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jim junkie Profile
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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
28/Mar/2021, 7:27 am Link to this post Send Email PM   Send Private Message Blog
 
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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 emoticon
28/Mar/2021, 12:53 pm Link to this post Send Email PM   Send Private Message Blog
 
Nickelass Profile
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Date Registered: 02-2021
TOTAL POSTS: 70
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Re: T31 Petrol engine issues


Glad to hear you sorted it!

---
Nick
2010 ST (MY10). ** MODIFIED*** King lifted springs, Rear protection tray, Sony XAV-AX1000 headunit, CMD05 Command parking sensors, Garnish Mount reversing camera, Tow bar, Left side cargo drawer, ClicOn dash mobile mount
29/Mar/2021, 6:56 pm Link to this post Send Email PM   Send Private Message Blog
 
jim junkie Profile
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Date Registered: 03-2021
TOTAL POSTS: 4
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Re: T31 Petrol engine issues


Well, turns out I was a little premature in my celebration, the issue came back again 70km later.

I checked the OBD2 readout and got miss-fire on 3 of the 4 cylinders, all but the one I replaced the coil pack on. I refused to believe that all 4 would die simulatenously and didn't want to be another $750 on it, so sent it off to the mechanic. By this time I was thinking fuel system problem which I wasn't kitted out to diagnose or repair anyway.

Turns out it actually was the remaining 3 coil packs. There's visible burn marks on each where it's burnt through the plastic end (just behind the rubber tip) and shorted out to the cylinder head.

The most likely reason I got it going for another 70km is that I had cleaned all the tips with IPA, removing any carburisation through the burnt path & reducing its conductivity. Just enough to get it going again for a bit.

At least the problem is solved now. 2 tanks of premium later and it's still going fine.

Now all I have to deal with is the ruined rear end from getting rear ended 3 days later. Wrecked door, surrounding panels and latch from a ding in the frame behind the door too. It seems I just can't win at the moment.
14/Apr/2021, 11:02 am Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6002
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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**
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14/Apr/2021, 11:55 am Link to this post Send Email PM   Send Private Message Blog
 


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