VERY confusing misfire issue!!
Just FYI... the crank relearn will not fix any actual misfiring. It is only used as a way to monitor for misfires.
Does it still get worse in the rain? Can you duplicate the condition by misting water in certain areas?
Does it still get worse in the rain? Can you duplicate the condition by misting water in certain areas?
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Would also like to know if this was fixed????
I had a 99 Jimmy once that had random misfires. It turned out to be the bottom of the fuse block was corroded. It was also causing flickering interior lights. May wanna check fuse block and any bulkhead connectors.
I had a 99 Jimmy once that had random misfires. It turned out to be the bottom of the fuse block was corroded. It was also causing flickering interior lights. May wanna check fuse block and any bulkhead connectors.
"The generic OBD II protocol works on a request system, which means that the scan tool has to actually ask the ECM for each PID (In OBD II a PID stands for parameter identification). This OBD II request operation contrasts with the OEM communications protocols that work using data packets, whereby, the data stream PIDs is sent in bursts or packets. However, generic OBD II standardized the whole communications process and made it possible to, at least, have access to a minimum of data for diagnostics regardless of make and model. In generic OBD II, by simply reducing the amount of PIDs on the screen a faster data rate can be obtained, since the scanner has to request less data. By combining different and faster data PIDs to form a relationship, a signal correlation can be arrived at. An example is an EGR valve that is commanded on (manually or otherwise) which should have an effect on the MAP sensor. A lack of MAP sensor response is a good indication of a defective or clogged EGR valve, since an opening EGR valve should create a drop in intake vacuum. The same PID strategy is also employed by the ECM when running each drive cycle. The difference is that we can also use these techniques to our advantage when diagnosing a vehicle."
I hope this helps explain a litte. for more info check out this site http://www.autodiagnosticsandpublish..._parameter.htm
I hope this helps explain a litte. for more info check out this site http://www.autodiagnosticsandpublish..._parameter.htm
THIS^^. Great post.
