jim junkie
X-TRAIL NEWBIE
Date Registered: 03-2021
TOTAL POSTS: 4
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T31 Petrol engine issues
Hi all,
First time poster here, but of bit of a lurker for a while now & get the impression you are the right people to ask about this issue I've been having.
My 2009 T31 Petrol (QR25DE, 180,000) suddenly lost power mid-drive the other day, misfiring badly but able to limp home. On the limp home, the behaviour was generally a rough idle with misfires and pretty gutless under load. Occassionally, the issue would resolve for 1-2 seconds and full power would return.
Becuase of the fast on / off nature of the issue, I suspected electrical, possibly a coil pack. Plugging in the OBD2 I got a P0300 and P0302, so I started there. I pulled the coil packs on each 1 by 1 to see if it affected anything, but nothing. Move the #2 pack to #1, and no change. Plugs are also pretty new too (20,000km), and I did try switching out #2 to no effect.
I thought it may be crank angle / camshaft angle sensors & the P302 a bit of a red herring, as it didn't return with a clear of codes, just P0300. So I went and replaced the camshaft & crankshaft sensors. No change.
P0301 returns, so I suspect I've just misdiagnosed the coil packs. Replace coil pack on #1.
BAM, problem solved. It runs like a dream, for about 5min. I get halfway around the block with full power & not a miss, then the problem comes back with a vengance.
It runs pretty well under no load, i.e. you can get it up to 3-4k RPM no problem,idle is still pretty rough though. As soon as you apply any load it's totally gutless.
I'm thinking it all points to a fuel issue? Low fuel pressure or blocked filter? Wouldn't this throw an error code though? I'll clean off the MAF today & give the wiring a once over, but there was nothing suspicious there yesterday and I'm at a bit of a loss for this one.
Cheers,
James
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28/Mar/2021, 7:27 am
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jim junkie
X-TRAIL NEWBIE
Date Registered: 03-2021
TOTAL POSTS: 4
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Re: T31 Petrol engine issues
Well, for future reference, this one is now resolved.
I'd run it for 10-15min last night after putting a bottle of injector cleaner through, as by that point I was fresh out of ideas and figured what the hell. There was no improvement then, so I slept on it.
Cleaned off the MAF sensor this morning and all the spark plug coils connections and gave it a whirl. After a few sputters initially, it caught and went fairly well for a bit. I let it warm up and gave it a few checks under load, with one or 2 going very stuttery but eventually the whole lot consistently worked.
I've since topped it up with some premium & put a bottle of fuel system cleaner in for good measure and taken it for a 40km run down the freeway with no issues. Fuel economy is back where it should be at aroun 7.1L/100km on the freeway (no AC).
So I'll count that as a win. Given the behaviour, i'd still think the root cause was electrical, most likely the coil pack given the behaviour after replacing that. It was probably a case of running it rough for a while that didn't do the injectors any favours, so needed a bit of a clean afterwards.
Anyway, it's running again, so I count that as a success
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28/Mar/2021, 12:53 pm
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: T31 Petrol engine issues
One reason for coil packs blowing can be from a bad earth so check all your earthing points to make sure they are clean and secure with no corrosion under the lug to the base metal.
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
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14/Apr/2021, 11:55 am
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TopGun65
X-TRAIL ENTHUSIAST
Date Registered: 07-2015
TOTAL POSTS: 208
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Re: T31 Petrol engine issues
My Xtrails engine started misfiring all of a sudden recently, with a huge loss of power and the MIL was flashing. When I checked the codes, it had P0300 and P0301 on the reader. I cleared the codes and swapped number 1 and 2 coil packs around and then started the engine and code P0302 came up. That meant cylinder number 1 coil pack had failed, which was now on cylinder number 2.
Rather than wait and have them fail one by one, possibly out in the middle of nowhere (like my fuel pump did at 100,000k's) and seeing the car has travelled 225,000k's, I renewed all 4 coil packs. I also renewed the sparkplugs as they were due to be changed anyway, even though they looked perfect upon removal.
I cleared the codes and started the engine and took it for a drive and honestly, its running like a brand new engine. The gearbox is no longer high revving going up hills, trying to work out where it should be. The revs are much lower going uphill and the gearbox is so much more precise, and I can really feel the increase in power. Also the fuel consumption has improved going from 11.5 L down to 10.5 L/100k.
I'll keep one of the good coil packs that I changed in the rear tray as a spare. I'll also check the earth points in that area as Kev mentioned to eliminate that as a cause of the failure.
Not sure if different brand coils make a difference, but the ones I purchased are "Goss" P/N C589.
--- Eric
X-4282 (c)
Glen Alpine, Sydney
2010 T31 Cvt STL
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9/Sep/2022, 7:15 pm
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