1994 saturn sc2 backfires during acceleration

SOURCE: saturn

Open the hood if it says efiohc or single cam on the valve cover then it is a sc1 if it says dohc or twin cam than it is an sc2

SOURCE: 2001 saturn sc2 gets code 341&340 camshaft sensor

if you have high resistance in secondary ign. system (plug wires, ign.coil) this will cause this code to set. make sure you are using a high quality spark plug wire set. not from autozone!!! and denso non platinum tipped spark plugs. also use a diaelectric grease on plug wires to keep moisture out.

Bruce Bracey

• 1000 Answers
• Posted on Apr 25, 2009

SOURCE: fuel injectors don't work on 1994 Saturn sc2

There is a (#1 Ignition Fuse) located in the under hood fuse box. Remove the fuse to make sure it is not blown. If the fuse is good we will have to check for injector pulse. Let me know if you have a 12 volt test light and you will need a "noid" light to figure out if the ECM is driving the injectors.
Let me know.
Regards,

SOURCE: 1993 Saturn sc2 stutters and backfires accerlerating

Check to see it th chain guides are worn. this can cause a retarded or advance on timing. Also do a compression check if you can, this will show that the valves are opening and closing on time. Run some injection cleaner through it first as a sticky injector could also be an issue.

SOURCE: 1997 Saturn SC2 squeals very loud the first 3-5miles

Try replacing the belt tensioner. Comes out easily, once you figure out access to it. Remove inspection panel inside front passenger side wheel well. Tensioner is right there, two bolts. If the spring gets weak, the belt will squeak.