Thread: Issue after intercooler install, car revs high then drops way low

I just finished with my intercooler install, zzp stage 3 IC, vw radiator. Now when i go to start the car it will run but the idle is all over the place. It keeps reving up to almost 3k then dropping into the 600's where the engine sounds bad and almost dies. It does the same thing if i shift it into neutral. Checked my spark plugs, all my sensors, currently have the MAP unplugged because i was testing the fuel regulator. When the MAP was plugged in it was reading up to 100 KPa when the idle dropped into the 600's. I did not see any codes go off on my scanner.

For the install i also used a new modified LIM in case that matters.

Here is one of my scans without map sensor plugged in.

sounds like a huge vac leak.

I'd say vacuum leak or pcv blocked off

I'll venture a guess you used a garlock gasket or two.

Only used rvt no gaskets were used between lim and ic and ic to sc.
I'll keep checking for vac leaks, thanks.

Are you sure you sealed it up good with rtv? Did you change the lim when you installed the ic?

I agree, huge vacuum leak

Yeah I changed the lim with the install. Guess I'm pulling it apart and resealing everything.

Look harder. Dont need to rip it apart, maybe a vaccum line cracked or something

Took it apart, seems I was weak with the rtv few spots were definitely not sealed, I did double check the vac lines first and found nothing amiss. Thanks for the help, will let you know tomorrow if is runs after I let the rtv dry.

Look at you Letting it sit lol, I lay the **** down, go inside shower eat and start it haha

That's crap ^^ I lay it down, by the time you have it together enough... turn the key. That's my way.

That works too!!! I'm usually just honey lol

RTV is Aerobic, and dries by air, correct?

What I did for my blower, is used a lump some of Copper RTV, set the blower on, put all the bolts in by hand then let it set for an hour. So it can dry. Then after an hour or so, I bolted it down tightly and havent had a Vacuum leak from it in about 11 months.

That is the wrong way. Surprised that worked lol

Worked for me

In that case, don't take my advice. Lol

Started the car up and it's doing the same thing, only this time there is also a high pitched whine/squeel to go along with it.