Difference of Plug W20EXR-U & W20 EX-U

Home > Gari Forums > Others Forums > Others Other Forums > Others Other Engine Forums

Difference of Plug W20EXR-U & W20 EX-U

The corolla EE100 XE (model 1993 to 2000) is required to be installed with Denso W-20EXR-U plugs as per the manual. Does that 'R' mean extra resistance & only serves to stop the hissing sound in radio or it plays some role in combustion also? The cost of W20 plug with & without 'R' is Rs. 40/- People say that there is no need to install plug with 'R' & Denso W20EX-U is equally good. What is the truth??

Gari.pk User 7722 asked on 27 Aug 2010 09:57:37 am

1 Answer

197 views |

Huzaifa - on 27 Aug 2010 09:57:47 am

Hello!
yeah you got it rite..R is there for Resistance and W20EX-U and W20EXR-U surely have difference.......!

For reducing electrical noise for radio, sound system etc, many modern ignition systems require resistor plugs to stop electrical noise from interfering with the vehicle's on-board electronic control units (ECUs). If non-resistor plugs are used in place of resistor ones, the result can be malfunction Resistor spark plugs should always be fitted, therefore,where specified.

SO its better to get that W20EXR-U rather than W20EX-U
Regards