It's not technically required after a tune up, but I do it after every misfire repair to guard against false misfire codes.ġ. This resets the idle adaptives AND the misfire detection profile. This is a bit of a stretch, but have you performed the ECM Reset since the repairs were done? Not just a code clear, the actual 'ECM Reset' under Functional Tests in the Modis. Sucks, 'cause that requires pulling the upper intake again. You could try moving an injector? I see that you scoped them, but I'm thinking of a flow rate difference, or a poor spray pattern. You could try disconnecting the EGR valve, and see if it'll reset a misfire code.Īt idle. If the individual ports clog, then some cylinders get more EGR than others. I can't remember which Honda V6 engines worked this way, but I do know some of them have cylinder specific EGR ports in the intake, while others just feed the EGR gasses into the common plenum. I think the EGR could account for a miss during cruise, but not at idle. I figure if it was fuel pressure, the engine would break up under heavy load or high rpm.īig Thanks to Paul Danner for all your videos and your website! You taught me a lot! I will be buying your book very soon. I have not checked Timing or Fuel Pressure. Could EGR Still cause a misfire at idle and under load even though values seem good?Ģ. Disconnected Purge Control Valve - No change in misfire Previously tested PCV for proper operation and leak testġ. Checked Compression - 240-248 PSI on all cylindersġ2. 98 to 1.03 (1.00 Seems to be 0 Correction) Sometimes it will hang around 1.03 but does the same now and then at. Fluctuates linearly with throttle response on a scope and stays consistent at idleħ. Checked MAP Sensor voltage at idle - 0.8 to 0.9 volts. While EGR is inactive, position voltage is around 1.1 volts.Ħ. Manually activated EGR and engine stalled immediately. Checked EGR Operation and Position Voltage Value. I should probably upload a pic of the waveform as its hard to see any pintle hump in the waveform in any of the injectors.ĥ. Scoped Fuel Injector Control Side - Consistent with no drop outs. The "turn off" event was mostly straight down except at the very bottom where there were lots of small oscillations which was consistent the entire time I was scoping that circuit. I did have a funky square wave on one coil but that seems to have disappeared after moving that coil and retesting that specific control circuit and the new control circuit the coil is now on. Scoped Control Signal to Coils - Consistent with no drop outs 3 Wire coils so I only get a pulsed square wave. Replaced 1 Coil Found to fail 2nd day into Diag creating another dead miss. Performed Coil Stress Test (Spark Gap Test) - All Coils had hot bright loud blue spark at 25KV Gapģ. Basic Hands on check first, found one coil unplugged. MAP Sensor reading steadily climbs as engine starts to stall. Stalls at times during consecutive snap throttle tests while engine falls to idle. Creating a very very slight shutter to the point you can't even really feel it.Ģ. Very Light Misfire at idle and under load. I don't know if the engine run without misfires after the previous work was done.ġ. Sometimes it will give specific 4 specific cylinders but it seems the cylinders it gives, changes from time to time after erasing the codes. The vehicle is now back with a random misfire once again. Previously 1 month ago, 3 Coils and 6 Spark Plugs were replaced at our shop before I was employed there due to random misfires. Waekon AutoWave 1ch Scope (Personal Scope) Old Snap on MODIS w/ 4Ch Scope (Shop Scope) No amp probe I have done a bunch of diag on it and I'm getting stumped. Came in due to a P1399 Misfire and 1 dead miss. I have in our shop a 2002 Honda Odyssey with 148K miles on it.
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