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Old 04-05-2008, 11:05 AM   #1
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Jeep Wrangler Hunting And Missing

Hi, im new here, can you help me out with my wrangler, its a 1998 jeep wrangler sahara manual??
When its sitting at idle the engine is hunting, it doesnt do it all the time so im not sure what it could be
And sometimes when your driving the engine starts missing then it will clear and drive perfectly normal?????
Finally the light switch was broken when we bought it so we bought a new one from the USA but its not working corectly then you put the side lights on the rear lights work but as soon as you put main beam on the back lights go out
Im from the UK but i had to but myself down as being in a american state as that was the only option
Heres the jeep and a few of our other toys






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Old 04-05-2008, 11:06 AM   #2
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We also have 9 ford cortinas, i wont bore you with pictures of all of them




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Old 04-05-2008, 11:06 AM   #3
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Old 04-05-2008, 11:33 AM   #4
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Nice carlot you got going on!

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Old 04-05-2008, 11:47 AM   #5
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i think the europe versions have different wiring (not sure) but nice cars ya have there!!
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Old 04-05-2008, 11:49 AM   #6
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this is our other toy





And our mk3 cortina was in Retro Ford Magazine this month


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Old 04-05-2008, 05:41 PM   #7
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does no one have any ideas then??
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Old 04-05-2008, 06:05 PM   #8
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I think I see the problem! The steering wheel is on the wrong side!



Seriously though...

"Hunting" ? Not sure I'm familiar with the term. Could you explain it a bit?
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Old 04-05-2008, 06:57 PM   #9
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I think I see the problem! The steering wheel is on the wrong side!

what he said
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Old 04-05-2008, 07:18 PM   #10
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I think he means its idling rough, as in the rpms are jumping a few hundred rpms like it had a cam.

If thats the case, the 4.0s are notorious for having dirty/clogged idle air control motors in the throttle body. I would take off the throttle body and give it a GOOD cleaning, paying close attention to IAC. Make it all nice and shiny, and your idle problems should go away.

If your misfiring while driving, start with the usual. Plugs, distributor cap/rotor, maybe plug wires depending on mileage.

How many miles are on this Jeep?
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Old 04-05-2008, 07:41 PM   #11
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HI thanks for that its done 60,000 from new so not to high
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Old 04-06-2008, 06:10 AM   #12
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Hi Fleet, I'm also from this side of the pond and I also have the same rough idle! Maybe its the crappy weather? I have fitted new plugs, rotor, cap, plug leads, air filter and yesterday a new oxygen sensor! Depending on where you are, but I know of a good Jeep garage as well as an excellent tech who works from home. I just like to fight my way through things .
Later
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Old 04-06-2008, 07:53 AM   #13
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Just out of curiosity how is the fuel quality over there and what Octane rating are you running ? If you are putting hi-test in there switch it to 87 or 89 octane, I don't know how you rate it over there.
As for cleaning the Throttle body thats a good idea, you can clean it on the engine but it won't do as good a job with one of the spray type cleaners. Also make sure you use a PLASTIC SAFE cleaner, most of the sensors are plastic.
Removing it and cleaning it on the workbench is the way to go, dismounting the sensors and cleaning them separately.
As for the light problem, how are those fog/driving lights hooked up ? you need to be careful if you have tied them into your high beam/low beam switch, if they are tied in there I would disconnect where they are wired into the harness and see if the problem changes, I've seen this happen on a few XJ's where they were added that way. The wiring differences are not that great but there are a few gotcha's in there, enough that the XJ factory service manual does have almost duplicate wiring diagrams for the export right hand drive ones.

As for the cortina's, any cosworths in the lot ?

You must be one of those people who give the greenies fits over there
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Old 04-06-2008, 08:48 AM   #14
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Just out of curiosity how is the fuel quality over there and what Octane rating are you running ? If you are putting hi-test in there switch it to 87 or 89 octane, I don't know how you rate it over there.
As for cleaning the Throttle body thats a good idea, you can clean it on the engine but it won't do as good a job with one of the spray type cleaners. Also make sure you use a PLASTIC SAFE cleaner, most of the sensors are plastic.
Removing it and cleaning it on the workbench is the way to go, dismounting the sensors and cleaning them separately.
As for the light problem, how are those fog/driving lights hooked up ? you need to be careful if you have tied them into your high beam/low beam switch, if they are tied in there I would disconnect where they are wired into the harness and see if the problem changes, I've seen this happen on a few XJ's where they were added that way. The wiring differences are not that great but there are a few gotcha's in there, enough that the XJ factory service manual does have almost duplicate wiring diagrams for the export right hand drive ones.

As for the cortina's, any cosworths in the lot ?

You must be one of those people who give the greenies fits over there
Thanks, i shall take it off
The fog lights are wired up to a separate switch on the dash
No cossys just kent engines and pintos im afraid
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Old 04-10-2008, 03:40 PM   #15
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That new Bullitt is nice, I've heard good things about them. Much better than the old Bullitt. Nice collection of rides. What kinda bike is that I see in there?

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