Engine dies at idle after UIM removal/replacement
 

Changed my oil just now and had to remove the UIM to get to the filter, since I don't have a cap wrench. Everything went smoothly except a little coolant loss, easily fixed, so I took it out for a spin to get the new oil moving through everything. Feels much better as per usual, but my engine will now choke out - it drops revs at idle almost 95% of the time and just cuts out after trying to save itself it seems. I did notice a hose that seemed that it should be attached to something - a vacuum house perhaps? With a green and white little plastic ball type thing on it, and a smaller black hose coming off that. Does this need to be reattached somewhere? I left it unplugged as I didn't remember taking it off in the first place.

I have an 04 with no work done and 97k miles. Also please note, I have NOT searched so I apologize in advance if this has become a common question, but I looked through most of those threads already and find no such answer, and also figure the specificity of the question renders a search rather useless...and I work in five hours aha. Any help is appreciated!

So instead of buying a $5 cap wrench you pulled the UIM to do an oil change? That makes absolutely no sense!:rofl:

Yes that line needs to be reconnected to the UIM underneath in the middle up against the firewall, you should be able to reach it without pulling the UIM.

That green and white thing is a one way check valve.

Leaving a line like that disconnected causes a vacuum leak which makes the car run lean and idle like shit.

You already answered your own question... you have a vacuum leak...

connect that hose back to the under the UIM. always make sure that you reconnect anything you disconnect.

also you don't have to remove the UIM for an oil change unless you have hulk hands?

My guess is you forgot to connect a bunch of other shit, and you damaged your fuel line connections causing vacuum and fuel leaks.

That's just my guess though, who knows what you did.

What was running through your head when you removed the UIM?

I plugged in one over on the driver side, running near the coolant line. I'm still dying out when in neutral or clutched in - it sounds like I might be missing one towards the middle? I'm at work so I can't provide pictures yet.

Getting an overdue oil filter out with a non-cap wrench. I removed everything carefully, there were only a few connections on the manifold itself.

There are multiple vacuum lines, a breather line for the fuel tank, an air balancing line at the top of the manifold, a mount for the fuel lines. That's just out of memory, I'll look at the manual in a few to check for the rest.

Got em on. Idle works now, car's struggling into the higher rpm's but my cat's clogged and that's likely the issue. Are these correct? Attachment 231531