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#4396379 - 05/04/17 04:34 PM 2011 Gen 3 Prius Misfire
Rtstrider Offline


Registered: 10/14/06
Posts: 460
Loc: Southeast
Hello everyone I have a Toyota Prius 2011 3rd gen around 155k miles that is throwing a misfire code on cylinder 3. I ran a can of the gumout (looks like the seafoam can) tuneup through the gas tank and the code disappeared for a month or so. I just got these plugs https://shop.advanceautoparts.com/p/denso-iridium-tt-spark-plug-ixeh20tt-4711/10713048-P?navigationPath=L1*14923%7CL2*15034 and am replacing them tonight weather permitting. I'm hoping I'm on the right track. Next thing is should there be anything else I need to look at while I'm in there? Say try testing the ignition coil? I've read where there have been fuel injector issues on these also. Any input is much appreciated!

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#4396383 - 05/04/17 04:38 PM Re: 2011 Gen 3 Prius Misfire [Re: Rtstrider]
javacontour Offline


Registered: 06/26/03
Posts: 10306
Loc: Illinois
You might want to swap the coil on cylinder 3 when you are changing plugs. I.E. use #2 on #3 and #3 on #2.

If you get another misfire, but on #2 cylinder, then the coil is suspect. If it's on #3, then it's something still common to that cylinder, like the fuel injector, wiring to the coil (or similar) or some mechanical issue.

Since you will have all the coils out to swap the plugs, it is no more work to put the #3 coil in another cylinder in case it's not an issue with the plugs.
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#4396393 - 05/04/17 04:54 PM Re: 2011 Gen 3 Prius Misfire [Re: Rtstrider]
CR94 Offline


Registered: 03/20/16
Posts: 1120
Loc: Western S.C. since 1996
On priuschat.com, I've read of several cases of misfire due to clogging of the EGR system, especially including EGR passages in the manifold, and the EGR cooler (heat exchanger). Typically such clogging occurs at around the mileage you report. As I understand, the manifold passages can be cleaned, but the heat exchanger is difficult to unclog.

My 2011 Prius has not had that problem yet, at a little under half the mileage you have.
_________________________
2011 Toyota Prius now at 88K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K

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#4396394 - 05/04/17 04:55 PM Re: 2011 Gen 3 Prius Misfire [Re: Rtstrider]
Rtstrider Offline


Registered: 10/14/06
Posts: 460
Loc: Southeast
Actually wife says it's running rough at idle also. Should I go ahead and test the coils first or swap out the plugs then test?

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#4396438 - 05/04/17 05:59 PM Re: 2011 Gen 3 Prius Misfire [Re: Rtstrider]
JimPghPA Offline


Registered: 08/22/09
Posts: 3859
Loc: Pittsburgh,PA U.S.A.
Several years ago our 2001 Impala was showing a misfire code on one of the cylinders and sometimes running rough. The dealer said to try a can of Sea-Foam so I did that. The problem went away for six months and came back. I tried another can of Sea-Foam and the problem went away, but came back a little shorter than six months. I tried another can of Sea-Foam and the problem went away, and came back in even a shorter time. I started to think about what could be causing this. The car still had the original fuel filter on it, so I reasoned that it was possible that the fuel filter was pretty well clogged up and that the Sea-Foam was opening up enough passage for the fuel to flow fast enough again. So I changed the fuel filter and the problem never came back.
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#4396534 - 05/04/17 08:10 PM Re: 2011 Gen 3 Prius Misfire [Re: Rtstrider]
Trav Offline


Registered: 11/20/06
Posts: 18900
Loc: MA, Mittelfranken.de
Plugs first, if there is still an issue then further diagnose. Don't get the horse before the cart.
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#4396544 - 05/04/17 08:23 PM Re: 2011 Gen 3 Prius Misfire [Re: Trav]
Chris142 Offline


Registered: 06/05/03
Posts: 16835
Loc: Deplorable in apple valley, ca
Originally Posted By: Trav
Plugs first, if there is still an issue then further diagnose. Don't get the horse before the cart.
this.
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#4396645 - 05/05/17 12:29 AM Re: 2011 Gen 3 Prius Misfire [Re: Rtstrider]
CT8 Offline


Registered: 10/09/14
Posts: 11009
Loc: Idaho
Have you been towing heavy loads with the Pri? sick
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#4396657 - 05/05/17 01:39 AM Re: 2011 Gen 3 Prius Misfire [Re: Rtstrider]
The Critic Offline


Registered: 08/30/04
Posts: 19809
Loc: CA
Check the plugs if they are still original, but it is likely not your issue.

If you have access to a scan tool, command the EGR during light acceleration and see if the misfire can be duplicated. If it does, remove the manifold and replace it with the updated manifold as outlined by the service bulletin.

