J30 Idle problem

[camp1]

Hello,I am having a problem with the idle on my 1993 J30T. Over the past 4 days, the engine idles at about 800 rpm then drops to 400 then catches itself and returns to 800 then drops to 100 then stops completely. It will stall unless I keep my foot on the gas, and even then it acts as though the rpm are trying to drop. I also hear a noticible clatter from the drivers side of the engine (lifters) which also started about the same time as the idle problem. I have seen MAF discussed as a likely culprit? The car has 154,000 miles. We had disaster strike in Feb. The ignition module burned out while traveling at about 40mph, and the engine shut down completely. We also found that the drivers side CAM Sensor was partially melted. As to which caused the shutdown...we aren't sure, but it caused a major timing problem that led to a broken tensioner and 8 bent valves. All this in a town 300+ miles from an Infinity dealer. The car has new plugs, timing belt, clean injectors, new fuel pump, fuel/oil filters...the engine is immaculate after the major repair. I could definately use some help!! Thanks

[Eswift]

very sorry to hear about your misfortune.

when does the erratic idle occur? at a no-load condition with the car in park?

[VimyJ]

I can't help you with your idle problem the VG30DE engine was widely used for Nissan products. A Nissan dealer can handle J engine/transmission problems. Good to know if somethng goes wrong out on the road.

[camp1]

The idle problem occurs when the car has stopped both in park and in drive. It doesn't seem to do it under load, mainly at stop signs and sitting in park with the engine idling. Thanks

[VimyJ]

What is your mileage like?

[maxnix]

Have you inspected your IAC valve? Is your intake path clean? Have you changed your PCV? How is your EGR valve?

[Eswift]

i agree with maxnix, if you want to go at this problem DIY, check out your EGR valve AND tubing = exhaust gas recirculationIACV = idle air control valveand both PCV's