Question about 2007 Pontiac Grand Prix GXP Sedan

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I drove through some deep water and now my car won't start. Ideas?

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Deep water presents two problems. Though the connectors in your wiring harnesses are fairly good at keeping water out, they are not completely waterproof.(why washing an engine is a very bad idea) Water in a connector permits the low voltage signals to and from the computer to change in value making the information useless. normally if you remove each one and spray the inside of each sensor plug cavity with silicone and also the plug connectors, then drying them off with a hair dryer or just leave it sitting in the sun, most times it will re-start when dry.
Second problem is a whole lot more serious. If water gets into the air intake, it can cause hydro-lock in one or more cylinders. Since the crankshaft and pistons have rotating mass that cannot stop instantaneously, the engine attempts to compress the water. The weak link is the connecting rods and piston tops....When water is in a cylinder, since water nor any fluid can be compressed, it will either bend a connecting rod or cave in a piston top. To determine if that's happened, you need to remove the plugs and disable the ignition system. Then, spin the engine over as if you are starting it. If water shoots from any of the plug holes, you know why. Next, you'd need to do a compression test. Very low or no compression tells you there's a big problem. That case, you need a total rebuild or engine replacement.
Hope your problem is ignition related!!!

Posted on May 20, 2011


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o no! how deep?
my have sucked in water!
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change engine oil also,maybe should do this before trying to start it any more. take off cap and rotor and dry off. try watching plug wires . if they spark in the dark when trying to start they are worn out and soaked with water and shorting out to the engine. check fuses also

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