grocery_getter
Well-known member
Quoting EgonOlsen:
I just checked the Biss screw. its all the way down. I took it up just a notch to check and the Idle got even higher.
So thats prolly not it, it cant go lower than it already is.
Boost leak check that car. You either have a vacumm leak at manifold to head gasket, leak at injector to head insulator, leak from any of the vacuum hose that branches off the manifold or any of the TB gaskets or an internal leak at the TB assembly that lets air bypassing the TB plate. I just dealt with the same problem with a car here, even with the BISS set all the way down the lowest rpm I could get was 1200 rpm. Sent the TB to throttlebodys.com for a quick rebuild (it was leaking massively from the shaft seals as well) and when I got it back its still doing the same idling high thing. I took off the lower portion of the TB and install a block off plate and the rpm went down to the normal range. Must have problem with the ISC pintle sealing its bore or the FIAV internal bypass leak.
I just checked the Biss screw. its all the way down. I took it up just a notch to check and the Idle got even higher.
So thats prolly not it, it cant go lower than it already is.
Boost leak check that car. You either have a vacumm leak at manifold to head gasket, leak at injector to head insulator, leak from any of the vacuum hose that branches off the manifold or any of the TB gaskets or an internal leak at the TB assembly that lets air bypassing the TB plate. I just dealt with the same problem with a car here, even with the BISS set all the way down the lowest rpm I could get was 1200 rpm. Sent the TB to throttlebodys.com for a quick rebuild (it was leaking massively from the shaft seals as well) and when I got it back its still doing the same idling high thing. I took off the lower portion of the TB and install a block off plate and the rpm went down to the normal range. Must have problem with the ISC pintle sealing its bore or the FIAV internal bypass leak.