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Bare with while I attempt to explain this...
This isn't something that happens all the time, but sometimes when I start my car for the first time during the day (happens during both cold and warm weather), I'll be accelerating and power will come in surges, rather than smooth.
Since the car is still warming up, I keep it below about 2,700 rpm and don't go into boost. The engine will sort of accelerate, sort of jerk a bit, then accelerate, then jerk again. It will do this for maybe 2 or 3 minutes. It's not a violent surging or jerking, but rather a smooth "power, no power, power, no power" feeling. It doesn't stop accelerating, but the engine feels briefly down on power, then fine, then down on power, then fine, etc.
What I found VERY strange, is that the engine finds boost VERY easily. Like, when it's not experiencing this problem, the engine will only go into boost if I make it, and will always have quite a bit of vacuum on both the stock gauge and my boost gauge, unless I get on the pedal. When it's doing this surging power on/off thing, I can hear the turbo spooling away and sucking through the filter quite a bit, and letting off the gas gives me the full on PSSSSSh of the stock blow off valve, the same as if I'm spinning along at 12psi. even with like, 5% throttle application... If I dont have a VERY gentle touch on the pedal, it goes into boost very, very easily. It only does this when it's doing the power surging thing, and it only does the power surging every so often. Say once out of every... 6 cold starts?
After a few minutes of this, once it starts registering on the stock temp gauge, the surging goes away, and it goes back to staying in vacuum unless I really put my foot down.
What the hell could possibly cause so much boost to be made with such little throttle? What could possibly cause this smooth power/nopower/power/no power feeling? Like I said, it's gentle, though you can easily feel it, even without focusing on it.
I checked for vacuum leaks the other day and found the hose that goes from the hardline from the charcoal canister to the intake manifold (i think) was completely split, so i replaced it and the idle is much smoother now. That was all I was able to find. I still have the stock pipe between the turbo and maf/airfilter, could that be split somewhere, causing this problem?
So yeah, I think I explained that the best I possibly could :X
edit: The engine is also down on power in general. If that helps at all, lol.
another edit: The engine makes boost really easily, which despite the fact that its surging in and out, makes it feel like it has more power. Even at just light throttle. Placebo effect, or is my engine just stupid?
This isn't something that happens all the time, but sometimes when I start my car for the first time during the day (happens during both cold and warm weather), I'll be accelerating and power will come in surges, rather than smooth.
Since the car is still warming up, I keep it below about 2,700 rpm and don't go into boost. The engine will sort of accelerate, sort of jerk a bit, then accelerate, then jerk again. It will do this for maybe 2 or 3 minutes. It's not a violent surging or jerking, but rather a smooth "power, no power, power, no power" feeling. It doesn't stop accelerating, but the engine feels briefly down on power, then fine, then down on power, then fine, etc.
What I found VERY strange, is that the engine finds boost VERY easily. Like, when it's not experiencing this problem, the engine will only go into boost if I make it, and will always have quite a bit of vacuum on both the stock gauge and my boost gauge, unless I get on the pedal. When it's doing this surging power on/off thing, I can hear the turbo spooling away and sucking through the filter quite a bit, and letting off the gas gives me the full on PSSSSSh of the stock blow off valve, the same as if I'm spinning along at 12psi. even with like, 5% throttle application... If I dont have a VERY gentle touch on the pedal, it goes into boost very, very easily. It only does this when it's doing the power surging thing, and it only does the power surging every so often. Say once out of every... 6 cold starts?
After a few minutes of this, once it starts registering on the stock temp gauge, the surging goes away, and it goes back to staying in vacuum unless I really put my foot down.
What the hell could possibly cause so much boost to be made with such little throttle? What could possibly cause this smooth power/nopower/power/no power feeling? Like I said, it's gentle, though you can easily feel it, even without focusing on it.
I checked for vacuum leaks the other day and found the hose that goes from the hardline from the charcoal canister to the intake manifold (i think) was completely split, so i replaced it and the idle is much smoother now. That was all I was able to find. I still have the stock pipe between the turbo and maf/airfilter, could that be split somewhere, causing this problem?
So yeah, I think I explained that the best I possibly could :X
edit: The engine is also down on power in general. If that helps at all, lol.
another edit: The engine makes boost really easily, which despite the fact that its surging in and out, makes it feel like it has more power. Even at just light throttle. Placebo effect, or is my engine just stupid?
There's those two ECU's in the trunk... Don't really know what one of them does, though :X
) where the car would begin surging like crazy at WOT, but would accelerate fine, and pretty quickly, at about 75-80% throttle. Above that, surging, like it wasn't getting enough fuel. It doesn't do this in first or second gear (i didnt try it in third), perhaps because there's more load in the higher gears. I'm going to finally do my fuel filter, as well as try the grounded fuel pump mod temporarily to see if that fixes it. It hasn't realy occured to me that I have stock injectors and most likely a stock pump too, and I'm running 12psi (no controller, just gets up to 12 with my breathing mods).
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