Brentd Posted January 5, 2014 Report Share Posted January 5, 2014 Ok that's what I thought so the tuner can control it and adjust it then but again why would the brakes stiff up and pedal feel hard going back to the vacuum issue I'm thinking that I can't figure out.. Technically an iac being stuck in an open position when pulling off the throttle and immediately to the brakes could be a source of a vacuum leak at least for a short time. I dont know that it could be so much of a leak that the brake booster could lose enough vacuum, but even a small leak can screw things up...i would definately say that it is well worth it to check your booster hose for cracks or if it seems brittle, but it could be either one. Dont want to send you on any wild goose chases, would rather give you a few simple things to check...the iac can and should be cleaned, especially if you notice any surges or stalling, but a vacuum leak should also be looked into on your booster line. Quote Link to comment Share on other sites More sharing options...
Brentd Posted January 5, 2014 Report Share Posted January 5, 2014 Computer controls it, cable driven has a plunger style tps. Sorry i meant iac not tps lol Quote Link to comment Share on other sites More sharing options...
Badbowtie247 Posted January 5, 2014 Author Report Share Posted January 5, 2014 brake booster hose looks fine no cracks or anything but theres no iac on drive by wire only on cable driven which I have drive by wire with the ls3 tb so how would I clean it I check the tps plug and that looks fine to.. Quote Link to comment Share on other sites More sharing options...
Brentd Posted January 5, 2014 Report Share Posted January 5, 2014 Im sorry man..I was getting confused on who was asking...no iac on drive by wire, you are correct. Stalling could be in tune, brakes could be an issue with the booster itself, or possibly a crack in the connection to the intake manifold. Most likely a vacuum leak. Think you can have a vacuum test done with smoke to check for leaks. There may be an issue with the tps sensor not working the throttle plate correctly or possibly in the tune if tps tables were adjusted improperly, maybe the throttle body isnt closing enough when letting off gas and vacuum is leaking when hiting the brakes. There are a lot of things it could be. A good place to start would be pulling the throttle body and using tb cleaner and a toothbrush to clean it. May run a little rough for a little while afterwards while it is relearning. Give it a shot, and then start chasing vacuum issues. Quote Link to comment Share on other sites More sharing options...
Badbowtie247 Posted January 5, 2014 Author Report Share Posted January 5, 2014 Ok I know what your saying but I don't have any vacuum leaks at all and cleaned the TB and checked the sensor so maybe he just needs to adjust the TPS tables better in the tune. Quote Link to comment Share on other sites More sharing options...
Brentd Posted January 6, 2014 Report Share Posted January 6, 2014 Yep...if that doesnt work then you may have an issue with your brake booster Quote Link to comment Share on other sites More sharing options...
Badbowtie247 Posted January 7, 2014 Author Report Share Posted January 7, 2014 The fuel pump is stock, and I think the check valve is dying maybe bc it's stalling/cutting out at small revs..? Quote Link to comment Share on other sites More sharing options...
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