1991 Saturn SL2 Engine will not start

When u replaced the computer did u have it programed?If so try holding the gas pedal all the way to floor while ur cranking it if it starts keep holding the ur foot to the floor see if it clear out some. Let me know what u find.

i thought u replaced the computer with a brand new one thats why i asked if u reprogramed it.have u checked to see how much fuel pressure it has with a fuel pressure gauge?i also suggested u try holding the gas pedal all the way to floor while ur cranking it if it starts keep holding ur foot to the floor see if it clears out some.did u try that yet?i posted a diagram of where the coolant temp sensor is also its the second one down with two wires going to it.they go bad cause no starts flooding when trying start over heating surging bucking all kinds of stuff.u could try replacing that there only like 10 becareful u will loose coolant if u replace it make sure u get a brass tipped one the plastic tipped ones crack.also check the connector they get corroded and turn green.if its corroded then u will have to replace the connector.let me know what u find.

What was the fuel pressure u found when u checked it?What did u find with the bottom coolant temp sensor did u see if it read within 10 degrees on the computer from what the temp was at the bottle that's what spec is?Did u replace it?Was the connector corroded like green?This is the bottom one with two wires th only one iam concerned about for starting. Get a niod light plug it into each injector connector crank it see if the light flashes. Check the compression of each cylinder. Then check the cam timming. If u need any directions or diagrams on how to do any of this let me know.I need to know what u found in detail when I ask u to do something because Iam not there to see what happened or what results u found. Did u try holding ur gas pedal to the floor to see if it started?Let me know.

if u think its the injector pluse i posted the injector circuit tests tells u how to test the injector pluse circuit just get a gm multi port noid light that will fit the saturns.we can atleast rule out the injector pluse or find that it is the lack of the pluse.let me know what u find.

I dont think its related to ur fuel cleaner. Its hard to say if ur fuel filter being clogged though usually when they clog they still run but they run poorly.U should change it every 30,000 miles for maintance. Ur coolant temp sensor reading within 2 degrees within ur iat is good for now but not a good way to test it. The best way to test it is when ur car is running letting it warm up and make sure ur computer reads within 10 degrees of ur coolant temp untill the fan comes on. But thats not a opion untill u get it runnung. So u have spark how did u test for it?The best way is to take off two wires off the coil packs right next to each and and have someone crank it over see if it sparks from tower to tower. Then put them back on and take the other two off and test those to make sure both coils are working. Also have u checked to see if the wires are on correctly?Iam posting a spark plug wire diagram dont pay attenion to the firing order that will confuse u.U will see the engine block with the cylinder numbers labeled thats drawn as ur looking at the engine from under the hood. Now the little drawing attached to the engine thats ur coils and u can see there labeled 4 1 2 3 thats the cylinder numbers they match up basicially connect the dots from ur coils to ur spark plugs. See if all that is correct. If thats all good then we will have to wait for the noid light test see if they falsh while ur trying to start the vechile and none of them stay on constant or the engine will flood. Then ur compression test and checking cam timming. Let me know what u find.

Your mechanic is tired of my thought's lol that's fine with me.I emailed you a wire diagram for your pcm to your personal email. Good luck to you and your mechanic.

If you have spark and your injector pluse's when you try to start it then a bad ground to pcm doesn't make sense. Have you tried to read the code's in the pcm if you can then the ground's good. Give that a try and see if there is any code's if there is give the number's of them to me. Also I asked if you would check the compression if you did what were the reading's for each cylinder?I also asked you to check the cam timming did you if so was every thing lined up correctly?If you spray carb in the throttle body will the engine start and run for a few second's?Let me know.

The corroded ecm connector make's sense for the no start make sure the ecm connectors on the computer aren't corroded as well. If the connector replacement doesn't work let me know and we will go from there.

What year and model car ecm's were you using?Also do you have injector pulse now sound's like you do if you smell gas.