Low boost and blow-off sound
10-25-2006, 08:53 PM
#1
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Low boost and blow-off sound
I did a search but didn't see anything with these specific symptoms. The problem is as follows:
When accelerating my boost climbs to 1/2 halfway past the "1" on the boost guage and then stays there and I can hear air rushing out of the system. When I let off the throttle it makes a sound just like a BOV that's pretty loud. I checked all the vacuum lines on top the engine as well as the connections in and out of the intercooler but didn't see anything loose or torn. I'm thinking it may be the DV or the wastegate. Just looking for a little advice. TIA.
When accelerating my boost climbs to 1/2 halfway past the "1" on the boost guage and then stays there and I can hear air rushing out of the system. When I let off the throttle it makes a sound just like a BOV that's pretty loud. I checked all the vacuum lines on top the engine as well as the connections in and out of the intercooler but didn't see anything loose or torn. I'm thinking it may be the DV or the wastegate. Just looking for a little advice. TIA.
10-25-2006, 08:58 PM
#2
Cast Iron Man
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Sounds like you are on the right track. Make sure you check all around the underside of the intercooler fittings. You could also have a leak at the j-boot.
10-25-2006, 09:11 PM
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We're gonna check from underneath tomorrow. Is the J-Boot the one that goes from the intercooler into the MAF/TB assembly?
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10-25-2006, 11:33 PM
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of course it could be the wg. If the wg is opening too early, you can hear the air form the bypass exiting the wg to the exhaust.
...if I turn my boost control all the way down, boost will hit right at 5psi and stop dead, and you'll hear the wg letting air by.
...if I turn my boost control all the way down, boost will hit right at 5psi and stop dead, and you'll hear the wg letting air by.
10-26-2006, 09:26 PM
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Originally Posted by reno808
Mine had that same exact symptoms as you and it was the torn intercooler cupling. check it agian. some times they are hard to spot.
10-26-2006, 09:27 PM
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Originally Posted by Chas
of course it could be the wg. If the wg is opening too early, you can hear the air form the bypass exiting the wg to the exhaust.
...if I turn my boost control all the way down, boost will hit right at 5psi and stop dead, and you'll hear the wg letting air by.
...if I turn my boost control all the way down, boost will hit right at 5psi and stop dead, and you'll hear the wg letting air by.
If it was me with this problem (you have a HUGE vacuum/intake leak), I would go down to home depot, buy a PVC closed end pipe fitting, and install a bicycle tire needle in it. Get the one that fits perfectly into the intercooler inlet rubber fitting and then pressurize the system a little. With a leak the size of yours, you'll be able to find them all pretty easy.
10-28-2006, 04:59 PM
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I found the problem this a.m. The diaphragm inside the diverter valve was torn. Replaced it and she was good to go. Thanks all for the help.
