Question about 1999 Buick LeSabre

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How do you know the engine hydrolocked? Did your mechanic tell you?
Hydrolocking occurs when the engine gets filled with a liquid such as oil or water, and because it's not compressible the way air is, it jams up the engine and prevents it from turning. It might bend parts and cause damage if you're not lucky. Generally the spark plugs should be removed and the engine turned to expel the liquid and allow it to turn again. Then you'll have to determine the extent of the damage.
If you changed the thermostat yourself, and in the process, stuck a garden hose down the air intake instead of filling the radiator, you could have filled it with enough water to hydrolock it. Otherwise, it's pretty unusual that a thermostat replacement could cause hydrolocking.

Posted on Dec 31, 2010


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017


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What is liquid locked in the cylinder.

It's when water or coolant gets into the cylinder, causing a hydro-lock condition. Water won't compress like air does in a cylinder. It will lock up the engine when the pistons won't travel full length and the crankshaft won't spin.

Feb 15, 2017 | Cars & Trucks


Changing Powerstroke injectors

A key step most DIY'ers forget when changing the injectors is to remove the UVC (under valve cover) oil drain plugs. These plugs drain the excess oil from the oil passage so it doesn't leak into the cylinder and cause hydro lock (clyinders full of fluid) and damage pistons/rods. To do this you remove the valve covers and then the gasket as well as the injector harnesses. The 2 drain plugs are located directly underneath the 2 wiring harnesses (front and rear). This requires an allen wrench (4.5mm I believe) and do not torq when tightning). You must remove both to allow maximum oil drainage.

on Dec 02, 2009 | Ford F-350 Cars & Trucks

2 Answers

Hi !! I have a problem with my 2004 Ford Mustang. I was changing the spark plugs and acidentally oil whent down in the cylinder. What can I do to fix that problem ?

Leave plug out and spin the engine over it may start but just turn off. All oil will shoot out put a rag over plug hole. You will be in great shape oil won't hurt the cylinder. dONT put plug in or you could hydro lock the cylinder and break the connecting rod

Feb 04, 2015 | Ford Cars & Trucks

1 Answer

Code U3FFF

U codes are communication faults between the different modules present on your vehicle. The PCM has to maintain control via separate modules that monitor and control every aspect of it, from engine and emission control,transmission control, anti-lock, traction control, lighting, hvac, suspension control, etc...To diagnose these codes requires a quality scan tool and a technician who is experienced with these systems.

Apr 21, 2013 | 2000 Lincoln Navigator

1 Answer

Busted radiator hose, engine knock

Its possible you hydro-locked a cylinder with coolant which would have bent a connecting rod. When a cylinder gets liquid in it, the liquid will not compress so something has to give.
The head gasket could be leaking to cause the leak into the cylinder.
Hydro lock could also bend a valve.

Dec 17, 2012 | 2001 Pontiac Grand Am SE

1 Answer

2001 grand am was driving in water. now overheates and wont start

If ur car is a v6 pull the dip stick for the oil if it looks like chocolate milk that's a lower intake gasket and when coolant gets in with the oil its no longer a lubericant if u drive to long with it that way your motor will go into hydro lock were the motor locks up but does not mean that u also do not have a head gasket problem

Sep 13, 2012 | 2001 Pontiac Grand Am SE

2 Answers

Went through flood water now engine want start


Dec 22, 2009 | 1994 Oldsmobile 88

1 Answer

Car just check engine light, no oil light, no warning at all it just stopped. i heard a squealing noise, but i didnt hear any lifter tapping or piston slap or any type of knocking, its buggin...

If the motor is hydro locked then it has a coolant leak in the cylinder head or intake. The gm 3.1 and 3.4 are very well known for issue. If the batt is fully charged and the engine will not turn over that probably what it is. It can be a very costly repair so first check the oil if it looks like a milk shake or has white streaks in the oil then sorry but motor done and not worth fixing it.

Oct 04, 2009 | 1994 Pontiac Grand Am

1 Answer

I was changing my pressure line on my power steering pump. the line wouldnt break loose but the nut behind it did. i removed it and a valve and spring popped out. i put them back in and replaced the line....

small end of valve goes in first then spring might also be hydro lock jack front wheels off ground Carefull level surface wheels blocked car supported then fill pump with fluid turn wheels left & right to full stops couple of time with eng off to purge air ck fluid again then see if pump works

Aug 30, 2009 | 1994 Chevrolet C1500

1 Answer


How does the hydro boost fell "funny" - does the brake pedal go to the floor? Do the brakes lock up? engage immediatly? Does the brake light stay on, come on while brakes are applied? Have a diagnostics test done on it at a local auto parts store (usually a free service; stores may vary) and see if any codes show up. If so, the person submitting the test can tell you what the code(s) mean, and what to do to fix the problem.

Mar 31, 2009 | 2000 Ford Excursion

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