I just filled up last week, $2.65/gal at Costco, lowest in years.
I was wondering about rats, we have a lot of them here, they eat oranges in the engine bays.
I didn't want to pull the engine covers in the rain for a "quick" visual inspection, which is easy on the Fords.
I forgot I had a ScanGauge mounted in another vehicle so after hooking it up to the RX it shows a P0304 - Misfire on #4.
I didn't know the firing order layout and found some drawings on Google.
Is #4 really the center cylinder in the front of the vehicle? Strange layout.
Yay!, Should be easy to check, I thought #4 would be in the back.

 

Found my problem.
Looks like the appetizer was escargot.


Followed by a main course of tangerines.


The #4 fuel injector was missing 2" of wire.


Repaired and running great, again.

 

Yes, and that dealer or service person is wrong.
The fuel injector and spark plug coil wiring is simple two wires that are easily repaired.
The wires are wrapped in electrical tape and have split wire loom protecting them, but they are not "shielded".
Replacement connector pigtails are available - ebay or some parts stores.

 

Nice fix - well done. Now, how will you keep the rats away?

 

Thanks, we had cut back a row of bushes in front of the car and there were snails around them.
I'm parking the car on the other side of the driveway until the neighbors tangerines are done.
I have some peanut butter dessert on a special plate for them (on top of a shed between the tree and the driveway).

 

Same thing happened to our RX450h back in November last year.

According to Lexus dealership some rodent chewed the wires in the engine bay. Cost around $650 to fix. It's all good now.

 

Same here on my 2010 Lexus Es350
#4 Injector connector was chewed
Ordered the pig tail to reconnect
and Rodent device for engine bay from Amazon - hope it works
I will not use that foamy lexus engine cover any more.

 

2015 RX 350. Can you please provide the name ( or part no ) for this wire which is chewed by squirrel. ?
Respectfully,

 

Intake air control valve assembly

 

Hello Mesquite77. Thanks for your quick reply. I did a google search with 'intake air control valve assembly wiring' but could not find anything...What will be my correct search criteria ? Thanks for all your help

Regads,

 

This link excerpt is to a free online Toyota Sienna service manual as it has the same engine as the RX. It does not appear to have wiring diagrams, but under engine, it shows the intake air control valve. You can probably find electrical wiring info somewhere else online.
From a practical repair perspective, you may be better off finding another Toyota or Lexus with the 3.5 V6 to inspect and photograph the wiring to help with your repair or maybe another member will provide a photo of their wiring for you to copy in the repair.
http://www.tsienna.net/engine-724.html

 

Was running fine a few days ago. Has sat in a garage a few days and now today has this issue.

Only things I see obviously "wrong" with my limited knowledge is the wires to this box in the top left of the engine bay look chewed up. (I don't see any obvious mouse nest things though.)






Not sure what that box is for or if that would even ultimately cause the issue.

Thanks for any help everyone!

 

Not to scare you or anything but from what I've read, usually the nest is behind the glove box on the cabin air filter. Remove that and see if you see traces.
Also, do you park at a space where there's rats or mice?

 

Has been in this garage for years and never had an issue with rats or mice. But I suppose that doesn't necessarily mean much.

I'll have to check later. Best access to that is through the glovbox maybe?

 

Yeah removing the cabin filter is really easy and it's through the glove box.