bodyrocka03

Ok, so i decided to replace all spark plugs and ingnition coils on my 07 Max. Of course the intake manifold had to come out. I used this guide to help me along the way.. http://my6thgen.org/f107/how-replace...ark-plugs-267/ After reinstalling everything I am hearing what I think is a intake leak, with at times a small high pitch whisteling sound. I used a a new Felpro intake gasket so I wouldnt think that would be it but who knows. Is there a good way of detecting/determining whether there is in fact a leak? I'm pretty sure all vacuum lines and such are installed propperly. I double and tripple checked it before firng it up. Also, I now hear a loud whoosh or sucking sound when turning on th A/C, any ideas? I will get back under the hood tommorow and see if I can spot anything unusual. Any help would be great!

MAXMEL44

@bodyrocka03 I'm having the same issue. I replaced the plugs this past summer. And ever since then I get the same sound upon acceleration. I also have an 07 with 100k.

MAXMEL44

@bodyrocka03 I'm having the same issue. I replaced the plugs this past summer. And ever since then I get the same sound upon acceleration. I also have an 07 with 100k.

MAXMEL44

I too am having the same problem. I changed the plugs on my 07 with 100k and ever since then I get the same sound upon acceleration. No sound on light throttle but when I give it a lil bit more gas you can hear it. Hope I can figure it out. It's annoying.

Terrentius

I am hoping all of you (1) followed the torque procedure/sequence and (2) installed a new gasket when doing this job. Lacking to do either will results in an improper seal, which will result in an intake leak. If I were you, and there was no leak before your work, then I would disassemble, clean, install new gasket, then reassemble as per the procedure in the factory service manual.

Kryogen

did you follow the torque sequence with a torque wrench? If not buy a new seal and start over.

I personally re-used the old seal because the dealership ordered the wrong gasket for me, and it looked perfectly fine. I followed the torque specs, and it's been all good for more than a year now.

CRiME

iTrader: (21)

I re used the old plenum gasket as well, no leaks for over 2 years now.

Sometimes you can find a leak by spraying TB cleaner or something of the like in the general area of the intake manifold. If you find that hitting a particular spot causes a change in idle, you can check that area for your leak.

bodyrocka03

Yes I did use the proper torque values and sequence. I also used a new felpro gasket. It just sounds like there is a leak still. I tried spraying carb cleaner but it get nothing. I am on the verge of tearing it apart again and re-installing. When doing that I am considering using the NWP phenolic spacers. Any experience with those?

twentyeggs

Yup I have those, those naturally have a whistle but it sounds more like a brief clip of a turbo spooling. Like, the sound doesn't increase in wave frequency, as a turbo spins faster, just that type of sound. kinda hard to explain.
as for your intake leak, my best guess is you have a faulty gasket, or didn't follow the sequence. the reason the sequence is important is because as you tighten one side metal will bind on the other. If you don't torque down evenly you will bind and create an uneven spot manipulating and ruining the gasket, and later when the metal starts to settle some of the bolts become loose, and depending on the application the bolts could cause a failure. This is especially true with installing rims. You can tighten all you want, but if you don't use the star pattern your rims will settle to get out of the bind, your bolts will become loose in as little time as a drive to the store, and when you take a hard turn or hard break, your rim can actually sheer off the studs and bye bye rim, hello body work. But you said you did the sequence. All that lecture was for the forum lurkers who may not have known.

Best thing to do is, reinstall, sometimes that is all you can do.

chrome91

iTrader: (1)

spray brake cleaner around the intake, when you hear the idle jump, you know where the leak is

whenever you remove the intake, replace the gasket as well

hariaum

I'm about to tackle this job myself, thanks for the tips.

I just hit 108k miles and need to hurry up and get this done. How is the waterpump on these cars? Does it need to be changed at 100k like all the german engineered cabooses?