A month or so ago I swapped in type s ported runners and a type s throttle body and the car ran fine for about two or three weeks except the cruise control plate being broken on the throttle body. Around thanksgiving I as coming off the highway and all the sudden I got a bouncing idle. I put the correct vacuum ports for the type s runners and swapped back to my old throttle body last night. Still the same problem this morning I sprayed everywhere with carb cleaner trying to find the vacuum leak but nothing happened. Anybody have any idea?

 

Upside down gaskets maybe? I know some of the gaskets fit both ways, but only one way is correct.

 

Tried checking that and made sure all the holes longed up perfectly. The weird thing is the car drive fine for a couple of weeks and then out of no where this problem happened

 

No codes?

Sounds like a vac leak, or maybe sticky IAC?

 

No codes I sprayed carb cleaner everywhere trying to find the vacuum leak but nothing. I tried switching iacv because I have a couple of throttle bodies right now but that did nothing

 

I think I might just have to swap back to my stock lower manifold because I've already been without the car for almost two weeks. That's the only other thing I could think it is. I also reused the lower manifold to heads gasket and the lower manifold to top manifold gasket since they were metal. Could that be the problem

 

Could be, I know metals are typically reusable to a point.

As a general rule of thumb, and only because I work on SEVERE duty vehicles every day (Taxicabs, 24/7 roadtime) I replace gaskets no matter what they are made of whenever I tear apart a system, you simply never know when it's gonna die, and downtime for us = loss of major money.

Could also be the areas in question are not mating correctly due to very slight differences, but don't quote me on that, I'm not very familiar with the design or construction of the newer runners.

If your problem were mine, I would start by making the whole system stock again, and if it's still not right, investigate further.

 

Well they were all original gaskets so they had 195,000 miles on them. The type s runners bolt up the same just they have larger openings that were gasket matched. The only bg difference between them was a vacuum port which I switched.

 

Leaks on the Ported Runners + New Manifold?

 

What do you mean you switched vacuum ports?

 

There is a vacuum port on the runners like a upside down "L" on type s there are slightly bigger so I ordered new ones and installed them yesterday. I took a look at my old runners and they had little black prices that looked like they went to the gaskets

 

Te only thing I have on right now is the ported runners and the car drove fine for two or three weeks then out of nowhere it started doing this

 

I've been fighting the same problem on my 2000 TL-P for two years. It's intermittent for me, so easier to live with. I've replaced IACV, TPS, checked for leaks multiple times, cleaned every part on the intake system.......
I think it's a curse.

 

Yeah unfortunately I don't like driving the car with it like this. I ended up taking it to a shop that my dad knows so he can try to figure it out. I am busy with school and work right now so I'm not able to keep messing with it.

 

I had this issue after I installed my CAI. I had left a connector unplugged near the throttle body. Is it possible something came loose or unplugged??

 

There all plugged in I read in another thread that the map sensor and another are the same. I'm wondering if I mixed them up but probably not since the problem came when I was driving and not messing with anything.

 

When I looked at my old runners tonig I noticed that there were little black peices where te gasket goes so I'm wondering if the gaskets aren't sealing all the way

 

What little black pieces?



Also, are the vacuum hoses (8/9) hooked up properly/not torn or cracked

 

#3 is what I replaced. #8&9 had no cracks or tears and slides right on. The little black peices I was referring to looks like its gasket material, There metal but they have some black coating material which is on my old runners

 

It ended up being the iacv who would've guessed I had to bad ones. I put a brand new one on and it went right back to normal. I've been driving it since last Friday.

 

Happened to me before bought a used one and did the same broke my head thinking it was something else Glad u got her back up and running right

 

Yeah I figured it couldn't be that since I swapped it for another one but after we kept searching for a vacuum leak and weren't finding it, I got one from a local autoparts store and but it on and started it up and it went back to normal instantly