Car Runs Good In Open Loop
- Thread starter Exile918
- Start date
ty. Ive recently replaced spark plugs fuel filter, cleaned maf sensor and TB. Car has 90k miles. Any thoughts???
Dino Dino Bambino
15 Year Member
My car is bone stock by the way and i want to go cai and tune but whats holding me back is this. I really want the car atleast to be running properly before i get into the tune deal. Sometines i wonder if it is just the stock tune itself but i dont understand how the car runs good in the beginning of a drive then progressively gets sluggish. Sometimes it runs good sometimes it sucks. Makes no sense!!
SpartaPerformance
10 Year Member
Well in open loop the ECU uses predetermined values to calculate air intake, fuel and throttle position. When in closed loop then it uses sensors, so if this is the case as you're describing it one of those sensors may be on its way out. The most common failure with no fault codes I've encountered is TB starting to take a poop. GT-500 unit new is pretty price friendly, comes with new electronics, all you need after that is spacer and 4 longer bolts and you're good.
About a month ago someone suggested that maybe the tps sensor was prob going bad so i found a new motorcraft for like 30 bucks and gave it a shot. I thought maybe even the TB might be failing so i figure do the cheap part first. The car felt great for like 7 days i mean it just felt proper and i was really enjoying. It def felt like it fix the problem but then again it might be that i had reset the compture when i disconnected the ground cable and maybe i was feeling that effect.. So its the tps your talking about or its another sensor that the TB might have??
SpartaPerformance
10 Year Member
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