95 mustang 3.8L V6 engine knocking - Mustang Evolution

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Old 01-15-2011, 01:56 PM   #1
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95 mustang 3.8L V6 engine knocking

engine has knock at idle until i put 3 lbs. of external vacuum to egr valve. have replaced egr valve and egr regulator. Any recommendations on how to solve this problem? Your help would be greatly appreciated.
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Old 01-15-2011, 08:07 PM   #2
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Re: 95 mustang 3.8L V6 engine knocking

do you have a cold air intake? if so check to make sure its in there tight, mine wasnt and use to m ake a knock when i was idlle
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Old 01-16-2011, 03:12 AM   #3
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Re: 95 mustang 3.8L V6 engine knocking

You have got me on this one. Never heard of a knock going away when you open the egr valve. Unless it knocks at idle speed and when you put vacuum to the egr it idles the motor down and thats what causes the motor to stop knocking. I'll try to do some research and figure it out for you.
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Old 01-21-2011, 03:20 PM   #4
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Re: 95 mustang 3.8L V6 engine knocking - PLEASE HELP

95 3.8L V6 mustang does knock at idle. when applying 3 lbs. vacuum to egr valve it idles the motor down and the knocking stops. We have replaced the egr valve and egr air solenoid. We discovered that the cam sensor was 180 degrees out, corrected that but still continues to knock at idle. We have checked the pistons, lifters, rocker arms, injectors. We have listened with the stethescope and knocking sound can be heard at the intake air box as well as the egr valve which makes it very difficult to pinpoint the exact location of the source of the knocking sound.
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