The 3.9L kills ignition coils like a serial killer? Since the 3.9 is based on the Jag 4.0, does that engine have the same issue or is it that when Ford decided to shorten the stroke, it royally screwed the engine up? Just curious.
Has anyone ever asked or actually figured out why...
- Thread starter LSter
- Start date
joegr
Dedicated LVC Member
Ford says that it is due "high voltage break down of the epoxy." This implies that they didn't use the correct epoxy formula. One would think this would be corrected by now.
A popular theory is that the issue is heat from the engine. This seems possible to me.
AFAIK, the S-type had the same coil issues. Before the S-type, Jaguar was famously unreliable. Even with the coil failures, it was probably an improvement.
A popular theory is that the issue is heat from the engine. This seems possible to me.
AFAIK, the S-type had the same coil issues. Before the S-type, Jaguar was famously unreliable. Even with the coil failures, it was probably an improvement.
V
If the issue is heat, might leaving the coil covers off help?
If the issue is heat, might leaving the coil covers off help?
1LoudLS
Dedicated LVC Member
this lol
1LoudLS
Dedicated LVC Member
not unless there is cool air flowing over them.
which there is not a whole lot of under the hood.
It has to be better than nothing. More air/space to dissipate the heat. Vs trapping the heat so close to the coils, especially considering how close they are to hottest parts of the motor.
Unless I hear a good reason not to if/when I replace the coils I may consider giving it a shot.
1LoudLS
Dedicated LVC Member
except for there is a system inside the motor and heads that cool it down, where as the headers can just radiate all of their heat into the engine bay, not to mention that system that cools the engine off, transfers that heat right to the air that is coming into the engine bay.
i would also say that the area around the headers, is a lot hotter then the top of the heads, the heads have coolant to transfer heat away, the exhaust doesn't.
for starters, LS's have been known to leak water right onto the top of the motor. but many have left them off and have been fine.
for me, personally, I'm sticking with the assumption that the guy that designed the motor and put those there, knew more about it than I do...
The coolant leaking onto the motor is plausible....but sometimes the guys that design the motors can't forsee the unintended consequences of everything. If they could I probably never would never have had a reason to join this forum lol.
G-RELL
FULLY DIPPED LS
i covered my coils in aerogel... its a little expensive, but runs like a champ.