WILL FAULTY FUEL INJECTOR FLOOD A SPARK PLUG CAUSING IT TO MISFIRE ON A 1998 VOLVO S70

30

Asked by Feb 14, 2014 at 12:31 AM about the 1998 Volvo S70

Question type: Maintenance & Repair

I'M CONSIDERING BUYING A 1998 VOLVO S70. IT HAS 3 CODES: P0300, P0303 & P0304. I'VE REPLACE SPARK PLUG IN # 3 & #4 CYLINDERS AND IT IS STILL MISFIRING AT 2000 RPMS AND LOWER. IT RUNS FINE ABOVE 2000 RPM'S. IT'S FIRING FINE AT IDLE SPEED; SO I DON'T THINK IT'S THE IGNITION. IS CODE P0300 A VACCUM LEAK? OR A SENSOR PROBLEM?

6 Answers

63,315

Code P0300 is random/ multi-cylinder misfire. That code is probably being triggered by more than one cylinder misfiring. Were the spark plugs from those two cylinders wet and smell like gasoline? If so than the fuel injectors are leaking and fouling the spark plugs as you suspect. HTH. -Jim

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Best Answer
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CYLINDER 3 & 4 ARE MISFIRING AND THE OLD SPARK PLUGS DID LOOK WET AND SMELLED LIKE GASOLINE. IF THE INJECTORS ARE LEAKING; WOULD THE CAR STILL RUN SMOOTH ABOVE 2000 RPMS?

3 out of 3 people think this is helpful.
63,315

Most likely yes. When at the higher RPM the plugs get hotter and the excess fuel evaporates faster. Plus you're introducing more air into the cylinder to make up for the excess fuel. HTH. -Jim

2 out of 2 people think this is helpful.
4,565

Most 1998's have a cap and rotor. Replace them.

4,565

Most 1998's have a cap and rotor. They are probably shot. Remove spark plug wires from engine, inspect them, replace if they have never been replaced. Use Volvo OEM (Bougicord brand) ONLY. Make sure wires are not soaked in oil. If they are, change your oil cap seal. Replace spark plugs with OEM Volvo plugs ONLY.

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