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  #1  
Old 11-11-2006, 03:22 PM
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Default P0455?

98 S70, CEL on, this code comes up -> P0455-> Generic Evaporative Emission System Leak Detected (gross leak/no flow). I had small system leak before and that was fixed ( evap valve), where do I start with gross leak?

thanks!
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  #2  
Old 11-12-2006, 11:39 AM
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Default RE: P0455?

Oh, just to add, it is not the gas cap, I had it replaced already.
tech, any thoughts?
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  #3  
Old 11-12-2006, 12:40 PM
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Default RE: P0455?

You need to inspect the lines from the Evap valve to the tank.
They vaccum hoses are known to crack over time when old.
There is one that usually cracks near the fuel filter.
If all is good then it might be the evap valve.
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  #4  
Old 11-16-2006, 06:56 PM
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Default RE: P0455?

this thing is driving me crazy. I replaced cap, evap valve, most of the vacuum lines (even though they were fine) and po455 still comes up. If car is cold it will take about 15 minutes for it to be picked up, once car warms up it becomes pending code. Since I did everything I knew and it didnt help I decided to bring it to Volvo dealer (128 Saab/Volvo in Wakefield, Ma). These guys looked at it, charged me $95 for diagnostics and didnt find nothing wrong. Told me to drive it little more and come back. CEL on again and same code again. They probably think I am printing money somewhere so I can come back and give them some every day[:@]. Anyway, I am going to deal with them tomorrow but it really drives me crazy that I cant find this vacuum leak.
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  #5  
Old 11-16-2006, 09:12 PM
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Default RE: P0455?

You might have a bad hose at the fuel tank.

Do you have access to an air compressor?
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1996 850 turbo
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  #6  
Old 11-17-2006, 09:04 PM
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Default RE: P0455?

yep, what do you have in mind?
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  #7  
Old 11-19-2006, 12:00 PM
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Default RE: P0455?

Here is what you need to do. Find a small Air pressure regulator that you can crank down pretty low.

Unplug the hose at the Evap Valve and connect to the regulator with maybe even a Vaccum/pressure guage.

Find the Charcoal canister and crimp and hold the Big hose shut.

Then carefully pressurize system to about 3.5 PSI let it pressurize for about 5-10 minutes.

Then listen for leaks.

I have a pressure guage setup with the regulator and a T Then after the 10 minutes I pinch off the line feeding pressure and watch for the guage to drop.
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1995 Yellow T5-RM running
1996 850 turbo
1994 N/A 5-speed wagon Purple (daughters)
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  #8  
Old 11-20-2006, 08:17 PM
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Default RE: P0455?

thanks for the advice. I found where the leak was. Big hose going to the canister was cracked. I inspected it before and coudnt find nothing wrong because it was cracked on the upper side and I coudnt see it from underneath the car. When I took the canister down I saw where the problem is. It's fixed now but I lost $95 to a dealership that didnt even diagnose my car. Stay away from 128 saab/volvo in wakefield, thiefs!

thanks tech!
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  #9  
Old 09-15-2009, 03:45 PM
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Default

I have the same exact problem-code p0455-gross vacuum leak. I followed this topic and found that hose at the canister was cracked too. I was pretty convinced that would take care of the problem after i replace it but cel came back yesterday with the same code..today i brought it to someone whos got volvo scanner and he read code 611-tank system. What about tank system tech, what do you think?
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  #10  
Old 11-16-2009, 03:12 AM
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Default

I got 2001 Volvo C70, and got vacum leak code, so I decided to connect a pump to the valve hose, and heard some air coming out right away, without even making any pressure. when I climbed to the back of my car, the air was blowing right at me from some quarter inch pipe, which was by filler neck, or attached to it... is it supposed to be like that? because when I close that hole, the tank becomes bigger, and holds air when I pump.. so what supposed to go into that hole?
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Old 11-16-2009, 03:12 AM
 
 
 
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Tags
128, emission, evaporative, leak, mustang, p0455, po455, s40, s60, s70, s90, sale, system, volvo, wakefield


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