its normal for the gauge to do that when u let off...should go lower numbers when u are on it, then when u let off will for a split second go way up

 

Here is how my idle. Sometimes more rough than that, sometimes doesn't.

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^^ya, something wrong there. And you are sure you dont any vacuum leaks?

 

I don't really think so.... It started happen when it was really hot ( couple weeks ago when i got to TX) So at that time i thought it was just too hot. And not long ago, i did boost leak test and all the vacuum leak check at local shop when i went to go test my boost gauge. No issue at that time. And...humm... when i fixed A/C line...all i can think about is intake hose was little bust ( but not bad at all ) And i had to move the pipe behind the blower at that time, but i did check the couplers couple days ago ( when i played with BPV )
looks all good to me...It's getting worst and worst..i gotta find a way to fix this...

 

wow are you sure that wasnt my car!? that is exactly what is going on with mine! looks like we have the same problem.. mine wont start doing it until the car is fully warmed up after driving a few min. on a cold start it is fine, the other odd thing is when the a/c is on it doesnt seem to do it either.. have you tried turning the a/c on to see if yours does?

 

+1 that's not normal and it should not happen even if it's hot or cold.

U might want to redo your vacuum lines and zip tie each end to be sure there's no leaks. Also u should check to see if the plenum is tight or if the oil cap seal isn't caught in between the spacers.

 

Sometimes good sometimes more worst even with a/c on or not. Hal ( who tuned my car ) is trying to working with me but too far away and we didn't have a time to really sit and fix this thing out... We'll see tho. I'm kinda understanding why this is happening tho. I just need to log on to utec...god damm this connect thing not helping me..

 

Back when I first installed my procharger I had the exact idle problem like ur vid chef. Charles at automotion thought I had cams. We tuned it, idle was still going up and down. He thought it was a vaccum leak causing it. But after a few weeks of driving it just went away. Has only done that a few times since. Even after haltech install and tune. One afternoon the idle started to jump up and down I was like damn not this again but the next day it was fine and has been fine. The only thing I can think it could be im probably wrong. But i think Having a fuel return would help with this problem. Because u can set ur pressure at idle and it stays constant at idle. Thats just a thought.

 

I have the same problem. mine goes up and down too.. wtf. also when I rev the car.. and the revs go down it like stops for a 1 sec and then goes back down. is that normal?

 

none of that is normal. Its should idle just like stock. there is no reason why your non-return fuel pressure wouldnt stay absolutely steady at idle, unless you had a really bad voltage problem causing the pump to surge.

 

That may be true. My fuel pump since day 1 of install.You can here it change tones sometimes. Really weird. It probably is a power surge in my case.

 

my walbro is pretty loud compared to stock

 

The Stock ECU is trying to Control AFR @ Idle, But if the the Values in the SS Box too HI or too Low ( out of range that the O2 sensors can Read) then the Stock Ecu will be Trying to correct and you will have an erratic Idle. But you Must Verify that everything is installed correctly.

 

RPM stop for a sec? i have no idea man, sounds not good. What injector did you install?

 

utec and DW 600cc ^

 

Yea, i do hear some members running haltech and have rough idle too. I'm assuming that it's something to do with fuel timming.

 

That's wwhat i'im running too. But i don't know why yours stop for second. Did you ask tuner about that? i'm guess need little adjust on utec.

 

Idle is good with Haltech. I was refering when I was using the utec. It seemed to happen a lot more. That was with the procharger kit and the TN kit both kits still had idle jumping around. Procharger seemed worse then TN kit. So far everything has been good since I switched EMS. And raised idle.

 

my car idles fine with 600cc injectors with no UTEC. Your trim values would have to soo out of whack it would be very obvious on your AF gauge.

When I started making a NA map, I had my 0% column too lean and the idle was all over, but it was also a 17-18 AFR. anything close to 15 and you can rule out the 0% column trims.

 

I gotta hook up my aem wideband. My afr on WOT in dyno was around 11.2. What should the afr at idle be? 14-15?