Anyone having idle issues with after putting a Boss 302 intake manifold on a base 5.0 GT (see signature for configuration). I have a fluctuating rpm issue at idle that goes as low as 500 rpm and then spikes back over 1000 rpm. Sometimes the engine kills and I have a challenge getting it restarted (but one it does, then, no more issue for a while. Bama is helping me with diagnosing, but, wondering if any of y'all have had this issue.

 

who did the Tune for the car?

 

BamaTunes - using 87 Performance now. I had them before the Boss302 and in my '05 w/o any issue at all. I sent them a bunch of diagnostic info and they are being EXTREMELY helpful. Just wondering if anybody else had this issue too. I had some fitment issues with the intake and I am wondering if I am getting like a back flow issue? I do indeed notice the power difference, so, I did something right ... maybe ...

 

Check the gaskets and seating on the intake manifold. This sounds like a vacuum leak.

Get a can of carb cleaner and with the engine running spray small amounts around the intake ports. I'd you notice an Tom rise or spike, you found your leak.

 

We tackled this a long time ago and solved it in the tune. IF there are no vacuum leaks it is a tune related issue. Are you still using the Steeda CAI on your signature? If so we can help.

PM me if you are interested.

 

^
so that's why everybody loves Steeda.

 

That's odd, my car idles perfect but I didn't notice much power up top. Sure noticed the torque loss though.

 

I've had the opposite reaction. The extended powerband is incredible, and the loss of torque isn't anything I'm feeling.

 

Does your car have cats still? The only exhaust mod I have done is GT500 axlebacks, I think my stock exhaust is choking it.

To me I can for sure feel the loss of torque from 3-5k, but above that it just feel like it revs longer, not really pulls harder.

 

William, i'm not seeing that mod in your signature... are you hidding stuff from us !!!Just sayin'

 

 

Mine has the cats, exhaust is just the 3" magnaflow competition catback. The stock H pipe still sits in there, then just a JLT CAI and BBR tune running on the car.

 

I wonder if its in my tune then, I would think the Bama tune would be safe but probably still make good power. At this point I would call the intake a waste of money, I hope my mind gets changed...

 

We've made good power with Boss intakes, cold air, and stock exhaust on these cars. Exhaust does help, but should not be in the way of making good power otherwise....

 

What kinda power? Have you gotten the torque remotely close to what it was before the boss manifold? I know the vct can be tuned to minimize those losses down low, I wonder if my tune has had that much time put in...

If I wasn't sold a Steeda shifter that didn't fit and then had the guy on the phone tell me to grind the tab down as the solution, I would be inclined to talk to you guys about a tune. I wouldn't want you guys to tell me to fix the tune myself if it didn't work! LOL

 

Who did you speak to that told you to grind something down? PM that to me if you could. My guys are instructed not to tell anyone to grind anything on any of our parts for fitment unless the instructions say it specifically requires modification (an example would be the competition upper 3rd link where you have to bend the gas tank tab slightly to clear the larger chassis mount.) So I would like to know who is telling customers such things.

There should be no reason to grind anything with that shifter. Only thing that could cause an interference is the reverse lockout tab which our instructions say to adjust the shifter for clearance. The shifter base holes are slightly oversized to allow a small amount of left to right movement for positioning before you tighten it down.

Now the clearance allowed is tight so if there was not enough range of movement to get yours to clear then this would be the only one mentioned to us so far. Certainly not impossible that is what happened so it is not common. I do apologize if you were the unfortunately victim of that.

I am more than willing to give you a free tune just to try out, if you dont like it, it cost you nothing and you still have your other tune. If you do a search on these forums you will find we have a pretty good track record when it comes to tuning, and many other things. We are not perfect, but it certainly would not hurt to give it a try if you want. No risk involved.

 

Forgot to answer your "what kind of power" question. Here is a dyno sheet for a car with stock exhaust. This was on a cooler day, on a day like we see in summer here you can expect 6 to 10hp less on the same dyno (our dyno). You numbers will vary based on the type of dyno obviously, they all read different.

 

Are those two runs showing the back to back of the with and without boss manifold? You guys got the torque that close, and still picked up all that power?? Thats the kind of torque loss I was hoping for, not what I am feeling.

I will for sure take you up on that free tune offer (an amazing gesture btw), I will call the number in your signature to discuss the thing about grinding the tab down.

 

check the injectors and be sure you didn't loose an o-ring around one. my buddy had that exact issue, we pulled the **** thing off to check for a leaking gasket and everything, turned out when we pulled the injectors out of the stock intake one of the o-rings stayed behind. new o-ring and it was fine.

 

HOLY CRAP! Steeda FTW!! I will quit hijacking this thread and make my own lol.