|
Other Vehicles & General Automotive Discussions Discuss all other cars and automotive news here. |
|
Thread Tools | Search this Thread |
10-19-2020, 09:26 AM | #1 |
The Dictater
Join Date: Apr 2017
Drives: '13 Red Scion FRS
Location: MD, USA
Posts: 9,509
Thanks: 26,348
Thanked 12,529 Times in 6,205 Posts
Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
|
Help Troubleshooting Subaru 3.6L
Hi All, figured I'd ask the Subaru junkies-ahem-enthusiasts for advice.
My wife's car is a 08 Subaru Tribeca with a 3.6 H6 (EZ36D). Driving down the road, it started lurching as though it were misfiring. Surely enough CEL showed up. Stopped it, checked to make sure there was nothing visibly wrong, got it to a gas station to fill up because it was pretty low, then got it home. Pulled codes and sure enough, two codes for misfiring on cylinders 5 and 6. I believe these are the back cylinder on both banks. So some history. This car doesn't get driven much, just had an oil change and has a new catback because the old one had a hole that failed inspection. I didn't have time to do it myself, so I let the inspecting shop do the recent work. I had driven the car 2 days before and there were no problems. It had about 1/8 tank of gas when this happened. The Tribeca is stored outside if that matters. I doubt any ignition components have ever been replaced. An interesting note is that above ~2500-3000 rpm it drives fine. No lurching at all. It's a sudden change like hitting that rpm (don't know which rpm value precisely) flips a switch. My troubleshooting so far: I didn't see any leaks, oil level looks fine, and I filled the gas tank with 93 (it'll take 87 but I wanted to see if bad gas was the problem) and ran the engine for a bit in neutral to see if it got better. I do not think it's a matter of resetting codes because the physical symptoms are still there. Easy next step is spark plugs/coil packs, but it's a bit odd that two different cylinders would go out at exactly the same time? Another possibility a friend pointed out is fuel pressure problems. Any thoughts? |
10-19-2020, 11:23 AM | #2 |
Senior Member
Join Date: Jul 2014
Drives: 2020 Hakone
Location: London, Ont
Posts: 69,845
Thanks: 61,656
Thanked 108,289 Times in 46,456 Posts
Mentioned: 2497 Post(s)
Tagged: 50 Thread(s)
|
Fuel filter.
Lower rpms not getting enough flow starving cylinders and getting misfires. Higher rpms create enough flow to run fine. Sounds counter intuitive but I have had it with other cars.
__________________
Racecar spelled backwards is Racecar, because Racecar.
|
The Following User Says Thank You to Tcoat For This Useful Post: | Spuds (10-19-2020) |
10-19-2020, 11:36 AM | #3 |
The Dictater
Join Date: Apr 2017
Drives: '13 Red Scion FRS
Location: MD, USA
Posts: 9,509
Thanks: 26,348
Thanked 12,529 Times in 6,205 Posts
Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
|
Yeah, that was a possibility I talked about with my friend. I suppose I should start there. In the fuel tank... that's now full of fuel...
|
The Following User Says Thank You to Spuds For This Useful Post: | Tcoat (10-19-2020) |
10-19-2020, 12:09 PM | #4 |
Senior Member
Join Date: Jul 2014
Drives: 2020 Hakone
Location: London, Ont
Posts: 69,845
Thanks: 61,656
Thanked 108,289 Times in 46,456 Posts
Mentioned: 2497 Post(s)
Tagged: 50 Thread(s)
|
Not sure where the filter is on those. Maybe get lucky and it is an in-line?
__________________
Racecar spelled backwards is Racecar, because Racecar.
|
10-19-2020, 01:33 PM | #6 |
Senior Member
Join Date: Jul 2014
Drives: 2020 Hakone
Location: London, Ont
Posts: 69,845
Thanks: 61,656
Thanked 108,289 Times in 46,456 Posts
Mentioned: 2497 Post(s)
Tagged: 50 Thread(s)
|
Well that sucks.
