North American Turbocoupe Organization



hissing noise and code 41
w60 Offline
Senior Member
#1
I feel like a needy nerd asking so many questions. I have a code 41, a hissing noise and a coolant smell below the intercooler.

I can't find anything leaking... and I'm sure I left something un-hooked.

Any ideas?
http://www.mycoachonline.com
White 88 TC Auto Trans
White 04 Honda CR/V
Blue 74 Honda Trail 70
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Jeff K Offline
Administrator
#2
41 = PCM detected a lean condition when closed loop was commanded on. Most common cause is a vacuum leak, as indicated by the hissing noise. Take the IC off and have a look.

Coolant smell is unrelated to the code 41. Check the water lines to the turbo and heater lines that run along the valve cover while you have the IC off. May need to pressurize the cooling system to find the leak.
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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w60 Offline
Senior Member
#3
Vacuum leak Smile

On the vacuum T, there is a line that branches off and it has a "T" on it, but it's not connected to anything and it isn't plugged. The transmission shifts very hard...so the "T" must be for "Transmission"!
http://www.mycoachonline.com
White 88 TC Auto Trans
White 04 Honda CR/V
Blue 74 Honda Trail 70
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w60 Offline
Senior Member
#4
Another question, is it possible for engine oil to mix with transmission fluid? I'm sure I'm being paranoid, but I added engine oil and I think the transmission oil level went up.

PS I'm not sure because it was months ago that I last checked the transmission oil.
http://www.mycoachonline.com
White 88 TC Auto Trans
White 04 Honda CR/V
Blue 74 Honda Trail 70
Reply

Pete D Offline
Administrator
#5
Never the two shall meet. Separated systems. Any chance the first check was with a cold trans and the second check was with the trans warm? Temperature can make some degree of difference in the dipstick reading.
Pete Dunham


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