What is this part? [Archive] - GrandAmGT.com Forum

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theblackesteyes
03-12-2011, 10:53 AM
Hey guys, after I finished changing my plugs and wires this morning I noticed a broken tube/wire. It's the black tube in he pic. I'm hoping someone can tell me what this part is and if it needs to be replaced immediately. I have no idea if this part was broken before I started on the plugs and wires or if it broke during the process. The car ran fine before I got started and did so after I was done. Thanks

AaronGTR
03-12-2011, 11:50 AM
YES!!! You absolutely have to get that fixed!!!

That is the vacuum reference tube for the fuel pressure regulator and also the MAP sensor. If that is disconnected, your fuel pressure is running at max all the time instead of going up or down with the throttle. It's going to throw your fuel trims off, so it will hurt your gas mileage and eventually it will hurt your O2 sensor and catalytic converter as well.

theblackesteyes
03-12-2011, 03:32 PM
Thanks. I did some checking online and can't find a direct replacement for that plastic vaccum line. Can it be replaced with regular rubber vaccum line and if so is there any PSI requirements that need to be met?

pontiacgt05
03-12-2011, 03:35 PM
I broke the same one when installing my intake. Just slipped a rubber sleeve around both ends. You have to make sure the sleeve is air tight though.

AaronGTR
03-12-2011, 05:27 PM
Thanks. I did some checking online and can't find a direct replacement for that plastic vaccum line. Can it be replaced with regular rubber vaccum line and if so is there any PSI requirements that need to be met?

Hehe, well you aren't boosted so no, there are no psi requirements. :P It should be air tight though since it has to hold vacuum. You can simply splice it together with a small piece of rubber tubing as long as the inside diameter is a close fit over the outside of the plastic tube. You can put a little supper glue on it or some RTv sealer around the outside as well if you want to make sure it's air tight and not going to come off.

theblackesteyes
03-12-2011, 05:32 PM
Thanks again for the help...I really appreciate it.

theblackesteyes
03-13-2011, 03:32 PM
Made the repair this morning and everything looks to be ok. Just curious, if my splice isn't air tight will I get a SES light or some other kind of indication that things aren't OK?

AaronGTR
03-13-2011, 05:19 PM
If it's a really minor leak, no probably not. If it was big enough to cause a check engine light then you'd be able to tell anyway from how the engine was running. Big vacuum leaks usually cause high idles.

I wouldn't worry about it though. It's a pretty hard fix to mess up, and it's not like there are super high vacuum pressures for it to hold. It should be fine.