Engine Performance problem
1999 Mazda b3000 6 cyl Four Wheel Drive Automatic 209474 miles
My problem is engine knock under load. I run 87 octane gas. If I run E85 gas no knock but fuel mileage sucks. I tried 89 octane gas with no success, I have been able to run 2/3 87 & 1/3 E85 with no knocking. The in line fuel filter has been replaced. The ECM is just been replaced and is up to date. MAF is clean air filter is clean. No diagnostic codes. Spark plugs have all been gapped properly.040" I am the 2nd owner of the truck, and I don't know if the fuel injectors have ever been cleaned or replaced. My question is was this engine designed to run on 87 octane gas? I have replaced the Ign. Coil pack in TSB 20031231 Is there any other way to resolve this problem.
have the same problem?
Tuesday, April 6th, 2010 AT 7:23 AM