I HAVE A 1999 CHEVY TRACKER 2.0 4X4 MANUAL TRANSMISSION. SOMETIMES IT STARTS AND RUNS GREAT OTHER TIMES YOU CAN CRANK IT OVER FOR 20 MINUTES AND IT WON'T START! CHECKED FUEL AND SPARK. FUELS GREAT SPARK IS THERE BUT LIGHT. WHEN IT WON'T START. THERES A WEIRD CLICKING SOUND COMING FOR RELAY UNDER DASH I CHANGED IT BUT STILL CLICKS. I HAVE ALSO SCANNED IT AND THE IS NO CODES PLEASE HELP!

STARTER DEAD MEANS NO CRANK????????????
CRANKS FAST BUT DOES NOT START, MEANS JUST THAT.?
OR cranks then STARTS AND STALLS.?
I CAN NOT UNDERSTAND THE END OF LINE 3 ABOVE.
WE CAN NOT HEAR YOUR STARTER SPIN FAST, YOU MUST SAY IT AND TYPE IT. OK.
THE IDLE CONTROLS ARE FAILING (IAC VALVE)
OR you never got tune up in 20 years? and the spark plugs are shot.
as expected 100% that.
IF BY CHANCES IT DOES CRANK FAST AND WILL NOT START
UsE 5% right foot throttle to start the engine,

if the starter is dead, shift to neutral and crank that way
the users guide (free) tells how.

a starter can be dead silent
or clicks
or chatters
or goes GRRRRRRGVRRRRRR that load cranking sound.
what does your starter do in line 3 , hot started.

You must check the fault codes first.

Go to Autozone or one of them and get the trouble codes read. Probably something there, maybe a crank or cam position sensor code, or also could be something in the ignition system like a bad coil or the ignition control module. The ICM controls the ignition coils' circuit, both of these two items can go bad and then fail when warmed up. Backfiring, shaking, and coughing kinda sounds like a bad crank sensor, but that's just a guess. Check for trouble codes first.

might be out of time,or exhaust clogded up,could be a lot of things thats two you could have checked out. rodger....

The next time it does not start have someone crank it over while you tap on the mass air flow sensor,if starts then remove the mass air flow sensor and clean the small wires inside of it using a non-chlronated brake cleaner let dry 10 minutes then re-install.

Iwould check the fuel filter first thing it kind of sounds fuel related with the uphill power loss . the next thing to check would be the catayltic convertor with it running seewhat kind of exhuest flow is comeing out the tail pipe. But i think its more then likely its fuel related if it were the cat you wouldn't be getting mass air flow codes Do the fuel filter and when you have it off check to see what the fuel pump is putting out you should stick a plastic bottle on the end of the fuel line and crank the engine for 5 seconds it should fill it about a 1/3 give or take this is a 20 oz size bottle if its close its ok if its far less then its the pump However sometimes the pump will work fine one munite then stop then come back . Well i can't say for sure that this is the problem but it can't hurt to replace the fuel filter and check the pump hope this helps some

Since you've handled the usual suspects, I'd suspect the coil and/or power transistor in the distributor.

Sounds like a bad countershaft bearing. The trans will need removed and disassembled to fix it.

synthetic SAE 75W-90 GL-4 GEAR OIL

Check first your crank sensor.
Make scanner for engine and transmission.
Check your air filter.
Check fuel filter