![]() |
|
|
|
Registered
Join Date: Mar 2004
Location: Los Angeles
Posts: 17,359
|
Engine knock question
I noticed wife's 07 Sienna van knocks when she backs up. It also does it from a dead start going up hill. It has 200k on the odo but I have been thinking about on and off for a few weeks and can't come up with an answer. Can't be cheap gas.
|
||
![]() |
|
Checked out
Join Date: Jun 2009
Location: On a beach
Posts: 10,127
|
Bad engine mounts?
|
||
![]() |
|
Registered
|
Engine knock or you just hear a knock? Possibly driveshaft U joints.
Also check the drive shaft hanger bearing, if the noise is from behind the engine.
__________________
87 930, Last edited by 908/930; 03-22-2022 at 06:51 PM.. |
||
![]() |
|
Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
|
Can you do a video with good sound, post here?
__________________
'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold |
||
![]() |
|
Registered
Join Date: Mar 2004
Location: Los Angeles
Posts: 17,359
|
|||
![]() |
|
Registered
Join Date: Mar 2004
Location: Los Angeles
Posts: 17,359
|
|||
![]() |
|
Registered
Join Date: Dec 2002
Location: Dahlonega , Georgia
Posts: 14,596
|
CV joints .
|
||
![]() |
|
Almost Banned Once
|
If the knock is coming from the engine - Probably the timing chain (if it has one) tensioner.
Timing chain tensioners are notorious for developing faults over time and a slapping loose chain can sound like a knock or rolling marbles.
__________________
- Peter |
||
![]() |
|
The Unsettler
|
I'm on board with slop in the drivetrain somewhere.
__________________
"I want my two dollars" "Goodbye and thanks for the fish" "Proud Member and Supporter of the YWL" "Brandon Won" |
||
![]() |
|
Fleabit peanut monkey
|
You replaced the front hub bearings not long ago?
CV joints kind of click when failing. Backwards as well. If you can get a recording that would help. Just have the boss drive it backwards and you stand outside with a cell phone. If you cant post to youtube, send it to me and I can, i'm pretty sure.
__________________
1981 911SC Targa |
||
![]() |
|
Brew Master
|
^^^ Those were my first two thoughts. What I would check first depends on when the noise appears.
__________________
Nick |
||
![]() |
|
Registered
|
I was thinking Savana not Sienna, wrong van. Yup, check CV joints.
__________________
87 930, |
||
![]() |
|
![]() |
Get off my lawn!
|
On my El Camino after about 260,000 miles I started hearing a knock if the temps were cold, the engine was not warmed up, and under a load. It sounded like a ball bearing bouncing in the piston. Once fully warmed up, or with medium grade gasoline, no knock. It would only knock with the lowest grade of gasoline.
It went another 40,000 miles and after 300,000 miles on the old 305, I swapped in a crate 350 and took the old 305 to the metal scrap yard and got 20 bucks for it. I never did find anything inside that looked that bad, but I did not care much. It was running fine when I turned off that engine for the last time.
__________________
Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
||
![]() |
|