what is code p0303 on a 1997 saturn sl series

Asked by hex55 Jan 12, 2015 at 01:53 PM about the 1997 Saturn S-Series 4 Dr SL Sedan

Question type: Maintenance & Repair

I changed wires and plugs and service engine soon light is still on. when I accelerate the gas pedal the light blinks on and off. what could the issue be

4 Answers

25,265

Code P303 is a misfire detected by the crankshaft sensor. Misfire in a cylinder could be several different possibilities. First I would check compression in the cylinder to make sure the valves are seating properly. It could be an intake leak or fuel injector problem as well.. Tests would have to be performed and data collected to pinpoint the problem.

1 people found this helpful.
25,265

I would like to add code P303 is for cylinder #3. At least it's not a random misfire which are hard to troubleshoot. Cylinder 3 is where your problems are, so start there.

1 people found this helpful.
25,265

I should collect my thoughts before I post, but the answer as to why the check engine light is blinking is because this indicates an engine malfunction which could cause more damage if continued driving the vehicle without getting the problem resolved. In a misfire condition, raw fuel could be sent down the exhaust manifold to ignite in the catalytic converter causing damage. This could make bigger problems down the line if not corrected.

2 people found this helpful.
10

sometimes if you change out spark plug and wire in cylinder that misfired situation is corrected.

1 people found this helpful.

Your Answer:

S-Series

Looking for a Used S-Series in your area?

CarGurus has 38 nationwide S-Series listings and the tools to find you a great deal.

ZIP:

Own this car?

Share your experience with others.

1997 Saturn S-Series

Review another car

CarGurus Experts

  • #1
    Alex Nazarian
    Reputation
    2,650
  • #2
    Paul Martin
    Reputation
    1,980
  • #3
    helpmeplease
    Reputation
    1,460
View All

Know more, shop wisely

Search

Used Cars For Sale

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.