I was talking with my sister yesterday and she mentioned that her 100,000-mile 1999 Corolla was emitting white smoke. I'm figuring it's the head gasket and suggested she test it with a combustion leak tester. I'd like to recommend one to her so she can inexpensively do the test herself ... any brand or model that you'd suggest?
Combustion leak tester, white smoke from Corolla
- Thread starter Shel_B
- Start date
Shel, just have her go to Autozone/Advance Auto/O'Reilly's and get the free loaner tool. You just have to leave a fully refundable deposit and it would be courteous to purchase the consumable test fluid from the store instead of online (e.g., Amazon, eBay, etc.).
AUTOZONE Loaner Tool
You can typically smell the coolant in the exhaust. It’s not going to kill you for a quick sniff.
Auto zone has one in their loan a tool program.
That liquid combustion tester is next to worthless. I would use either a gas analyzer in the overflow tank, or pressure test the cooling system and pull the plugs out. You may even find it by pulling the plugs and see which one is steam cleaned.
With the weather the Bay Area is having, my guess is that it is just water vapor. If it doesn't smell of coolant... 
If it's not missing, overheating or using coolant, I would just keep driving it. You can give it a try if you wish,
https://www.amazon.com/Lisle-75500-Combustion-Leak-Detector/dp/B0007ZDRUI/ref=
but Wes just made a video showing how unreliable they are.
https://www.amazon.com/Lisle-75500-Combustion-Leak-Detector/dp/B0007ZDRUI/ref=
but Wes just made a video showing how unreliable they are.
They are fairly reliable on gasoline engines if used correctly.
This. Pulling the plugs while the engine is warm with pressure on the cooling system and have someone spin the engine over. The cylinder getting coolant will blow it out as a mist and/or steam.
I must admit I have near zero experience with them but I just watched a Watch Wes Work -- albeit on a diesel -- which seems to strongly support this.
I just ASSumed they work well but lots of anecdotal that they're a waste of time (I reco skeptics read the vid comments, too)
My preferred method is tying into the system and running a gauge into the cabin and drive it looking for pressure spikes on acceleration or total system overpressurization, but the other ways I mentioned will work too. But my preferred method seems to be most effective finding combustion gas into cooling system only leaks.
Is there a certain section of the cooling system that tends to work best for this?
most degas bottles (pressurized) have small hoses going to the bottle. I usually tie into those. If not I tie into the smallest hose possible on the system. I make my own adapters.
Can you give some info on what analyzer? Amazon has a bunch starting at $30, before I buy one would the cheap ones be sufficient? For myself, not a pro.
I have a Northstar losing coolant but liquid test is negative, don't see a leak. Orange coolant (it has been replaced about 5 years ago) smells funky. I've done HG's on them before but certainly don't look forward to it.
I wouldn’t use any liquid tester. I’d put the piston at TDC compression and apply shop air into the cylinder and look for bubbles in the radiator.
A seat of the pants way to tell if the head gasket is bad is to get the engine up to full temperature and then park it over night so that the engine is at the ambient temperature. Pop the hood and squeeze the upper radiator hose. If the hose is soft and compresses easily the head gasket is likely ok. If it's had it's likely the head gasket is bad.
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