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1997 Chevrolet C K 1500 Base Reg Cab 117.5 WB (CMI)

1997 Chevrolet C K 1500
Trim Info:
Rear Wheel Drive, Reg Cab 6.5' Fleetside
17 mpg city / 22 mpg hwy
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April 30, 2013, 2:18 pm

Roy B

Question: What's causing my engine to hydrolock?

I have a '96 Chevy Silverado, 5.7L V8. I'm getting a hydrolock condition in several cylinders. A new spider assembly was installed about three weeks ago due to a misfire problem. Afterward, things were fine for a couple of weeks until it began hydrolocking.

I've been probing around and discovered that where the harness connects to the fuel meter body is full of fuel, and that one of the sets of connector pins from the injector was pushed all the way through the fuel meter body and was sitting just under it out of reach and almost out of sight (since the holes are so small). This seems problematic, but I don't know if it's causing the hydrolock.

Also, when the key is ON but not cranking, I'm getting voltage on the computer signals that ground the injectors, which seems to me to indicate that the computer is telling the injectors to stay open when the key is turned on.

I tested all the injectors (except the one that has fallen through) for resistance, and they all are at about 12.3 OHM, which is in the specification range.

I'm stumped and don't know where to go from here. I want to know for sure exactly what is causing the issue so that I don't just throw parts at it. Can you help.


May 3, 2013, 8:36 pm

Ron W
Expert Mechanic

When you say it is hydro-locking; how do you know that? And is it fuel or coolant that we are talking about?

I will say if the spider isn't installed correctly, you need to fix that first before you get much deeper as it may be the whole issue.

On a side note, you will see voltage on the ground side of the injectors when they are NOT on. Voltage drops to near zero when the injector is energized, so if you see voltage, that means the injectors are off and not spraying fuel.

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