2014 Z51 Engine knocking
Thread Starter
Heel & Toe
Joined: Sep 2021
Posts: 18
Likes: 1
2014 Z51 Engine knocking
Hi, we need help determining the engine knock on this 2014 Corvette Z51(Dry sump) Automatic
Other symptoms are engine oil pressure dropping when engine oil gets hot. Dropping as low as 10psi at idle(we shut it off after that)
https://imgur.com/a/6KfM10t
P0324-00 Knock Sensor Module Performance
P0326-00 Knock Sensor Performance
Backstory:
Corvette bought at salvage auction a long time ago but the owner let it sit for at least 3-4 years. We started working on it this year to get it running. Changed the oil, spark plugs, wires etc. We used the correct amount of oil 9 quarts and Mobil-1 5w-30.
About a mile in the drive not going past 3-4k RPM it shut off. Next time we got it running we heard this loud squeeling noise and then this ticking sound ever since. Sound mostly comes from the bottom but it's so loud that you can hear it anywhere in the engine.
Also 1 smoking gun is that we see orange sealant on the front and back of the engine meaning the person that had the car before salvage had the engine open at some point. We know there is something wrong but want to pinpoint if it's AFM related or rod knock.
Other symptoms are engine oil pressure dropping when engine oil gets hot. Dropping as low as 10psi at idle(we shut it off after that)
https://imgur.com/a/6KfM10t
P0324-00 Knock Sensor Module Performance
P0326-00 Knock Sensor Performance
Backstory:
Corvette bought at salvage auction a long time ago but the owner let it sit for at least 3-4 years. We started working on it this year to get it running. Changed the oil, spark plugs, wires etc. We used the correct amount of oil 9 quarts and Mobil-1 5w-30.
About a mile in the drive not going past 3-4k RPM it shut off. Next time we got it running we heard this loud squeeling noise and then this ticking sound ever since. Sound mostly comes from the bottom but it's so loud that you can hear it anywhere in the engine.
Also 1 smoking gun is that we see orange sealant on the front and back of the engine meaning the person that had the car before salvage had the engine open at some point. We know there is something wrong but want to pinpoint if it's AFM related or rod knock.
Le Mans Master
Joined: Oct 2008
Posts: 5,712
Likes: 221
From: Irving, TX
If it's AFM you should be able to pull the valve covers, pull the fuel pump fuse and turn the engine over with the starter and see if any of your valves aren't opening. The video certainly sounds like bottom end though, add in low oil pressure and yeah bottom end is likely. A quick youtube search should give you a video on how to pull the dry sump pan without pulling the whole engine.
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Rod knock.
If the prior owner was able to pull the pan....which is a total PIA with the engine in the car....they likely pulled a couple caps, saw what was going on, and put it back together, and sold it.
If the prior owner was able to pull the pan....which is a total PIA with the engine in the car....they likely pulled a couple caps, saw what was going on, and put it back together, and sold it.
