Topic: Yet MORE coil problems...

[jfrabat]

Honestly speaking, I think I have a short somewhere in the stock wiring.  Not only from this, but when I turn on my headlights, the right turn indicator lights up as well, which is another hint in this direction.  I already installed a base with a second coil in there so that if I need to swap coils on the way to Panama I can do it quickly without tools (the coil will most likely not make it all the way), and I already made an appointment at a shop to have them check the whole wiring on the Jeep to try to get to the bottom of this issue...

So far I have changed:
Coil
Plug wires
Rotors and cap
Coil wire plug
ECU

Still to try are changing the coil location (which I will do once the coil on the engine burns out, to rule out heat as the culprit) and plugging in the ballast resistor (the resistor is already installed on the mount I made for the second coil, but it is not wired up; I am still looking for an extension for that one).

[sharpxmen]

Honestly speaking, I think I have a short somewhere in the stock wiring.  Not only from this, but when I turn on my headlights, the right turn indicator lights up as well, which is another hint in this direction. 

should both turn on, so the other one is burned or has a ground problem.

[jfrabat]

should both turn on, so the other one is burned or has a ground problem.

Sorry, I meant the indicator on the dash...  Not the actual light outside.  When I signal to the right, and then turn off the signal, the intensity of the light goes down, and the builds.up again.

[neale_rs]

That delayed intensity build up sounds really strange.  It seems your YJ does have some wiring problems.

[Jeffy]

Honestly speaking, I think I have a short somewhere in the stock wiring.  Not only from this, but when I turn on my headlights, the right turn indicator lights up as well, which is another hint in this direction.  I already installed a base with a second coil in there so that if I need to swap coils on the way to Panama I can do it quickly without tools (the coil will most likely not make it all the way), and I already made an appointment at a shop to have them check the whole wiring on the Jeep to try to get to the bottom of this issue...

So far I have changed:
Coil
Plug wires
Rotors and cap
Coil wire plug
ECU

Still to try are changing the coil location (which I will do once the coil on the engine burns out, to rule out heat as the culprit) and plugging in the ballast resistor (the resistor is already installed on the mount I made for the second coil, but it is not wired up; I am still looking for an extension for that one).

With the way it's burning up the plugs, it's most likely not a short.  It's an partially open circuit.  I'm gonna say it's a ground issue with your lights.  I'm not sure about the coil but it could be.  Open grounds can do weird things.

[sharpxmen]

did you try replacing the blinker relay? i had some issues with those lights in the dash (not like yours though) and replacing that round relay fixed my problem, not sure if it's the same but it was something like $4 so imo for that much it's worth a shot.

[jfrabat]

With the way it's burning up the plugs, it's most likely not a short.  It's an partially open circuit.  I'm gonna say it's a ground issue with your lights.  I'm not sure about the coil but it could be.  Open grounds can do weird things.

I was thinking among the same lines...  Anyway, the shop says they can check the wiring in 2 days, so I will have them check it out.  It's better than spending $2K and a month to install a complete new wiring kit, that's for sure!

[grumpygy]

So anything yet.

[jfrabat]

Well, this time the Jeep made it all the way to Panama without issues.  I also used it yesterday and today, and no burnt coils yet, but it did come close to stalling when taking off the line.  I will have the electrical system checked next week anyway, though.

[jfrabat]

Well, had the shop check the entire electrical system, and they could not find a thing (they did not even charge me).  Of course, I have very strong doubts about how well a job they did checking, as I asked them also to adjust the TPS (it is giving me a code when I go full throttle that the voltage is over the range), which is basically loosening 2 torx bolts, measuring the voltage, and tightening again the 2 torx bolts, and they did not do it.  I have to eventually check the ground, as I have my suspicions that this coul dbe the cause (some corrossion there or mud or both).  Anyway, so far, the coil has survived, but the Jeep did do a couple of hiccups on the way to Panama that lead me to suspect that the root cause of the problem is still there.  From this mechanic, my dad took the Jeep to an AC place to check why I have hot air coming in from the heater (their first idea is the same as mine; the door is not closing properly around the heater), so hopefully that will be fixed this week, in time for my business trip to Panama next tuesday.

[sharpxmen]

hmm, there's no adjustment on the tps, so the problem is the tps itself, the wot limiter (is it going past the vertical at wot) or the 5v supply to the tps.

[jfrabat]

hmm, there's no adjustment on the tps, so the problem is the tps itself, the wot limiter (is it going past the vertical at wot) or the 5v supply to the tps.

You have to adjust the position with the screws...  It's in the FSM, IIRC.  I still have to measure the voltage and adjusted; hopefully, I will get to that next tuesday.

[sharpxmen]

You have to adjust the position with the screws...  It's in the FSM, IIRC.  I still have to measure the voltage and adjusted; hopefully, I will get to that next tuesday.

the holes are not oval, they're round with very little room to move the sensor
other ones can be adjusted.

FSM says min 200mV max 4.8V - since it's basically a resistive pot it is related to the input voltage and the position, you can test that with a digital multimeter

[aw12345]

bad ground for tps and map does affect sensor voltage also

[grumpygy]

When I changed my Throttlebody the 1st time I found my TPS was bad and replaced it.  There was no Adjustment to it.