I have a 2005 Corolla that was idling very rough this morning. I have searched the forums and most cases seem to be a dirty MAF or a bad intake manifold gasket. Well this winter I got the P0171 code during two separate cold snaps so I cleaned the MAF and replaced the faulty intake gasket. I'm thinking that this is a different problem both because those issues were recently dealt with on my car and I'm idling at ~400 RPM which I don't recall happening while I had a bad gasket.
Anyway, just yesterday I had the intake manifold off the car again to replace a coolant hose, Water By-Pass Hose No. 1, part here:
The replacement hose turned out to be not quite as long as the original. The original was hooked under another part below it, but I couldn't run the new hose under the hook as well
First pic gives some context:
A closer look. I replaced the hose on the right and it used to run under the upside down J hook right below it:
Any idea if this is related to my idle problem?
Also, the roughness goes away as soon as I step on the gas pedal. And inside the car, the blower fans pick up when I step on the gas and then drop down in idle, which I don't remember happening before either.