I have a 1999 Saturn that has a hard start issue..It will start only when holding the gas pedal to the floor and turning it over and over. once it does start it will idle and run fine..I have replaced the plugs and the pcv valve and need some advice before I start the process of elimination..Please Help
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For 90% of cars that try but just can't start. Key off, Pump Gas Pedal 4 x, holding it to floor (all the way down) on 4th time, then just turn key. as soon as engine starts and revvs up, let go of the gas pedal! Seriously... Do not keep the pedal down!!! This is b/c engine is 'cold', the oil that lubricates your precious engine is very thick, and you don't want to add other problems (scarred pistons/cylinders/rings and oil burning or a severely overrevved engine (screaming) at no load (you are not in gear - no drag of car weight on motor) resulting in major engine damage.
Try this-- The next time you start the car, hold the pedal down to the floor. If it starts, Then you have a flooding problem. hold it there for 30 seconds. Then while still holding the pedal to the floor, try to start the car. Hard to say on pc. If above does not work, see or call saturn dealer to see if anyone else is having the same problem. Good-Day!
Holding the pedal to floor should not do anything because the car is fuel injected... You may check your fuel filter.. it sounds like its taking along time for fuel to start engine... The fuel filter is located on the cross member just forward of the fuel tank....
leaking o-rings at the fuel injectors would explain the hard starting when warm-when you hold the petal to the floor, it shuts off the injectors, which will make it possible to start it after the injectors leak down on shutdown. O-rings are easy to replace, just disconnect the battery and pull the injectors straight up to remove, get the old rings out and install the new ones, light lubricate the base of the injectors and pop them back in.
that might explain the high idle too, although usually the idle is not consistent when the injectors are leaking at idle-idle is rough. I would make sure the engine coolant temperature sensor is new (they are very important on saturn, the original one is plastic and they are known to crack easily-the replacement should be brass)-also, check the Idle air controller, best to remove the throttle body (4 bolts) and remove the IAC and clean it thoroughly, being careful not to get the top half wet-sensitive electronics. Clean the post that the IAC goes into, and clean the throttle body (both sides) while you have it out.
try cranking engine while holding gas pedal to the floor, this turns off the fuel injectors to clear excess fuel from cyls. eng my just be flooded. may need to crank for a long time. if engine starts do not let off gas until you are sure eng will run on its own.
fuel, oxygen, and spark. Check all of these. Is it getting air. Is your filter clean. Are you getting spark. if not check your plugs wires and coil. finaly check your fuel. Are you getting enough fuel. Replace the filter, make sure you are getting enough psi's before the injectors. also make sure the fuel pump is working.
You will probably need to put your car on a computer scanner.