Important Chirping Pump Update...
 

I just spoke to a lead Toyota field tech here about the high pressure pump and he told me that they are aware of the lastest number SU003-05176 not getting the results they wanted. He says they are releasing a new (3rd) pump that will contain a better kind of diaphram of some sort to correct the issue. At the moment there is no ETA though so just be patient.

smoke and mirrors?

Not to worry, I'm a very reliable source for this info sir. Thing i'm waiting to find out is if this new pump will be a completely different number or if it will be the same part number just redone. Hope to know soon because I plan to have it done on my car as well.

Heh. There was a reason I was willing to wait before I asked for a new pump.

spoke with my main dude at toyota. toyota said they have the 3rd pump back ordered till first week of jan but that it still might not fully resolve the issue. it is still uncertain

Hmmm... Maybe this is why most cars have the fuel pump in the fuel tank? (to keep it cool and quiet)

There is a fuel pump in the tank already. There is also one on top of the engine which is the HPFP and the cause of the crickets/chirping.

Exactly my point. It's not in the fuel tank staying nice and cool, with any odd sounds muffled by the fuel.

You can blame Toyota for their D4S system. The only reason the HPFP is there is for the DI system. However, keeping the HPFP cool probably has nothing to do with reducing the crickets because if that were the case, there should be fewer complaints when the temps drop.

I suppose someone has just tried wrapping that puppy up with multi-layers of Dynamat to shut it up ... ??

:iono:

humfrz

I got a call from my dealer today that the 3rd gen HPFP is available and made an appointment to bring car in for its 2nd pump. I will want to see the part for sure.

Me too. The possibility of having my local dealers being the "we only fix it once" type, is something I don't want to deal with.



Wouldn't that be the one the OP said doesn't work and they are aware of not working?

How many pumps are we on? Are you guys counting the original pump as #1 or is the 1st replacement pump considered #1?

Depends on how you count it. Original pump, then came the second pump, and IIRC there was a mod to that one after it chirped. This will be pump four, I think. Noting wrong with mine, other than it chirps every now and then. I'll keep that one until a proven fix is out.

There has to be a pump close to the engine to maintain the 3,000+ psi required for current direct injection systems. This isn't a Toyota thing, many manufacturers have similar systems, and to be fair none of Toyota's systems sold in the 86 have failed at all. Compare to someone like BMW?

http://jalopnik.com/5673591/how-fans...ulty-fuel-pump

Porsche?

http://forums.rennlist.com/rennforum...p-failure.html

Toyota's D4-S system is tried and tested and has been in production for 7 years, I can't believe people keep calling it shit when the alternative is Subaru's DI system, oh wait they didn't have one production ready until Toyota shared the plans for D4-S.

http://www.toyoheadquarters.com/thre...-scion-frs.43/


The most recent TSB states that the new pump has 'revised insulation' to quiet the noise. It didn't work.

On my original pump, 17k miles, noise went away around 10k and I'm happy as a clam.
:cheers:

I'll follow up again with my service rep about this. I'm in the same boat as the OP. Toyota is realizing that this pump is STILL not working 100%. I'll be one of the first on the list for the next revision. It's not fun going to car shows with a box of crickets under your hood.

I had the SU003-05176 installed and crickets came back in 250 miles. It's no good. Both this pump and my pump from a year ago always chirped. I'm at 12.6k miles.

To help you guys on this one...no there is NO fourth pump. This will basically be the 3rd attempt to get it right. Hope we all see the new one soon.

Original pump being the 1st attempt

I understand the reason for the hpfp. My point is that if the engine only ran port injection, there would be no need for the hpfp. Other cars with hpfp's don't chirp so yes, it is a Toyota D4S thing. And just to be clear, I know D4S exists on other cars. I'm referring to the fact that it's a system designed by Toyota and obviously poorly designed for our cars. I have not heard chirping on an is350 or gs350, both have D4S systems.


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Wait, since when has the oct 17 tsb been deemed a failure? Almost all good things about this one. I've gone over 4k on mine since getting it and not a chirp.

*moves hand*

This is the fuel pump you are looking for.

The problem seems to be totally random, which must make it very hard to determine the actual cause. I still think it's cavitation related to water content.

Maybe I rev too high but I never hear "chirps" only the clicky type normal DI sound at idle. I have a first US shipment car.

I never went in for service because there no permanant fix. I will wait and see...hate going to stealership

Hopefully I get the new one as I was ordered one two weeks ago otherwise I should wait and see. It's only a minor annoyance.

My chirps are highly affected by ambient tempurature. When its hot out, once i reach operating tempurature the chirps are constantly happening at idle. When its could out, the chirps come and go

Mine are consistent no matter what the temps. Once the engine is all warmed up, they manifest.

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Interesting. I'm on what i believe is rev.2, I got mine replaced early september. Wonder if thats the difference.

I'm on the original pump and won't replace it until there is a confirmed fix with more than a few months of use and a couple thousand miles under it's belt.

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I think you missed the point of my post, without DI Tada claims they could only get 120 hp out of the 2.0L boxer with Subaru and that D4-S is far from crappy with only a minority (who predominantly track and mod) suffering failures of the DI seals. A funny noise is just a funny noise, it bothers some but not all.

I understand your point. My point is that Toyota failed in their design/QC of the HPFP for their implementation of D4S in the twins as evidenced by the IS350/GS350 which do not chirp. The fact that they are on their 3rd revision of the pump indicates that they still are making blind attempts at resolving the issue.

Ah, see I don't consider the 'chirp' a failure. I consider a (so far) reliable 200 hp 2.0L boxer that gets good gas mileage a success. Agree to disagree, cheers.

:cheers:

We will have to agree to disagree as you stated then. Considering NVH is a major component in car design these days, I would definitely consider the chirping a failure. It has not been proven to cause any issues thus far, but it is still a failure in my mind because of the added NVH that shouldn't be there. It's not like the STi where Subaru didn't put any sound deadening in the cabin and put disclaimers on their brochures when it was released. This chirping is not an intended design feature.

dynamat absorbs vibration to reduce noises produced by vibrating surfaces but does not block sound very well. some mass loaded vinyl will work better I think...

Same here. It's usually chirping like crazy by the time it's fully warmed up (temp gauge at ~50% mark). Aside from the obnoxious noise, the pump performs well enough. I'll be waiting for a confirmed long-term 'fix' before bothering Subaru about a replacement.

I'm on my original pump too. I got the noise around 1500 miles, it went away a few thousand miles later as well. However, it came back at 20k miles...now it's mostly gone again for the winter.

You're damned right it counts as a failure.

I made the visual analogy long ago of the engineers all standing around the first time they fired it up and heard the crickets for themselves...they all looked around and began giving out "hi fives" to each other for what would only be considered an awesome sound that every owner would be proud to show off to their neighbor and other potential customers.

In reality, they probably cringed...likening the sound to that of an old, beat to shit engine that needs one or more belts replaced.

Nah, who am I kidding. They're quite proud of the noise the engine makes, that's why they keep making revised pumps that clearly cost zero money to redesign.

LOL at the haters, fuel-pump designers and fluid dynamics PhD's.

I told my service adviser to just give me another shot at the latest pump version again if they can. Waiting to hear info about a possible "another" revision to the current SU003-05176 pump but with the holidays around, might not get an answer till after New Years.

I hope to know soon. After New Years is looking more and more likely.

Woodpeckers in the engine bay are where it's at