drownding

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Guest
Hi guys
I have had that problem for a while and want to ask if some of you
know about it and what someone should do about it.
It happens usually when I just start the engine,then I put it in a
gear and try to accelerate but instead off i have some kind of
drowning the engine-almost dying but after the turbo connects it
looks better... The filters are changed. Had the feeling that too
much fuel is coming but why?
Sorry for my poor english-hope you 'll understand me :)
Lubo
96HDJ80
 
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Hi Lubo,
Are you saying that the engine revs drop when you try to accelerate or
that you have no power until the turbo kicks in?
Have you checked the air and fuel filters?
Also, does it only happen when the engine is cold or also when warm?
After you have been on a long drive and then you open the fuel filler
cap, do you get a sucking noise?
If it only happens on initial start when cold, it could be something to
do with the fuelling like their may be air getting into the fuel system
resulting in the starting OK on the fuel in the pump and possibly the
filter but then the engine needs to suck up the fuel from the tank and
the air in the pipes which will cause the engine revs to drop/loss of
power until the air gets sucked through.
If you suspect this, use the pump on the top of the fuel filter and
pump it to prime/bleed the fuel system before starting and check to see
if that makes a difference.
Whilst you are then, double check that the fuel filter is on properly -
it is unlikely to be leaking fuel (unless the bit on the bottom isn't
on properly, but the seal around the top may be sweating fuel - it
should be dry.
The situation can be made worse by a blocked bleed system in the tank -
when you stop to refuel you may get a sucking noise from the tank as
you open the cap - this is caused by the valve in the cap being blocked
or the tank bleed pipe being blocked.
I hope some of the above will get you on your way to resolving it.
--
Regards,
Julian Voelcker
Mobile: 07971 540362
Skype: julianvoelcker
Cirencester, United Kingdom
1994 HDJ80, 2.5" OME Lift
 
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On Jun 22, 2006, at 12:00 AM, Julian Voelcker wrote:
> Are you saying that the engine revs drop when you try to accelerate or
> that you have no power until the turbo kicks in?
>
> Have you checked the air and fuel filters?
>
> Also, does it only happen when the engine is cold or also when warm?
>
> After you have been on a long drive and then you open the fuel filler
> cap, do you get a sucking noise?
Hi Julian and many thanks for the answer!!!!!
it seems like the engine is kind of 'dull' until the turbo kicks in-
it always've been like this and that's why i changed the fuel filter
(diesel filter) at Toyota.
I had similar problem with my old LC LJ73 and then that problem was
over when changing the fuel filter.
That only happens when the engine is cold ant only at the beginning
the first few meters-actually when i try to accelerate. Yesterday
even came some yellow light on the dashboard when that occurred and
almost had the motor stop.
Yes-when I refueled and open the cap I hear that sucking noise but
never thought it was important...
cheers
Lubo
HDJ80 96mod
 
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Guest

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Hi Lubo,
OK, the first thing to do is to sort out the tank breathers.
Take the cap off and if you look at it you should see that it pulls apart (Carefully!!!!) I think there is even a spring in there that comes flying out. Strip it down and clean all the parts with something to remove and fuel residue and then spray any moving parts with some silicone based spray - like the sort of spray used for dashboard, etc. This will act as a lubricant and also slow down the build up of further dust and grime.
Next, there is a pipe that runs from the top of the tank backwards towards the rear axle - initially it is metal but then it changes to rubber and there is an inline filter (a bit like an inline fuel filter). This pipe ends up in the chassis rail that runs across above the rear axle which quite often ends uo with a build up of mud and dust blocking the pipe. Pull the pipe out of the chassis rail, disconnect from the filter and blow it through to make sure it isn't blocked. Also check the filter to see if it needs replacing.
Try those and then report back.
Another thing to look at is the LCOOL site at http://www.lcool.org Follow the links to 80 series technical and look for info on pump tweaks - the 24 valve is notorious for lacking power at low revs, unlike the 12 valve - the pump tweaks resolve the balance.
Good Luck,
Cheers,
Julian
 
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Guest

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Hi Lubo,
The symtoms also sound like a mild case of fuel starvation as the
injection pumps wears the ability to suck up fuel from the tank also
decreases. The vane pump in the front of the injection pump, whose job
is to suck up fuel and feed it onto at a correct pressure relative to
engine rpm, uses centrigual force to throw the vanes out to seal against
the housing and as thet wear they don't pump as efficiently especially
at idle as the pump rpm is lowest. You can fix this by rebuilding the
injection pump or just add a walbro pusher pump to supply a sterady
supply of fuel at low pressure to the inlet of the pump as it was
intended to run when bosch designed the VE injection pump. A side
benefit is the engine will alway's runs smother and generally use the
same or less fuel as well (less because the advance curve tends to be
correct when gently forced fed and retarded to various degrees when not).
Any one who wants it I can email a mounting template sketch for a Walbro
6065W 12V 10 psi (that is a nominal rating actual delivered pressure is
alway's lower than this) to fit the 80. All my vehicles I have had with
VE pumps have alway's been run with them.
Cheers,
Craig.
 
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On 6/23/06, Craig Vincent <[Email address removed]> wrote:
Craig,
IMHO at the initial stage the lift pump draws fuel from the fuel
filter, not the tank.
I think we'd need a little more inpuit from Lubo, like idle revs at
cold start (cold start advance mechanism - I'm sure they have thm in
N), exhaust gas colour, condition of the air filter and duct, and of
course suction in the fuel lines, as Julian said, The latter, however,
should manifest itself not only at low revs before the turbo kicks in.
--
Rgds,
Roman (London, UK)
'92 HDJ80
 
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