My 2002 EX with 180K miles has developed a peculiar intermittent miss when the engine is cold. Once the engine has warmed up some – it doesn’t have to be at the operating temperature - the intermittent miss goes away. I’m thinking the miss is ignition related. Looking for suggestions as what additionally to check.
Most pronounced is the engine miss under light acceleration or light loading with a cold engine. I can feel the engine miss and when it misses, I can hear a ticking noise / interference noise through the radio (OEM radio). The ticking noise occurs only when the engine misses, and speeds up / slows down consistent with the engine speed. Turning off the radio eliminates the ticking noise. Also, under light acceleration, the miss is intermittent – I can feel the engine miss for part of a second to a second or two (and also hear the ticking interference noise from the radio) and then the miss goes away for a fraction of a second to a second or two (and the radio ticking interference noise also goes away). When the engine is missing, it feels like more than one cylinder is missing, but not all of them. Once the engine has warmed up a bit – by driving a couple miles – the miss does not occur. Restarting the car with a warm engine does not cause the miss to occur.
I’ve pulled the OBDII codes several times, and then cleared them. The OBDII codes I get vary but are the cylinder misfire codes P0301 through P0306 along with P1399. No codes are stored when the Ody is operated with the engine warmed up a bit.
If I blip the throttle when the engine is cold, the engine takes a second or so to land at idle, which is reasonably smooth. Engine runs like a charm when warmed up a bit, or at operating temperature. I've not noticed a drop in fuel economy.
I’ve replaced all the ignition coils, with no change. I’ve replaced the idle air control valve. Did the EGR passage cleaning (making sure the upper plenum gasket is installed correctly with the tab on the driver’s side rear) and have replaced the EGR valve. I’ve made sure the power steering pressure sensor wire is not broken (checked for continuity in the wires to the electrical connector to the PSP sensor; used TSB 04-007 for reference).
I replaced the spark plugs with OEM when I changed the timing belt 70k miles ago. But, I haven’t pulled the plugs to see if one or more are fouled. Will do that tonight. Based on how the original plugs looked at 110k miles, and that the Ody is not using any oil, I’d be surprised to see the plugs fouled.
Any suggestions? What could cause the Ody engine to intermittently miss when the engine is cold such that I’d hear interference through the radio?
Most pronounced is the engine miss under light acceleration or light loading with a cold engine. I can feel the engine miss and when it misses, I can hear a ticking noise / interference noise through the radio (OEM radio). The ticking noise occurs only when the engine misses, and speeds up / slows down consistent with the engine speed. Turning off the radio eliminates the ticking noise. Also, under light acceleration, the miss is intermittent – I can feel the engine miss for part of a second to a second or two (and also hear the ticking interference noise from the radio) and then the miss goes away for a fraction of a second to a second or two (and the radio ticking interference noise also goes away). When the engine is missing, it feels like more than one cylinder is missing, but not all of them. Once the engine has warmed up a bit – by driving a couple miles – the miss does not occur. Restarting the car with a warm engine does not cause the miss to occur.
I’ve pulled the OBDII codes several times, and then cleared them. The OBDII codes I get vary but are the cylinder misfire codes P0301 through P0306 along with P1399. No codes are stored when the Ody is operated with the engine warmed up a bit.
If I blip the throttle when the engine is cold, the engine takes a second or so to land at idle, which is reasonably smooth. Engine runs like a charm when warmed up a bit, or at operating temperature. I've not noticed a drop in fuel economy.
I’ve replaced all the ignition coils, with no change. I’ve replaced the idle air control valve. Did the EGR passage cleaning (making sure the upper plenum gasket is installed correctly with the tab on the driver’s side rear) and have replaced the EGR valve. I’ve made sure the power steering pressure sensor wire is not broken (checked for continuity in the wires to the electrical connector to the PSP sensor; used TSB 04-007 for reference).
I replaced the spark plugs with OEM when I changed the timing belt 70k miles ago. But, I haven’t pulled the plugs to see if one or more are fouled. Will do that tonight. Based on how the original plugs looked at 110k miles, and that the Ody is not using any oil, I’d be surprised to see the plugs fouled.
Any suggestions? What could cause the Ody engine to intermittently miss when the engine is cold such that I’d hear interference through the radio?
