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Old 07-20-2019, 11:38 AM #1
Antznyopantz Antznyopantz is offline
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Compression Test Results: Mantain or Replace Engine?

Performed a compression test to assess the health of my 98's 3.4.

Here are the numbers in the same configuration they occur on the engine. The bottom numbers are nearest the radiator and cylinder numbers are in parentheses.

183 (5) (6) 200
200 (3) (4) 150
205 (1) (2) 205

I believe spec is 178+ with no more than 14 psi difference between cylinders. Obviously number 4 is struggling. Number 5 isn't far behind it.

It has 404,xxx miles on it - is my daily driver - and runs ok.

I am about to take a road trip to Lake Tahoe and considering doing the maintenance on this one (water pump, tune up, radiator, etc) - or renting a car for the road trip and replacing the engine when I return (I've got one with 180k on hand - just no time to do a switch before leaving).

Informed opinions please. Think this thing has another 120k in to justify redoing the water pump? See if I can't make half a million? Or replace when I can?

Thanks!
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Old 07-20-2019, 02:41 PM #2
19963.4lsr5 19963.4lsr5 is offline
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That 150 could be a valve adjustment but with your milage probably not.

Look at it this way, 150 is better than 120. Which is when I call it quits on an engine.


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Old 07-20-2019, 02:49 PM #3
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My last engine registered 60 PSI on cylinder 6 and ran like a champ. Low compression is just loss of power, it'll run just fine and be safe. After 400k miles, those numbers are actually quite amazing. Drive confidently.

You can check the valve clearances easy enough during your timing belt job to see if you can help it out a little.
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Old 07-20-2019, 10:07 PM #4
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As long as you can pass smog you are ok it depends on how the rest of the Runner is weather to put more money into it. If you do a wet compression test with a couple of squirts from a oil squirt can motor oil or ATF works just fine and see how much the compression goes up. If that low one only comes up a little then you have a leaky valve that would require a head gasket job with a valve grind at a machine shop or a lapping of the valves I vote for the machine shop about 350.00 they will also adjust valve lash. If the compression do move up alot them the rings are worn. If it's valves another 300.00 for a head gasket set and head bolts check rockauto for pricing If you do the water pump you are 1/3 of the way.
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Old 07-21-2019, 04:27 PM #5
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Compression Test Results Mantain or Replace Engine

I know there isnt a specific number of compression test figures, but one of my friends did full general repair including bottom end honing, changing pistons rings etc and he dialled 220 also here some of guys posted around 220. The thing is I want to do a remap my 743 cams on March, so I want to keep my engine in mint state before it.
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