[xj40] Smoke/No Smoke, Please Help

1993 XJ6, 128000mi, Bought this 93 xj6 that was driven
regularly, Then garaged for a year. I did some needed work,
Rotors, Brakes, Batt & Alt, Changed the oil(castrol 10w30
high mileage) and oil filter. I have started it regularly,
Starts EVERY time, usually with a good puff of bluish smoke,
Drove it around the block for the first time today, No Check
Engine Light,No Error Codes, Billowing smoke upon
acceleration, Parked it for about a half hour, Gave it
another ride around the block, Not A Spot of Smoke,Check
Engine Light now on & Fuel Fail #44 with key on, Not
running, Smoking when parked, Oil gauge fluctuating & oil
smoking under the hood at the exhaust header. Logically, Im
thinking, how could it blow smoke one ride, NOTHING the
next, I just went out & started it again, NO Smoke, Then
Very Light smoking & Oil Gauge fluctuating between 2 & 4, If
it had a blown gasket, Wouldn’t the car have been billowing
smoke the second ride same as the first ??? I would love to
drive this car, It drives nice & sounds smooth, Possibly a
sensor ? or am I fighting a losing battle, A friend
suggested that because it was sitting for a while, It just
needs to be driven and blown out a bit ???
Any Help would be greatly welcome.–
shoeboy
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In reply to a message from shoeboy sent Sun 21 Aug 2011:

Shoeboy…

Hopeing a car will fix itself is a lot like throwing a dull drill
bit in a drawer and hopeing it will work better the next time you
use it.

An initial amount of smoke (out of the tail pipe, not under the
hood) only on startup is a classic symptom of worn valve
guides/seals. When the car is sitting for a while a small amount
of oil runs down the valve stems into the combustion chamber and
gets burned out on start up producing the smoke.

If your engine is continually smoking then it’s most likely your
oil control rings on the pistons.

Best bet is to perform a compression check. Run the check once
dry and then squirt a little amount of oil in the spark plug hole
and do it again. A rise in compression after adding the oil
indicated worn rings.

If the compression is low and doesn’t increase with the oil you
have a valve problem or blown head gasket.–
Groove
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In reply to a message from shoeboy sent Sun 21 Aug 2011:

Bluish smoke on start-up would suggest worn exhaust valve
guides and deteriorating exhaust valve stem seals allowing
engine oil to drain in to the cylinders after engine
shut-down. Nothing to worry about in the greater scheme of
things!

That ‘billowing smoke’ on acceleration - could it be black
smoke indicating a grossly over-rich fuel/air mixture (hence
the FF44)?

Have you changed the air filter? Critters have been known to
build nests in the intake ducting on cars which have been
laid-up for a while to cause an over-rich mixture!

Have you checked that the vacuum line to the fuel pressure
regulator does not show any signs of fuel ingestion
(indicating a failed diaphragm in the FPR)?

The oil pressure gauge fluctuations may be entirely
coincidental and due to (the usual) failing oil pressure
transducer.

Check also the crankcase ventilation system (PCV) and
throttle body for cleanliness. It could be that the PCV is
blocked causing oil mist to be forced out of the cam cover
on to the exhaust - hence the smoke in the engine bay.–
The original message included these comments:

1993 XJ6, 128000mi, Bought this 93 xj6 that was driven
regularly, Then garaged for a year. I did some needed work,


Bryan N, '91 Sovereign 4.0 L, RHD
Cambridgeshire, United Kingdom
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A blue puff at startup is a sign of leaking valve seals. Not something
critical at this point.
Oil seeps down past the valve while sitting and burns off instantly at
starting.

If you are smoking under the hood as you say then its just a leak onto the
manifold.
Most likely a very simple thing like the valve cover gasket. Smokes when
oil drips onto the hot manifold.

When you say the oil guage is fluctuating what do you mean? Is it
fluctuating when at a constant RPM?
Remember if you have a proper guage/sending unit the pressure normally
changes with RPM. If its is
fluctuating even at a steady RPM the most likely suspect is the guage
sending unit. True oil issues are rare.

When you get clouds of smoke while driving is it coming from the exhaust or
engine bay?
If its just coming from then engine bay (and remember smoke from up there
may come out from under the back of the car when on the road) then you just
have to fix the leaks. If its coming out of the exhaust then you may have
other issues.

However to me a drive around the block is no where adequate. When a car sits
it accumulates a lot of moisture in the engine and the exhaust.
The car needs to get up to full operating temperature and remain their for
awhile to clean things out. To me that means a 30 minute drive or more.
If its smoking to badly from leaks under the hood to do that then I would
suggest they need fixing first.----- Original Message -----
From: “shoeboy” trapperpoint@roadrunner.com
To: xj40@jag-lovers.org
Sent: Sunday, August 21, 2011 11:34 AM
Subject: [xj40] Smoke/No Smoke, Please Help

1993 XJ6, 128000mi, Bought this 93 xj6 that was driven
regularly, Then garaged for a year. I did some needed work,
Rotors, Brakes, Batt & Alt, Changed the oil(castrol 10w30
high mileage) and oil filter. I have started it regularly,
Starts EVERY time, usually with a good puff of bluish smoke,
Drove it around the block for the first time today, No Check
Engine Light,No Error Codes, Billowing smoke upon
acceleration, Parked it for about a half hour, Gave it
another ride around the block, Not A Spot of Smoke,Check
Engine Light now on & Fuel Fail #44 with key on, Not
running, Smoking when parked, Oil gauge fluctuating & oil
smoking under the hood at the exhaust header. Logically, Im
thinking, how could it blow smoke one ride, NOTHING the
next, I just went out & started it again, NO Smoke, Then
Very Light smoking & Oil Gauge fluctuating between 2 & 4, If
it had a blown gasket, Wouldn’t the car have been billowing
smoke the second ride same as the first ??? I would love to
drive this car, It drives nice & sounds smooth, Possibly a
sensor ? or am I fighting a losing battle, A friend
suggested that because it was sitting for a while, It just
needs to be driven and blown out a bit ???
Any Help would be greatly welcome.

shoeboy
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Line Books and more !

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In reply to a message from shoeboy sent Sun 21 Aug 2011:

I see you are in the US, so there is a product that will help with
the valve seals which have dried out due the period of storage. It
is available at any auto supply store. Buy a good brand name and
add it to your oil. These products do work and are sold under the
name of 'No Smoke. John.–
John. Walsh. Purrrrr 89 vdp
bowmanville ontario, Canada
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