# 5 cylinder fowls out plugs. What's causing this problem.? Loss of power . ideals very low runs crappy

Asked by Nov 15, 2015 at 03:57 PM about the 1999 Pontiac Firebird Base

Question type: Maintenance & Repair

3 Answers

25,505

low compression...bad rings...bad valve guide...BAD VALVE SEAL....intake manifold gasket leak...cracked head....bad plugs/gap/plug wire....TELL YOU WHAT...U DIDNT SAY WHEN OR HOW LONG....BUT I BET IF YOU TAKE THAT PLUG AND REPLACE IT WITH ONE 2-3 HEAT RANGES HOTTER THAT WILL FIX IT ...FOR ABOUT $2.00...SAY IF YOU HAVE A >R 43 GO UP TO A >R 45 !!!

1 of 1 people found this helpful.
65,135

If you only have one bad cylinder then try a hotter plug which will help burn off the excess oil. How many miles are on the car?

1 of 1 people found this helpful.
67,365

Is it oil fouled or gasoline fouled? If oil fouled it's probably bad rings, or bad valve guide seal on that cylinder. Using a hotter plug, as suggested above should stop the fouling. You can also try a spark plug anti-fouler on that plug as well. If it's gasoline fouled you probably have a bad fuel injector on that cylinder. HTH. - Jim

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