BobbyZ Posted March 30, 2008 Share Posted March 30, 2008 Hi all, I am still trying to get my 280zx turbo running well. When I first start the car (when it is cold) up it surges and bucks a little bit and then will start to run a little better. If I hit the gas, then the revs drop a little and it starts to stall. When it hits boost like this it makes a very loud whistling noise. Eventually when the engine is really hot, the sound will go away. All of this seems to point to a leak in the intake somewhere. Listening around the engine bay at idle it just started another noise which sounds like a loud vibration (maybe air moving past something that is rattling). This sound seems to be coming from the intake manifold near the head. My conclusion is that the intake manifold gasket has a leak somewhere, maybe the P.O. didn't tighten up the bolts enough. Once the head gets hot it will expand and seal against the intake manifold. Does this make sense to anyone else? My plan is to remove the intake manifold to replace the gasket tomorrow. If I do remove the intake manifold, is there anything else I should look at while I am in there? Quote Link to comment Share on other sites More sharing options...
savageskaterkid Posted March 30, 2008 Share Posted March 30, 2008 Mine was similar, and it had a broken intake bolt. Quote Link to comment Share on other sites More sharing options...
roger.svoboda Posted March 30, 2008 Share Posted March 30, 2008 pull the oil filler cap when its idling and see if it runs worse. If it doesn't then you have a big vacuum leak. It does seem like you may have something in the plenum that is leaking. Quote Link to comment Share on other sites More sharing options...
rdsk8ter Posted March 30, 2008 Share Posted March 30, 2008 dont know if it will work on these cars (fuel injected) but on my jeep when I had to find a vaccume leak I was showed a awsome way. A propane torch not lit but the gas coming out follow all the lines with the car running listen for the idle to change and your leak is right there. worked great on my jeep but again Ive never done it on the fuel injected but it might work. Might be worth a shot. Quote Link to comment Share on other sites More sharing options...
BobbyZ Posted March 30, 2008 Author Share Posted March 30, 2008 Well I think I am going to go ahead and replace the gaskets. It might be something else but this is the only idea I have. Does anyone have any suggestions for other stuff I should do while I have the manifolds off? Other gaskets to replace? Quote Link to comment Share on other sites More sharing options...
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