Guest NathanMcbeath94 Posted August 8, 2016 Share Posted August 8, 2016 Hey guys, recently my car will just die if I start it up when it's at operating temp, it sounds a bit rough at cold idle but won't cut out. The afr is at a perfect 11.4-11.7 at wot so no issues there. At a loss to what it could be, also a whining noise coming from engine on cold start. Altentator gone?? Any suggestions would be helpful. Quote Link to comment Share on other sites More sharing options...
np89 Posted August 8, 2016 Share Posted August 8, 2016 Water temp sensor? Any codes stored? Quote Link to comment Share on other sites More sharing options...
drift_bear Posted August 8, 2016 Share Posted August 8, 2016 Check for stored codes and see if it has anything, could be a few things though. I had a hot start issue and changed a lot of sensors and it helped. Quote Link to comment Share on other sites More sharing options...
Style Posted August 8, 2016 Share Posted August 8, 2016 Did you not post a dyno thread recently that pointed to the second turbo acting up? Could be that a vacuum leak has gotten worse and the car is struggling to idle. It'll overfuel when cold so that may be the reason it's coping when cold. Whining could be power steering pump. Have you checked the level? Not meaning to insult your intelligence but I had the same issue for weeks and it turned out to be low PS fluid Quote Link to comment Share on other sites More sharing options...
Guest NathanMcbeath94 Posted August 8, 2016 Share Posted August 8, 2016 Yeah but it got low results as it was tested on stock boost, I had the boost controller wired up to come on when the sidelights were on and he never knew that, he just thought it wasn't working. And yeah I heard the power steering when I turned the steering wheel whilst not moving and sounded like it was low but checked fluids and it was fine, thinking its maybe the pump if I have a issue with it! Quote Link to comment Share on other sites More sharing options...
np89 Posted August 8, 2016 Share Posted August 8, 2016 Yeah but it got low results as it was tested on stock boost, I had the boost controller wired up to come on when the sidelights were on and he never knew that, he just thought it wasn't working. And yeah I heard the power steering when I turned the steering wheel whilst not moving and sounded like it was low but checked fluids and it was fine, thinking its maybe the pump if I have a issue with it! /QUOTE] Who the fcuk wired that like that Quote Link to comment Share on other sites More sharing options...
Guest NathanMcbeath94 Posted August 8, 2016 Share Posted August 8, 2016 Was like that since I had it haha.. I rewired it too my ignition after that Quote Link to comment Share on other sites More sharing options...
Style Posted August 8, 2016 Share Posted August 8, 2016 Yeah but it got low results as it was tested on stock boost, I had the boost controller wired up to come on when the sidelights were on and he never knew that, he just thought it wasn't working. And yeah I heard the power steering when I turned the steering wheel whilst not moving and sounded like it was low but checked fluids and it was fine, thinking its maybe the pump if I have a issue with it! /QUOTE] lol nice, high and low boost settings on the sidelights First turbo was making 1.1bar though in the graph? Soon as the 2nd turbo came on the boost dropped to about 0.95bar which is still well above the 0.8bar stock boost. All kind of points to an air leak somewhere I think Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted August 8, 2016 Share Posted August 8, 2016 Last time one of my alternators died on me it was making a terrible screeching sound from engine bay, if it's that then you would know pretty quickly. Half the supra's I see these days have the power steering whine. Even if your fluid is full, if there is any air in the system then it creates a slight whine when the pump is under load. All it takes is a slight leak somewhere on the PS system (which isn't hard to believe given their ages these days) and you get the sound. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 8, 2016 Share Posted August 8, 2016 I would check for, in no particular order, weeping injectors, failed fuel pump none return valve, failing engine coolant temperature sensor (the one with 2 wires going to it), failed or failing plenum air temp sensor, and then the less likely no or low signal from the crank or one of the cam position sensors. I assume it's a TT on a stock ecu? If it has an HKS fuel cut eliminator I would try removing it, they can also show this issue. Quote Link to comment Share on other sites More sharing options...
Guest NathanMcbeath94 Posted August 8, 2016 Share Posted August 8, 2016 thanks il check all that, it's a TT with stock ECU and greddy emanage piggyback Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 8, 2016 Share Posted August 8, 2016 thanks il check all that, it's a TT with stock ECU and greddy emanage piggyback /QUOTE] Why is it using / needing the piggyback? Now you have mentioned it I would move it to numero uno as the suspect. Remove it and see if the problem is fixed. Quote Link to comment Share on other sites More sharing options...
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