Fixing ACIS...
- Thread starter Ma70.Ent
- Start date
Making sure that the parts inside of the intake aren't all gummed up from the egr and pcv systems. Both of those systems need to be in good operating condition as well. The PITA part of it is that its hard to get to the components under the intake.
Start by manually moving the linkage below the CSI. Then if that's good run a hose from a vacuum pump to the diaphragm (which moves the linkage) and check that it's responsive when vacuum is applied. Next test the VSV, this is covered in the TSRM. Those and vacuum leaks are the most common issues.
If anyone wants to flesh this out a bit better, have at it.
If anyone wants to flesh this out a bit better, have at it.
CRE is online! :runaway:
On topic:
After seeing my slightly gummed up upper intake, I'd second the "check intake cleanliness" suggestion.
I'll have to take before and after shots when I clean out my intake mani this winter break. I bet I'll have a black spot the size of small car on the driveway.
On topic:
After seeing my slightly gummed up upper intake, I'd second the "check intake cleanliness" suggestion.
I'll have to take before and after shots when I clean out my intake mani this winter break. I bet I'll have a black spot the size of small car on the driveway.
Cleaning may make it more effective, but generally, if the butterfly valve isn't moving the car saw 200,000+ miles, all driven by a granny, all in 3rd gear, while cruising at less than 30MPH (Yes, Sparky, we're referring to your car here :icon_razz ) or something else broke first. Moving parts become impaired as debris builds, but they don't stop moving from it... at least not from this kind of debris, now rocks... you got rocks blocking it, then, then you've got a problem (and probably a mad neighbor who would like to know where his prized rock collection keeps going late at night). 
I'm not saying not to clean it out... not by a long shot. Mine was filthy and so was SupraRX7Nutter's. It's definitely worth cleaning out, but if that's all there is that's keeping it from moving then you've got something else to look for (see: cracked diaphragm and cracked vacuum hoses) as it should have a lot more pressure moving it.
I'm not saying not to clean it out... not by a long shot. Mine was filthy and so was SupraRX7Nutter's. It's definitely worth cleaning out, but if that's all there is that's keeping it from moving then you've got something else to look for (see: cracked diaphragm and cracked vacuum hoses) as it should have a lot more pressure moving it.
IJ. said:
An EXCELLENT point. Rerouted vacuum lines are too common of a source of major grief... need to make sure VSV's are plumbed properly as well.
I've put a link in the N/A Upgrade FAQ to this topic.
Hopefully I'll figure out if mine works correctly or not. It probably does, but I'm paranoid and I HAVE to know
To add to the thread though, I assume I could just unplug the vac line then drive it and see if power is greatly noticeable at 4k+ rpm, then I'll know if it worked before or not.
Hopefully I'll figure out if mine works correctly or not. It probably does, but I'm paranoid and I HAVE to know
To add to the thread though, I assume I could just unplug the vac line then drive it and see if power is greatly noticeable at 4k+ rpm, then I'll know if it worked before or not.
On mine, I can actually feel and hear a difference once it kicks in.
If I'm flooring it in 2ng gear i can feel a little bump of energy right at ~4200 rpm. I can't feel it in first or 3rd, but almost always 2nd.
If I'm flooring it in 2ng gear i can feel a little bump of energy right at ~4200 rpm. I can't feel it in first or 3rd, but almost always 2nd.
Hmmm... I used to get that same thing in first and second. Found a thread over on SF on ACIS, so I went through the system, cleaned out the intake(the valve and linkage had sticky spots. I couldn't close the valve all the way by hand), checked all the vacuum lines. Now it pulls smoothly through every gear, and pulls well. If it isn't working correctly, I'd be very surprised.
My understanding of the system is that you only feel the 4000 rpm step when it's NOT functioning correctly, the transition is meant to be seamless.
IJ. said:
Hmmm..... well I'll be cleaning out my intake thoroughly sometime in the next few weeks, I'll update here if I notice anything.
Although I was pretty sure the valve abruptly opens and closes which leads me to think it would have a noticeable point of activation.
Ok, now i have a theory... I always seem to notice mine much more the first time I floor it beyond 4k. The subsequent pulls never seem to be quite as noticeable. Maybe it sticks or something the first time, after which it moves with more grace. :dunno:
I'm assuming that's what the Vacc reservoir is for to open at a set rate so you don't notice it snapping open....
ACIS lag? j/k
The coolant line for the ISC valve runs under there to. Could be heat from the coolant has slightly melted one of the vacuum lines under there if they where touching, either putting a pin hole in it, or maybe collapsing it. Just a thought.
The coolant line for the ISC valve runs under there to. Could be heat from the coolant has slightly melted one of the vacuum lines under there if they where touching, either putting a pin hole in it, or maybe collapsing it. Just a thought.
This thread popped up right in time. I'm looking for the part that's circled in black (disregard everything else). I've looked all over and found a few parts that look similar but don't have the nipples for the hoses. Does anyone have a picture of their engine showing where it's at? It'd help a lot with fixing my ACIS.
