Hi all...
Ok sooooo I can't find this vac leak. I know I have a vac leak for two reason.
1. My idle once the car is warm goes up and down up and down up and down and the car even turn off sometimes.
2. If I spray starter fluid on the block off plates area, the idle goes up and the car holds idle for a couple seconds.

So, obviously there is vac leak over there, but I have already took off and re RTV'ed all the block off plates, took off and on and re RTV'ed the UIM, and checked all the hoses. Problem is the vac leak is still there, and I CANT FIND THE DEVIL!

Any ideas on what else I should check? It's driving me crazy!

 

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/water-sensors-water-pump-diff-models-583211/ check out post 11 and onward. thats the best way ive found to do it. really spraying around your engine doesnt pinpoint the problem very well. check your tps too, it might also be part of the problem.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/howto-rough-idle-diagnostics-672127/

 

yaaaaa I knew about that....
I guess I am going to have to do something like that.

I might try something a little more ghetto / cheap. (just an idea)

Where the cold side of the intercooler connects to the elbow that goes into the thingy (haha) with the temp sensor on it, im going to try to make something that can be clamped into there. I might try a couple layers of duct tape first. Then spray soapy water all over the other side of my engine and have someone blow air into the other side. I hope it works I miss my idle soooo much!

 

dont forget to check your tps. surging is most commonly related to that. although a vac leak can cause it to. you probably want to put air before that point you described, im pretty sure alot of people have had trouble with the turbo inlet duct cracking and becoming a vacuum leak. i would put air right after the afm if possible.

 

its not the tps is I can spray starter fluid and it revs up.

 

Your thread title is ******* hilarious.

 

I dunno, I thought I had a monstrous vac leak until I went through and replaced ALL my vac lines. Then I realized my tps was just misaligned. Also, my TB was sticking a little, so I sprayed some WD-40 on the mechanisms and that helped too. I would definitely check your tps if I were you, those bastards go out of alignment all the time for no reason

 

wow thanks for the help. If I could get 10 more people to tell me its the TPS then maybe I will go back outside, and RE calibrate the TPS. (It's set perfectly STOP SAYING ITS THE TPS!!!!) I dont care how messed up the TPS is if you can spray starter fluid around (other than on the filter) and the rpm changes ITS A VAC LEAK! AHHHHHHH

ninjas!

Anyways I went and got all the parts to pressureise the intake right after the AFM.
I have done it about 30 times now and found little tiny leaks here and there fixing them as I go. Now it holds idle (so I fixed it enough) but the idle still bounces from 1 major vac leak hiding somewhere. (NOT THE TPS Dont say it DONT!) cause I can still spray starter fluid on the pass side of the engine and it revs up. My last chance before I take off the turbo, UIM, and LIM to re gasket and rtv the LIM, is take off the UIM and make sure the injector bleed, and FPR hoses are still connected to the LIM.

I will do that later today after the car cools down. I hate working on a hot car!

 

It could be the hoses going to the oil injectors. That was the source of one of the vac leaks on my car. If you are spraying in that area it could be getting under the UIM where those are located.

 

yaaaa the engine finally cooled and I was able to take off the UIM. The FPR hose was disconnected at the UIM, and 1 of the oil injector .... um.... bleeder (?) lines was off. I was only able to zip tie the FRP line and the one oil injector line. I hope this works good for now. I'm waiting for the RTV to dry and I'm going to head out for a test drive.

Wish me lucks.

 

WOOOOOOOOOOOOHOOOOOOOOOOOOOO!!!!

WHAT A DIFFERENCE!!! omg Seriously, I donno if its the no vac leak or having a working FPR (my money is on the FPR ) but holy smokes does it pull now! The whole RPM range is smooth and it feels like it just keeps on pulling! geeesh!

Also the idle is like a newborn baby tiger purrrring. The NA's exhaust defusers and the turbo seem to really take the pop out of the exhaust, and its more of a deeep fast repeating thump. I like it.

I'm all smiles. Loving it.

Lesson I learned : FIX YOUR VAC LEAKS! Take your time and make a vac tester and test RIGHT after the AFM. I was suprised how many little vac leaks I had. Crazy.

Something weird now .. (no clue why it does this) ... now when I spray starter fluid around the engine the idle goes down... just a little bit, you have to really listen for it but ya.

Anyways THANKS ALL SO MUCH! I <3 my rx7 again! (I never hated it just was starting to get annoying driving with my heal on the gas all the time when ever stopped.)

Thanks
~Tweak

 

NO REALLY!?

i was suggesting you had more than one problem. i told you howto test for vac leaks and said you should also test the tps.


hmm howd you come up with that one.