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Unread 02-02-2013, 08:50 PM   #1
sergio
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1995 ZJ 
 
Join Date: Apr 2012
Posts: 174
Stalling on freeway.

So I've had my zj for a while. Every time I drive on the freeway around 65-70 mph it's bucks and stalls. Like if it's cutting gas. I've changed the MAP, TPS, EGR valve, done a full tune up. I don't know what to do anymore. I've read about the PCM wiring harness on the I6 not making contact is this similar to the 5.2?

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Unread 02-02-2013, 09:04 PM   #2
yamifj1200
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1997 ZJ 
 
Join Date: Jan 2013
Location: Richmond, Va.
Posts: 72
Have you checked the fuel pressure from the pump to make sure its working? I'm not sure where the fuel filter is on your Jeep, but that could be stopped up as well.

Eric M
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Unread 02-02-2013, 09:16 PM   #3
papitt
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1995 ZJ 
 
Join Date: Dec 2008
Location: Stephenville Texas 76401, Texas
Posts: 709
.. I bet you have a bad fuel pump .. Easiest thing to do is buy a fuel pump pressure tester and hook it up and go drive the jeep . Oh you need a gauge with a long hose on it so you can place it under the wiper blade so you can see it while driving . I did mine a few days ago .. Mine is a 6 cyl .. so my pressure is 38 lbs psi . but as I get up over 45 my pressure will drop to 10 at times 25 at other times but it's supposed to be 38.
... I only need that 400.00 fuel pump ...
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Unread 02-02-2013, 11:00 PM   #4
ilive4cars0122
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definitely what those guys said but also did that tune up include an ignition coil? I remember mine was doing the same thing at highway speed just dying and sometimes roaring back to life instantly as it was dying.
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Unread 02-02-2013, 11:05 PM   #5
papitt
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ilive4cars0122 ... Explain what you did with the coil .. My ZJ 4.0 Jumps ..Bucks. Pitches....BUT UP AT 40 plus MPH .. This is my 3rd ZJ and all of them have had bad fuel pump. Even after putting a new fuel pump in . It still has some issues.
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Unread 02-02-2013, 11:12 PM   #6
ilive4cars0122
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1998 ZJ 
 
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Location: , NY
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Basically when doing highway speed mines would start to putter and almost die then roar back to life or just die and as i was coasting for a second it would roar back to life. Finally, one day it just died and wouldn't start back up. No check engine light or anything. A shop diagnosed that it was the ignition coil and wanted an obscene amount of money to replace it. I ended up getting an msd ignition coil and tune up kit from Kolak and installing it all myself. The price of a tow and all that was just the same as they wanted to do the ignition coil. If you have a haynes manual or factory service manual there is a description of how to test the coil but I didn't do that part the shop did. Not because it seemed to hard to test it...but at the time I didn't know that could be the problem.
Quote:
Originally Posted by papitt View Post
ilive4cars0122 ... Explain what you did with the coil .. My ZJ 4.0 Jumps ..Bucks. Pitches....BUT UP AT 40 plus MPH .. This is my 3rd ZJ and all of them have had bad fuel pump. Even after putting a new fuel pump in . It still has some issues.
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Unread 02-03-2013, 01:11 AM   #7
sergio
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1995 ZJ 
 
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Quote:
Originally Posted by yamifj1200
Have you checked the fuel pressure from the pump to make sure its working? I'm not sure where the fuel filter is on your Jeep, but that could be stopped up as well.

Eric M
During tune up I also replaced the gas filter. I also used seafoam to clean out the engine but haven't changed the oil or filters since then.
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Unread 02-03-2013, 01:14 AM   #8
sergio
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Quote:
Originally Posted by ilive4cars0122
definitely what those guys said but also did that tune up include an ignition coil? I remember mine was doing the same thing at highway speed just dying and sometimes roaring back to life instantly as it was dying.
I didn't do a coil change. Honestly I don't even know what that is. Mine seems to do it over past 50mph. Gets annoying but I can't quit. How much are the ones kolak selling go for?
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Unread 02-03-2013, 06:31 AM   #9
ZeeJay1997
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Quote:
Originally Posted by sergio View Post
Every time I drive on the freeway around 65-70 mph it's bucks and stalls.
how does it do on hard acceleration, from a stop and kick down to pass?
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Unread 02-03-2013, 08:10 AM   #10
ilive4cars0122
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I couldn't tell you what just the ignition coil costed as it was part of the package deal for the tune up. I do know that a standard ignition coil is like $40 from advance auto though. If you go on advanceauto website and type in ignition coil it should give you an idea of what it looks like. I don't know what engine you have off hand but if you have the 5.2 or 5.9 it should be on the passenger side to the left and behind the belt area. Pretty much around the height of the base to your battery.
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Unread 02-03-2013, 12:59 PM   #11
sergio
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Quote:
Originally Posted by ZeeJay1997

how does it do on hard acceleration, from a stop and kick down to pass?
At hard acceleration or during it performance good and doesn't buck or stall. It's mostly when I try to maintain speed that it does it. If that makes sense.
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Unread 03-28-2013, 08:54 PM   #12
Ruby3
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Bump. Mine is doing the same thing. Been doing research, could be a plugged catalytic converter?
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Unread 04-01-2013, 12:18 PM   #13
sergio
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I thought the same thing. I tried tapping the cat and it sounds hollow to me. I'll be changing the plenum gasket today. I'll let you know what the results are.
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Unread 04-01-2013, 01:40 PM   #14
zjosh93
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Oddly, the last time my alternator went bad these were my symptoms. It just misfired at highway speeds then slowly the speed required dropped down to about 40 mph. It still looked like it was charging on the gauge and the check engine light was off. I checked at the battery with the engine running and the voltage was 12.6 so I thought it was weak and might as well get that fixed before tracking down the misfire. Swapped the alt and it hasn't misfired since. Go figure.
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Unread 04-02-2013, 02:57 AM   #15
sergio
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So I changed the plenum gasket. There was a big oil leak. The results are awesome. Runs alot smoother and doesn't hesitate on the freeway anymore. Speed picks up real quick and now runs like a V8 should.
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