Ok. First question. How does the computer control the wastegate solenoid? Does it simply close and allow pressure to build up in the wastegate until boost reaches the point you set with the actuator, and then open to bleed off pressure at lower boost? Or does it cycle in pulses. Question basically is, does it simply crack open and close, or does it pulse to give better control of the boost curve?
I used to have this slight rattling sound coming from my engine when it warmed up. Never could track it down. Totally sounds like a piece of tin rattling against something in pulses about 2 seconds long, but pretty erratic. Imagine if the torque converter cover was loose and rattling around pretty loud, but its not coming from there. Not a valvetrain knock or anything like that. I thought it was a loose heat deflector on a header, or the A/C clutch spring thing rattling around. But lately, this rattle has gotten really bad, and is worst when the engine is cold. When its warmed up, its practically gone. Ive taken a hose and listened all over the engine. Its usually easy to track a noise down and know what it is, especially from a guy working on hot rods for over 20 years who used to be an engine builder, but this one stumps me. It seems like the noise is most pronounced under the intake manifold...but sometimes sounds like the front of the motor. Hard to say with so many noises under the hood, but it definetely seems to be more under the intake than anywhere. What the hell is under the intake that could rattle like this? Maybe there is an oil deflector/pan thing rattling around or something? But why would the noise diminish when it warms up? Not sure what gasket is on there. The intake gaskets look paper thin, so I wouldnt think they used the stock pan. Ever had a noise like this? Is it possible to have a timing chain or chain/tensioner that sounds like this, and the noise is throwing itself to different parts of the motor? The motor allegedly had been rebuilt 4000 miles before I bought it, although it looked pretty crappy for a new motor, so who knows.
Final stupid question. Ive always had this crackling/fast popping sound from under my hood when I go WOT. Ive fixed all the exhaust leaks, and all the vacuum leaks. The tune is good. It sounds like the turbo is cutting the air up and throwing pulses through the intake tube (it sounds like that, even though "cutting it up" sounds ridiculous, I know). The intake tube does make alot of noise, being an aluminum piece. The car pulls hard and is not misfiring from what I can tell. Ive replaced the ignition module and everything you can think of.
Does this sound like a bad timing chain/gear problem? Like maybe my cam timing is really thrown off and the crackling is the combustion popping slightly into the intake? I dont get any intake backfires, even with alky spraying. It doesnt matter what I do to the tune. Its always there when getting deep into the throttle and always has been. The closer I get to WOT, the worse it is Ive pulled my valve covers off and checked play in all my rockers when the valves are closed. Ive cranked it and all the valves are opening. I wonder if I can get a good enough look at the chain by pulling the cam sensor out, and maybe stick a rod in there and check for chain slop.
Thanks in advance.
I used to have this slight rattling sound coming from my engine when it warmed up. Never could track it down. Totally sounds like a piece of tin rattling against something in pulses about 2 seconds long, but pretty erratic. Imagine if the torque converter cover was loose and rattling around pretty loud, but its not coming from there. Not a valvetrain knock or anything like that. I thought it was a loose heat deflector on a header, or the A/C clutch spring thing rattling around. But lately, this rattle has gotten really bad, and is worst when the engine is cold. When its warmed up, its practically gone. Ive taken a hose and listened all over the engine. Its usually easy to track a noise down and know what it is, especially from a guy working on hot rods for over 20 years who used to be an engine builder, but this one stumps me. It seems like the noise is most pronounced under the intake manifold...but sometimes sounds like the front of the motor. Hard to say with so many noises under the hood, but it definetely seems to be more under the intake than anywhere. What the hell is under the intake that could rattle like this? Maybe there is an oil deflector/pan thing rattling around or something? But why would the noise diminish when it warms up? Not sure what gasket is on there. The intake gaskets look paper thin, so I wouldnt think they used the stock pan. Ever had a noise like this? Is it possible to have a timing chain or chain/tensioner that sounds like this, and the noise is throwing itself to different parts of the motor? The motor allegedly had been rebuilt 4000 miles before I bought it, although it looked pretty crappy for a new motor, so who knows.
Final stupid question. Ive always had this crackling/fast popping sound from under my hood when I go WOT. Ive fixed all the exhaust leaks, and all the vacuum leaks. The tune is good. It sounds like the turbo is cutting the air up and throwing pulses through the intake tube (it sounds like that, even though "cutting it up" sounds ridiculous, I know). The intake tube does make alot of noise, being an aluminum piece. The car pulls hard and is not misfiring from what I can tell. Ive replaced the ignition module and everything you can think of.
Does this sound like a bad timing chain/gear problem? Like maybe my cam timing is really thrown off and the crackling is the combustion popping slightly into the intake? I dont get any intake backfires, even with alky spraying. It doesnt matter what I do to the tune. Its always there when getting deep into the throttle and always has been. The closer I get to WOT, the worse it is Ive pulled my valve covers off and checked play in all my rockers when the valves are closed. Ive cranked it and all the valves are opening. I wonder if I can get a good enough look at the chain by pulling the cam sensor out, and maybe stick a rod in there and check for chain slop.
Thanks in advance.