Join Date: Apr 1999
Location: Justin,Texas, Republic of TEXAS (USA)
Feedback Score: 0 reviews
The electrical issue to first resolve is checking the glow plug relay system. The big relay behind and the passenger side of fuel filter housing should have less than .5V if you put DC voltmemeter leads on the 5/16" posts (1/2 nut) with cold engine and then watch voltmeter when someone turns ignition on and the glow plugs are powered through the relay. If the voltage difference is more than .5V then the relay is bad and glow plugs are not working. If the really checks good then it might be a good idea to get compression checked. I have diagnosed a bunch of 7.3 poor cold start and poor idle as dusted engines from poorly fitted air filters and/or cracked or misfitted hoses from air filter to turbo. The turbo compressor blades that are visible with the air inlet hose off turbo will often tell the story. The blades should have a blunt forward edge and the tip of the blades would be a sharp 90 degree where blade edge is at turbo housing. When the blades cut through unfiltered dirty air the blade edge gets sharp and worn and the 90 degree cut of the end of each blade gets rounded off. The sensors on the engine are injection control pressure on the LH cylinder head at front top, oil temp sensor, and the exhaust back pressure sensor. ICP sensors are known failures but usually poor running will also cause the sensor to leak oil into electrical connector. Oil temp is not a drivability issue cause as it is the sensor used to shut down the back pressure control damper and fast idling when the oil temp gets warm with warm engine. Not a cause of rough idle. Cam position sensor down to the right and above (passenger side) crank pulley can cause start and idle quality problems but not usually temp related. The cam position sensor was subject to a recall and likely has been replaced but I have seen the update ones installed 10+ years back fail.
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