Fox 3 Posted November 10, 2008 In this cold weather my car fires up fine, it idles around 1200 when first fired up, then the problems start... After two or three minutes of driving, it idles at 2k. it does this for about 20 minutes, then drops to about 1200, but fluctuates up and down badly. After this is settles down to about 1500, and runs well. Now, I assumed this was the SAD, but after removing the sad hose and blocking the hole into the TB it makes no difference, it seems the SAD makes no difference at all. What could this be? A possible air leak? Its really starting to get on my wick Share this post Link to post Share on other sites
welshpug 1,627 Posted November 10, 2008 which hole into the t/b are you blocking? the SAD doesn't feed into the throttle body. check for air leaks, mainly the inlet manifold gasket, and the oil filler pot securing stud, and the brake servo hose, if none of the above show any signs of leaking it may be a worn AFM, or a worn throttle body. Share this post Link to post Share on other sites
Fox 3 Posted November 10, 2008 which hole into the t/b are you blocking? the SAD doesn't feed into the throttle body. check for air leaks, mainly the inlet manifold gasket, and the oil filler pot securing stud, and the brake servo hose, if none of the above show any signs of leaking it may be a worn AFM, or a worn throttle body. Sorry, I ment the plastic pipe between the AFM and TB Whats the oil filler pot securing stud? I picked up a TB from ebay, but it seems to be the older type Share this post Link to post Share on other sites
nick 3 Posted November 10, 2008 I would check the obvious first, such as the throttle cable sticking, throttle butterfly sticking/gummed up and any sort of air leak (even a badly sealing dipstick can cause a bad idle) Nick Share this post Link to post Share on other sites
Fox 3 Posted November 10, 2008 throttle butterfly sticking/gummed up Didnt think of that, will whip it off and give it a clean up with some carb cleaner... Share this post Link to post Share on other sites
tri_longer 25 Posted November 10, 2008 Let us know how you get on as mine does the same and i've tried all sorts to locate the problem. Share this post Link to post Share on other sites
Fox 3 Posted November 10, 2008 Let us know how you get on as mine does the same and i've tried all sorts to locate the problem. Have you wound the idle screw all the way in, and it still wont idle slow enough? Must be an air leak... Share this post Link to post Share on other sites
mhyphenl 10 1 Cars Posted November 10, 2008 Have you wound the idle screw all the way in, and it still wont idle slow enough? Must be an air leak... You probably need to make sure the throttle position switch is properly set also, this caused all sorts of problems on mine, particularly being erratic and fluctuating on idle, one minute 15 -1600 then 1200 etc! In the end most of the sensors will have an effect but the worst is air leaks. You need to start with the inlet manifold and work outwards methodically. The bolt in question is meant to hold the oil filler tube in place but the plastic often breaks!! Make sure somthing is in every hole in the airways. (something I don't recommend in your own airways. ) Share this post Link to post Share on other sites
Mikey S 29 1 Cars Posted November 10, 2008 a can of brake cleaner sprayed on the inet system will soon diagnose any air leak problems. if there is an airleak the revs will rise. Share this post Link to post Share on other sites
