What the F is going here

94slowbra1

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Ok so I'm starting a new thread here to hopefully get some more help.
Back ground here, perfectly good running set up: gen 4 2.9, fore return system, all the standard bolt ons, tuned by 04sleeper. Tore down to do head studs, put it all back together with the same exact parts except the head studs, j2fab 270amp alt and new valve covers with the passenger side breather in the back.
I have since put it together twice. Checked all vac lines, port at the bottom of the intake is plugged, bypass seems to be operating, all plugs gapped and rechecked, all electrical connections checked, breathers, blower has oil, it seems to spin freely by hand, reloaded the tune just to make sure. If I left anything out just ask.
When i fire the car it wont start the first couple if trys and when it finally catches it sounds very sick. It will idle around 3-400, idle surges, the blower screams, I can hear a backfire every so often, smells of raw fuel, wont run without the blower belt, unplug the iac and it immediately dies, only shows 2lbs of vac.
I dont hear anything that sounds broken (metal, tapping ect...) I dont hear a vac leak (figure you would hear it for it to be causing this much trouble.
The only thing I haven't done is separate the blower from the intake and look at the rotors to see if the are contacting the housing. Not sure how this would just happen but.
So if anyone has any suggestions as to what to look for or ideas I'm all open.
I've done this a few times so I'm not new to it but I guess I could have missed something.
Here is a vid of what it sounds like
 

01yellercobra

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I just spoke with someone that had the exact same issue. His blower sounded the same. It was a huge vacuum leak. His was from the blower not sitting correctly due to the knock sensor bosses on the block not being ground down enough. He's running an aluminator block. Anyway, I would do a smoke test before tearing everything apart again.
 

94slowbra1

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I'll do the smoke test and see.
This is a factory block so I dont think I have that issue. I raised the intake gaskets but they looked ok. Maybe it's just not sitting correctly. I'll check and see. Hopefully it something like this and not hardware related
 

94slowbra1

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if i pull the maf plug the idle will smooth out but rise to 1400. and the blower will scream like its at full boost. still no vac reading on the gauge ( i have tested the gsuge with a vac pump and its reading right
 

Black02GT

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Replace the intake manifold gaskets? If so which did you use? Some of the Felpros are defective.
 

94slowbra1

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i havent yet, reused the ones that were in there, actual ford ones. i looked them over and they looked good but who knows maybe i missed something. im going to ford to get a new set, cant seem to find actual ford ones online, only felpro
 

First-on-race-day

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MG0h3

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I personally like using propane to look for vacuum leaks. We’d get a cylinder from Home Depot or wherever and it came with a valve and nozzle. Then we’d run some rubber fuel line off it and check diff areas.

After all of this work, I’d go over everything and ensure everything is plugged in correctly; injectors, coils, can position sensor etc.

The fact that you can unplug the maf and it smoothes out suggests it’s not mechanical to me; other than a possible vacuum leak.

I don’t have any experience with an inop bypass but the screaming blower sounds suspicious.

Limit run time since its running so rich.

I trust Kevin but I’d let him know and he’ll likely double check the start up tune


Sent from my iPhone using svtperformance.com
 

94slowbra1

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It might not have to do with the blower install. Might be a issue with the headstud install....

Sent from my SM-G950U1 using the svtperformance.com mobile app

While im not arguing with you I dont see how the studs could be an issue. This started immediately after the first start up, I'm mean the first second.dont see how that's enough time to mess up a head gasket.
I'm going to start with the top end stuff (vac lines, intake gaskets, blower ect..)then work my way down. A leak down will be in order if I get that far down
 

Black02GT

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Really? I've never had an issue, whats the problem with them?

Warped, lighter color rubber is the way to tell. I got mine in a full top end kit but when you line up the index clips (for lack of better vocab) the ports don't match right. Look em up on Summit couple bad reviews describe it. They also dont rep the Ford logo. MAHLE are the way to go now, still have the Ford logo and fit right.

Thought I was losing my mind till I searched.
 

cj428mach

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While im not arguing with you I dont see how the studs could be an issue. This started immediately after the first start up, I'm mean the first second.dont see how that's enough time to mess up a head gasket.
I'm going to start with the top end stuff (vac lines, intake gaskets, blower ect..)then work my way down. A leak down will be in order if I get that far down


Unplugging the MAF pretty much means you have a vacuum leak. Normally I'd suspect the rubber elbows on the mess that attaches to the pcv valve behind the blower, they can just go to complete chit, but since you deleted your pcv they shouldn't exist anymore.
 

94slowbra1

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Warped, lighter color rubber is the way to tell. I got mine in a full top end kit but when you line up the index clips (for lack of better vocab) the ports don't match right. Look em up on Summit couple bad reviews describe it. They also dont rep the Ford logo. MAHLE are the way to go now, still have the Ford logo and fit right.

Thought I was losing my mind till I searched.
I must have read the same reviews. I didnt know Mahle made a set. I'll look them up. Thanks
 
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94slowbra1

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figured id update this incase anyone else runs into this. long story short, I don't know exactly what the problem was. I checked every vac line individually and while some weren't perfect, they weren't bad, checked the boost bypass and it was fine. replaced the old intake gaskets a with new oem even though the old didn't look bad.
my guess is the old intake gasket was the culprit and the intake wasn't sealing up right. runs perfect now
 

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