97 Cad ETC EVAP hoses - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-18-2013, 04:40 PM   #1
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Default 97 Cad ETC EVAP hoses

I can't find any pictures that show how the vacuum lines in and around the EVAP are hooked up. Does anyone have either clear cut pictures or an schmatic that shows what lines go where?

Thanks for your help,

Brad
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Old 04-18-2013, 10:43 PM   #2
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Does it have the 3.8 or the 4.0 engine.
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Old 04-18-2013, 10:48 PM   #3
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Old 04-18-2013, 11:20 PM   #4
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rjblazer,

It has the northstar 4.6L motor. The first picture is close. I don't know if it makes any difference, the car was purchased in CA. Anyway, I'll give it a shot and see what happens. Then I can get after my original problem. It flashes a #2 bank lean condition. #1 bank sometimes a well. This indicates an air leak somewhere that I've so far been unable to locate. I even replaced the intake manifols to no avail.
Thanks for the info,
Brad
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Old 04-19-2013, 07:36 AM   #5
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once you make sure all the vacuum lines are good, try running the engine and spraying carb cleaner around different areas. if the motor changes pitch thats your leak
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Old 04-27-2013, 03:44 PM   #6
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Default vacuum leaks Northstar

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Originally Posted by jwfirebird View Post
once you make sure all the vacuum lines are good, try running the engine and spraying carb cleaner around different areas. if the motor changes pitch thats your leak
For starters, I found that the vacuum lines were not correct. I fixed that, but I had used carb cleaner in the past, but it didn't change the pitch of the motor. With an application running on my laptop I could read the fuel trim produced by the O2 sensors. With the engine fully warmed up it would occasionly spit out P174 & P171 banks 1 & 2 running to lean. conclusion is that there is an air leak somewhere. When I spraided the carb cleaner under the intake manifold I couldn't hear any change in the motor, but the fuel trim was changing. Right now I have the intake manifold off and will do a clay check to see where it is leaking. I'll keep you advised what I find.

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Old 04-27-2013, 08:06 PM   #7
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whats a clay check?
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Old 04-27-2013, 08:59 PM   #8
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Clay check is a method we use to use back in my old hot rod days to check piston/valve clearence. It use to get rather messy when a valve would kiss a piston at high RPM. Where the intake ports on my cyclender heads are located may not exactly match up to the intake manifold, thus an air leak. This way I can check how the two mate together. Where ever there'* a problem I can then address it and stop the leakage.

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Old 04-28-2013, 09:40 AM   #9
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ok. if you replaced the intake and gaskets, there could could be a component causing the air leak. like the heat controls or egr. basically anything after the maf can cause the lean codes.
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Old 04-28-2013, 05:30 PM   #10
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"ok. if you replaced the intake and gaskets, there could could be a component causing the air leak. like the heat controls or egr. basically anything after the maf can cause the lean codes."
True, but I independly unhooked each hose and disconnected the connector on each device hooked to the intake manifold and nothing changed. Only when I sprayed carb cleaner inderneath the intake manifold did the fuel trim change. That leeds me to believe that the gaskets are not compleeting sealing on the inside of the manifold. Once I take the throtle body off the intake manifold I will be able to place the manifold in the right place and the clay will show me the wide spots. After that I can either shave down the intake manifold or use somthing like permatex to seal the intake ports.

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