the Jeep running for a bit, but it didn't fix the issue. I was hoping the dying problems were linked back to that and not the coil itself or some other issue.
The cat does need replacing and will be tomorrow...but it does not seem clogged. I hit it with a mallet, and could not hear anything loose or rattling. I guess we will see tomorrow on my way home if anything has changed with the new cat and muffler. Just out of wanting to know...will a clogged cat cause a bogging down/hesitation issue?
Also...should I have him do a fuel line pressure test if he hasnt done one yet to check to see if I have good pressure or a bad fuel pump? Thats the only thing I did not check, as I dont have a gauge.

2004 Grand Cherokee Limited 4.7L
General Grabber AT2's 255/65/17
1" Addco rear sway bar
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post #4 of Old 06-20-2013, 08:22 AM
gs69350
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Quote:
Originally Posted by brewcity1 View Post
will a clogged cat cause a bogging down/hesitation issue?
Also...should I have him do a fuel line pressure test if he hasnt done one yet to check to see if I have good pressure or a bad fuel pump? Thats the only thing I did not check, as I dont have a gauge.
Yes, a clogged cat will cause bogging and hesitation. Also, a severely clogged fuel filter or (more likely) a failing fuel pump, will cause those issues as well.

1998 Jeep Grand Cherokee 5.9 Limited - Stone White - Stock for now.
http://www.facebook.com/groups/59limited/ <-- 5.9 Owner's group on FB.
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post #5 of Old 06-20-2013, 09:07 AM
dellis
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Quote:
Originally Posted by brewcity1 View Post
The cat does need replacing and will be tomorrow...but it does not seem clogged. I hit it with a mallet, and could not hear anything loose or rattling.
The typical symptom of a restricted cat is poor power under load, not rattling ... ye olde intake manifold vacuum test can identify if this is a problem or not.

With a restricted cat, the fine passages through the honeycomb have become clogged with carbon, or (because the engine is running rich or poorly), the cat overheats and internal melting happens. The first picture shows some clogging ... the second one shows melting.

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post #6 of Old 06-21-2013, 07:35 AM Thread Starter
brewcity1
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Quote:
Originally Posted by gs69350 View Post
Yes, a clogged cat will cause bogging and hesitation. Also, a severely clogged fuel filter or (more likely) a failing fuel pump, will cause those issues as well.
Thanks for the help...I guess once the cat and muffler are on this afternoon, I'll see if the bogging stops...if not, I'll take a look at the fuel filter and pump.
Thanks again for the info!

2004 Grand Cherokee Limited 4.7L
General Grabber AT2's 255/65/17
1" Addco rear sway bar
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post #7 of Old 06-21-2013, 08:01 AM
PolkaPower
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Quote:
Originally Posted by brewcity1 View Post
Thanks for the help...I guess once the cat and muffler are on this afternoon, I'll see if the bogging stops...if not, I'll take a look at the fuel filter and pump.
Thanks again for the info!
The filter and pump are replaced as one unit inside the tank. Get a fuel pressure gauge on the rail and look at the pressure. When the pump went out on my 95 it would stall, hesitate, buck, kind of felt like a bad TPS except for that it would almost stall out went I took turns too sharp.
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post #8 of Old 06-21-2013, 08:06 AM Thread Starter
brewcity1
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Quote:
Originally Posted by PolkaPower View Post
The filter and pump are replaced as one unit inside the tank. Get a fuel pressure gauge on the rail and look at the pressure. When the pump went out on my 95 it would stall, hesitate, buck, kind of felt like a bad TPS except for that it would almost stall out went I took turns too sharp.
Yeah...thats kinda what mine is doing.
Inside the tank...lovely!
I'll get a fuel pressure gauge and test, and report back.
Thanks a lot!

2004 Grand Cherokee Limited 4.7L
General Grabber AT2's 255/65/17
1" Addco rear sway bar
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post #9 of Old 06-21-2013, 08:27 AM
PolkaPower
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Quote:
Originally Posted by brewcity1 View Post
Yeah...thats kinda what mine is doing.
Inside the tank...lovely!
I'll get a fuel pressure gauge and test, and report back.
Thanks a lot!
Doing a fuel pump is easy. Drive it until below E then unbolt the two straps/fuel filler tube while you lower the tank with a jack. Replace pump and re install. After the first time you can do in in an hour or less. It's easy.
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post #10 of Old 06-21-2013, 09:41 AM Thread Starter
brewcity1
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Quote:
Originally Posted by PolkaPower View Post
Doing a fuel pump is easy. Drive it until below E then unbolt the two straps/fuel filler tube while you lower the tank with a jack. Replace pump and re install. After the first time you can do in in an hour or less. It's easy.
Ohh...OK. I'll search for a write up. Thanks man...I appreciate it!

2004 Grand Cherokee Limited 4.7L
General Grabber AT2's 255/65/17
1" Addco rear sway bar
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post #11 of Old 06-21-2013, 10:20 AM
zj97ltd
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Quote:
Originally Posted by PolkaPower View Post
Doing a fuel pump is easy. Drive it until below E then unbolt the two straps/fuel filler tube while you lower the tank with a jack. Replace pump and re install. After the first time you can do in in an hour or less. It's easy.
Unless it's like the pump in the '93 I had... died the morning after I filled the tank. That was fun.... past ZJ memories
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post #12 of Old 06-21-2013, 08:22 PM Thread Starter
brewcity1
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Dead again! :(

Hey guys...got my new cat and muffler on, but my 9er wouldnt start after it was complete.
It kept blowing a 20A fuse under the hood...even by just turning the ignition to the on position would blow it.
We tested it for spark...no spark from the coil. The muffler tech then hooked up a computer code reader...but it couldnt communicate with the Jeep.
None of my gauges work...and the overhead display was just dashes. Radio did work.
We went through about 6 fuses...and even disconnected the rear O2 sensor...fuse still blew.
Any idea what the heck is going on?

2004 Grand Cherokee Limited 4.7L
General Grabber AT2's 255/65/17
1" Addco rear sway bar
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post #13 of Old 06-21-2013, 09:04 PM
dellis
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All your mechanic did was replace the cat & muffler, and now it is blowing a 20A fuse? That doesn't seem right ... he must have been messing with something else.
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post #14 of Old 06-21-2013, 10:12 PM Thread Starter
brewcity1
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Quote:
Originally Posted by dellis View Post
All your mechanic did was replace the cat & muffler, and now it is blowing a 20A fuse? That doesn't seem right ... he must have been messing with something else.
I actually got it back from my mechanic, as he couldn't find anything wrong.
I then took it to the muffler shop this afternoon to get a new cat and muffler put on. Once they were done...it wouldn't start. It would crank...but no start and kept blowing that 20A fuse.

2004 Grand Cherokee Limited 4.7L
General Grabber AT2's 255/65/17
1" Addco rear sway bar
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post #15 of Old 06-21-2013, 10:37 PM
Rich93ZJ
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Your muffler guy shorted out your O2 sensor wire somewhere guaranteed. The fuse that is blowing is for the PCM thus, no gauges, not starting ect.....
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