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Unread 12-23-2008, 12:02 PM   #1
WhrexKing
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4.0 with Starting issue

One by one I keep knocking out the Jeeps problems, slowly but surely it's becomming more and more reliable for me.

When it's cold, even below zero, I can get it to start up and run just fine on the first start. I'll let it warm up and drive it to where I need to go, shut it down, even for as long as an hour, I come back, and all it'll do is crank over and WANT to start, but not actually start UNLESS, I floor the gas. As soon as I crank it with the gas floored, it'll start right up and run like normal.

It has 167,800 miles, and it has the I6 4.0L engine with the 4 Speed Automatic Transmission, and the old Renix Injection System.

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Unread 12-23-2008, 01:23 PM   #2
balloo93
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I'd check the "hall effect sensor" on the dist:

http://www.jeepforum.com/forum/showp...79&postcount=5

When it turns over and won't start. Disconnect the sensor and then reconnect it. Try again. If it fires up then replace that sensor.
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Unread 12-23-2008, 01:45 PM   #3
WhrexKing
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I can see that making sence. Is it a hard to replace?

I still don't get why it will sputter a little, then just crank, but as soon as I jab the gas to the floor, it'll start up.
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Unread 12-23-2008, 01:49 PM   #4
balloo93
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Best I can figure is it speeds up the sync between the injectors and the dist.

You may also want to check the fuel pressure.

I had a similar issue and it ended up being my ign coil, but that has never happened to anyone else and after a week it wouldn't even stay running at all.
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Unread 12-23-2008, 01:59 PM   #5
WhrexKing
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Ah, I see. Also makes sence. I had a terrible leak in the fuel line. What about the pressure regulator on the fuel rail? I do have some vacuum issues with the truck, but I have tried to address them.

I've been reading about the "Hall Effect Sensors", and anytime someone has an issue with them, the trucks will randomly stall, or not start at all.

First start, it always starts up perfectly. No misfires unless it is super subsonic cold, and even then it goes right away. No stalling, ever, perfect running condition, smooth idle.
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Unread 12-23-2008, 02:08 PM   #6
balloo93
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They seem to run fine even when heated, but once you turn it off and it's still warm there are issues.

You can check the vac line to the regulator. Where was your leak at?
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Unread 12-23-2008, 02:54 PM   #7
WhrexKing
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All over really. Just old and rotten vacuum lines that are wore out. And the big leak was caused by lose intake manitold bolts. That caused a really high idle.

As I said before. I drive it every day. It's a totally random thing too. Sometimes it'll just start right back up, even after only being off for a couple minutes. Othertimes all it will do is crank over and not start until I floor the gas.

I have no check engine light, dispite the fact I think it's burned out.

What sensors should I look in to first and how hard are they to replace? I'm thinking about replacing the one on the transfer case just to be safe. I am not sure about the one in the dist.
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Unread 12-23-2008, 03:02 PM   #8
balloo93
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I'd still try to disconnect and reconnect the hall effect sensor when it's not starting first.

If the NSS is bad or going bad, you wouldn't even get a crank. It just wouldn't do anything when in the start position.
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Unread 12-23-2008, 03:14 PM   #9
WhrexKing
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Alright, I went out, tried to turn it over. Failed to start, went in and unplugged the wire going in to the bottom of my dist.

Went and cranked it again and it fired right up with it unplugged. Plugged it back in, hessitated, but still started up again.

Whats my next step? It obviously needs to be replaced, and I priced the part already.

How hard is it to replace? Couple screws and it comes out, or do I have to do other stuff when I replace it?
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Unread 12-24-2008, 08:56 AM   #10
balloo93
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I've never done mine, but from what I have read it's just a matter of removing the dist cap, rotor and you can acess it from there. Disconnect your battery when playing with the dist.
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