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  #73  
Old 12-11-2014, 11:20 PM
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Re: jeep surge idle

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Originally Posted by Jeff1119 View Post
Does anyone know if theres any important wires by the jeeps wheels that could possibly get wet when the tires are wet such as driving around on wet roads? Just took a 5 hour drive tonight back and forth to jersey to go out to dinner and not a single surge all night. All because the roads were dry

Its not suppose to rain tomorrow but i wanna look under the jeep and to see what could possibly be getting wet. I was hoping someone could give me some pointers on where to look. I really want to get to the bottom of this now that i know wet roads cause the surge which i guess means when it snows it will surge all the time wanna get to the bottom of this before that happens lol
I've suddenly started having the same problem. It's due to the throttle position sensor getting water inside of it.

My problem suddenly started occurring due to car washes in below freezing temps. Nothing had changed under the hood, so no reason why it should suddenly be starting to collect water. My theory is that washing in freezing weather creates a mist that's either entering the TPS by way of the throttle shaft, or a leaky TPS body. Rain soaked roads are probably creating a similar condition.

I've replaced one TPS already, and just chalked it up to being old and the seams cracked & let in water. The one month old new one just did the same thing tonight. Both came from Napa, so I'm gonna inspect this one a whole lot more thoroughly and perhaps buy a different brand.

If you think you got it bad now, wait 'til the water inside it freezes; You'll be limping home because it takes a long time for the engine to deliver enough heat to melt the water inside. Think 3 grand to do 10 mph, because the TPS also controls tranny shifts.

I didn't check before to see if the throttle shaft perhaps has O-rings somewhere that have worn out, but that's a possibility. If not, the throttle shaft can be tightened up by doing the following:

Get a small pipecutter. Tighten it down against a section of the shaft that will be inside the shaft bore. Create a fairly deep, (we're not trying to cut through it!), score all the way around the shaft, so that there will be two raised ridges on either side of the score. Reinstall. It should be solidly tight, but not sticky or hang up. If you can't get smooth operation, remove & lightly sand down the ridges, then reinstall & check again. If it's still too tight, repeat the sanding.

If it's still loose after scoring, I imagine you'll know what to do about that.

BTW, the solution to the current TPS problem is replacement. There's no non-destructive way to get the water out.

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  #74  
Old 12-12-2014, 08:07 AM
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Re: jeep surge idle

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Originally Posted by Thunkthoughtless View Post
I've suddenly started having the same problem. It's due to the throttle position sensor getting water inside of it.

My problem suddenly started occurring due to car washes in below freezing temps. Nothing had changed under the hood, so no reason why it should suddenly be starting to collect water. My theory is that washing in freezing weather creates a mist that's either entering the TPS by way of the throttle shaft, or a leaky TPS body. Rain soaked roads are probably creating a similar condition.

I've replaced one TPS already, and just chalked it up to being old and the seams cracked & let in water. The one month old new one just did the same thing tonight. Both came from Napa, so I'm gonna inspect this one a whole lot more thoroughly and perhaps buy a different brand

If you think you got it bad now, wait 'til the water inside it freezes; You'll be limping home because it takes a long time for the engine to deliver enough heat to melt the water inside. Think 3 grand to do 10 mph, because the TPS also controls tranny shifts.

I didn't check before to see if the throttle shaft perhaps has O-rings somewhere that have worn out, but that's a possibility. If not, the throttle shaft can be tightened up by doing the following:

Get a small pipecutter. Tighten it down against a section of the shaft that will be inside the shaft bore. Create a fairly deep, (we're not trying to cut through it!), score all the way around the shaft, so that there will be two raised ridges on either side of the score. Reinstall. It should be solidly tight, but not sticky or hang up. If you can't get smooth operation, remove & lightly sand down the ridges, then reinstall & check again. If it's still too tight, repeat the sanding.

If it's still loose after scoring, I imagine you'll know what to do about that.

BTW, the solution to the current TPS problem is replacement. There's no non-destructive way to get the water out.
But I don't have a tps. I have a drive by wire throttle body which apparently doesn't have a tps sensor because it's built inside the throttle body. What year is yours?
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  #75  
Old 12-12-2014, 09:28 AM
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Re: jeep surge idle

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Originally Posted by Jeff1119 View Post
But I don't have a tps. I have a drive by wire throttle body which apparently doesn't have a tps sensor because it's built inside the throttle body. What year is yours?
'03........

