North American Turbocoupe Organization



Smokeshow!
Rob H Offline
Member
#1
I went across town to get something and came back.
I don't know exactly when this started but I suspect I got lucky and it was pretty much within a minute of getting back home, or even right when I got back home. Definitely would have seen the smoke anywhere else that I was at a stop and I didn't see anything until I pulled up at my place.
I'll have to get out there and see if I can find what's leaking coolant. I suspect it's a very small leak, hopefully just a hose.
There was a noise of a motor, maybe a pump? It was running the whole time after the engine was turned off. I'm not sure if that's normal, maybe something to do with the fact that I'm losing coolant?
I'll put two links to videos if you want to see the smoke show, the first one runs a couple minutes long there's not a whole lot to see really. More or less just had the camera going while I was looking around. Second one is a much shorter video after it stopped smoking. That motor noise was still happening though. I disconnected the battery for now so it doesn't drain it.
I guess my question for now mainly is about the motor or pump. What is running and why? Not sure if anyone can tell just from the video or not.
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Rob H Offline
Member
#2
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andrewjs18 Offline
Administrator
#3
I swear I see some coolant on your downpipe in your 2nd video at about the 11 second mark...
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anasazi4st Offline
Senior Member
#4
Based on my observation from where the sound seems to be coming from—yes, I know that sound—I would say it’s the pump on the ABS unit that recharges the accumulator.

Quick lesson on the ABS unit: essentially it’s a braking system that stores up to as much as 300 lbs of pressure. When you slam on the brake in a panic stop that pressure is applied and used by “pumping” the brakes in a proportional way to help bring you to a safe stop.

It should not run all the time. And, there is no coolant leak associated with these parts.
Another proud dues-paying member.

1987 Turbo Coupe w/T5OD, 8.8 axle, grey smoke; most options. Got it in 1991 with 41K miles: 3 turbos, 2 heater cores, 1 T5OD full rebuild, 5 clutches, 1 head gasket, 2 Teves II ABS units, etc. later....
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Rob H Offline
Member
#5
(06-21-2019, 11:08 AM)anasazi4st Wrote: Based on my observation from where the sound seems to be coming from—yes, I know that sound—I would say it’s the pump on the ABS unit that recharges the accumulator.

Quick lesson on the ABS unit: essentially it’s a braking system that stores up to as much as 300 lbs of pressure. When you slam on the brake in a panic stop that pressure is applied and used by “pumping” the brakes in a proportional way to help bring you to a safe stop.

It should not run all the time. And, there is no coolant leak associated with these parts.

It was pretty late when this all happened last night. There was no sudden braking and I had no problem braking.
 Did some searching around the internet, and something that kept on popping up in search results for various vehicles was an axillary coolant pump or water pump whatever. It was usually talking about sending coolant to the turbo to keep the bearing from overheating.
I thought that was interesting as a lot of the smoke seemed to be coming from under the intercooler in the general area of the Turbo as well as the various things I was reading just so happened to always be in relation to vehicles with turbochargers
. Hopefully I didn't cook anything disconnecting the battery. I did let it run for a good 5 to 10 minutes.
Any thoughts on the possibility of it being an axillary pump?
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Rob H Offline
Member
#6
(06-21-2019, 07:47 AM)andrewjs18 Wrote: I swear I see some coolant on your downpipe in your 2nd video at about the 11 second mark...

Yes you are right it definitely is coolant, as you said you can see it on the down pipe. Also the smoke was really white with a sweet smell to it.
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Jeff K Offline
Administrator
#7
Coolant hose to heater core? Or one of the metal lines that run around the back of the engine to the oil cooler sprung a pinhole leak (not uncommon). Dont forget to check the hose from the bung on the lower intake to the 3 way junction hiding kind of under the back part of the intake. Shouldn't be too hard to find the leak.

Also ABS pump pressure is WAY over 300 psi. Brake pressure switch on the MC (PWS = Pressure Warning switch in Fordspeak) triggers ABS pump motor to pump fluid to the accumulator when accumulator pressure drops below around 1950 psi, and shuts off the pump motor when pressure hits around 2250 psi. In most automotive braking systems brake line pressure can go as high as 800+ psi when "standing on the brake pedal" in a panic stop.

99.999% chance ABS pump running after key is off is stuck pump relay (one of the 2 relays under the vac tree). Sometimes swatting the relay with a wrench will unstick it and shut the pump off. Motor has an internal thermal switch to shut the motor off if it runs so long that it overheats.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Rob H Offline
Member
#8
(06-21-2019, 06:48 PM)Jeff K Wrote: Coolant hose to heater core? Or one of the metal lines that run around the back of the engine to the oil cooler sprung a pinhole leak (not uncommon). Dont forget to check the hose from the bung on the lower intake to the 3 way junction hiding kind of under the back part of the intake. Shouldn't be too hard to find the leak.

Also ABS pump pressure is WAY over 300 psi. Brake pressure switch on the MC (PWS = Pressure Warning switch in Fordspeak) triggers ABS pump motor to pump fluid to the accumulator when accumulator pressure drops below around 1950 psi, and shuts off the pump motor when pressure hits around 2250 psi.  In most automotive braking systems brake line pressure can go as high as 800+ psi when "standing on the brake pedal" in a panic stop.

99.999% chance ABS pump running after key is off is stuck pump relay (one of the 2 relays under the vac tree). Sometimes swatting the relay with a wrench will unstick it and shut the pump off. Motor has an internal thermal switch to shut the motor off if it runs so long that it overheats.

Unfortunately with work I won't be able to investigate for several days Sad
In regards to this pump...
I've never had anything running after I shut the car off until exactly now when this happened.
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anasazi4st Offline
Senior Member
#9
I’ve never heard of an “auxiliary pump” for the turbo coolant on our cars. I’ve installed a few turbochargers and am unaware of any such device, although it might be a good idea.
Another proud dues-paying member.

1987 Turbo Coupe w/T5OD, 8.8 axle, grey smoke; most options. Got it in 1991 with 41K miles: 3 turbos, 2 heater cores, 1 T5OD full rebuild, 5 clutches, 1 head gasket, 2 Teves II ABS units, etc. later....
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Rob H Offline
Member
#10
Yes I haven't heard either, just heard reference to them when searching around, made sense at he time given that I had a coolant leak near the turbo, and whatever it is only started exactly when the leak started.
Been working 13 hours a day the last several days, no time to look at it yet. Hoping maybe Thursday I'll get a chance to locate the leak if I'm home before the sun goes down
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