fumes
01-08-2017, 10:24 AM
#32
Rennlist Member
Check all of the lines that carry fuel or vapor.
By now the original rubber lines are getting spongy. The small amount of methanol that modern gas blends aren't helping the situation.
Areas to check:
* Fuel tank and expansion tank (there are a lot of lines associated with the fuel tank; I've had to replace all the lines on the fuel tank and expansion tank on my car)
* Vent line back to engine compartment and lines to the carbon canister
* All fuel lines
I don't think I would replace the filler pipe or carbon canister. Reasons being:
* Many have gone to the expense of replacing the filler pipe (including myself) with <0> results
* The activated charcoal in the canister can absorb hydrocarbons forever. If fuel should enter the canister for any reason, then it must be replaced.
Many 964 series cars have this issue.
I personally believe that the problem resides either with the control valve (which manages the flow of vapors between the fuel tank and engine) or the placement of the canister fresh air line (right behind the driver's door).
I plan on doing a little experimental work on this in the early spring.
By now the original rubber lines are getting spongy. The small amount of methanol that modern gas blends aren't helping the situation.
Areas to check:
* Fuel tank and expansion tank (there are a lot of lines associated with the fuel tank; I've had to replace all the lines on the fuel tank and expansion tank on my car)
* Vent line back to engine compartment and lines to the carbon canister
* All fuel lines
I don't think I would replace the filler pipe or carbon canister. Reasons being:
* Many have gone to the expense of replacing the filler pipe (including myself) with <0> results
* The activated charcoal in the canister can absorb hydrocarbons forever. If fuel should enter the canister for any reason, then it must be replaced.
Many 964 series cars have this issue.
I personally believe that the problem resides either with the control valve (which manages the flow of vapors between the fuel tank and engine) or the placement of the canister fresh air line (right behind the driver's door).
I plan on doing a little experimental work on this in the early spring.
01-09-2017, 08:53 AM
#33
Rennlist Member
Sorry to revive an old thread, esp since I don't think it's the same problem as others here have had.
Car gives off a fairly strong 'chemical' odor. I say chemical because it doesn't smell like fuel. Almost more like paint?? It permeates the garage and is particularly strong inside the cabin after it's been sitting for more than a few hours. It quickly goes away after driving and operating the HVAC system. No egregious fluid leaks other than the typical oil weep under the car. Car has not been repainted (at least not that I know of and definitely not recently even if so). I chalked it up to 'old car fumes', but I doubt this is normal.
Car gives off a fairly strong 'chemical' odor. I say chemical because it doesn't smell like fuel. Almost more like paint?? It permeates the garage and is particularly strong inside the cabin after it's been sitting for more than a few hours. It quickly goes away after driving and operating the HVAC system. No egregious fluid leaks other than the typical oil weep under the car. Car has not been repainted (at least not that I know of and definitely not recently even if so). I chalked it up to 'old car fumes', but I doubt this is normal.
If you recall I had noticed some minor oil leaks. Do you think they used some kind of solvent to clean the heater boxes and is slowly burning off? I just cleaned a friends C2 and his boxes had 1/4" of oil in them. No matter how hard we tried we could only get the obvious oil and the seams around the boxes held some oil and residue of the cleaning solution. It took a number of heat cycles and blowing out the ventilation system for it to go away. Initially the vents were blowing thick smoke, now there is no smoke but it will be a while before the smell is all gone.
01-09-2017, 09:47 AM
#34
Rennlist Member
I just cleaned a friends C2 and his boxes had 1/4" of oil in them. No matter how hard we tried we could only get the obvious oil and the seams around the boxes held some oil and residue of the cleaning solution. It took a number of heat cycles and blowing out the ventilation system for it to go away. Initially the vents were blowing thick smoke, now there is no smoke but it will be a while before the smell is all gone.
I thought oil smell when the heat was on was a core characteristic of 911 ownership; kind of like an aphrodisiac
01-09-2017, 09:57 AM
#35
Rennlist Member
01-09-2017, 07:40 PM
#36
Rennlist Member
Check all of the lines that carry fuel or vapor.
By now the original rubber lines are getting spongy. The small amount of methanol that modern gas blends aren't helping the situation.
Areas to check:
* Fuel tank and expansion tank (there are a lot of lines associated with the fuel tank; I've had to replace all the lines on the fuel tank and expansion tank on my car)
* Vent line back to engine compartment and lines to the carbon canister
* All fuel lines
I don't think I would replace the filler pipe or carbon canister. Reasons being:
* Many have gone to the expense of replacing the filler pipe (including myself) with <0> results
* The activated charcoal in the canister can absorb hydrocarbons forever. If fuel should enter the canister for any reason, then it must be replaced.
