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Unread 10-28-2014, 09:20 AM   #1
fireman7495
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Jeep TJ 4 banger ecu issue?

I recently bought a 97 TJ 4 banger just to fool around in and I am having a issue with it. Here is the issue I can turn the key until the battery kicks on and I have to keep it there for a few seconds until the gauges react then it starts. Sometimes it only a few seconds sometime but in the morning it takes forever. The guy at the shop said it was the computer but its hard to believe because of the issue in the morning. Anyone have any ideas?

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Unread 10-28-2014, 09:57 AM   #2
Jeepsr4me
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Start by inspecting and cleaning the battery cables and the battery lugs. Make sure it charged up also.
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Unread 10-28-2014, 10:17 AM   #3
fireman7495
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The battery seems to be fine it's the strangest thing.
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Unread 10-28-2014, 10:22 AM   #4
Jeepsr4me
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Yeah if you dont take and use advice given why ask a question?
Now if you told me that you have done that and all is checked out good.
I would say lets move to the next Cheaper inspection.
and so on till we get to the point of fixing it? Or take it back to the repair shop and say have at it.
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Unread 10-28-2014, 10:29 AM   #5
mrblaine
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Quote:
Originally Posted by fireman7495 View Post
The battery seems to be fine it's the strangest thing.
I've seen lots of fine batteries, lots of fine battery cables and lots of fine terminals. What I don't see that is fine is the connection between all of them and until you have that and it's perfectly clean and shiny, you're spinning your wheels.
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Unread 10-28-2014, 10:30 AM   #6
fireman7495
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Sorry Jeepers but I have had a quite a few TJ's but they have all had the 4.0 in them so this is a learning experience for me. I first thought it was the actuator pin but I ruled that out along with the ignition switch. When I did that I disconnected and cleaned the battery terminals. I thought maybe it was a fuse issue because before figuring out I could wait on gauges to turn on their on I would disconnect a few fuses and I assume it would reset itself. I just don't want to fork out the money for a ecu if I don't have to.
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Unread 10-28-2014, 11:40 AM   #7
Jeepsr4me
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Did you happen to look at the cables? I have seen perfectly lookiing cables that were eat up on the inside.
We have to crawl before we walk, even I have to take a step back sometimes from a fix cause it was a SIMPLE fix and I over complicated it.
Also iof the cables check out fine.
Next I would pull the gauge cluster out and verify that there is no corrosion on those pins either.
Sometimes just removing the cluster and installing back FIXES this.
Other times I had to get contact cleaner and clean the pins both on the cluster and the harness.

If that dont get it going
Take each connector off the computer and look at the pins. I had one pin that was corroded and it gave me fits fixing that.
Even if all the pins look good pop the back off that connector and look at the back of pins. thats where my issue was. I just spliced a new wire and pin in and was good.

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Unread 10-28-2014, 11:53 AM   #8
Jeepsr4me
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These are examples... Just the scare the crap out of ya.


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