During start up I am getting knocking noise..

Egr circuit needs to be cleaned

 

What code?

 

IF your 12 V battery really IS 10 years old (or more), then THAT is the first thing you should replace.......just because.
Then I bet if you search on here for "knock", you will get many pages of hits.

 

Do you know when this upgrade/recall was issued from Toyota?

 

never heard of it

 

Me neither, I've replaced the EGR more than once and it was never brought up.

 

Interesting. If there had been an EGR recall I would have thought it would be big news here considering how much time and work a lot of us have put into cleaning the damn things. What harness does this refer to? Which pipe got bigger? The pipe connecting the cooler to the intake manifold or the cooler itself? I'm most curious about what they did to your car.

 

can you post the work order?

 

Could you please follow up with more details? It would be incredibly helpful information to have on this forum.

 

At how many miles was the EGR worked on. Cus' it needs to be recleaned, every 50~100K.

 

On April 9, 2020 I had my EGR valve and pipe, intake manifold and pcv valve replaced. Did not solve the rough idle on cold start problem, but after warm up, it runs smooth as silk and my mileage went up. Check engine light has not come back on - yet. Been doing a lot of research on direct injection of fuel and the problems associated with it. Scary stuff on the carbon build up on the valves and injectors. With the amount of miles you have, could be an issue. Intake manifold too. I have a 2010 with 165K miles.

 

So it was on before, this is what precipitated the parts replacements? Who did the work, did they disclose the codes?

Ugh, all of those items are eminently cleanable. You can DIY all of that for near-zero outlay. Just the cost of cleaners, and replacement of the flexible gaskets, if they're looking compressed.

You say EGR "valve". The main EGR component is a combined valve and "cooler". The latter is upstream of the valve, bolts to the exhaust manifold. Was that replaced? If not it could be your problem. Of all the components it's arguably the most clog-prone. The "cooler" is highlighted here:



If you can scan and post an invoice with the part numbers that would clarify.

 

Stick to top tier gasoline, run valve & injector cleaners from time to time to keep the carbon boogey man away. Or go EV.

 

This entire thread is a bust and should be deleted. I'm pretty sure there was no EGR recall and what OP wrote about having a "harness" replaced and a "bigger pipe" installed doesn't make any sense whatsoever. Nor does the claim that they previously brought their car in to their dealer for the upgrade that was never completed. This thread contributes absolutely nothing as a resource and would just confuse any future viewers who might be looking into the issue.

 

Wait, gen 4 comments are also needed like every other thread here.

 

Here you go: Has anyone cleaned their Gen-4 EGR cooler? What was its condition/mileage?

Related to this thread, everything "downstream" from the OP's EGR cooler has been replaced, but as Mendel notes, the cooler itself is still suspect. It's like getting a knee replacement when you still have a broken hip!

 

Ever clear a gutter, all the way to a storm drain? Say of leaves, snow, whatever? You've got to clear the full length of it: leave one bit blocked and it's all for naught.

I thiink main stumbling block is OP is not that savvy, had the work done by "someone", didn't get into it himself. Considering the wholesale parts replacement, might have been a dealership, sounds like their modus operandi. But not clear.