Cylinder compression

PDOG88

MEMBER
2000 TOYOTA COROLLA
1.8L
4 CYL
214,000 MILES

I did a compression on the car listed above. I have no start. But cranks. Did a compression test, found that one and two has no reading. Three and four has 125 psi. What can that mean? Camshaft. Timing chain or belt or just two bad pistons at the same time?

3 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good evening.

One and two are next to each other so it could be a head gasket.
The sure way to tell is to do a leak down test on each cylinder. That is when you inject shop air into the cylinder and watch for the air leak. It will either be from the exhaust, air filter or oil fill.
If it is a head gasket it will blow air out of number two cylinder while checking number one cylinder.

Roy

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Thursday, March 8th, 2018 AT 4:25 PM

PDOG88

MEMBER
2 POSTS

Thanks, that is worth a try, But the engine should do something to try and start. I do not see any coolant loss or in the plugs. Would A head gasket blown then just shut down?
Sounds about right, with all other test are okay. Fuel, spark, spark signal new main relay, etc.
Thanks, pdog88

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Thursday, March 8th, 2018 AT 5:13 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Yes, it is only a four cylinder and you have taken fifty percent of the engine power. It may not even try to start at this point.

Do the test and see what the results give you.

Roy

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Thursday, March 8th, 2018 AT 5:18 PM