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ohuggy
New User
Feb 3, 2009, 1:04 PM
Post #1 of 5
(2233 views)
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1998 Grand Voyager noise
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Hello! This one is the 3.3 with 100000 miles. Whenever the engine is braking the van a loud grinding/rattling noise is heard. No other symptoms. So if you apply a little gas while braking there is no noise, no noise in neutral, no noise under 30mph when engine idle is enough to prevent engine braking, doesn't matter if you're turning or applying the brakes. The noise frequency corresponds to vehicle speed not engine speed. Any ideas would be appreciated. Thanks!
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Loren Champlain Sr
Veteran
/ Moderator
Feb 3, 2009, 5:04 PM
Post #2 of 5
(2230 views)
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Re: 1998 Grand Voyager noise
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I'm sorry, but I don't understand what you are referring to as "engine braking". You did mention that vehicle speed does matter, but engine speed does not? Does the noise seem to be coming from the engine compartment, or a wheel?
Loren
SW Washington
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 3, 2009, 5:14 PM
Post #3 of 5
(2229 views)
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Re: 1998 Grand Voyager noise
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 Are you "Jake Braking" this vehicle? Or just talking about when engine is a slight drag when throttle is let off of?
Guess: An exhaust part is rubbing something that moves with the drivetrain - anywhere??
Engine mount may be at fault - try fighting engine and gas (go easy) with hood open in REVERSE (and forward too I guess) and see if engine moves too much??
T
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ohuggy
New User
Feb 3, 2009, 9:23 PM
Post #4 of 5
(2217 views)
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Re: 1998 Grand Voyager noise
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I'm talking about when engine is a slight drag when throttle is let off. I guess I could have explained it better: Whenever the the gas pedal is not pressed (cruise off) at any speed above 30mph and the van is in gear the noise is present.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 4, 2009, 2:15 AM
Post #5 of 5
(2212 views)
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Re: 1998 Grand Voyager noise
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Gotcha. You mean when trans engaged is a drag vs zero effect or power.
BTW - "Jake Braking" - TMK is when you purposely downshift instead of using brakes. Signage for diesel trucks is around saying it's illegal to do that in populated areas around me with that verbage!
As suggested the exhaust with a sideways engine like this has is torquing up and or down depending on forces against motor/trans mounts such that an inch of movement would translate to a foot up or down at tail pipe if it didn't flex. It is designed to tolerate just so much for engine/trans/exhaust parts against harder body metal parts or perhaps moving driveline parts but I tend to think this is confused with rubbing something directly or a resonance noise of some metal to metal touching somewhere.
Try the tailpipe jiggle (duh - watch out for it being hot) and you may duplicate the noise OR hit an innocuous part of exhaust with a rubber hammer to make a noise OR already suggest engine fight with brakes and forward/reverse trick.
The more common source is rusted/loose heat shields on converters, hangar parts rubber or not that are not in place or broken OR a flex pipe itself that has had enough flexing and needs replacement. Don't know the exact way - pipe or a joint that allows exhaust motion but would be up near engine.
If none of the above - perhaps a brake is just slightly dragging (front more suspect) and the forces opposite drive mode cause a noise. You'll find it and do look till you do,
T
PS:
Had to add a pics so it didn't seem like a joke about "Jake Braking"
(This post was edited by Tom Greenleaf on Feb 4, 2009, 2:20 AM)
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