Engine rattle at low rpm acceleration

How many miles on her? When you replaced the egr valve, was there a lot of carbon deposit present, particularly on the plunger or around where the plunger seats?

 

what made you try removing the plug to the egr?

 

68 k seems early for large carbon deposits. Have you experienced any oil consumption? Do you use Top Tier detergent fuel? Now that you have been able to determine the temporary fix, the challenge becomes addressing it. If you saw large carbon on the valve and cleaned the egr pipe, have you done the intake manifold? Egr cooler? Throttle body cleaning? Thrown any codes other than the ones you have when you disconnected the egr valve electronics?

 

Oil below the throttle plate is normal. Also consider the intake manifold for cleaning. The passages there can get plugged as well.

Did you just clean and inspect the spark plugs or did you already replace them? It would be a little early for replacement, but trying to establish what has been done to the car.

 

check 12v battery then do a compression check on engine ,you might have blown head gasket.

 

Did you find out what the problem was? I believe I am having the same issue. It doesn't vibrate at idle but a little above idle while at a steady cruising rpm. I have taken it into the dealer twice and they have changed the spark plugs and changed the EGR valve. It is also not giving a code for them to pull. I have an appointment next week when the factory tech is there and will post if they find anything.

 

experiencing the same issue. Was trying to clean IM, EGR Pipe, EGR valve, replaced spark plugs - didn't help. 2010 Prius 169k

 

Could you guys experiencing this problem, post a short video of the noise pls? The noise might be similar to a job I have done on a Prius 08. Might be coming from the valve train area, or in the piston/crankshaft location.

Does the rattle come up when you guys kinda accele lightly owhen driving?

 

I had a low RPM engine rattle that would appear when the traction battery was down to two bars & I was trying to accelerate from a stop. Sitting in the Prius, running the AC, the battery will get to 2 bars, then the ICE starts to recharge the traction battery. If I then decide to drive off, the engine will rattle when I am accelerating from a stop.
This was repeatable at any time.
Cleaning the fully plugged EGR Cooler was the solution to this problem. All of my EGR circuit (intake manifold, intake manifold pipe, EGR valve) had lots of carbon buildup. Only the EGR cooler was fully plugged.
Its been exactly a month since I've cleaned the EGR circuit & the problem has never reappeared

 

how would u rate in terms of complexity (x out of 10) to clean EGR cooler?

 

This is exactly what’s happening. Not necessarily having low battery level for that, just slight ICE acceleration below 20mph

 

Not difficult, a royal pita to get to...this thread is the documentation of my work:
Finally replaced EGR valve/cooler today | Page 2 | PriusChat

Another Prius Chat member, NutzAboutBolts, has created many fine maintenance videos located here:
Nutz About Bolts Prius Maintenance Videos | PriusChat

Specifically here you are going to need the 1) Spark plugs replacement video to remove the windshield wiper assembly, then you can use the 2) Cleaning intake manifold video to get the intake out of the way, then the last two are the 3) EGR pipe cleaning & the 4) EGR Cooler Removal/Cleaning video.

It does help to have a spare clean EGR cooler to install as the cleaning can easily take a couple days or more.

In the end it is all worth it.

Maybe think about installing an Oil Catch Can at the same time.

 

his same problem has being happening in a friends car recently. Maybe, would have all that intakes, and Engr, cleaned up, or replaced.

Dxta