Hello, all!
I found several FTE sites on the Interweb, and apparently I am already a member of at least one of them, even though they can't confirm my email. Oh, well...
So, now i"ll jump right into the problem...
About 2 years ago, right after I had my spark plugs changed at 100K miles (and intake taken off), I noticed that, in cold weather, when I came up to the stop sign at the end of my street, the engine idles down to about 400rpm and feels rough. By rough, I don't mean uneven, as I can't hear or feel a miss. After the car warms up, it gradually does better.
I have had the IAC valve, EGR valve, DPFE sensor and intake gaskets replaced, had a fuel system cleaning, and the dealership performed a computer upgrade, fuel trim adjustment and vacuum test. The problem is that by the time the mechanic gets the car, the engine and engine compartment has warmed up and the symptoms disappear.
I suspected the intake gaskets, that there was a 'cold leak', and as the engine warms up, the gasket material gradually expanded and sealed the leak.
It does seem to run better since the gaskets were replaced, but I don't think it's completely fixed. I will know when colder weather rolls back around.
The only thing left to look at, as far as my limited knowledge is concerned, is to more closely investigate the vacuum lines (since they are now 9 years old), and maybe have the dealership go into the computer and raise the curb idle. I may also look into changing out the PCV valve, as that essentially has to be removed just to change the air filter.
Has anyone else experienced this? Any advice?
Thanks!
I found several FTE sites on the Interweb, and apparently I am already a member of at least one of them, even though they can't confirm my email. Oh, well...
So, now i"ll jump right into the problem...
About 2 years ago, right after I had my spark plugs changed at 100K miles (and intake taken off), I noticed that, in cold weather, when I came up to the stop sign at the end of my street, the engine idles down to about 400rpm and feels rough. By rough, I don't mean uneven, as I can't hear or feel a miss. After the car warms up, it gradually does better.
I have had the IAC valve, EGR valve, DPFE sensor and intake gaskets replaced, had a fuel system cleaning, and the dealership performed a computer upgrade, fuel trim adjustment and vacuum test. The problem is that by the time the mechanic gets the car, the engine and engine compartment has warmed up and the symptoms disappear.
I suspected the intake gaskets, that there was a 'cold leak', and as the engine warms up, the gasket material gradually expanded and sealed the leak.
It does seem to run better since the gaskets were replaced, but I don't think it's completely fixed. I will know when colder weather rolls back around.
The only thing left to look at, as far as my limited knowledge is concerned, is to more closely investigate the vacuum lines (since they are now 9 years old), and maybe have the dealership go into the computer and raise the curb idle. I may also look into changing out the PCV valve, as that essentially has to be removed just to change the air filter.
Has anyone else experienced this? Any advice?
Thanks!