2006 Prius Rattle Under Acceleration

My 2005 with almost 300k dose the same thing. It drove me crazy too. I am also pretty sure mine was ignition knock. If I put some high quality premium it seemed to go away or at least quiet it down. I've since noticed a lot of older high mileage Prii make this sound.

 

My little sister drives it now. She runs premium and doesn't care. She probably doesn't even notice. She drives with the music up all the time

 

How old is your engine oil? Have you followed some online guides for P0014 similar to this? Have you ever used engine cleaner in the car?

One way to help diagnose the problem would be get a Techstream Mini Vci cable for about $20 and then look at what misfires are recorded by the ECUs. It could offer some additional clues.

To me it seems like it could be anything from spark plug wires and coils to injectors needing cleaning to EGR valve leak to the engine starting to loose compression.

 

There’s no EGR in gen 2 Prius. Instead VVT-i system is used to achieve some internal EGR. This means that there’s no EGR valve or passages to block up. There are no spark plug wires either because it uses coil on plug.

 

I have the same problem I bought it with 180k . And now it has 296k. Amazingly the noisy sound like a diesel engine went away and now have a tekking noise which alot better but the tekking noise came with battery charging issue . Which I made a post for. The gas engine does not make any noise at all. If any one got torque app with custom pids for prius if u please let me know what do you get for mg2 gate measurement because I get nothing. I a suspecting mg2 is the problem for not charging the battery and making the noise. Toyota dealer all they tell you it is normal noise which is not because I seen many post that the noise start later on like 70 80 or 90k.

Posted via the PriusChat mobile app.

 

Keep us updated please! Also, try Car-part.com I love that website

 

It should work (at least almost as good). I (and probably others too) would be very interested what you find.

 

The Techstream software that comes with the cheap Mini-VCI can run tests on the car (running fans and pumps, for example), aid in some maintenance (brake and coolant filling and flushing) and can customize some features like the security system. Other non-Toyota scanners might not do that. The Mini-VCI cable hardware is not very robust, though.

 

It probably does. I would want to know if it's logging misfires. The Prius will tolerate quite a few misfires before throwing a code. In Techstream there's a specific screen I can look at that tells me the number of misfires it has logged (I've never seen it not at 0, but I'm only at 72k miles). If the scanner isn't logging misfires, then you might start checking other things, as it would point to i the engine not being the problem - could be transaxel etc. If it is, then there's probably some data included with the misfires - at what rpm they occur etc. This is probably a case where you'll have to eliminate a lot of things it's not before you find out what the problem is. Knowing if the car is logging misfires would be the first place I'd look.

Or considering the number of miles on the car, it's worth considering driving it until it fails, or at least throws a code. 300k is great run for the Prius. It's certainly possible to do a engine/transaxel swap if you have the skills.

 

Techstream is software writen exclusively/specifically for the Toyota family: Toyota, Lexus, Scion, Daihatsu (JDM).

The SnapOn reader is trying to be the Jack of all trades, master of none. It will likely read a lot of codes, but not ALL codes. Nor will it be able to do ALL of the diagnostics that manufacture specific software can. $4K sounds expensive, but it is relative.
*Toyota approved Mongoose OBD2 cable ($500) Drew Technologies
*ANNUAL Techstream software SUBSCRIPTION ($400 or $1096, depending on software level)
https://techinfo.toyota.com/techInfoPortal/appmanager/t3/ti?_pageLabel=ti_whats_tis&_nfpb=true
*Laptop that meets the software minimum requirements ($500+)
As you can now see, $4K was a ONE time expense. Cheap for one who makes their living working one cars.

The upside with you getting your own imitation Mongoose OBD2 cable and hacked Techstream software, is you can do the diagnostics at your leisure for any Toyota. The latest models will, likely require the latest software version of Techstream. $20-$30 imitation mini VCI cable + spare laptop = cheap convenience, and a very useful tool.

 

$675 for the car. CHEAP.

Yeah, throw in a used low mileage engine and transaxle. Hopefully get another 150K+ miles.

 

I get the same thing with mine. I attribute it to being a very basic engine internally speaking, probably the simplest component of the vehicle. It does seem that octane / detonation is a factor, so in addition to upgrading fuel you could also try a seafoam treatment or something along those lines.