I just got the car put back together and got it running but right when i start it up the rpms shoot up to 3-4k. I took the intake manifold off took apart the throttle body and got them power coated over this winter. I have already checked for vacuum leaks went as far as taking the intake completely off to double check things. I have checked base timing. I have tested my iacv and it reads good ohms. I have tried to change things in tunerstudio under the idle valve but nothing changes when i mess with that. I also have check to make sure my throttle body cable was not to tight. My boost gauge reads good pressure.I dont think its somehting in my tune becasue when it try to edit anything in regards of my idle nothing works properly. I am really starting to run out of idea and want to get this car on the road. Is there anything else I can check to solve this problem of mine.

 

The throttle body was powder coated? Was the IAC removed? Usually parts are sandblasted prior to powder coating, so who knows where all that debris went. It's generally a bad idea for any engine parts.

 

3-4,000 RPM. Is a large vacuum leak. I doubt it’s a minor gasket leak.
Did you remove the EGR valve or possibly it’s stuck open???
Or... possibly the PVC hose is not connected?

 

Yes I removed the IAC when It was power coated. Could there be something wrong with the Air valve on the side of the IM that was powercoated as well

 

I checked for leaks. I just replaced all vacuum lines I have triple checked ever line possible and every gasket seal at least twice. I have a 1.6 do they have an egr valve?

 

Came to see an engine massive enough to idle at 3-4 RPMs, left disappointed.

Good luck on your vacuum leak. Didn't lose any spark plug gasket thingy's, did you?

 

Screw in the bleeder on the throttle body.

Use brake or carb cleaner to find the leak.

Hopefully none of the flat mating surfaces of the intake and TB were coated or you will be very busy with a paint scraper for many hours. Every surface where two components are joined should be powder-free. IM-head, IM-TB, IM-air valve, TB- IAC, TB-TPS, interior bore of TB, bleeder passages of TB, etc., should have no powder.

You probably misaligned or misoriented the throttle plate.

 

What do you mean by throttle body plate? the gasket? All of the mating surfaces are clean and dont have pc on them.

 

ik that all of the flat mating surfaces u listed and cleaned with no powercoat. But i am confused on what u mean by throttle body plate.

 

Aka the throttle butterfly

 

There is an adjustment screw for it and the cable could have no slack, etc.

note also that you keep inserting the word ‘body’ that Six did not type.

DNM

 

Throttle plate has a front and back if removed and reinstalled backwards or if reinstalled ever-so-slightly off of original orientation...trouble.