i've searched around, haven't come up with much. i can post vids if noone knows what i'm talking about.

issue #1. when i'm in neutral and the car's warmed up, i go to press in the clutch before i take off. when i press the clutch in, the rpms surge down. while thats not a really a big deal it wasn't doing that until a few weeks ago. i dont think i did anything to cause this? the car has died maybe 3-4 times by just pressing in the clutch.

issue #2 also in neutral, if i 'tap' the gas pedal, theres kind of a delay between the time i hit the pedal and then it revs suddenly. also a new/ish issue.

are these idle air control valve problems?

i've cleaned my MAF and throttle body, neither helped these issues. recently bled my brakes (only the rears though so that might help the clutch issue) but it was doing that before the brakes.

 

There isn't an idle air valve on these cars, just the TB. I'd suggest swapping it with a known good one and seeing if it changes, sounds like it isn't working properly or sticking and since you said you cleaned it there isn't much else to do.

You didn't loosen the plate when you cleaned it did you?

 

So there's this guy. His name is, like, Sean or something. I think he might know these cars inside out and backwards. I feel you might have like, talked to him once or so. His phone, you should call it.

 

^^haha i bug him too much already

hmm... is there tuning required to just upgrade to the ls4 throttle body?

 

Yes, not tuning really but you have to reset the scalar value for the larger TB.

 

k thanks. and another thing gets added to my to do list...

any ideas on the clutch issue?

 

Does the scalar need to be adjusted at all when porting the TB. Specifically if only the inlet/outlet were ported and not the center portion where the real bottleneck restriction is?

 

i doubt it

 

No the scalar has to do with the throttle plate area, so it only should need changing if the throttle plate diameter is changed.

 

It sounds to me like a vacuum leak. When the clutch is released, load is also released from the engine. Then the engine delivers less fuel, in turn causing the engine to bog.

This wouldnt be an issue if the car wasnt already running lean. Since it is only delivering enough fuel for what it sees at the MAF sensor, the car won't be getting enough fuel if there is a vacuum leak.

Introduce a drop in fuel delivery to an already lean engine, and the engine will most likely bog or die. This drop wouldn't be enough for that to happen if the engine was getting the proper amount of fuel.

That is my theory anyways. It could also be in the tune if you have an aftermarket tune.

As far as the poor throttle response, they are all like that. They are able to tune it like that due to the drive by wire for comfort and emissions purposes. Pretty gay isn't it? Get an aftermarket tune if you want to fix it. I'm sure u also love how the rpms just hang there forever after you let off the gas too. Just be happy you have a supercharger and not a turbo, or the throttle response would be even worse without the possibility of tuning it out.

 

ok thanks for the input dude. i am tuned, huh never noticed the throttle response problem before... o well

 

Clean ur throttle body and get back to us.

 

you might want to check the endplay on the crankshaft

 

ok yea i still definately have these issues. recleadned my throttle body as good as i could. no difference in the crappy throttle response, but as suggested i'll see if i can get that tuned out. this is an issue for me because i like to downshift and having that delay really hiccups the process.

also i need to make sure i press in the clutch before i know the light turns green because if i just decide its time to go and i press in the clutch then the gas right after it bogs, then high revs and it makes me look like a ritard

will be swapping out my clutch this weekend hopefully, while i'm at it i'm gonna obviously add new fluids and bleed the brakes so maybe that'll stop the clutch issue. if nothing else i'll look into the vacuum leak suggestion but i don't think i have a vacuum leak for sure.