[RobTaco]

Hello all - could use some help.

I have a 98 Tacoma, 6 cyl auto, 126K miles. The timing belt was replaced at 100K.

In the last few weeks, I have had the CEL come on with OBD codes p0302 and p0305. Other than having a bit less power at startup, it seems to run fine.

The CEL seems to flash mostly at highway speed.

I have replaced the plugs, wires, and the coil pack that services cyls 5 and 2 with no change.

The plugs look good - no fouling or indications of a lean condition. I checked the compression and all cylinders are in spec, with no more than 10% difference between any cylinders. The injector resistance is 13.8 +/- on all cylinders.

All vacuum connections look good - I don't see any leaks.

Despite the good resistance numbers, I suspect bad injectors...any thoughts?

Thanks,
Rob

 

[RobTaco]

Just for follow-up - I tracked the problem to the timing belt tensioner letting go. It allowed the timing to vary and gave the misfire codes...now why it only registered cyls 2 and 5, I have no idea, but replacing the tensioner fixed the problem.

Rob