Intermittent Miss While Boosting
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Intermittent Miss While Boosting
I'm somewhat new to the rx7 scene,but I've got a 1990 with an s5 t11 swap.The car runs great some of the time.But when its cold it has an extreme hesitation only under boost,its all stock,I've checked tps,engine and body grounds,visual for vac. lines,It seems like its starving for fuel,but if I run it for 10-15 min then let it sit for awhile(20 min),it runs really strong boosting perfectly.Any help is greatly appriciated.Thanx Chad
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I'm only running stock boost,therefore I have no fcd.When you say let it warm up are we talking 20min of driving?Even when it comes up to operating temp it still has a huge 'hesitation',unless I park it for 15-30 min,then get back in.(it seems if the temp gauge is up at all when I fire it up it runs great,)I'm thinking faulty coolant temp or something like that.Not sure if anyone has experinced this or not.Thanx for the help.Chad
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I've got a k&n filter with stock exhaust,(but I punched out the converters last year).I'm running a stock boost gauge for now but I have purchased a new one I just haven't installed it yet.So what is my next step?fcd?ported wastegate?Thanx Chad
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An FCD without fuel mods will just let you overboost the engine and blow it, so don't worry about that part unless you want to start getting more power out of it. The FCDs also prevent the ECU from retarding timing under boost, which can lead to detonation as well. An rtek chip (www.pocketlogger.com) would be a much better route, since it doesn't alter the boost sensor signal.
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Thanx for the reply Rocket,where you I find a good set of instructions on porting a s5?I know there are alot of threads on it but not all info found on the web is 100% accurate.Thanx Chad(by the way does it make any sense to you that this doesn't occur when the car is warm?)
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Thanx for the reply Rocket,where you I find a good set of instructions on porting a s5?I know there are alot of threads on it but not all info found on the web is 100% accurate.Thanx Chad(by the way does it make any sense to you that this doesn't occur when the car is warm?)
Not sure why it would be different if the engine is warm or cold, but you definitely should not be boosting until the engine reaches full operating temp anyhow. However, ambient air temps can affect boost creep too. You'll be more likely to encounter it on a cold night, than on a hot day.
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