And disregard the throttle shaft repair; The airflow of a loose throttle shaft would pull *away from* the TPS, (which you don't have).

I'm not familiar with your setup, so can't be of any actual help on that one.
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  #76  
Old 12-17-2014, 05:38 PM
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Re: jeep surge idle

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Originally Posted by Thunkthoughtless View Post
'03........

And disregard the throttle shaft repair; The airflow of a loose throttle shaft would pull *away from* the TPS, (which you don't have).

I'm not familiar with your setup, so can't be of any actual help on that one.
its ok thanks anyways
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  #77  
Old 12-21-2014, 01:12 PM
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Re: jeep surge idle

Does anybody think ignition coils could cause this surge to happen during or after it rains? I've been researching on Google and other cars had this problem with ignition coils getting wet. Nothing about a jeep though and mine are dry but they said on these other car forums that moisture can get into cracks and lead to a rough idle or as I'm having in the rain: a "surge"
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  #78  
Old 12-22-2014, 03:48 PM
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Re: jeep surge idle

Update: Update: found this strange open connector near the rear passenger side wheel. There's no boot on it to protect it from rain. I have no clue what it even goes to but it's just siting there with nothing over it. I put a plastic bag over it and zip tied it for now. Seems like water flying into it from that wheel could be a problem when driving?

P.s. Not sure if anyone still cares about this problem, but I'm just posting information as I go in case anyone wants to chime in lol.
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  #79  
Old 12-23-2014, 05:19 AM
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Re: jeep surge idle

Quote:
Originally Posted by Jeff1119 View Post
Does anybody think ignition coils could cause this surge to happen during or after it rains? I've been researching on Google and other cars had this problem with ignition coils getting wet. Nothing about a jeep though and mine are dry but they said on these other car forums that moisture can get into cracks and lead to a rough idle or as I'm having in the rain: a "surge"
Yes, moisture can have influence on ignition system parts. The high voltages induced to make the sparks, can sometimes find a more easy way to ground via moisture in cracks then via the airgap between the plug electrodes. This can result in a weaker spark to no spark at the plug.
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  #80  
Old 12-23-2014, 09:23 AM
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Re: jeep surge idle

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Originally Posted by Frango100 View Post
Yes, moisture can have influence on ignition system parts. The high voltages induced to make the sparks, can sometimes find a more easy way to ground via moisture in cracks then via the airgap between the plug electrodes. This can result in a weaker spark to no spark at the plug.
Thanks for the input! Got new coils coming in. Also would you happen to know what that connector is in my last post?
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  #81  
Old 12-23-2014, 12:31 PM
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Re: jeep surge idle

No, no idea where this connector is for. Can be for an component which option your jeep doesn't have.
By the way, did you already try to put a scanner on the jeep which shows live data, so that you can monitor the throttle position. Eventhough your jeep has no TPS, it must have a pedal position sensor and a feedback sensor from the actual throttle position. Maybe by monitoring them, you can see if one of the inputs is causing your idle issue. Probably that the android app torque can help.
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  #82  
Old 12-23-2014, 12:50 PM
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Re: jeep surge idle

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Originally Posted by Frango100 View Post
No, no idea where this connector is for. Can be for an component which option your jeep doesn't have.
By the way, did you already try to put a scanner on the jeep which shows live data, so that you can monitor the throttle position. Eventhough your jeep has no TPS, it must have a pedal position sensor and a feedback sensor from the actual throttle position. Maybe by monitoring them, you can see if one of the inputs is causing your idle issue. Probably that the android app torque can help.
Guess so. Well covered up that connection well. Really should have a boot on it or something. Anyways I'm not big on using Bluetooth code readers due to hearing some reviews of them causing problems with people's cars. I can use my regular scan tool and hook it up. See if it tells me that info. What should I be looking for though? When I see that data, what numbers are considered good and what are considered bad?
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  #83  
Old 12-23-2014, 01:04 PM
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Re: jeep surge idle

Not sure how they call the things on the drive by wire system. I would look for a pedal position sensor and maybe a throttle position sensor.
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  #84  
Old 12-25-2014, 08:02 PM
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Re: jeep surge idle

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Originally Posted by Frango100 View Post
Not sure how they call the things on the drive by wire system. I would look for a pedal position sensor and maybe a throttle position sensor.
I'm starting to think theres a short in one of the o2 sensor connections if it only does it when it rains. Some members on jeepfourm gave me some info on it. gonna check the connections out tomorrow
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