__________________
Racecar spelled backwards is Racecar, because Racecar.
|
The Following User Says Thank You to Tcoat For This Useful Post: | Spuds (10-19-2020) |
10-19-2020, 06:03 PM | #8 |
Senior Member
Join Date: Jan 2016
Drives: hyper blue
Location: east tn
Posts: 404
Thanks: 166
Thanked 262 Times in 156 Posts
Mentioned: 2 Post(s)
Tagged: 2 Thread(s)
|
i had an 06 but it was just the 3.0 with variable lift and timing on the intake. no issues ever besides speed sensor wires to 140k.
move the coils around and see if the codes move to those cylinders. a ratcheting gear wrench or a 1/4" drive fits. |
The Following User Says Thank You to thomasmryan For This Useful Post: | Spuds (10-19-2020) |
10-20-2020, 12:01 PM | #9 | |
The Dictater
Join Date: Apr 2017
Drives: '13 Red Scion FRS
Location: MD, USA
Posts: 9,509
Thanks: 26,348
Thanked 12,529 Times in 6,205 Posts
Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Apparently the pump is inserted into the filter, so I have to disassemble that assembly then reassemble it with the new filter so it's not exactly a quick pull and replace. I suppose I can probably just buy the whole assembly. |
|
10-20-2020, 01:29 PM | #10 | |
Senior Member
Join Date: May 2020
Drives: 22 BRZ limited
Location: Clarksville TN
Posts: 1,198
Thanks: 219
Thanked 1,004 Times in 530 Posts
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
|
Quote:
That sucks! |
|
10-20-2020, 04:46 PM | #11 |
Senior Member
Join Date: Jan 2016
Drives: hyper blue
Location: east tn
Posts: 404
Thanks: 166
Thanked 262 Times in 156 Posts
Mentioned: 2 Post(s)
Tagged: 2 Thread(s)
|
i have the PDFs of the 06 service manual if you need a section.
|
The Following User Says Thank You to thomasmryan For This Useful Post: | Spuds (10-20-2020) |
10-20-2020, 05:22 PM | #12 |
The Dictater
Join Date: Apr 2017
Drives: '13 Red Scion FRS
Location: MD, USA
Posts: 9,509
Thanks: 26,348
Thanked 12,529 Times in 6,205 Posts
Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
|
|
10-21-2020, 04:46 PM | #13 | |
Senior Member
Join Date: Mar 2017
Drives: Q5 + BRZ + M796
Location: Santa Rosa, CA
Posts: 7,884
Thanks: 5,668
Thanked 5,806 Times in 3,300 Posts
Mentioned: 70 Post(s)
Tagged: 0 Thread(s)
|
Quote:
__________________
My Build | K24 Turbo Swap | *K24T BRZ SOLD*
|
|
The Following User Says Thank You to Irace86.2.0 For This Useful Post: | Spuds (10-21-2020) |
10-21-2020, 05:10 PM | #14 | |
The Dictater
Join Date: Apr 2017
Drives: '13 Red Scion FRS
Location: MD, USA
Posts: 9,509
Thanks: 26,348
Thanked 12,529 Times in 6,205 Posts
Mentioned: 87 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Also, I'm pretty sure I saw this happen before, but I could be mistaken as to the physical cause if it. |
|
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Troubleshooting a Leak with OFT | Lakitu | Software Tuning | 27 | 06-22-2018 02:31 AM |
Troubleshooting Idle | bfsnail | Forced Induction | 3 | 12-03-2016 05:05 PM |
BRZ DRL Troubleshooting | MaximaZero | Issues | Warranty | Recalls / TSB | 2 | 11-17-2015 03:31 AM |
Troubleshooting with a KW c38 | pgranberg11 | Forced Induction | 7 | 10-13-2015 07:05 AM |
Need troubleshooting help. | Camop82 | Scion FR-S / Toyota 86 GT86 General Forum | 6 | 10-14-2013 01:16 AM |