Interesting post about ASD relay.

KJ04 · **Posted:** Tue Apr 28, 2009 11:28 am

http://www.jeepforum.com/forum/showthread.php?t=748667

Jeepjeepster · **Posted:** Tue Apr 28, 2009 3:47 pm

Well thats a good thing to know. Ive read many threads about people having that problem and never did see an answer besides it needing valve springs.

2006KJSPORT4x4 · **Posted:** Tue Apr 28, 2009 10:27 pm

BRILLIANT!!!!!!!!!!

hrogi · **Posted:** Wed Apr 29, 2009 1:48 pm

Just in case you are to lazy to click on the link here is the story..

this has been copy and paste.

Well, here is my story. It all started 4 months ago. engine light and misfire. I did all the obvious, coils, plugs, computer, cleaned injectors, no help. I fought the thing all winter. Problem would come and go. Random misfires (p0300, P030x, P035x), the codes listed at times 12 different codes. They would come and go. The problem would move around. I started getting desperate. The battery was weak, so I changed it thinking it would cause a weak spark. Checked fuel pressure. It was OK. Vacuum leaks. Fixed them all. Nothing helped. Then the other night I was reading the Haynes manual in a completely different section... It mentioned the one thing that I had missed. (read on...)

It was late, so I called it quits for the night. I went to the shower smelling like I has spilled the gas can on myself. I was so frusterated. I know I am not that smart, but I AM smarter than a danged car... I thought to myself. So I started thinking about it. What could cause a random problem that comes and goes? It has to be something COMMON to all the COILS. I started thinking about how the voltage gets to the coils to cause the spark. Battery positive to fuse to ASD relay to coil positive to PMC to ground... what??? ASD RELAY?!?!? Here is the ONE THING that is common to all coils, and if it is weak or the contact is worn can cause a weak spark by not supplying enough power to the coils... It is not mentioned as an integral part of the ignition circuit. It is not out in the open where it tcan be easily seen. Out of sight out of mind. So I changed it. The misfire immediately went away. Within 2 hours the light went out. It has more power than it had in ages. Mileage better, too (thanks to the fixed vaccuum leaks no doubt.). CHEAP FIX that costed me a small fortune!!! ASD relay in the engine compartment fuse box. Tell all your friends!!! ASD RELAY!!!!

DryBones · **Posted:** Wed Apr 29, 2009 2:45 pm

did anybody read all the posts on that thread??? he came back and said the problem returned! where is the fix?

tjkj2002 · **Posted:** Wed Apr 29, 2009 3:21 pm

DryBones wrote:

did anybody read all the posts on that thread??? he came back and said the problem returned! where is the fix?

There wasn't one,a relay is either bad or good.If the ASD relay had a hiccup the engine would have died or gotten a misfire code for each cylinder.

Jeep Dawg · **Posted:** Wed Apr 29, 2009 3:41 pm

tjkj2002 wrote:

DryBones wrote:

did anybody read all the posts on that thread??? he came back and said the problem returned! where is the fix?

There wasn't one,a relay is either bad or good.If the ASD relay had a hiccup the engine would have died or gotten a misfire code for each cylinder.

I understand that if it is bad/going bad it is either working or it is dead!

But is there a small chance that the relay could have bad contacts and it works some times?
I know in HVAC, some time a 2 pole contactor could become pitted over time with the constant sparking. At times the contactor would stick and or just have a bad enough pit spot that it wont make enough spart to stay contacted.....
Relays can work and stop some times.

I wonder if this is what my problem could be. I still have not fixed my issue yet.

2006KJSPORT4x4 · **Posted:** Wed Apr 29, 2009 4:06 pm

Ahhh, boo for me being lazy late at night....well it still might be a partial fix perhaps it seems?

tjkj2002 · **Posted:** Wed Apr 29, 2009 6:02 pm

Jeep Dawg wrote:

tjkj2002 wrote:

DryBones wrote:

did anybody read all the posts on that thread??? he came back and said the problem returned! where is the fix?

There wasn't one,a relay is either bad or good.If the ASD relay had a hiccup the engine would have died or gotten a misfire code for each cylinder.

I understand that if it is bad/going bad it is either working or it is dead!

But is there a small chance that the relay could have bad contacts and it works some times?
I know in HVAC, some time a 2 pole contactor could become pitted over time with the constant sparking. At times the contactor would stick and or just have a bad enough pit spot that it wont make enough spart to stay contacted.....
Relays can work and stop some times.

I wonder if this is what my problem could be. I still have not fixed my issue yet.

It could but if that relay would act funny the engine would die since that relay is what shuts down the engine when you turn the key off.It works or it doesn't,if it works the engine runs(with no other problems) and if it doesn't the engine does not run at all since no fuel/spark gets to the engine at all.

Jeep Dawg · **Posted:** Wed Apr 29, 2009 7:45 pm

tjkj2002 wrote:

Jeep Dawg wrote:

tjkj2002 wrote:

DryBones wrote:

did anybody read all the posts on that thread??? he came back and said the problem returned! where is the fix?

There wasn't one,a relay is either bad or good.If the ASD relay had a hiccup the engine would have died or gotten a misfire code for each cylinder.

I understand that if it is bad/going bad it is either working or it is dead!

But is there a small chance that the relay could have bad contacts and it works some times?
I know in HVAC, some time a 2 pole contactor could become pitted over time with the constant sparking. At times the contactor would stick and or just have a bad enough pit spot that it wont make enough spart to stay contacted.....
Relays can work and stop some times.

I wonder if this is what my problem could be. I still have not fixed my issue yet.

It could but if that relay would act funny the engine would die since that relay is what shuts down the engine when you turn the key off.It works or it doesn't,if it works the engine runs(with no other problems) and if it doesn't the engine does not run at all since no fuel/spark gets to the engine at all.

make sence to me...

Interesting post about ASD relay.

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