924Board.org

[chris79]

I have new problem with my 924.

The car was almost perfect and I did not make any changes, but engine since yesterday run bad.

When I start engine I see a white smoke, first I suspect head gasket, but water level is not changed.

I hear continuous bursts from the exhaust and maximum speed is 160 km/h.

I recently had this problem only once, I thought the problem was the leakage current, then I have shield battery, but the problem has come back.
All parts out of engine are new or restored.

Do you have suggestions?

[jason c]

[leadfoot]

remove your spark plugs and check them...
if wet = head/block cracked or head gasket failure
if black = fuel too rich
if white = too lean

take and post pictures of results...
Stu
_________________
1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

[chris79]

Really block or head cracked? :-O
Ahahah jasonc, I try first with hammer at this point

[jason c]

An easy quick check for a blown head gasket where the leak is between the cylinder and coolant passage is to: with the engine cold, run it for approximately 30 seconds & shut it off. Open the coolant tank cap & listen for pressure to escape.

[chris79]

Ok I made this test and I will update.

For this moment my results are:

oil level not changed;
water level not changed;

but...

water is dirty and I see possible emulsion of water and oil, as you can see:

http://lh6.googleusercontent.com/-EceC9AzTk9U/VQ6amvAEmhI/AAAAAAAAAIE/CB5WJggoy9E/w984-h553-no/a2046f93-4e8c-4057-a9dc-c74d0b7c496b



spark:


http://lh5.googleusercontent.com/-U43uKyTgj8c/VQ6amiKvcyI/AAAAAAAAAIE/tyl-X6YC3FM/w984-h553-no/8ab62cbe-87aa-4750-9736-57d46fbf61bc

[chris79]

Have you not suggestions?

[Paul]

Possible blown head gasket, do a compression test next.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

[leadfoot]

+1
_________________
1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

[chris79]

Ok I made compression test, but White spark?
Co was set one month ago by mechanic.

[leadfoot]

what were the psi readings for each cylinder?
_________________
1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

[chris79]

I have not instrument, I have to made it.

But white spark and white smoke at startup can not lied to lean mixture ?
Even if I have not change co..

[Raceboy]

If you have oil in the water it is 99.99% blown head gasket or cracked head.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

[chris79]

It's possibile to know if problem is block, head or head gasket before open engine?

[Raceboy]

It is 99.99% not the block (these are strong) but head or head gasket.

But there is no way to determine it before pulling the head. And you need to pull it anyway to fix it. It is a one hour job if you know what you are doing.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche