I NEED Boost... Opinions puh-lease - Page 23 - Toyota Yaris Forums

Focus_Sh1ft · 12-18-2012, 05:45 PM

Didn't realize front O2 sensors are $160... For a part I don't even need. Ugh -.-

CTScott · 12-18-2012, 05:49 PM

Quote:

Originally Posted by Focus_Sh1ft

Didn't realize front O2 sensors are $160... For a part I don't even need. Ugh -.-

You can get the generic Denso 2349052 for under $100.

cali yaris · 12-18-2012, 06:51 PM

Or one off my shelf.

Golddeenoh · 12-18-2012, 09:02 PM

oh now Garm says he has one. :P

Focus_Sh1ft · 12-18-2012, 10:39 PM

Bleh, I was using a different denso part number and was only turning up $130 at best. Oh well.

So yeah, no big difference with it in. Car spends a bit more time around stoich but continues to trend toward the lean side. Also, integration relay and PCV valve are fine.

I'm gonna have my mechanic smoke test the intake tomorrow and see if he has any other ideas. I did a typical boost leak test and the intake did hold some pressure, but all symptoms still point to a vacuum leak. Definitely need some peace of mind on this. It's a lot more plausible than something going wrong with a completely stock, completely untouched fuel regulator.

If not, I'm going to drive it enough to complete some drive cycles. I see no other options.

Focus_Sh1ft · 12-19-2012, 05:58 PM

Spent the last few hours combing over the car with my mechanic... and nothing.

-Fuel pressure was fine
-Smoke test turned up nothing
-All sensors are within range via OBDII

We were finally able to get a P0171 code thrown, but that's it. The trims were everywhere - off gas they were trimming fuel like crazy, while on gas it was adding way too much fuel. In other words, they've never seen anything like this before.

So at this point, the only thing that can't be ruled out 100% is the ECM. However, the replacement ECM didn't do anything. The one and only remaining cause is a problem with the harness. Here's what I'm thinking

-Sweet talk someone at Toyota into doing some monitoring with the techstream tool. If the ECM is compromised or a short/open in the harness, it should show up.
-If not, attempt to continuity check EVERY SINGLE WIRE on the ECM (dear lord). I don't even know if the information for this is actually readily available.
-If not, attempt to source a replacement harness

Otherwise... We're talking complete engine replacement. I knew the day would come, but I thought it would be because I BLEW the engine, not some electrical BS.

CTScott · 12-19-2012, 06:05 PM

Quote:

Originally Posted by Focus_Sh1ft

Spent the last few hours combing over the car with my mechanic... and nothing.

-Fuel pressure was fine
-Smoke test turned up nothing
-All sensors are within range via OBDII

We were finally able to get a P0171 code thrown, but that's it. The trims were everywhere - off gas they were trimming fuel like crazy, while on gas it was adding way too much fuel. In other words, they've never seen anything like this before.

So at this point, the only thing that can't be ruled out 100% is the ECM. However, the replacement ECM didn't do anything. The one and only remaining cause is a problem with the harness. Here's what I'm thinking

-Sweet talk someone at Toyota into doing some monitoring with the techstream tool. If the ECM is compromised or a short/open in the harness, it should show up.
-If not, attempt to continuity check EVERY SINGLE WIRE on the ECM (dear lord). I don't even know if the information for this is actually readily available.
-If not, attempt to source a replacement harness

Otherwise... We're talking complete engine replacement. I knew the day would come, but I thought it would be because I BLEW the engine, not some electrical BS.

I have a Techstream. Take a run up to CT.

Focus_Sh1ft · 12-19-2012, 06:17 PM

I wish I could Scott, but with how the car is running it's not feasible. Thanks for the offer tough.

I was thinking though... If I shipped you one of these ECMs I have, could you possibly confirm if it's in a working state? Obviously doing the check through my car and thus the harness would be best but... Yeah. Still, if I could find out if the ECM is good or bad, that's still a pretty good datapoint.

One other thing regarding checking the harness... In the service manual's ECM pinout, would I be right in thinking the two pins listed under 'Symbols (Terminal No.)' should always have continuity?

CTScott · 12-19-2012, 06:20 PM

Quote:

Originally Posted by Focus_Sh1ft

I wish I could Scott, but with how the car is running it's not feasible. Thanks for the offer tough.

I was thinking though... If I shipped you one of these ECMs I have, could you possibly confirm if it's in a working state? Obviously doing the check through my car and thus the harness would be best but... Yeah. Still, if I could find out if the ECM is good or bad, that's still a pretty good datapoint.

One other thing regarding checking the harness... In the service manual's ECM pinout, would I be right in thinking the two pins listed under 'Symbols (Terminal No.)' should always have continuity?

I can definitely check out the ECM for you. I can also give you a list of specific harness points to check (the ones most likely related to the behavior).

Focus_Sh1ft · 12-19-2012, 06:25 PM

Quote:

Originally Posted by CTScott

I can definitely check out the ECM for you. I can also give you a list of specific harness points to check (the ones most likely related to the behavior).

I would definitely appreciate the harness points list. I'll get back to you on the ECM though. I need to see how the dealership responds to my request first. Considering we've bought three cars from them, I hope reasonably...

CTScott · 12-21-2012, 10:43 PM

Quote:

Originally Posted by Focus_Sh1ft

I would definitely appreciate the harness points list. I'll get back to you on the ECM though. I need to see how the dealership responds to my request first. Considering we've bought three cars from them, I hope reasonably...

Here it is:

Yaris ECM - Connections.pdf

Focus_Sh1ft · 12-22-2012, 08:48 PM

Wow, that is comprehensive. Must have taken awhile to put together too. Thanks!

CTScott · 12-22-2012, 09:10 PM

Quote:

Originally Posted by Focus_Sh1ft

Wow, that is comprehensive. Must have taken awhile to put together too. Thanks!

Fortunately I had most of it together from some past projects. Start with checking out the wires related to the injectors, coils, cam, crank, and MAF. If those all check out, then the next stop would be the AFR and O2 sensors.

Focus_Sh1ft · 01-09-2013, 04:02 PM

Been away for the last two weeks, but got back into troubleshooting yesterday. It looks like I've [unfortunately] found the problem...

Short story: Blew the head gasket

Long story: Finally decided to bite the bullet and get Toyota involved. I was lucky enough to get a really cool tech who was interested in the car. First thing we did was hook up the techstream tool. Get this - there were five codes that were being thrown EVEN THOUGH THE CHECK ENGINE LIGHT WAS OFF. Only his Mongoose cable was able to retrieve them. That is the biggest load of bull. Anyway, had P0300, 0301, 0302, 0303, and 0172. Since the plugs are ruled out, he said it's possible (especially with a hotter plug) that the coils burnt out. It seems unlikely all four would go, but apparently it's happened before.

So after running the engine a bit, we removed all four plugs. Out of cylinder one (and only one) you could hear air escaping/vacuum. That was the first nail in the coffin. After that, we topped off the coolant and ran a coolant reservoir with the engine on. Sure enough, there were air bubbles and small pieces of aluminum...

I still don't fully understand how a head gasket leak would cause issues such as misfires, but the guy working with me was very knowledgeable. My coolant temperatures were never excessively hot, and there isn't any coolant leaking out of the head either.

So, that's it. There's a lot I need to figure out, but I refuse to return the car to stock.

Bluevitz-rs · 01-09-2013, 04:28 PM

through in a new head gasket and maybe turn the boost down a bit. Or try and find a stronger one? I guess it depends on where the leak is when you get it apart. You'll probably find a tiny slit of black on the deck where the leak was. I've experienced this exact head gasket problem on a B18 LS Vtec on my friends old race car. Car kept overheating though, no other issues.

cali yaris · 01-09-2013, 04:28 PM

Get that tC out and park the Yaris?

Focus_Sh1ft · 01-09-2013, 06:20 PM

Quote:

Originally Posted by cali yaris

Get that tC out and park the Yaris?

I wish it was that simple. Of course this had to happen mid winter...

I plan on upgrading the head gasket if there is a better one available. I'll probably begin tearing down the engine tomorrow, but going to do another compression test first (did the other one wrong apparently).

Can anyone chime in on the best way to deal with the timing chain?

yaris2010RS · 01-10-2013, 03:41 PM

PULL! lol
What do you mean "Deal" with it?

12-18-2012, 06:51 PM	#3
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,857	Or one off my shelf. __________________ Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific.

12-18-2012, 09:02 PM	#4
Golddeenoh Takes corners too fast! View User's Garage Drives: Absolute Red 2009 Yaris HB Join Date: Apr 2012 Location: Columbia, SC Posts: 830	oh now Garm says he has one. :P __________________ mods:15''Drag DR21 w/Nitto NeoGen 205/50R15, Tanabe DF210 lowering springs 1.6/1.8, TRD Rear Sway Bar, Tanabe Front Sway Bar, Micro Image Short Throw Shift Kit (both in and under), 8.64lbs flywheel, F1 Stage 4 Clutch, AEM Cold Air Intake (Red), Megan Racing Header, DC Sports Axle Back Exhaust, Micro Image Crank Pulley, NST lite Alternator Pulley, ARP Manifold Stud Kit,Tanabe Front Strut Tower Brace, ScanGuage II, Micro Image Silicone Radiator Hose Kit (Red), NRG Carbon Fiber Shift Knob (round), 2009-2011 Toyota Yaris Liftback Foglight kit, NRG Grounding Kit (Red), Hella Horns(Red),CF Hood

01-09-2013, 04:28 PM	#16
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,857	Get that tC out and park the Yaris? __________________ Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific.

