Ok.... car surging and dying again......

[PQ]

Originally Posted by SS King

Yes on knock sensor is right above the oil cooler and the other is on the other side in the same location

I'll check it out.

[PQ]

Also, the tach needle bounces more than I'd like but might be normal. When it is acting up though it bounces pretty good.

[SUX2BU]

You check the MAF? Sounds like dirty or faulty MAF.

[Chavira2009]

I noticed the same thing with the SS I looked at. The tach would bounce around all over the place. I pulled these pictures. Hope they help.

[PQ]

Originally Posted by SUX2BU

You check the MAF? Sounds like dirty or faulty MAF.

I haven't had it checked. It was good before Vengeance. I had actually swapped MAFs with another Camaro. LOL

It still did the same thing.

I'll try it again though. Might have to wait for the fest though.

[PQ]

Originally Posted by Chavira2009

I noticed the same thing with the SS I looked at. The tach would bounce around all over the place. I pulled these pictures. Hope they help.

Yup. They help.

I've been down there. I know right where they are.

Ya, my tach only bounces 200 rpms at it's worst. But still shouldn't do that. Even cammed I'd assume.

[Chavira2009]

I bet when it drops down to 200 rpm you have to give it gas, and if you don't it dies?

[PQ]

Originally Posted by Chavira2009

I bet when it drops down to 200 rpm you have to give it gas, and if you don't it dies?

Well, it is cammed so really if it drops below 500 at all. And that's when it surges to try and recover if it can.

[Chavira2009]

I have mine cammed too and it has dropped low rpms maybe once or twice that i can remember where I did have to give it gas to keep it from dying. I don't know if it would have to due much with the tune, but all is possible.

[PQ]

Originally Posted by Chavira2009

I have mine cammed too and it has dropped low rpms maybe once or twice that i can remember where I did have to give it gas to keep it from dying. I don't know if it would have to due much with the tune, but all is possible.

Have you ever been backing up say on an incline and had the car almost die but recover too much and surge and then come back down and almost die and do that till you stopped it?

That's what it will do. I don't mind having to give a a bit of gas but it sucks when it dies in front of everyone. And then it takes a second to start.

[fldrummer]

Originally Posted by Higgs Boson

any time you change the tb size or way air flows into the engine you should retune the idle. a cam drastically alters this. a tb alters this, even a ported one. most people rely on trims to try and compensate but it doesn't always work under all conditions.

^This. Do you have a ported throttle body? I had similar problems after getting cammed and dyno-tuned. It may need the idle raised slightly and/or more air, if I recall (I'm not a tuner though; I believe that's what was done to fix my issue).

[Chavira2009]

I've had it almost die and give it gas, but not bounce up and down like you said. Seems like a tricky situation.

[PQ]

Originally Posted by fldrummer

^This. Do you have a ported throttle body? I had similar problems after getting cammed and dyno-tuned. It may need the idle raised slightly and/or more air, if I recall (I'm not a tuner though; I believe that's what was done to fix my issue).

NO ported TB. Same CAI as I had when I installed the blower and it was tuned by Vengeance with this intake.

Might just be the idle. But is it normal for it to idle perfect for a while and then idle much lower for a reason? Then idle back up later?

Originally Posted by Chavira2009

I've had it almost die and give it gas, but not bounce up and down like you said. Seems like a tricky situation.

[Higgs Boson]

Originally Posted by fldrummer

^This. Do you have a ported throttle body? I had similar problems after getting cammed and dyno-tuned. It may need the idle raised slightly and/or more air, if I recall (I'm not a tuner though; I believe that's what was done to fix my issue).

right. more means base running airflow or also called idle air. basically how much the tb opens to maintain idle with no driver input.

if the idle is bouncing then your idle spark is wrong or your running airflow is wrong or both. the idle corrections are trying to get it back to idle target rpm but can't keep it there.

yes it can seem worse sometimes than other times.

it only happens under certain circumstances because lots of things affect your fueling and spark like ect, iat, etc etc.
if it dies coming from a roll or the dropping rpms don't catch idle then there are a few other criteria to address as well.