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Coolant residue in spark plug tube

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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JoeyG85Z
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JoeyG85Z

Coolant residue in spark plug tube

Post by JoeyG85Z » Fri Jun 21, 2019 12:08 pm

A few days ago by 94 850 Turbo tossed the CEL. The codes indicated it was running rich and that cylinder three was misfiring, in addition to the P1310 random misfire. It was about 15k miles since I swapped out the plugs so I figured what the hell. Everything looked ok except cylinder four. The contacts were fine, but the upper electrode, wire boot and the inside of the tube has a white powdery residue. It really looks like dried coolant but I can't figure out how it could have gotten there. I wouldn't think a failed head gasket would result in coolant getting there, especially without fouling the plug.

In addition, for the past few months I've been noticing a coolant smell after I come off of wide open throttle and the turbo lets off if my windows are open.

I did the test to detect combustion gasses in the coolant and it didn't show any.

So, am I going to be replacing the head gasket soon?



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abscate
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abscate

Re: Coolant residue in spark plug tube

Post by abscate » Fri Jun 21, 2019 1:09 pm

I would guess no on the head gasket. White residue could be many things other than coolant. Are you losing coolant at any noticeable rate?


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Klausc
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Klausc

Re: Coolant residue in spark plug tube

Post by Klausc » Fri Jun 21, 2019 2:04 pm

JoeyG85Z wrote:
Fri Jun 21, 2019 12:08 pm

In addition, for the past few months I've been noticing a coolant smell after I come off of wide open throttle and the turbo lets off if my windows are open.

I did the test to detect combustion gasses in the coolant and it didn't show any.

So, am I going to be replacing the head gasket soon?
Head sounds OK. That white stuff could be a plug wire shorting.

Check the coolant tube that goes to the turbo, it can leak down to the exhaust and cause a stink.


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Re: Coolant residue in spark plug tube

Post by satya31 » Sat Jun 22, 2019 3:02 am

Informative thread..!!!



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