As many of you know, I have been working on a right hand drive conversion. When I parked the car 8 months ago, she ran fine...

I finally got the conversion done enough to start the car and had a couple of issues show up...

During the conversion, I swapped my RK intake over to an AEM CAI and had the TB ported. When I fired the engine up, we noticed the RK header was glowing red. I shut the car off and checked for obvious fixes. The only thing that I can conclude is that I'm running lean. These are my current engine mods:

AEM Cold Air Intake
Ported TB
Comp Cams
GM Adjustable Cam Gears
Ported and Polished Head
RKSport 4:2:1 Header
Magnaflow Dual Catback
RKSport Ecotec Upper Engine Mount
RKSport Lower Engine Mount
Hand Polished Valve Cover
Optima Yellow Top
Custom Wire Loom and Engine Accents
Removed Intake Resonator (Bong)
Removed AC
Removed Washer Fluid Reservoir

Could the change of intake and TB REALLY make me run lean enough to turn the header colors? (The car has 5704 miles on it.)

Second, my idle is too high. She is idling at roughly 12 when I know idle should be at 8 or 9. I checked my accelerator cable and there is a bit of slack, so it's not like the butterfly isn't closing... Is there ANYWHERE to adjust the idle on the Ecos???

Thanks for any help in advance...

By the way, I threw a PO507 code, so I know the engine sees the idle as too high also...

when you got the TB ported, are you sure that the butterfly plate seals correctly. Air might be bybassing it somehow and making it idle higher.

or you can try moving the idle screw. if its to high it will open the TB a little and air will go through at idle.

the other question i can't answer

I dont see an idle adjusting screw anywhere on the TB... And from what I can tell the butterfly seals correctly...

Sorry I don't have an ECOTEC, so I have no more advice. just the obvious

there should be an idle screw along the area where the throttle rotor touches the tb. open it by hand, and when it closes look outside the TB for what stops it from going PAST closed. its usually a 5 star screw that adjusts to control idle.


also are there ANY large holes inside the TB? from boring it?


and then whats up with your O2 sensor and iat sensors?

I will have to pull the intake to look a little closer for the adjustment screw... As far as holes, the TB looked fine... I know a vaccum leak is another possibility, but I don't see where I would be getting one.

As far as the sensors, the only CEL I got was for a high idle... Although, I am certainly aware a bad O2 would make for a lean mixture... What are the chances the car ran perfectly, sat for 8 months and had a sensor go bad during the down time???

i have this exact issue with my car right now and its because my butterfly plate doesnt fit perfectly in the TB bore and it cause a leak and high idle, and running very lean (wideband proven) and my plate is only .0015 of an inch to small. check your plate to TB clearance if not its almost def. a vaccum leak.

hope that helps and good luck



04 sunfire auto, mid 15's n/a, and still going

So you can't drive until you get a new plate done???

Well, it looks like it is the butterfly. I adjusted the idle screw and nothing changed. I borrowed a friend's TB and the engine purred at 900 RPM with a mild lope from the cams...

I emailed Ruben at Bolt On / Reveco to see what his solution will be...

you can drive it until you get a new plate but dont go WOT or be hard on it.
my temp fix for now is duct tape along the walls to seal it lol but it works until i get the new plate. and yes i know its not to smart but its holding just fine and its not throwing codes or running lean anymore



04 sunfire auto, mid 15's n/a, and still going

My car can sit until I get a working replacement... Ruben is sending one as soon as he recieves the one I have... We'll see how the new one works...

I should be getting the replacement TB today. Cross your fingers for me...

I installed it and the same thing happened... The car idled between 1000 and 1200 RPMs. I will be swapping my sensors to make sure they are not the problem. If they are, then great, but I dont see how they would go bad from sitting...

my buddy's 2.4 in his Grand am did the whole exhaust super hot and was kicking codes left and right with a funky high idle ended up being the plugs and the tower was junk. don't think thats your problem though.

No, I know it's not. Since I changed the ported tb with a stock one and the problem was fixed, I know it's the tb.