1-3-2-4 Posted December 3, 2017 Share Posted December 3, 2017 Yesterday I took my car to Monroe to have a bolt taken off which they could not take it out.. now I noticed I had a rather lumpy idle.. I don’t know if it was because they used a torch on the up pipe? But now the car idles at -20inHg vs the -22inHg I had before.. if I take the idle to 2000 the vacuum gauge will read -22inHg so is this a vacuum leak? I’m going to assume any leak be it from the turbine area of the turbo won’t effect idle or vacuum? Link to comment Share on other sites More sharing options...
lbwilliams44 Posted December 4, 2017 Share Posted December 4, 2017 Any leak anywhere (pre or post charge) can have an effect on your idle/vacuum, so long as it is after your MAF. Does it only effect the idle? Link to comment Share on other sites More sharing options...
1-3-2-4 Posted December 4, 2017 Author Share Posted December 4, 2017 yes only idle Link to comment Share on other sites More sharing options...
1-3-2-4 Posted December 4, 2017 Author Share Posted December 4, 2017 I’m looking at my wideband it’s now at idle around 15.5 where before it would run around 11-12 at idle (no oxygen sensor) so I have some leak coming with extra air or one of my fuel injectors is not spraying enough fuel? I checked all the lines twice so far and nothing popped off but I have to say it’s getting lower with the vacuum it could be when I tuned the injector for scaling I did one voltage range but I can’t see how things changed but then again my exhaust leak got worst after i took the car to the shop for the bolt. Link to comment Share on other sites More sharing options...
aj_mariner Posted December 4, 2017 Share Posted December 4, 2017 What bolt did they put heat on? Link to comment Share on other sites More sharing options...
willg Posted December 6, 2017 Share Posted December 6, 2017 Could be the heat melted a hole in a rubber hose. Use brake clean or starter fluid and spray around hoses and connections in the engine compartment. If the idle spikes, you've found a leak. Be cognizant of fire risks. Link to comment Share on other sites More sharing options...
lbwilliams44 Posted December 6, 2017 Share Posted December 6, 2017 Could be the heat melted a hole in a rubber hose. Use brake clean or starter fluid and spray around hoses and connections in the engine compartment. If the idle spikes, you've found a leak. Be cognizant of fire risks. Don't use Brake Cleaner, you can damage rubber and plastic. I have found using propane to be the best for this, ignites at a higher temperature too. And if you do manage to ignite its just a little flash and done. Link to comment Share on other sites More sharing options...
1-3-2-4 Posted December 7, 2017 Author Share Posted December 7, 2017 I think it might be the injectors.. looking at my AFR at idle it's jumping up and down about 2 points back when I changed the injector latency when I needed to idle I did it for 14V I think it was.. my guess is 1. A vac leak I over looked (I have a propane torch) 2. My voltage range changed and my injectors are on what would of been the stock as I changed only one range of voltage 3. A injector is not spraying right at idle.. Once you are off idle and over 2K it's rather normal idle is the issue I don't want to mess with much now until Friday well Saturday I can install new gaskets for the exhaust so I can take that out of the factor Link to comment Share on other sites More sharing options...
aj_mariner Posted December 7, 2017 Share Posted December 7, 2017 Call me ignorant, but how does an exhaust leak mess with idle? Link to comment Share on other sites More sharing options...
ehsnils Posted December 7, 2017 Share Posted December 7, 2017 Are the donut gaskets replaced? That's one cause for vacuum leaks. Link to comment Share on other sites More sharing options...
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