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Unread 05-07-2015, 02:04 PM   #1
CatfishsLJ
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Idle issues

I have a 2004 unlimited, when driving while going a steady speed I sometimes get a push of power and accelerate even though I didn't hit the gas at all, also when I am driving and let off the gas to go brake or turn my RPMs drop to almost 0 (I have stalled twice my friend helping me diagnose the problem stalled it 3 times). It will drop fast to around 100 RPM and go back up to the normal idle RPM of 700/800 around there. I could use some help please.

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Unread 05-08-2015, 02:29 AM   #2
CatfishsLJ
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Guys please help me I am at a dead end
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Unread 05-08-2015, 02:40 AM   #3
Knuckelhead
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Do you have a CEL/MIL showing?...
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Unread 05-08-2015, 03:20 PM   #4
CatfishsLJ
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Quote:
Originally Posted by Knuckelhead View Post
Do you have a CEL/MIL showing?...
CEL says bad thortal position sensor high circuit I replaced the TPS gave it a test drive was still stalking on low rpms under 1500 but now I think it might be transmission related but I don't know much.
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Unread 05-08-2015, 04:43 PM   #5
chevy2169
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What is the code?
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Followed by meteor showers and tidal waves.
Followed by faultlines that cannot sit still.
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Unread 05-09-2015, 12:38 AM   #6
CatfishsLJ
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Originally Posted by chevy2169 View Post
What is the code?
P0123 and a random Evap code that's been on it since I've gotten it
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Unread 05-10-2015, 09:20 AM   #7
chevy2169
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Quote:
Originally Posted by CatfishsLJ
P0123 and a random Evap code that's been on it since I've gotten it
1. Check the Throttle Position Sensor (TPS). Unplug the TPS connector and check the signal wire for 5 volts.

2. If OK, jumper the signal wire to the sensor ground and it should go to near 0 volts if the sensor ground is good.

3. Check the 5 volt reference wire.

4. If the wiring is OK, replace the TPS.
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Followed by meteor showers and tidal waves.
Followed by faultlines that cannot sit still.
Followed by millions of dumbfounded dip****s.
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Unread 05-14-2015, 06:46 AM   #8
CatfishsLJ
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Quote:
Originally Posted by chevy2169 View Post
Quote:
Originally Posted by CatfishsLJ
P0123 and a random Evap code that's been on it since I've gotten it
1. Check the Throttle Position Sensor (TPS). Unplug the TPS connector and check the signal wire for 5 volts.

2. If OK, jumper the signal wire to the sensor ground and it should go to near 0 volts if the sensor ground is good.

3. Check the 5 volt reference wire.

4. If the wiring is OK, replace the TPS.
The TPS signal wire is getting 5 volts but it's flashing (not steady current) (also reading wires awesome my sort of task) I don't see any damage on connectors no reason for a wire to break but it is definitely shorting. What now?
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Unread 05-14-2015, 10:41 AM   #9
chevy2169
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Quote:
Originally Posted by CatfishsLJ
The TPS signal wire is getting 5 volts but it's flashing (not steady current) (also reading wires awesome my sort of task) I don't see any damage on connectors no reason for a wire to break but it is definitely shorting. What now?
I believe the signal wire is supposed to pulse. The 5 volt reference wire should be a steady voltage.

You could check voltage drops to be sure. Just check voltage at different positions of the wire.
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Followed by meteor showers and tidal waves.
Followed by faultlines that cannot sit still.
Followed by millions of dumbfounded dip****s.
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Unread 05-14-2015, 08:18 PM   #10
CatfishsLJ
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Quote:
Originally Posted by chevy2169 View Post
Quote:
Originally Posted by CatfishsLJ
The TPS signal wire is getting 5 volts but it's flashing (not steady current) (also reading wires awesome my sort of task) I don't see any damage on connectors no reason for a wire to break but it is definitely shorting. What now?
I believe the signal wire is supposed to pulse. The 5 volt reference wire should be a steady voltage.

You could check voltage drops to be sure. Just check voltage at different positions of the wire.
Just an idea I took it in to a mechanic I know just to get a face to face opinion he read the codes did a diagnosis for me this is what he said, "found two codes p0123, p1596, voltage to TPS is flashing 5 volts, volts will not change even when unplugged. Believe it is a short or ECM problem. Also dirt/mud in ADAL connector (no idea what this is) possible water damage recommend dealer."
I did have this issue after pressure washing the engine block so that's the full story hit me with your inputs
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Unread 05-15-2015, 09:15 AM   #11
chevy2169
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Quote:
Originally Posted by CatfishsLJ
Just an idea I took it in to a mechanic I know just to get a face to face opinion he read the codes did a diagnosis for me this is what he said, "found two codes p0123, p1596, voltage to TPS is flashing 5 volts, volts will not change even when unplugged. Believe it is a short or ECM problem. Also dirt/mud in ADAL connector (no idea what this is) possible water damage recommend dealer." I did have this issue after pressure washing the engine block so that's the full story hit me with your inputs
Maybe the PCM/ECM ended up getting wet when you sprayed the engine. Sometimes time is worth more than money, so you may consider the dealer like your mechanic suggested. They'll find it.
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Followed by meteor showers and tidal waves.
Followed by faultlines that cannot sit still.
Followed by millions of dumbfounded dip****s.
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Unread 05-16-2015, 03:55 AM   #12
CatfishsLJ
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Quote:
Originally Posted by chevy2169 View Post
Quote:
Originally Posted by CatfishsLJ
Just an idea I took it in to a mechanic I know just to get a face to face opinion he read the codes did a diagnosis for me this is what he said, "found two codes p0123, p1596, voltage to TPS is flashing 5 volts, volts will not change even when unplugged. Believe it is a short or ECM problem. Also dirt/mud in ADAL connector (no idea what this is) possible water damage recommend dealer." I did have this issue after pressure washing the engine block so that's the full story hit me with your inputs
Maybe the PCM/ECM ended up getting wet when you sprayed the engine. Sometimes time is worth more than money, so you may consider the dealer like your mechanic suggested. They'll find it.
Thanks man I am out of options so dealer it is I guess
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Unread 05-16-2015, 07:43 PM   #13
ElDuderino762
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Did you unnplug the clockspring and see if it quits?
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Unread 05-27-2015, 05:15 PM   #14
CatfishsLJ
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Quote:
Originally Posted by ElDuderino762 View Post
Did you unnplug the clockspring and see if it quits?
whats the clockspring and how could it stop it? if it does what do I need to change?
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Unread 05-28-2015, 08:15 PM   #15
ElDuderino762
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The clockspring is behind the steering wheel. Take off the plastic around the steering column and disconnect it. I think you can also just unplug the horn relay to test it too, but im not 100% sure on that. It sounds crazy, but that clockspring will short out and backfeed the tps causing the 123 code.
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