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I have a 2004 Tracker LT 2.5 eng. 75000 miles and used only synthetic oil.
When I went to crank my car it seem to fire once. I tried again and it had a different sound like no compression. I continued to try a few times. I did a compression check and here is the results. #1- 60, #2-80, #3-70, #4-50, #5-50, #6-75.
After checking different forums I felt it had jumped a tooth and had problem in the timing train. I have opened up the eng. and looked at the chain. All seems ok but there is some slack in the chain at the center gear (maybe Idler gear). I moved the crank about a 1/8 turn and the slack tightens up and the #1 tensioner moves out to tighten the chain. I can push on the tensioner and it will move back in about 1/8". I can push it back and forth.
I lined up the crank key with oil jet and #1 on TDC and the timing marks are off about one tooth.
I will try to attach some pictures.
 

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I have opened up the eng. and looked at the chain. All seems ok but there is some slack in the chain at the center gear (maybe Idler gear).
You need to make sure that the cams are in time.

See...
https://www.mediafire.com/folder/4mq34c2t2jroq/Valve_Timing

And...
http://www.suzuki-forums.com/1g-1999-2005-vitara-grand-vitara/15365-h25-h27-v-6-timing-chains.html

Assuming that you know the correct procedure to acquire compression readings (ask us if unsure), those across the board numbers suggest valve timing probs. :(
 
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