The Toyota Landcruiser Owners Club

Towpack · Posted: Tue Oct 11, 2005 20:20 Post subject: Intermittent Diesel Misfire????

Not sure if this is a fault or not but just occasionally I'm noticing a slight hesitation on pickup from idle when the engine is revved.The best way I can describe it is if it was a petrol engine one of the cylinders was misfiring,due to a bad spark plug or HT lead.The idle speed is steady and once under way it pulls as normal.First noticed it a couple of weeks ago.Not sure what to check on a diesel and the fact it's intermittent doesn't help.Any diesel tech heads out there?Advice appreciated.
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Phil

1998 HDJ80 Amazon VX 4.2TD
2004 Yamaha R1 (Sold)
2011 Ducati 1198SP (Sold)
2012 kawasaki ZZr1400
2002 Honda XR650R (BRP)- STOLEN GRRRRR!!!
2010 Husaberg FE570....YIPPEEEEE!!!!
2003 GT XCR3000
1995 Border Collie-Passed away 23-5-2011

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Grimbo · Posted: Wed Oct 12, 2005 23:10 Post subject:

hi, how many miles have your injectors done ? could be a dodgy injector, think i'm right in saying that they work on a dual phase principle, in that initial crack off pressure is lower than main injection pressure. If this is the case, then it is possible to have a low speed 'misfire' that won't show up when accelerating or using higher revs. First try strong dose of a proffesional injector cleaner, then next thing is injectors out, and get them checked by a diesle specalist. You can try, with engine ticking over, undoing 1 injector pipe at a time, listen for the one that makes little or no difference to the engine, then treat that as no 1 susspect. (this only really works if 1 injector is fairly knackerd) Hope this helps. Ps Automarine diesels in Brighton are good. Smile

Towpack · Posted: Wed Oct 12, 2005 23:21 Post subject:

Thanks for the reply.
They've only done 52k,not a big milaege really considering what they can do.You mention 'Professional' injector cleaner.Any particular brand?I've seen the Redex and Wynnes stuff in the shops but not used it.

Cheers
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Phil

1998 HDJ80 Amazon VX 4.2TD
2004 Yamaha R1 (Sold)
2011 Ducati 1198SP (Sold)
2012 kawasaki ZZr1400
2002 Honda XR650R (BRP)- STOLEN GRRRRR!!!
2010 Husaberg FE570....YIPPEEEEE!!!!
2003 GT XCR3000
1995 Border Collie-Passed away 23-5-2011

lucky · Posted: Thu Oct 13, 2005 9:05 Post subject:

Redex and Wynns are good, so is 10K Diesel (I think it's called something like that).

Alternatives are oil fouling of the injectors due to a bad oil control piston ring, or low compression.

Try the Injector cleaner first. I also got a new set of injector nozzels for mine from Germany for £120 the set off e bay.
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1999 Land Cruiser Amazon VX Active 4.2TD Auto
Gloucestershire 4x4 Response
Landcruiser-rocks

Plug · ** Joined: 08 Oct 2004 Posts: 68 Location: Plymouth

Try giving it an Italian tuneup.(when warmed up thrash the hell out of the engine).
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BIODIESEL..Veg My Ride

jvoelcker · Posted: Mon Oct 31, 2005 0:59 Post subject:

Check the fuel and air filters these can cause similar problems.

Also check the tank after a longish run - if you get a lot of air being sucked in to the cap it could be a blocked breather pipe or the breather valve in the cap sticking.
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Cheers,

Julian
1994 HDJ80, with loads of mods without looking too obscene Smile

1997 KZJ95 - Gilly's - plain black and muddy on BFG ATs.