Our RV makes a loud knocking when all 3 of the following occur simultaneously, overdrive kicks in, engine fan system turns on and accelerator is pushed. Does anyone have an idea of what could be causing this? Thanks so much for any help.

A few more particulars are necessary.MAKE MOCDELENGINE |YEARWithout any more info the only thing I can say is try changing the KNOCK SENSOR if your rig has one. Most do.

Moved from Forum Technical Support

Without more info, I'd add check the fan clutch and the water pump shaft for loose bearings. It would be helpful to break out whether this is engine spark knock...

Try using premium fuel and see if that helps. Cost more but may be worth it.

2003 Tiffin Allegro Engine is a Workhorse 8.1. Thanks!

Engine knocking | Good Sam Community

TXiceman
Explorer II
Aug 29, 2015
How many miles on the engine. It may be a carbon build up in the heads and is causing pre-ignition. Premium fuel will help.

Have the engine checked for proper timing and advance.

Ken
azrving
Explorer
Aug 29, 2015
Loose, cracked flex plate?
DeeBo
Explorer
Aug 29, 2015
2003 Tiffin Allegro Engine is a Workhorse 8.1. Thanks!
Mike_Taverniti
Explorer
Aug 29, 2015
Try using premium fuel and see if that helps. Cost more but may be worth it.
tpi
Explorer
Aug 29, 2015
Without more info, I'd add check the fan clutch and the water pump shaft for loose bearings. It would be helpful to break out whether this is engine spark knock...
1492
Moderator
Aug 29, 2015
Moved from Forum Technical Support
darsben
Explorer II
Aug 29, 2015
A few more particulars are necessary.
MAKE
MOCDEL
ENGINE |
YEAR
Without any more info the only thing I can say is try changing the KNOCK SENSOR if your rig has one. Most do.

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Engine knocking

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