FreddyZ78 Posted November 15, 2013 Share Posted November 15, 2013 Recently my 78 280z's idle has dropped from its usual 900-1000 to 500-600. I heard a whistling sound from some cracked hoses on the top of the intake and replaced those and it didn't effect anything. When I give it throttle it pops then the oil pressure goes up to about normal operating pressure then it runs normally for a while. That is until I shut it off and restart it but it still pops a lot more. What can cause this? Quote Link to comment Share on other sites More sharing options...
cockerstar Posted November 16, 2013 Share Posted November 16, 2013 Popping through the intake can indicate a lean condition or timing issues. What changed between it running fine and running rough? I would start by verifying base timing and checking that the injectors are all firing. Quote Link to comment Share on other sites More sharing options...
FreddyZ78 Posted November 16, 2013 Author Share Posted November 16, 2013 It would pop randomly when I would accelerate from a complete stop and it just got worse then the idle dropped, I dont know what's causing it to lean out if that's what it is. Quote Link to comment Share on other sites More sharing options...
morbias Posted November 17, 2013 Share Posted November 17, 2013 Sounds like you still have a vacuum leak Quote Link to comment Share on other sites More sharing options...
IncompetentOne Posted December 3, 2013 Share Posted December 3, 2013 If it has an EGR hose from below the intake be sure to check it. They rot often. Also, check the rubber section in between the air flow meter and the intake. Good luck! Quote Link to comment Share on other sites More sharing options...
9rider Posted December 4, 2013 Share Posted December 4, 2013 If it popping and exhaust sound like " turbo " then it may be one of injector connection lose. Quote Link to comment Share on other sites More sharing options...
IncompetentOne Posted December 15, 2013 Share Posted December 15, 2013 I agree with 9rider. Let the car run, and remove each injector plug while the car is running. When you get to one of the plugs where nothing happens when you remove it, there's your problem. Good luck! I just did this today and it was because my second injector connection was loose Quote Link to comment Share on other sites More sharing options...
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