Reply With QuoteI wonder if it may be a fuel starvation problem
A miss/hesitation under load in 4th can occur if the lift pump filter is partly blocked .
Worth checking if you haven't already done so
Master
So I've just completed a 900km journey through some rough mountain passes in snow country.
I notice a few new squeeks and rattles to find, but more worrying is the reverberation in 4th gear under load.
It feels alot like im missing on one cylinder but only ocurrs in 4th gear under load.
I'm concerned it may be a shot bearing sonewhere. I also note a faint whirribg sound when in between gears downshifting.
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AT REST
I wonder if it may be a fuel starvation problem
A miss/hesitation under load in 4th can occur if the lift pump filter is partly blocked .
Worth checking if you haven't already done so
AT REST
Have a read of this thread
http://www.aulro.com/afvb/isuzu-land...pump-died.html
Post #26 shows the offending item and gives some guidance for dealing with it.
Master
Fuel filter changed immediately before trip - sedimenter drained before trip. Banjo fittings checked for filters - none found.Originally Posted by 87County
But I did notice it began to lack power on the return trip a little.
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AT REST
Sounds to me like you may not have checked the filter I am referring to?
The filter I am talking about is more a strainer and is hidden under the lift pump - rarely gets checked (see photo referred to above)
Master
Fuel starvation is a good probability given what i've read.
Picked up fuel in inknown locations and done rough roads, and on my last quarter tank.
All recipies for picking up crap from the tank.
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Master
I'm just looking up images of the lift pump to find out what/where that is.
Do you mean the hand primer on the side of the injection pump?
Or is this a separate entity in the tank area?
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AT REST
refer to link in post #3 above - as I wrote, post #26 in the linked thread gives a full description of what to do
Master
Will do
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Master
That little filter is a PITA to find and get out.
Directly under the hand pump is the banjo bolt in question that you need to remove.
You need a bent, short handled wrench, or take off the fuel line next to it so you have room to work.
Be careful, there is a little washer in there that is easy to miss when you take it off if it gets stuck on the housing. The filter itself is tiny, less than 8mm across by less than 20mm high. Really, really small.
If your problem was fuel starvation, I would have thought you would have experienced it when accelerating? Or does it not work that way?
Have you driven it heavy before? 4 th gear I've found is good if you're up to speed, but if you're loaded and hit an uphill grade, it really shows up the engines lack of power (60 odd kw is not much in a ~ 3 ton vehicle once you add fuel, passengers and gear)
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