CAMarten Posted October 21, 2009 Share Posted October 21, 2009 I am the proud owner of a '78 280z with an L28ET out of an '82. I'm still getting things adjusted in the fuel injection area (the bible really is a life saver). But I've found an area that doesn't seem to be covered and need some wisdom. The previous owner has removed the air regulator and put the hose straight from the valve cover to the throttlebody. Is this some kind of mod? would that cause any problems (currently the mixture is still not adjusting right). If you have any insight please help me out- I can't find any useful information anywhere on what it even does! Quote Link to comment Share on other sites More sharing options...
TrumpetRhapsody Posted October 21, 2009 Share Posted October 21, 2009 The air regulator allows a higher idle to be obtained when the car is cold. Running a hose from the valve cover to BEFORE the throttle body shouldn't be an issue, but if it's AFTER the throttle body it would definitely cause some problems. Quote Link to comment Share on other sites More sharing options...
CAMarten Posted October 22, 2009 Author Share Posted October 22, 2009 The hose enters directly into the top of the throttle body. I'm not sure if it is before or after the butterfly, I will have to take it apart to find out. Thanks for the info. Quote Link to comment Share on other sites More sharing options...
sticky280zx Posted October 22, 2009 Share Posted October 22, 2009 can we get some pics of what youre talking about? Quote Link to comment Share on other sites More sharing options...
BunnySlippers Posted October 22, 2009 Share Posted October 22, 2009 I was trying to edit my last post on here to correct something, but it wasn't letting me, so I deleted it and here we go. With more this time as well. The air regulator has a reed valve that closes when it gets hot. So on cold starts its open, allowing auxiliary air past the throttle body into the intake manifold, thus raising the idle. Its basically a fancy choke. Once it warms up, it closes. On my S30 there are two air connections on the throttle body, one before and one after the butterfly valve. Is that the same for the S130 motor? If so, and the air regulator has been removed, I would say make block off plates on the throttle body, get rid of the hose all together and put a small filter on the valve cover. I know the 280Z, and 280ZX FI system can be really finicky, especially when parts are removed. A good, and very reliable option is to switch to the Z31 FI system. Quote Link to comment Share on other sites More sharing options...
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