3G V6 Eclipse: Vacuum leak sound and hesitation @ 4200rpm
Aug 28, 2004, 10:37 AM
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3G V6 Eclipse: Vacuum leak sound and hesitation @ 4200rpm
Doesn't happen in neutral free-revving (did it once or twice without an issue).
Doesn't happen if you gradually accelerate.
Does occur with more than 60% of the throttle applied. There's immediate hesitation when you reach 4200rpm and a very distinctive vacuum sound. Sort of sounds like a VTA BOV with a stuck open valve.
Engine has never been modified (the 3G Eclipse just can't be helped, heh), so I'm guessing a hose leak. It'll be 2 1/2 hours before it cools down enough to get under the hood, so just curious as to what folks think might be the loose culprit.
Doesn't happen if you gradually accelerate.
Does occur with more than 60% of the throttle applied. There's immediate hesitation when you reach 4200rpm and a very distinctive vacuum sound. Sort of sounds like a VTA BOV with a stuck open valve.
Engine has never been modified (the 3G Eclipse just can't be helped, heh), so I'm guessing a hose leak. It'll be 2 1/2 hours before it cools down enough to get under the hood, so just curious as to what folks think might be the loose culprit.
Aug 28, 2004, 11:45 AM
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Well, think I found it.
After checking all the hoses and hose clamps, and finding nothing wrong, I had to start digging around. Well, didn't take me more than a minute to look at the front-intake to notice the impressions that two washers would have made when tightened down. No screws were there. Sure enough, I could move the intake ram around fairly easily, lifting it up a good 3 inches.
I lowered the hood to see where it would make a seal against the foam. Using some piano wire, I tried lifting the intake ram, and sure enough I can.
So there's our culprit. Loose front intake. Dealer did my last oil/filter change, so I'll have them install those bolts on their dime.
After checking all the hoses and hose clamps, and finding nothing wrong, I had to start digging around. Well, didn't take me more than a minute to look at the front-intake to notice the impressions that two washers would have made when tightened down. No screws were there. Sure enough, I could move the intake ram around fairly easily, lifting it up a good 3 inches.
I lowered the hood to see where it would make a seal against the foam. Using some piano wire, I tried lifting the intake ram, and sure enough I can.
So there's our culprit. Loose front intake. Dealer did my last oil/filter change, so I'll have them install those bolts on their dime.
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