Isuzu Trooper Owners Club UK™

gary820 · Posted: Wed May 07, 2008 21:52 Post subject: any ideas?

Right anyone got any other ideas on this one.....
my 3.1 from cold, starts revs up to about 2000rpm and cuts out, start for the second time revs to about 1200 rpm and cuts out, third go it starts, catch it on the pedal and she'll idle fluctuates a bit, drive down road trys cut out on idle, warm up for 5 mins and all is well! oh doesn't do every cold start!!!!
all new fuel lines and tank, pump replaced due to non start problem (timed up by the book), no air in fuel system (clear filter in there while checking), no faults with injectors, not leaking etc (been tested all ok) glow plugs all working ok. engine is mechanically sound.
Cold start switch isn't connected and system disabled, whats the purpose of the valve on the fuel pump with the coolant hoses, i'm guessing it's to do with cold starting?
so anyone got any other ideas as i've given up with the thing now and think i've checked everything!!!!......
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landcruiser 80 series 4.5, 35's/33's for road, 2inch lift, discreet winch, sliders/armour, factory lockers, stainless side exit +++++

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markymoan · Posted: Wed May 07, 2008 22:05 Post subject:

All I can think of is the pump, and it not working proper till warm,, you say you tested the injectors ?
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dxmedia · Posted: Wed May 07, 2008 22:06 Post subject:

I had a problem with the MU where it would only be running on 2 for about the first 30 secs (foot flat to the floor) until it caught then would be on 4 fine...

I don't know what the issue was, but ripping out all of the vaucme pipes (I mean all apart from the main pipe from alternator to servo, and blocking the little one off the vacume pump) and only having the pressure pipe from the intercooler to the fuel pump solved no end of problems, starts perfectly on cold, warms up fine, no issues at all.

There's no going back if you do this since there is about 50 small bits of pipe which can all only go on one way, but you don't actually need any of them if you don't mind a spot of white smoke on start for 30 seconds.
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gary820 · Posted: Wed May 07, 2008 22:17 Post subject:

pump came off an engine that had no running problems at all just a bent body! i'll go for the bin vac pipes and try again, injectors have all been removed and tested (by a diesel specialist), may as well get some silicone stuff while bonnet up to go from intercooler.
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landcruiser 80 series 4.5, 35's/33's for road, 2inch lift, discreet winch, sliders/armour, factory lockers, stainless side exit +++++

dxmedia · Posted: Wed May 07, 2008 22:19 Post subject:

Can't think what else unless you've a problem with the glows? How did you test them?
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wv6z · Posted: Wed May 07, 2008 22:19 Post subject:

dxmedia · Posted: Wed May 07, 2008 22:25 Post subject:

Vacume pump - a pump on the back of an alternator of a diesel, can't pull from the manifold like a petrol engine. Vacume pipe - small 10mm pipes which go all over the engine bay on the 2.8 and 3.1 (and I belive also on the 3.0). The control the quick warm up, cold on start, egr's, and fuel boost on start I belive. The pressure feed from the intercooler opens up the fuel pump for on boost fuelling from the turbo.
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markymoan · Posted: Wed May 07, 2008 22:30 Post subject:

I would start again and recheck the timing etc, its easy to be a tooth out.
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dxmedia · Posted: Wed May 07, 2008 22:32 Post subject:

gary820 · Posted: Wed May 07, 2008 22:36 Post subject:

glow plugs are new anyway oddly just before langdale!! Shocked

that place is cursed! like i say it's weird as won't do it every cold start, prob why it's getting annoying! i'll dump the vac pipes and see what happens with it. going away sunday so not much chance to do much as other jobs on! either that just keep it warm!!!!!!!!!!!!!!!
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landcruiser 80 series 4.5, 35's/33's for road, 2inch lift, discreet winch, sliders/armour, factory lockers, stainless side exit +++++

wv6z · Posted: Wed May 07, 2008 22:38 Post subject:

gary820 · Posted: Wed May 07, 2008 22:42 Post subject:

dxmedia · Posted: Wed May 07, 2008 22:42 Post subject:

As I say I'm not entirly sure how all the system works - I pulled it out due to a problem with the brakes, and a knock on effect is better cold running... means that something was broken, I just don't know what.
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gary820 · Posted: Wed May 07, 2008 22:53 Post subject:

well egr's not there, quick warm up rubbish not plugged in so it's worth a try! i'm trying view it as teething problems as that thin ice is getting thinner Shocked

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landcruiser 80 series 4.5, 35's/33's for road, 2inch lift, discreet winch, sliders/armour, factory lockers, stainless side exit +++++

gary820 · Posted: Fri May 09, 2008 21:55 Post subject:

right binned the vac stuff, all was good yesterday and this morning.... thought great it's sorted then after work had the same only revved upto 3000 rpm this time then sat at a very un steady idle for 5 mins till warm then runs great! any more ideas? i'm going away for a week on sunday so be next weekend when get chance do anything to it now,
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landcruiser 80 series 4.5, 35's/33's for road, 2inch lift, discreet winch, sliders/armour, factory lockers, stainless side exit +++++