I had odd bank misfires on my 99. They went away with two new o2 sensors before the cats.
LandBeard
10-19-2017 06:56 PM
Originally Posted by chermecz
(Post 374958)
I changed my coil packs, plugs and wires about 3 months ago no issues until about a month ago I noticed a slight miss while at idle.. Then about a week ago the SEL came on and gave me the 4 even # cylinders and a 1300 code and the multiple misfire code. I bought new plugs again but this time time I used a double platinum autolite and I also purchased STI wires..I noticed a big difference in performance but the missing is still there and not all the time just during low speed or idle.. at least that is when I can tell its missing..although the SEL has not illuminated as of yet.. I have been reading other post with similar problems some point me in the direction of VSS ... I have a 2002 DiscoveryII ..Does this vehicle have a VSS ? I could not find it in RAVE but I found the speed signal sensor is located on the tranny..does this provide the same input for the speedometer in the dash? Any suggestions?:D
Bump. Were you able to confirm what the fix was for your misfires?
I'm currently experiencing the same thing, but on the drivers side. I've removed the upper manifold and next is the valve covers thinking it's a gasket issue or injector issue. Coils seem fine but cylinder 1 spark plug was in rough shape compared to the others. The lower intake valve #1 has lots of build up on the walls. While I'm at it I'll also swap O2 sensors but I'm kind of lost to finding the culprit.
mln01
10-19-2017 09:54 PM
Misfires all on one side of the engine indicate a bad O2 sensor to me, even if you are not getting O2 codes.
LandBeard
10-23-2017 03:48 PM
Originally Posted by mln01
(Post 623185)
Misfires all on one side of the engine indicate a bad O2 sensor to me, even if you are not getting O2 codes.
That's what a lot of members have been saying. (Un)fortunately, I decided to dig into the manifold and valve covers before checking the sensors off my list first. I'll just take this as an opportunity to get more acquainted with my motor and inspect the rocker assemblies/gaskets.
