Welcome Visitor! Please take a few seconds and 428CJ
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- Joined
- Oct 23, 2013
- Messages
- 29
- Reaction score
- 0
- Points
- 0
- Location
- Boise, ID
- Vehicle Year
- 1997
- Make / Model
- Mazda
- Engine Size
- 4.0
- Transmission
- Manual
My dad's 1997 B4000 has developed a severe misfire on the 6th cylinder and is almost undriveable from the subsequent stuttering and hesitations, especially when their is more load on the engine. It has been cold starting a bit harder than it used to, and the stutter has been getting worse with time. We bought it in July and sometimes it would cut out for a split second in third when accelerating. Now it stutters and shakes and hardly accelerates in all gears, especially above 1st.
So far, we have changed:
-All new Autolite plugs.
-New Fuel filter
-New plug wires (the obscenely expense motorcraft ones).
-Sprayed the MAF with MAF cleaner because the MAF looks like it is integrated into the intake tract.
-New coil and cleaned up the old coil contacts. Neither helped.
-New Air filter
- 1/2 can of seafoam in gas tank.
The 6th cyl doesn't seem to be firing at all because the plug looks brand new, but is getting spark.
We are thinking that perhaps the 6th cyl fuel injector is bad or clogged, the lower intake gasket(s) is leaking, or the cam or crank position sensors need replaced.
Anyone have any insight or expierence with this problem. It doesn't always through the cyl 6 misfire code, but always stutters and misses btw.
Thanks.
So far, we have changed:
-All new Autolite plugs.
-New Fuel filter
-New plug wires (the obscenely expense motorcraft ones).
-Sprayed the MAF with MAF cleaner because the MAF looks like it is integrated into the intake tract.
-New coil and cleaned up the old coil contacts. Neither helped.
-New Air filter
- 1/2 can of seafoam in gas tank.
The 6th cyl doesn't seem to be firing at all because the plug looks brand new, but is getting spark.
We are thinking that perhaps the 6th cyl fuel injector is bad or clogged, the lower intake gasket(s) is leaking, or the cam or crank position sensors need replaced.
Anyone have any insight or expierence with this problem. It doesn't always through the cyl 6 misfire code, but always stutters and misses btw.
Thanks.
