240zprace Posted December 31, 2003 Share Posted December 31, 2003 i,m helping my buddy adjust his AFM, cause his car is bogging alot. i adjusted the tooth wheel inside the afm, but there's two screws located on the outside to adjust the air by pass. now there's one in the front by the cover and on the opposite side there is another screw. after i did the adjustment to the toothed wheel inside, the car is still bogging alot. right on 1st gear, if i give it gas, it will just bogg like air/fuel mixture isn't right. does the air bypass screws have something to do with this or the afm is bad. timing is set at 10 deg btdc, vac.advance line is not used. please help if anyone knows this problem.. thanks.. Quote Link to comment Share on other sites More sharing options...
datsunlover Posted December 31, 2003 Share Posted December 31, 2003 Could be a toasted AFM... or maybe the TVS (throttle valve switch) is out of order. (People usually call it a -Throttle position sensor- nowadays, but the Datsun maual calls it a TVS...because its NOT a sensor; its actually just two switches...) At idle, it is on the first contact, and after a ceartain amount (%) of throttle, it switches to another. There are two screws hoding it to the throttle body and once loosened, it can be rotated a bit for adjustment. From what I have found, there was a recall of some sort, or a dealer adjustment for these back in 76 I think... . maybe the car your working on missed it? Or possibly the switch is just bad and you'll need a new one. Try adjusting it a bit first though.. Quote Link to comment Share on other sites More sharing options...
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