01-10-2013, 03:41 PM	#18
yaris2010RS View User's Garage Drives: no-longer-boosted '10 Yaris Join Date: Nov 2009 Location: Angus, Ontario Posts: 1,886	PULL! lol What do you mean "Deal" with it? __________________ If it has boobs or wheels sooner or later your gonna have problems with it

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12-18-2012, 05:45 PM	#1
Focus_Sh1ft Drives: 08 Yaris Turbo; 06 tC Turbo Join Date: Jan 2010 Location: New Jersey Posts: 875	Didn't realize front O2 sensors are $160... For a part I don't even need. Ugh -.-

12-18-2012, 10:39 PM	#5
Focus_Sh1ft Drives: 08 Yaris Turbo; 06 tC Turbo Join Date: Jan 2010 Location: New Jersey Posts: 875	Bleh, I was using a different denso part number and was only turning up $130 at best. Oh well. So yeah, no big difference with it in. Car spends a bit more time around stoich but continues to trend toward the lean side. Also, integration relay and PCV valve are fine. I'm gonna have my mechanic smoke test the intake tomorrow and see if he has any other ideas. I did a typical boost leak test and the intake did hold some pressure, but all symptoms still point to a vacuum leak. Definitely need some peace of mind on this. It's a lot more plausible than something going wrong with a completely stock, completely untouched fuel regulator. If not, I'm going to drive it enough to complete some drive cycles. I see no other options.

12-19-2012, 05:58 PM	#6
Focus_Sh1ft Drives: 08 Yaris Turbo; 06 tC Turbo Join Date: Jan 2010 Location: New Jersey Posts: 875	Spent the last few hours combing over the car with my mechanic... and nothing. -Fuel pressure was fine -Smoke test turned up nothing -All sensors are within range via OBDII We were finally able to get a P0171 code thrown, but that's it. The trims were everywhere - off gas they were trimming fuel like crazy, while on gas it was adding way too much fuel. In other words, they've never seen anything like this before. So at this point, the only thing that can't be ruled out 100% is the ECM. However, the replacement ECM didn't do anything. The one and only remaining cause is a problem with the harness. Here's what I'm thinking -Sweet talk someone at Toyota into doing some monitoring with the techstream tool. If the ECM is compromised or a short/open in the harness, it should show up. -If not, attempt to continuity check EVERY SINGLE WIRE on the ECM (dear lord). I don't even know if the information for this is actually readily available. -If not, attempt to source a replacement harness Otherwise... We're talking complete engine replacement. I knew the day would come, but I thought it would be because I BLEW the engine, not some electrical BS.

12-19-2012, 06:17 PM	#8
Focus_Sh1ft Drives: 08 Yaris Turbo; 06 tC Turbo Join Date: Jan 2010 Location: New Jersey Posts: 875	I wish I could Scott, but with how the car is running it's not feasible. Thanks for the offer tough. I was thinking though... If I shipped you one of these ECMs I have, could you possibly confirm if it's in a working state? Obviously doing the check through my car and thus the harness would be best but... Yeah. Still, if I could find out if the ECM is good or bad, that's still a pretty good datapoint. One other thing regarding checking the harness... In the service manual's ECM pinout, would I be right in thinking the two pins listed under 'Symbols (Terminal No.)' should always have continuity?

12-22-2012, 08:48 PM	#12
Focus_Sh1ft Drives: 08 Yaris Turbo; 06 tC Turbo Join Date: Jan 2010 Location: New Jersey Posts: 875	Wow, that is comprehensive. Must have taken awhile to put together too. Thanks!

01-09-2013, 04:02 PM	#14
Focus_Sh1ft Drives: 08 Yaris Turbo; 06 tC Turbo Join Date: Jan 2010 Location: New Jersey Posts: 875	Been away for the last two weeks, but got back into troubleshooting yesterday. It looks like I've [unfortunately] found the problem... Short story: Blew the head gasket Long story: Finally decided to bite the bullet and get Toyota involved. I was lucky enough to get a really cool tech who was interested in the car. First thing we did was hook up the techstream tool. Get this - there were five codes that were being thrown EVEN THOUGH THE CHECK ENGINE LIGHT WAS OFF. Only his Mongoose cable was able to retrieve them. That is the biggest load of bull. Anyway, had P0300, 0301, 0302, 0303, and 0172. Since the plugs are ruled out, he said it's possible (especially with a hotter plug) that the coils burnt out. It seems unlikely all four would go, but apparently it's happened before. So after running the engine a bit, we removed all four plugs. Out of cylinder one (and only one) you could hear air escaping/vacuum. That was the first nail in the coffin. After that, we topped off the coolant and ran a coolant reservoir with the engine on. Sure enough, there were air bubbles and small pieces of aluminum... I still don't fully understand how a head gasket leak would cause issues such as misfires, but the guy working with me was very knowledgeable. My coolant temperatures were never excessively hot, and there isn't any coolant leaking out of the head either. So, that's it. There's a lot I need to figure out, but I refuse to return the car to stock.

01-09-2013, 04:28 PM	#15
Bluevitz-rs 1NZ-6spd View User's Garage Drives: '05 6-Spd Vitz RS Join Date: Oct 2008 Location: Oshawa, Ontario, Canada Posts: 2,967	through in a new head gasket and maybe turn the boost down a bit. Or try and find a stronger one? I guess it depends on where the leak is when you get it apart. You'll probably find a tiny slit of black on the deck where the leak was. I've experienced this exact head gasket problem on a B18 LS Vtec on my friends old race car. Car kept overheating though, no other issues.