Also, as previously mentioned, the EGR pipe AND the valve are notorious for clogging up on these. They have a water-cooled EGR system. If the clog is bad enough, it can cause a misfire as well. Remove the EGR pipe and the EGR valve. Fully disassemble the EGR valve and clean it up well. The EGR valve can be removed w/o removing the EGR cooler if you remove one of the studs for the EGR cooler.

Some of these motors will develop headgasket leaks as well, but hopefully that is not your issue.
_________________________
2011 Toyota Prius - 168k - ServicePro Dexos 0W-20
2007 Honda Accord 2.4 - 128K - Idemitsu 5W-20

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#4396662 - 05/05/17 02:00 AM Re: 2011 Gen 3 Prius Misfire [Re: Rtstrider]
CR94 Offline


Registered: 03/20/16
Posts: 1120
Loc: Western S.C. since 1996
Or to summarize the EGR components I listed earlier and others The Critic did, the entire EGR system is suspect---pipe, cooler, valve, and manifold passages. Clogging of the manifold causes uneven distribution of EGR to the cylinders, which causes misfire.
_________________________
2011 Toyota Prius now at 88K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K

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#4400299 - 05/09/17 02:50 PM Re: 2011 Gen 3 Prius Misfire [Re: Rtstrider]
Rtstrider Offline


Registered: 10/14/06
Posts: 460
Loc: Southeast
Alright guys I didn't have time to get to the car this past weekend. I'm going to give it a go this coming up weekend (hopefully). These spark plugs are very skinny! I'll keep everyone posted

edit: No towing with the prius


Edited by Rtstrider (05/09/17 02:51 PM)

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#4400319 - 05/09/17 03:09 PM Re: 2011 Gen 3 Prius Misfire [Re: Rtstrider]
The Critic Offline


Registered: 08/30/04
Posts: 19809
Loc: CA
Originally Posted By: Rtstrider
Alright guys I didn't have time to get to the car this past weekend. I'm going to give it a go this coming up weekend (hopefully). These spark plugs are very skinny! I'll keep everyone posted

edit: No towing with the prius


The spark plugs require a 14mm spark plug socket, not your usual 5/8". The windowshield wiper arms, cowl trim, wiper motor and cowl tray (lots of tiny bolts) will need to come out in order for you to access the plugs. Also, get the plugs from the dealer. They recently changed the spark plugs to a hotter temp range and none of the aftermarket catalogs (including Denso and NGK) reflect this yet.

Truthfully, your time is probably better spent on removing the EGR tube (4 nuts) and inspect that area before doing the plugs. If the EGR is plugged up, that is more likely to be your immediate problem.
_________________________
2011 Toyota Prius - 168k - ServicePro Dexos 0W-20
2007 Honda Accord 2.4 - 128K - Idemitsu 5W-20

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#4400321 - 05/09/17 03:10 PM Re: 2011 Gen 3 Prius Misfire [Re: Rtstrider]
Cujet Online   content


Registered: 02/15/03
Posts: 7164
Loc: Jupiter, Florida
As far as troubleshooting, I generally do not like more than one change at a time. The above suggestions are valid, and swapping coils is a good idea, as is checking the EGR. However, it is always nice to know the actual reason for the issue, just in case it pops up again.
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#4404587 - 05/14/17 04:52 PM Re: 2011 Gen 3 Prius Misfire [Re: Rtstrider]
Rtstrider Offline


Registered: 10/14/06
Posts: 460
Loc: Southeast
Alright changed the plugs and single cylinder 3 coil. The plug was ashed up and white. I pulled the egr tube cleaned it and the orifices it plugs into. The EGR system really wasn't too dirty. I also cleaned the throttle body which was basically spotless. We've driven about 20 miles and the code has come back. P0303. I'm thinking next step would be a fuel injector? Ideas?

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#4410053 - 05/21/17 01:50 AM Re: 2011 Gen 3 Prius Misfire [Re: Rtstrider]
The Critic Offline


Registered: 08/30/04
Posts: 19809
Loc: CA
Originally Posted By: Rtstrider
Alright changed the plugs and single cylinder 3 coil. The plug was ashed up and white. I pulled the egr tube cleaned it and the orifices it plugs into. The EGR system really wasn't too dirty. I also cleaned the throttle body which was basically spotless. We've driven about 20 miles and the code has come back. P0303. I'm thinking next step would be a fuel injector? Ideas?


Do you have access to a scanner? Follow the instructions on the bulletin and command the EGR system under the conditions described. See if the misfires appear during those conditions. If not, then we can revisit other options.
_________________________
2011 Toyota Prius - 168k - ServicePro Dexos 0W-20
2007 Honda Accord 2.4 - 128K - Idemitsu 5W-20

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