Hello, I recently tuned my 2006 SS/SC. I tuned the car 2 weeks ago and it was running amazing, besides the clutch starting to fade. Well a few days ago the car started running like crap. VERY VERY lean. if i go passed half throttle the car bogs and back fires. And today the car pretty much didnt want to run. I tried changing the MAF and MAP sensor and nothing changed. I am going to try to change the fuel filter, in the hopes it is clogged. The only thing i changed besides the tune is the spark plugs, cat removal, and i used fuel injector cleaner.

Car mods are 3" pulley, exhaust and injen CAI. I am running NGK temp 7 iridium plugs. Gap is ~31

Its weird cause the car ran great before and after the tune. Then 2 weeks later, it doesnt. If anyone has had a similar problem LMK.

Thanks

 

whats the afr

 

Check your fuel rail pressure.

 

My fuel trims are at 20+% both LT and ST

Gonna have to check if i have a gauge for that

 

what was your coolant temp? I know when mine first starts up and I go to take of it dips lean when I give it gas if I don't warm it up.

 

My coolant temps are normal. My car is lean all the time. Cold, warm, now it barely runs and starts. All the plugs are white. Tryna figure out what could have gone wrong two weeks after the tune.

 

richen it up

 

If the car was running good before, and after the tune for 2 weeks I would say it's more mechanical. Tuning a car with a mechanical problem doesnt fix the problem.

 

i wouldent say that mine went super rich after i had it tuned and there was nothing wrong with the car mechanicaly what so ever no vac leaks and it did great on a leak down check the only thing that changed was the weather

 

You're going to run leaner in cold weather, if you were tuned in warm weather and vice versa. I've already switched over to my winter tune, since I've been drag racing at night in 50 degree temps and don't want to go boom.

 

I checked the fuel pressure at the rail and its 22psi. Now i have to figure out if its the regulator or the pump.

 

check it before the filter if u can

 

I haven't seen too many regulators go bad that way. I'd suspect pump.

 

You melted your cat

 

There is no cat.

 

If ure car runs great for two weeks and all of a sudden like ****. Then either there was a drastic elevation change or temp change. Or mechanically wise a bad 02 a intake leak after the maf which is more reasonablw

Lol fuel rail pressure should be 45-60

 

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