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I replaced the thermo in the "Jonneville" yesterday. Afterwards the heat seemed fine (TYVM) but the car was idling very rough and the check engine illuminated. An OBD scan revealed that the throttle position sensor was the source but since that could mean a connection had been knocked loose or wet I was head under hood. When in Sleuth mode I noticed a hiss that wasn't didn't seem normal and discovered when I covered a hole in the (?) that the engine smoothed out. Overall the connector which had been securing a vacuum line to the (?) (throttle? Fuel injectors?) had rotted and fallen off, probably held on by vacuum while driving and I must have touched it while working on the thermo housing. The autozone didn't have a real replacement part and we substituted a small hose section and some connectors but I think the real part would be better at avoiding collapse under vacuum and want to know if if this is a standard part I can order elsewhere or only through GM. Is it even worth replacing with an OEM part quickly or should I wait until it's convenient?

Image linked shows the part that rotted, I'd call this a vacuum line "J" connector but if anyone knows the real name of it or where to get it or if I should even be concerned that would be great.



Also any information on what part of the engine I'm working on would be informative and appreciated. Thank you.

That is the TB and looks like a short piece of vacuum hose would work fine there.

The problem with this is that it has a flaired end to the throttle body and "no" retail parts store, that I have found, carries them. I prefabbed one up with two different sized tubes until I can get to the dealer and see what they are gonna "hose" me for it!!

Mine broke while doing my LIM gaskets and haro and I repaired it with some vac hose and a heat gun. Been fine for 2+ years now. The real line is 1 of 2 "Vacuum Harness" pieces from the dealer, and that one is around $17, IIRC.

ouuuuuccccchhhhhh!!

Mac077 wrote:... until I can get to the dealer and see what they are gonna "hose" me for it!!

So that's the throttle body, got it and yes, They will hose me for it but I'll still probably get it just to make sure it doesn't collapse on me. Car seems to be running fine but I'm actually thinking now that the problem with the heat was more likely the HVAC thermostat since it blows hot air but not when set to a temp around 75, needs to be up around 85° but that's for another post.

The hose which the fine gentleman from l'Autozone placed there seems to be pinching itself through the bend. I'll need something stiffer. My guess is that a real vacuum line has enough structure to prevent collapse suggestions are welcome on what type of hose or what size works best.

I replaced the thermo in the "Jonneville" yesterday. Afterwards the heat seemed fine (TYVM) but the car was idling very rough and the check engine illuminated. An OBD scan revealed that the throttle position sensor was the source but since that could mean a connection had been knocked loose or wet I was head under hood. When in Sleuth mode I noticed a hiss that wasn't didn't seem normal and discovered when I covered a hole in the (?) that the engine smoothed out. Overall the connector which had been securing a vacuum line to the (?) (throttle? Fuel injectors?) had rotted and fallen off, probably held on by vacuum while driving and I must have touched it while working on the thermo housing. The autozone didn't have a real replacement part and we substituted a small hose section and some connectors but I think the real part would be better at avoiding collapse under vacuum and want to know if if this is a standard part I can order elsewhere or only through GM. Is it even worth replacing with an OEM part quickly or should I wait until it's convenient?

Image linked shows the part that rotted, I'd call this a vacuum line "J" connector but if anyone knows the real name of it or where to get it or if I should even be concerned that would be great.

I just registered to update this post because I spent all day looking for the exact same thing. My 2001 bonneville ssei through code P0171. I found the same exact part broken leading to a vacuum leak which caused the code. Turns out that you can't just by that rubber piece you must but the 12" or so hard vacuum line and the other rubber connector with it. GM Part Number is: 24506665 ("TUBE. Early Fuel Evaporation"). Cost me $18 for the whole thing locally, which was less than what it would have been if shipped online. Hope this helps anyone else who has the same problem.

You could try using the proper sized vacuum hose, but a bit longer, and looping it to keep it from kinking.

Chris in Aguanga

I just had the same issue, but I used a short section of a larger hose to couple with a stepped vacuum fitting, down to the smaller tubing. I had to make a slightly larger loop to ease the squeeze, but it only cost about 3 bucks.