Car chugging

[The Black Pearl]

I started my car after being out with it twenty minutes earlier so the engine was a regular temperture. I was driving out of my driveway and the car started chugging and the RPM was bouncing up and down like the car was going to stall. The road was a bit bumpy from ice and snow. Once I stopped the car about 2 minutes later the engine chugged then resume normal idle. This happened again skiing I let the car warm up for a couple of minute the temperture was minus 6 degrees celsius outside not to cold and the car started doing its chugging thing only when I put the car in gear, it was fine to idle in park. I am thinking the oxgen censor is loose and when I go over bumps it causes the car computer to go nuts. I have a 93 Maxima (230K) that I have installed Iridium plugs less than a year ago and a K&N filter which was cleaned six months ago. I had the oxygen censor replace a year and a half ago because of the RPM going up and down. Could it be anything else and what should I check?

Thanks

[Nahkapohjola]

Originally Posted by The Black Pearl

I started my car after being out with it twenty minutes earlier so the engine was a regular temperture.

I have a 93 Maxima (230K) that I have installed Iridium plugs less than a year ago and a K&N filter which was cleaned six months ago. I had the oxygen censor replace a year and a half ago because of the RPM going up and down. Could it be anything else and what should I check?
Thanks

One issue is extended idle you use to have according your text: that has filled your combustion chambers with soot, and should be cleaned (seafoam?).

"Could it be anything else " ...yes and then some. Your car is a computerized moving sensor platform. Check those.
I live in similar luxury, have combed through a few problems which come via aging and documented them for you plus 'our club'. See my web page what to do...

[jmartinson]

I had a problem with my 2k maxima chugging and it turned out being at least one bad coil pack.

I tried disconnecting one coil pack at a time to see which one was the problem, but it was very intermittent so it was difficult to figure out which one(s) was to blame.... and I heard they started going bad after about 90K, so I just replaced them all.

The fixed my chugging problem immediately.

[The Black Pearl]

Ok..I changed the fuel filter, rotor, distributor cap and wires tonight (Nissan parts). Lets see what happens. I changed the plugs six months ago with Iridium NGK's so they are still good. Car runs really nice but I was trying not to break down and spend money on it since I am selling it or trading it in. Figures something like this would happen.

[The Black Pearl]

Car is running much better, however it did lose power for 5 seconds on two occasions and then started running normally. I guess the problem is still there but not as bad as what it was. Looks like it could be the coil or plugs.

[Nahkapohjola]

Originally Posted by The Black Pearl

Car is running much better, however it did lose power for 5 seconds on two occasions and then started running normally. I guess the problem is still there but not as bad as what it was. Looks like it could be the coil or plugs.

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No, its not. Coil is the last part in u car to break... plugs u changed already.

But u did not repair the grounding pin attachement to the distributor or did not make an add on ground wire as I suggested. If u cared to look the scope pics, u could see what it causes. ECU does not get good square wave...

And dont clean those connectors, keep posting.

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