Many 964 series cars have this issue.
I personally believe that the problem resides either with the control valve (which manages the flow of vapors between the fuel tank and engine) or the placement of the canister fresh air line (right behind the driver's door).
I plan on doing a little experimental work on this in the early spring.
By now the original rubber lines are getting spongy. The small amount of methanol that modern gas blends aren't helping the situation.
Areas to check:
* Fuel tank and expansion tank (there are a lot of lines associated with the fuel tank; I've had to replace all the lines on the fuel tank and expansion tank on my car)
* Vent line back to engine compartment and lines to the carbon canister
* All fuel lines
I don't think I would replace the filler pipe or carbon canister. Reasons being:
* Many have gone to the expense of replacing the filler pipe (including myself) with <0> results
* The activated charcoal in the canister can absorb hydrocarbons forever. If fuel should enter the canister for any reason, then it must be replaced.
Many 964 series cars have this issue.
I personally believe that the problem resides either with the control valve (which manages the flow of vapors between the fuel tank and engine) or the placement of the canister fresh air line (right behind the driver's door).
I plan on doing a little experimental work on this in the early spring.
Hope you're enjoying the toy. It didn't appear to have any paint work when I saw it but I did not meter the car.
If you recall I had noticed some minor oil leaks. Do you think they used some kind of solvent to clean the heater boxes and is slowly burning off? I just cleaned a friends C2 and his boxes had 1/4" of oil in them. No matter how hard we tried we could only get the obvious oil and the seams around the boxes held some oil and residue of the cleaning solution. It took a number of heat cycles and blowing out the ventilation system for it to go away. Initially the vents were blowing thick smoke, now there is no smoke but it will be a while before the smell is all gone.
If you recall I had noticed some minor oil leaks. Do you think they used some kind of solvent to clean the heater boxes and is slowly burning off? I just cleaned a friends C2 and his boxes had 1/4" of oil in them. No matter how hard we tried we could only get the obvious oil and the seams around the boxes held some oil and residue of the cleaning solution. It took a number of heat cycles and blowing out the ventilation system for it to go away. Initially the vents were blowing thick smoke, now there is no smoke but it will be a while before the smell is all gone.
Car was paint metered before I bought it. So, no repaint. It just smells like paint. Or maybe it is fuel??? Doesn't smell like gas out of the pump though. Whatever it is, it's not burning off or diminishing in intensity. I went for quick drive with my son this past weekend and the smell seemed even more intense. Heater was on and the smell was pretty concentrated on initial startup but, again, dissipated after driving for a while.
01-10-2017, 12:16 AM
#37
Rennlist Member
Possibly a freon leak at the expansion valve just on top of the evaporator coils , sits
Directly under the cowl center of the dash vents..
Good number of O rings in this area if A/C were run or even just tested bringing to pressure could create a chemical fume in interior ,, ask me how I know ...
Just a thought , thanks Bert
Directly under the cowl center of the dash vents..
Good number of O rings in this area if A/C were run or even just tested bringing to pressure could create a chemical fume in interior ,, ask me how I know ...
Just a thought , thanks Bert
01-10-2017, 12:20 AM
#38
Rennlist Member
Possibly a freon leak at the expansion valve just on top of the evaporator coils , sits
Directly under the cowl center of the dash vents..
Good number of O rings in this area if A/C were run or even just tested bringing to pressure could create a chemical fume in interior ,, ask me how I know ...
Just a thought , thanks Bert
Directly under the cowl center of the dash vents..
Good number of O rings in this area if A/C were run or even just tested bringing to pressure could create a chemical fume in interior ,, ask me how I know ...
Just a thought , thanks Bert
01-11-2017, 10:56 AM
#39
Rennlist Member
If it is a fuel odor (and sounds like it to me, except for the smell part), I may have a solution in the spring.
01-12-2017, 12:23 AM
#40
Rennlist Member
Like most problems with cars, the causes can vary greatly. What's making your issue difficult to diagnose over the internet is your description of the odor. Based on that, you have no other choice then to check every possible cause.
If it is a fuel odor (and sounds like it to me, except for the smell part), I may have a solution in the spring.
If it is a fuel odor (and sounds like it to me, except for the smell part), I may have a solution in the spring.
It's more of an annoyance at this point. No codes, no puddles on the garage floor, and most importantly, I haven't passed out from the fumes
Looking forward to what you find.
