[xj40] 93 XJ40 billows of white smoke out the exhaust

In reply to a message from Jagbo sent Wed 2 Feb 2011:

Short answer - No.

[I’ve had that very thing happen on the only two American cars I have owned - a very long time ago]

I think your first guess is probably correct - a blown head
gasket.–
The original message included these comments:

the car to leave, it started to run with a severe misfire
and huge amounts of white smoke out the back. Since it was
American auto transmissions, somethimes the downshift module
mechanism on the transmission fails and allows ATF to get to
the intake manifold and create similar billowing white
clouds out the exhaust. Does my Jaguar have such a device
and have a similar malfunction? Never a dull moment with
Jaguar.


Bryan N, '91 Sovereign 4.0 L, RHD
Cambridgeshire, United Kingdom
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In reply to a message from Jagbo sent Wed 2 Feb 2011:

Almost the same thing happened to me about two weeks ago. It
certainly sounds like a head gasket problem. Check the dipstick for
antifreeze and als pull the plugs and turn the engine over to see
if antifreeze comes out of the cylinder.–
92’ SOV & 94
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In reply to a message from Jagbo sent Wed 2 Feb 2011:

Hi Jagbo,

You almost certainly have a blown head gasket. I’ve been
through this three times, once with my '88 and twice with my
'93 (about 90K miles apart). If by ‘‘stop gap water seal
heroic measure’’ you mean some sort of stop-leak additive for
the coolant system, it is highly unlikely it could restore
your engine to proper performance, and the possible
downsides are numerous, including a plugged heater core.
Best to bite the bullet, confirm it’s the head gasket, get
the parts on order and clear a weekend to do the job.

The reason coolant had been forced out of the reservoir was
probably due to pressurization from cylinder compression
leaking past the head gasket into the coolant system.

If this is the first time you’ve done the head gasket, be
sure you get the proper head gasket set for your model year,
and be sure the head gasket has the improved seal around the
little oil port positioned directly above the distributor.
Now is a great time to replace the heater control valve, oil
pressure sender, and any other component that is concealed
by the intake manifold, including all the little
coolant/heater hoses and vacuum lines under the manifold,
etc. How’s your starter? That’s another component more
easily accessed with the intake manifold disconnected.–
The original message included these comments:

the car to leave, it started to run with a severe misfire
and huge amounts of white smoke out the back. Since it was
running somewhat and I was not far from home, I decided to
go for it. Got home, the car still running barely. Shutting
it down to gather my wits, one thing came to mind, #1: blown
head gasket! I opened the hood and saw antifreeze splashed
around the resevoir tank; I tried to open the tank carefully


Don B : '93 Vanden Plas : (ex-'88 Sovereign)
Franklin, TN, United States
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