Question about 1989 Chevrolet S-10 Blazer

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I have a 2001 2wd chevy blazer with a bad knock and very low compression on two cylinders. Im all the way down the the heads. I will pull them off tomorrow and send them to the machine shop. But can I rebuild the bottom end without pulling the engine? i dont have the means to pull it and I feel like I could jack it up removal all suspension in the way and replace main bearings. Then rod bearings. And of course hone the cylinder and put on some new rings. I would use plasti-gauge of course. This is my first rebuild on an American engine.

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You can do that. I would check cylinder wall taper and ring gap. If the knock is coming from a rod bearing, I would plasti-gauge that journal first to make sure that the crankshaft doesn't need turned. Besides that, you should be ok.

Posted on Oct 24, 2010

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2 Answers

Add too the question below. The knocking is on the top end on the back left cylinder I believe its #3


a knocking noise is usually associated with a spun/burnt bearing ---rod knock which would require lower end rebuild or if cylinder walls are also damaged require new block

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The head on the motor you bought is bad; or the head gasket is leaking; or the rings in the 2 center pistons are bad. 30 lbs is far too low of a compression, and 5 lbs is garbage. They should be closer to 80 or 90 psi and not have more that 5% variance between the cylinders.
The first thing you will have to do is pull the head off and check it. Or you can take it back to the salvage yard you got it from, show them the results from the compression test and either get another motor, or have them refund your money.

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Spark plug wires crosses or timing is too early or octane too low for the higher compression..

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Water in the oil is most likely a head gasket leak-blown head gasket. You will have to pull the cylinder head off and replace the head gasket. If it's a V6 or V8 engine, a compression test will tell you which bank of the engine has the head gasket problem. One cylinder or two cylinders next to each other will have low compression.

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My 1999 Ford windstar acts like its going to die when stopped and dies when pulled from park to reverse...... mechanic just said its caused by the 5th cylinder. What in the cylinder is causing it?


If anything he ment cylinder contribution. # 5 is not contibuting,1999 windstar uses a waste spark system when a cylinder does not contribute it can be from no spark,to that cylinder to low compression. If its spark related spark plugs and wire will be needed . I am also going to say the coil pack why because your going from park to drive to reverse and #5 not contributing it affects #1 also.Now the compression.It cant contribute if the compression is low. If the compression is low you ll need to trouble shoot that area before you go any further.because a tune up cant fix a low compression

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I have a 89 fullsize blazer i was on freeway an the truck lost all power burped an started running temp went 2 about 200 got off freewy did compression test #7 has 0 comp.did i blow the rings out or?please...


low compression in one cylinder usually indicates a bad exhaust valve. Low compression in two adjacent cylinders typically means you have a bad head gasket. Low compression in all cylinders would tell you the rings and cylinders are worn and the engine needs to be overhauled. If compression is low in one or more cylinders, you can isolate the problem to the valves or rings by squirting a little 30 weight motor oil into the cylinder through the spark plug hole and repeating the compression test. The oil temporarily seals the rings. If the readings are higher the second time around, it means the rings and/or cylinder is worn. No change in the compression readings tells you the cylinder has a bad valve. have a good day!

Apr 16, 2011 | 1989 Chevrolet S-10 Blazer

1 Answer

2000 chevy s10 4.3 v6 rough idle skips bad has a like water coming out of the tail pipe and smells like a rotten egg replaced the plus still skips but i think it the spider injection is bad flooding it...


Do a compression check to confirm a blown or leaking head gasket. If the compressions are too far off that will be more indication of a possible head leak or crack in the block.

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1 Answer

Im about to buy a 2002 dodge stratus and there is low compression in 1 of the cylinders but the car doesn't make a knocking sound. What is really wrong with it and how much will it be to repair it?


Low compression in a single cylinder (more than 5-10 points difference than the reset) indicates too much wear in tha cylinder. The issue will either be the rings, valve seats or head gasket. Unless the care is very cheap but otherwise in good shape (where a rebuild or used engine will be worth it), I would keep shopping.

Hope this helps.

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HI. IT DOSN'T MATTER YOU HAVE TO START STRIPPING IT DOWN BECAUSE WHEN YOU HAVE 2 CYLINDERS THAT ARE AT 70 lbs THEY CAN'T FIRE RIGHT. SO WHEN YOU ARE AT A IDLE THOSE 2 ARE DEAD CYLINDERS UNTIL YOU BRING THE RPM's UP AND THEN THEY WILL FIRE. SO START AT THE TOP OF THE MOTOR AND WORK YOUR WAY DOWN. IF IT WAS ME WITH 220,000 ON IT I WOULD TAKE IT OUT ARE DO A MOTOR JOB ON IT. THANKS JIMBO I HOPE THIS HELPS YOU.

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Bad headgaskets or warped cylinder heads Oh god cars cannot take overheating and survive

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