Red33Z28

Had a no start condition yesterday afternoon. Happened on lunch and I thought I was going to be later back to work. Cranks but won't start. I just sat there for a couple of minutes and tried again for about 5 seconds, let off and immediately got back on it and it started. Got to work and shut it off. It sat for about 4 hours. I went to leave work and it wouldn't start. I could smell a **** load of fuel while trying to start it. Whipped the scanner out and checked over the info it was reading with the key on. Desired RPM was 3,781 RPM....so the fuel I was smelling was most likely flooding the car.

So, what inputs determine the "Desired RPM"? I know coolant temp is one.

Tinbender59

water temp is not as large as you would think. the two largest contributors are the TPS, and MAP. plug your scanner in, watch the TPS while slowly stepping on the accelerator pedal and letting off slowly a few times. check all of your sensors land make sure they are all with in specs. ????

96capricemgr

iTrader: (1)

I never bothered to look at desired rpm with the key on engine off. Since the pcm is not getting running feedback from the sensors I would not expect that number to mean a lot.

If you get it to start and it begins to command something crazy like that then worry.

shbox

You will always see the desired RPM way up there before you start the car. That is nothing to be concerned about. The temp sensor is important. That is why you see people with fueling problems when the temp sensor is reporting continually low temps and causing it to run rich. However, it does not take much cranking without starting to flood an LT1 in my experience.

FAD2BLK93

If u think its flooded, push the pedal to the floor. Or pull the plugs and clean them up.

quik95lt1

iTrader: (7)

thats always been a gm thing with the key on and the car not running....the desired rpm goes to 3xxx rpm......no worries.....sounds like u may have an ignition issue however

Red33Z28

I'm hoping and praying it's the ICM/Coil combo. I ordered an AC Delco ICM and a MSD coil....We'll see if my problems get cleared up after I r2 those.

DisasterFormula

iTrader: (1)

Be warned, the MSD Coils tend to kill weak Optis from what experiences I've read about on here.

Bigtoyz

iTrader: (2)

I would stay away from aftermaket coils like disaster said. They eat up Gm opti's........the matierial they use doesnt take the extra voltage they put out and will arc across the circuts and also eat up the rotor. I did msd coil and opti didnt last 10k miles and went out. I dont think NA motor really needs that kind of a coil unless you have some wild motor.