Chasing down an air leak........ could it be?

[anthonyj9h]

Originally Posted by garcmol

I know, I don't think the sensors are bad, I just think (maybe) that it's sending mixed signals causing the sputter and screwing with the timing. The brain thinks it's doing the right thing so it doesn't throw a code.

yeah a log of the timing would help but SOMEBODY!!!!! left their tuner at the shop so we wont know for awhile

[PQ]

Norm, if I take the brake booster hose off it sputters and dies like it should. It's the MAF sensor that I can take off with no difference.

[markssylver]

In a post a few pages back there was a picture of your engine with a breather filter were the oil cap goes
Could that be the leak I know when I had my. Car at ADM Andy told me my tune would need to be changed if I wanted to use one of those could that be your problem just throwing it out there

[garcmol]

Originally Posted by PQ

Norm, if I take the brake booster hose off it sputters and dies like it should. It's the MAF sensor that I can take off with no difference.

Ahhhhhh wonder if your speed density tuned. Now I've heard of this, but not exactly sure how it works. But I do think it takes the MAF out of the equation. Maybe thats why there's no change when its off. I hope you get it right Randy.

[GTAHVIT]

Originally Posted by garcmol

Ahhhhhh wonder if your speed density tuned. Now I've heard of this, but not exactly sure how it works. But I do think it takes the MAF out of the equation. Maybe thats why there's no change when its off. I hope you get it right Randy.

Well to clarify..

when he disconnects the MAF it idles the same but when he tries to rev the motor it hesitates... so I'm thinking the MAF is at least partially working correctly.

[garcmol]

Well, then it's working. Remember when the car would die after a couple of minutes due to the hose collapsing? Wonder if something similar is happening but in a different location. Just enough to make it sputter, maybe?

[Redemption]

Wait a second, disconnecting the MAF doesnt throw the CEL either? Thats not right, unless it was tuned out. But that leads me to believe there is more going on here than thought...

If the MAF is not right, then the computer is trying to compensate to make things happy. So then the fuel trims are all outta whack.

Got someone close by to swap one with real quick?

We'll find this SOB!

J

[GTAHVIT]

Originally Posted by Redemption

Wait a second, disconnecting the MAF doesnt throw the CEL either? Thats not right, unless it was tuned out. But that leads me to believe there is more going on here than thought...

If the MAF is not right, then the computer is trying to compensate to make things happy. So then the fuel trims are all outta whack.

Got someone close by to swap one with real quick?

We'll find this SOB!

J

I'm not so sure that it doesn't throw a code.... I don't remember Randy posting that it did or didn't???

[BackinBlackSS/RS]

I thought he said no codes.

[GTAHVIT]

Originally Posted by BackinBlackSS/RS

I thought he said no codes.

[Camarowguy]

Well I didn't have time to read the whole thread....but as a side note...I use wd40 instead of carb cleaner to find a vacuum leak. It's less flammable and doesn't dry stuff out like carb cleaner. Sorry if someone else posted this

[garcmol]

Originally Posted by BackinBlackSS/RS

I thought he said no codes.

He did. No codes. Very confusing. Randy, all your injectors seated and electrical connections on them tight? How much boost do you guys run with a Magnuson supercharger? Is it adjustable? Does boost stay steady or should it fluctuate as you drive? Does boost reflect on how much additional fuel is needed/used? I just ask cause if Mike at Vengeance said air leak, could it be on the fuel rail? Sort of sounds like your engine is starving at idle

[garcmol]

Since Chris was here it gave me an idear.....

Why is your intake tube capped right before the throttle body and Chris' isn't? Where does Chris' tube run and what do you have there in it's place?



According to this schematic, that capped off piece on your intake should have a hose running to the rocker cover. Looks like Chris is running a hose from there. Just wondering why yours wouldn't have that.

[PQ]

Originally Posted by anthonyj9h

yeah a log of the timing would help but SOMEBODY!!!!! left their tuner at the shop so we wont know for awhile

Originally Posted by markssylver

In a post a few pages back there was a picture of your engine with a breather filter were the oil cap goes
Could that be the leak I know when I had my. Car at ADM Andy told me my tune would need to be changed if I wanted to use one of those could that be your problem just throwing it out there

Not sure about that. Hope he didn't charge you. I've known plenty of guys who put one on and didn't have to. I actually was able to take the hose off and NOT plug the intake and it didn't change anytning. In fact, I sprayed starter fluid INTO the opening and it didn't do anything.

Originally Posted by garcmol

Ahhhhhh wonder if your speed density tuned. Now I've heard of this, but not exactly sure how it works. But I do think it takes the MAF out of the equation. Maybe thats why there's no change when its off. I hope you get it right Randy.

I have to assume Vengeance got it right.

Originally Posted by GTAHVIT

Well to clarify..

when he disconnects the MAF it idles the same but when he tries to rev the motor it hesitates... so I'm thinking the MAF is at least partially working correctly.

It hesitates at first. Then it revs just fine.

Originally Posted by garcmol

Well, then it's working. Remember when the car would die after a couple of minutes due to the hose collapsing? Wonder if something similar is happening but in a different location. Just enough to make it sputter, maybe?

It really never sputters. Just dies after a little throttle and brake at low rpms.

Originally Posted by Redemption

Wait a second, disconnecting the MAF doesnt throw the CEL either? Thats not right, unless it was tuned out. But that leads me to believe there is more going on here than thought...

If the MAF is not right, then the computer is trying to compensate to make things happy. So then the fuel trims are all outta whack.

Got someone close by to swap one with real quick?

We'll find this SOB!

J

I haven't seen a cel in months. And only when it's reved off the limiter.

Originally Posted by GTAHVIT

I'm not so sure that it doesn't throw a code.... I don't remember Randy posting that it did or didn't???

Nope. No codes.

Originally Posted by BackinBlackSS/RS

I thought he said no codes.

Originally Posted by GTAHVIT

Originally Posted by Camarowguy

Well I didn't have time to read the whole thread....but as a side note...I use wd40 instead of carb cleaner to find a vacuum leak. It's less flammable and doesn't dry stuff out like carb cleaner. Sorry if someone else posted this

I used starter fluid and propane.

Originally Posted by garcmol

He did. No codes. Very confusing. Randy, all your injectors seated and electrical connections on them tight? Yes. How much boost do you guys run with a Magnuson supercharger? Mine is 7.5 lbs. Is it adjustable? Only with a smaller pulley. Does boost stay steady or should it fluctuate as you drive? It goes up with higher RPMs. Does boost reflect on how much additional fuel is needed/used? Yes. I just ask cause if Mike at Vengeance said air leak, could it be on the fuel rail? Smoke test said no. Sort of sounds like your engine is starving at idle

I had to show the guy how to use the machine. Bad part is there were two other guys standing there as well.

Originally Posted by garcmol

Since Chris was here it gave me an idear.....

Why is your intake tube capped right before the throttle body and Chris' isn't? Where does Chris' tube run and what do you have there in it's place?



According to this schematic, that capped off piece on your intake should have a hose running to the rocker cover. Looks like Chris is running a hose from there. Just wondering why yours wouldn't have that.

I recently capped it. AFTER the F-Body Gathering. It's just a breather. Has no bearing.

I'm done for a while messing with it. I'm wore out with it. Spent 600.00 on a tune and got nothing. I've been to a number of shops and experts now and they seem to all be the same. I'm taking a break.

It's still fast.