chopstic Posted March 15, 2009 Share Posted March 15, 2009 After my 280z is warmed up it has a hard time restarting and runs VERY rough for the first few minutes. I've been told that I am missing the heat shield, and because of this the injectors are getting heat soaked and thus causing the problem. Does anyone have a picture of the heat shield i need? Quote Link to comment Share on other sites More sharing options...
Gilli Posted March 15, 2009 Share Posted March 15, 2009 My 2 Cents: If it runs very rough for the first few minutes the injectors would not be running rough because of them being 'heat soaked' because it couldn't reach that high of a temperature that quickly. Check to make sure the injectors aren't touching anything that could possibly be making them heat up abnormally. Quote Link to comment Share on other sites More sharing options...
Challenger Posted March 15, 2009 Share Posted March 15, 2009 He said he has already warmed the car up. Also why would the injectors "cool off" (if it is heatsoak) after a few minutes of running? Quote Link to comment Share on other sites More sharing options...
Gilli Posted March 16, 2009 Share Posted March 16, 2009 VERY rough for the first few minutes. He said in the first couple of minutes. Quote Link to comment Share on other sites More sharing options...
srbigbutt Posted March 16, 2009 Share Posted March 16, 2009 I have this same problem, but I don't think its the injectors that are the issue. I think its the fuel inside the rail and fuel lines that begin to boil and air bubbles begin to form. It runs like crap until they go away. Just my opinion of whats happening. I'm also missing a heat shield. Quote Link to comment Share on other sites More sharing options...
Challenger Posted March 16, 2009 Share Posted March 16, 2009 He said in the first couple of minutes. So, does he mean: "once my car is warmed up and I try to restart it, it doesnt want to start and will run rough for a few minutes." OR... "my car runs rough for the first few minutes till its warmed up, then it has a hard time restarting." Seems kind of obvious to me that its the first one or he isnt communicating very well. If he means what he wrote, when the fuel isnt moving it will pick up alot of heat from the engine compared to the fuel continually being run through the lines, through the tank, etc. So when he stops the car and goes to restart it the fuel has gotten hotter and as srbigbutt said, the fuel can boil until it has cooled off sufficiently by running through the fuel system. Thats my best guess. Quote Link to comment Share on other sites More sharing options...
Nizm0Zed Posted March 17, 2009 Share Posted March 17, 2009 so, for a test, why not get some heat resistant matting, and wrap your fuel rail in it. Insulate it from the heat, to try an eliminate any fuel boiling issue. If that works, either replace the heat shield, or look for a more permanent insulation method. Quote Link to comment Share on other sites More sharing options...
ktm Posted March 17, 2009 Share Posted March 17, 2009 Vapor lock. He says "restarting" after warming up. Quote Link to comment Share on other sites More sharing options...
chopstic Posted March 17, 2009 Author Share Posted March 17, 2009 correct... it only happens when the engine is already warmed up.... like when i stop to get gas and then restart it afterwards. Quote Link to comment Share on other sites More sharing options...
skib Posted March 17, 2009 Share Posted March 17, 2009 correct... it only happens when the engine is already warmed up.... like when i stop to get gas and then restart it afterwards. try wrapping your rail in some heat wrap, thats what I did for my L26 Quote Link to comment Share on other sites More sharing options...
srbigbutt Posted March 17, 2009 Share Posted March 17, 2009 try wrapping your rail in some heat wrap, thats what I did for my L26 I tried this but don't think I did a very good job. Stock rail is very akward to wrap. I ended up taking it off because it didn't work and I didn't like the way it looked. I will probably soon be getting a new aftermarket fuel rail and see if that helps. Quote Link to comment Share on other sites More sharing options...
PanzerAce Posted March 17, 2009 Share Posted March 17, 2009 Wasn't this the reason that some L28s had that air pump to cool down the injectors? Quote Link to comment Share on other sites More sharing options...
TimZ Posted March 17, 2009 Share Posted March 17, 2009 Wasn't this the reason that some L28s had that air pump to cool down the injectors? Yes it is. Quote Link to comment Share on other sites More sharing options...
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