itwontstart has feul good sparkcompression good new fuel filter. plugs good points good /?????

I vaguely remember something about an issue with some of the L cars where the PCM would get caught in some type of logic loop that actually caused an indefinite "no-start" condition. Saturn dealership would be able to tell you if your car (give them the VIN) was affected by this. I think they have to reprogram your PCM to fix it.

Aside from that longshot:

1) What were you doing when it stopped running? Were you driving it or did you come out one AM and it just won't start?

2) Have you scanned for codes? Is the SES light on? Borrow a scan tool from an Autozone or similar and post the results.

3) Does it fire on any of the cylinders but not run, or does the engine just rotate with no attempt at combustion?

4) Did you check all coil packs -- not just one of them?

5) What engine? 4 or 6 Cyl?

Derf

i went to my job and turned it off and after that it didnt start i havent done a scan....ses light is on...fires on all 4 ...and did all 4 coils...and 4 cyl.

it does fire on all pluges i tested them!

Post the scan codes and we'll take it from there....

Derf

there's only one it say's syestem too rich (bank 1) ---P0172

P0172 -- Fuel Trim System Rich Bank 1

PCM thinks air fuel mix is too rich (or...it may actually be the case)

0) Air filter? Engine may actually be starving for air...

1) Mass airflow sensor (MAF) -- faulty mass airflow sensor will often throw this code if dirty/faulty (cannot correctly sense the airflow)

2) Fuel system pressure/fuel system regulator -- if the fuel system
pressure is too high, you may be dumping too much fuel when the
injectors are open. Check the fuel presure regulator up by the fuel
rail.

3) Faulty Injector(s) -- possible you have injector(s) sticking open, dumping too much fuel

4) Vacuum leaks -- vacuum leaks, especially on the intake, pull in additional air. This makes the mix too lean, and may cause the PCM to compensate by adding more fuel to the mix....spray some carb cleaner around the intake manifold and throttle body -- if the rpms go up, you've found your leak

5) Bad 02 sensor (in front of cat) -- though I've seen many posts where
people replace this, the code goes away for 200 mi, then comes right
back (means it tweaked the system enough to avoid the code but was not
the root of the problem)
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OttJoe, you still out there....??
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Keep us posted -- good luck.

Derf

where are these sencors located and how would i check them?

how do i find these sensrs id think i need a flow chart?

how would i fix a fuel inj. stuck open?