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2016 ATS-V Coupe (Catti-V)
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Discussion Starter #1
I'll start by saying I've been plagued with this for a long time and never knew it was happening. Finally, after getting a new high octane tune from Trifecta, I started have problems with the ECU pulling power in the mid range. It would knock me down to 10psi and felt like I was dragging an anchor. I ran data logs and Steven discovered the cause. My IMAT was up over 160 just cruising. He gave me a simple way to test if there's an air pocket issue which I'll share.

(with trifecta tune)Put the car in service mode and switch to track. The tune turns on the coolant pump all the time in this mode to help cool things down between track runs.
Listen for the pump, you'll hear it, and if it cuts off after 5 seconds it's sensing cavitation (air pocket or no coolant) and turning itself off.
If you never hear it there's either a pump issue or the fuse or relay are bad in the engine compartment.

If you don't have the tune you can turn on the car, put it in track mode, and listen for the same things from pump.

Mine was cycling off every 5 seconds.

Materials you'll need:
At least 12" of clear plastic hose, with a 3/4" internal diameter.
1/4" dowel about 20" long
Funnel that fits snugly in the hose
Gallon of distilled water

Pull the cap off the fill valve and push on the hose. One the other end push on the funnel. Insert the dowl through the funnel so you can push down on the valve to open the fill port.

Now turn on service mode and switch the car to track. Go to the funnel, fill about halfway with water and push the valve open with the dowel. You may or may not see bubble come out. I did right away and then it stopped. It slowly drank what was in the tube.

When the pump cycles off pull the relay and reinsert. Keep repeating the cycle for a while and squeeze the two hoses coming off the manifold to burp off bubbles. You'll know you've got the air out when the pump stays on.

I also powered the car up every so often since the pump runs at a higher speed with car on.

I reached a point where nothing else was happening but when I watched the water in the hose it was slowly going down into the system. Thats a good thing. Eventually everything leveled off but my pump was still cycling on and off. I played the long game and kept repeating.

On my last cycle I started the car for a few seconds and then went back to pulling the fuse to reset the pump and keeping water in the tube. All of a sudden I heard the pump start gurgling and in a few seconds there was a rush of bubbles coming up out of the hose as it drank down the entire tube and then some. Now my pump stayed on...YAY!!!
I let the pump run for a bit while squeezing hoses and watching the water and eventually there was no more bubbles and no more drinking of the water.

Problem solved.

Now I need to see how my IMAT look.

From what I read on the corvette forum when the pump senses cavitation it will cycle off after 5 seconds but reset after 3 minutes, and then repeat if it still senses cavitation. This would explain why my temps were high but not through the roof. It cycled enough to keep things controlled but not low enough.

All of this is from my research but mainly from Kenneth Rabyand Steven J Weller for guiding me through it. There's a good video on youtube for a Corvette intercooler fill

https://youtu.be/QgNS9fVJbco
54728847_265573907664636_1349277268962181120_n.jpg 54730769_423409555091493_7909961060528947200_n.jpg 55468478_609387502857565_157597880691982336_n.jpg
 

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2016 ATS-V Coupe (Catti-V)
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Discussion Starter #4
Rather then resizing photos I'll just post the data.

Both of these runs were cruising at 80mph on the highway after a 7 mile city drive. The first was last week when the new tune gave me problems.
Intake = 78.8
Post turbo = 100.4
IMT = 150.8

The last is measured today, same conditions but 15 degrees warmer ambient

Intake = 84.2
Post turbo = 98.6
IMT = 114.8
 

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2017 ATS-V 6MT CWT Sedan, Tuned 2016 Explorer TT
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What is the coolant pump supposed to sound like? I put the car into service mode and in or out of track mode, there is a slight hum from around the area of the filler port. I do not hear any difference in sound between modes and not sure what to listen for. I should note that its a 45 degree evening here. Maybe the pump isn't running, because it doesn't need to.
 

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Wow. That's a huge drop in temps. What do you think could have caused low fluid in the intercooler? Someone had a thread here a few weeks ago with a 'factory dud' that had the exact same issue. I wonder how many cars could be suffering from low fluid intercoolers unbeknownst to owners.
 

