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Old 06-24-2010, 07:01 PM   #1 (permalink)
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Default 87 sammi 4wd problems

i have problem with 4wd in my sammi i lock it in 4low or high and trie to climb a hill or just got forward period and the sammi will die and is hard to start back any ideas on what it might be does the carb need adj or is the fuel pump bad? thanks
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Old 06-29-2010, 11:47 AM   #2 (permalink)
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does it work ok in 2wd?
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Old 06-29-2010, 02:52 PM   #3 (permalink)
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yea it runs fine after putting it back in 2wd just have to get it started back after it dies from being in 4wd
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Old 06-29-2010, 03:03 PM   #4 (permalink)
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I would have thought if it's an engine issue it would produce the same fault in both 2 and 4WD....does it move at all in 4WD?

If not I'd be inclined to think there's an issue in the mechanics of the 4WD system...you could test the transfer box by dropping off the front prop shaft (so we know no other part of the system is doing anything) and selecting 4WD, if it drives then we know the transfer box is OK and that we'll need to look at the front axle/diff for a fault.

Sorry I don't have an easy answer

Last edited by Desper; 06-29-2010 at 03:05 PM.
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Old 06-29-2010, 08:28 PM   #5 (permalink)
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when 4wd is in it will go but if you put it in a strain like climbing a hill of go on rough terrain it will lose all power and eventually die out its like it loses fuel or floods itself out and takes a few min to start back....thanks
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Old 06-30-2010, 05:03 AM   #6 (permalink)
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Default few more questions

Hi,

Have you tried the same hill in 2WD?

A few other questions....

What carb do you have on it?
Does it smoke or smell of petrol at idle?
What colour are the spark plugs? - A photo of that would be handy
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Old 06-30-2010, 10:41 AM   #7 (permalink)
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it sounds like your front end is bound up. As was mentioned It could be anything from the Transfer case to the wheel hubs. You need to start doing a diagnostic. Start by running it in 4WD with the hubs unlocked (make sure the wheels spin freely with the hubs unlocked) If it doesn't stall, then it's not the Transfer case. If it's not the transfer case you probably need to pull the front axel apart. The differential is the easiest place to start.
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Old 06-30-2010, 11:27 AM   #8 (permalink)
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Baratacus, welcome!

If the free wheeling hub's are in 'free' the 4WD system will drive both the transfer box and the diff/front axle, even though the wheels will be free to rotate. We won't have eliminated the transfer box or the diff, UJ's etc with this test, because there both still doing something?

Hence I suggested dropping the prop and only testing the transfer box (all other parts remain as they were).

It occurs to me as I write that, that if his free wheeling hubs are in 'lock' the only part of the system changing, as the fault is observed, is the transfer box, hence this is the most likely cause at this point.

No offence! Just wanting to get to the answer and learn something along the way.

Gotta pop out now for the evening (UK time), I'll check back later and see if you've both had some luck solving this one.

Take it easy.
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Old 06-30-2010, 02:56 PM   #9 (permalink)
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i just tried to go up the same hill in 2wd and it does the same thing as if it was in 4wd bogs down and dies and is hard to start back i have a weber carb on it and i smell exuast fumes because th emuffler is cut off right under the drivers seat but i can also smell pure gas....
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Old 06-30-2010, 03:15 PM   #10 (permalink)
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Well, that eliminates the drive train as an issue!
Progress!!!

Ok, now back to the carb...the smell of fuel would indicate an over rich mixture. We can confirm that with co meter or colour tune, but the easiest and cheapest way is too look at the spark plug colour.

Dark black spark plugs are conformation of over rich mixture...have a look.
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