ChrisG 0 Posted February 10, 2008 I was sorting through all my stuff for my engine yesterday and noticed that both the standard throttle bodies I have are slightly different. The main difference I noticed is one has what appears to be an idle screw and the other doesn't, and no threads for one. What is the difference and which is best for me to use when I plonk my engine in??? Share this post Link to post Share on other sites
Baz 421 Posted February 10, 2008 Are you sure the butterflies are actually the same size? Share this post Link to post Share on other sites
DrSarty 90 1 Cars Posted February 10, 2008 If one of those came from me Chris, then I can assure you it doesn't have an idle screw. You can't tinker with idle speed; it's all down to the ECU. Makes me think the other one isn't Mi. Could be wrong though. Share this post Link to post Share on other sites
d-9 0 Posted February 11, 2008 This rings a bell vaugely, think ive seen a couple of different types of MI bodies, one defo had weber cast on the side. Share this post Link to post Share on other sites
davemar 16 Posted February 11, 2008 I've just replaced my throttle body with another one as the old one was leaking air out of the worn spindle holes. The old one was a Weber and you could adjust the end stop of the spindle with a screwdriver. The new unit isn't a Weber one and the end stop doesn't appear to be adjustable, however it does have a bleed-through hole with a screw in stopper in it for presumably adjusting the idle. The non-Weber one also feels like the springs are tighter giving a heavier pedal feel. Share this post Link to post Share on other sites
jackherer 543 Posted February 11, 2008 This rings a bell vaugely, think ive seen a couple of different types of MI bodies, one defo had weber cast on the side. Yes, Weber and the other type is AMC. The differences are fairly minor and both seem to wear fairly badly leading to bad idling. Share this post Link to post Share on other sites
kyepan 291 Posted February 11, 2008 I've just replaced my throttle body with another one as the old one was leaking air out of the worn spindle holes. The old one was a Weber and you could adjust the end stop of the spindle with a screwdriver. The new unit isn't a Weber one and the end stop doesn't appear to be adjustable, however it does have a bleed-through hole with a screw in stopper in it for presumably adjusting the idle. The non-Weber one also feels like the springs are tighter giving a heavier pedal feel. just out of interest, how can you test for leaks? sorry for the thread hijack Share this post Link to post Share on other sites
Mikey S 29 1 Cars Posted February 11, 2008 just out of interest, how can you test for leaks? sorry for the thread hijack remove the airfilter and hold your hand or a piece of cardboard over the intake while its idling, it should stall immediately, if it doesnt you got an airleak somewhere. Share this post Link to post Share on other sites
kyepan 291 Posted February 11, 2008 remove the airfilter and hold your hand or a piece of cardboard over the intake while its idling, it should stall immediately, if it doesnt you got an airleak somewhere. genius.. thanks also back on topic, i've had two MI's, the first had a very light throttle, the second is very heavy.. must have had different throttles. Share this post Link to post Share on other sites