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Discussion Starter #7
What is the coolant pump supposed to sound like? I put the car into service mode and in or out of track mode, there is a slight hum from around the area of the filler port. I do not hear any difference in sound between modes and not sure what to listen for. I should note that its a 45 degree evening here. Maybe the pump isn't running, because it doesn't need to.
If you have the trifecta tune the pump comes on continuous in service mode and then track.

If you don't you will have to run the car I believe. If so do this when the car is cold so the fluid never has a chance to get too hot. Maybe others can confirm.

It sounds like a humming small electric motor.
 

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Just tried it with the car cold and running. Whether in track or tour mode, there is no difference in sound. Can't tell if the pump is running or not.
 

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'16 ATS-V MT6 Sedan, Alfas: '67 Duetto, '84 GTV6 3.5L 24v/Vette C5 project
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Curious... I understand the use of distilled water (no minerals to cause oxidation problems) but isn't there some sort of water wetter or such that should be added for better cooling results?
 

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Discussion Starter #10
Curious... I understand the use of distilled water (no minerals to cause oxidation problems) but isn't there some sort of water wetter or such that should be added for better cooling results?
Thats an additive you can use but it's not required. I'm probably running a 60/40 mix now rather than a 50/50. That's fine since it might have changed my freeze point from -30 to -20. Not so worried about that in FL. All the anti corrosion properties are still there.
 

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Discussion Starter #11
Just tried it with the car cold and running. Whether in track or tour mode, there is no difference in sound. Can't tell if the pump is running or not.
If you don't have the tune you'll have to figure how to get it on. I immagined turning the car on would have it running. You would still have to pull and reinsert the relay after every 5 seconds if it's cycling off due to cavitation. I would start the car and wait 10 seconds. Then pull the relay and reinsert while touching/squuezing one of the hoses coming of the IM. You should feel the coolant flowing if it comes on.

Maybe others can chime in with suggestions.
 

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In a (somewhat) related Corvette intercooler video, the poster had a trick switch tool which he plugged in to the engine bay fuse box (no doubt in the relay spot) and he could toggle the pump on/off by command. That's pretty cool! (and handy to say the least!)
 

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Discussion Starter #13
In a (somewhat) related Corvette intercooler video, the poster had a trick switch tool which he plugged in to the engine bay fuse box (no doubt in the relay spot) and he could toggle the pump on/off by command. That's pretty cool! (and handy to say the least!)
Same as pulling switch but yes nice.
 

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just FYI for anyone with a HPtuners tune via whoever, theres settings for the pump I have my pump on 100% of the time now so it will turn on with the key "on" position and engine off, before it would only run when temps reached a certain level, I think it was like 90 degrees or something.
 

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Discussion Starter #15
just FYI for anyone with a HPtuners tune via whoever, theres settings for the pump I have my pump on 100% of the time now so it will turn on with the key "on" position and engine off, before it would only run when temps reached a certain level, I think it was like 90 degrees or something.
The pump doesn't flow fluid all the time when the car is on? That's odd because the only thing that makes the fluid work is the fact that it circulates
 

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Discussion Starter #17
In a (somewhat) related Corvette intercooler video, the poster had a trick switch tool which he plugged in to the engine bay fuse box (no doubt in the relay spot) and he could toggle the pump on/off by command. That's pretty cool! (and handy to say the least!)
He is using this switch:
https://gspeed.com/product/z06-intercooler-pump-override-tool/
Nice find. The intercooler fuse is right next to the relay so they're most likely tapping that to a constant 12 source.
 

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Discussion Starter #19
Did [email protected] give a reason why the fluid for the intercooler system would be low?

Thanks
Almtyscuzzy
It could be anything from it not being properly filled from the factory, service not not checking it or properly filling it, who knows. I know about a year ago they had to replace one of my intercoolers because it got damaged by a possum I hit. They are prone to that due to their position. If you feel your intercooler system continues To lose fluid I would have it inspected for a leak.
 

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I've been having issues with my car not making consistent boost ever since purchasing it a year ago. I have the Trifecta tune. I put the car in service and Track mode and hear nothing. I pulled and replaced the relay. I then swapped the relay with another one. Nothing. Where do I go from here?
 
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