LeonbergerG Posted October 7, 2012 Report Share Posted October 7, 2012 I've Been having issues with my Nissan for awhile now and it's got me running in circles. If anyone could help please do. 1986 1/2 Nissan D21 hardbody. Z24 engine Truck will run fine for a few days then no warning just stall. I have replaced cap rotor, plugs, dropped tank and checked fuel strainer,r replaced fuel filter air filter and had it to a mechanic that could not get it to break down on him. If anyone has any ideas please help. My next guess will be changing the pick up coil in the distributor but I'm not 100% sure that's it. Still gets fuel when it dies, seems like the timing changes though as it back fires through the exhaust and intake when it does die. Quote Link to comment Share on other sites More sharing options...
LeonbergerG Posted October 7, 2012 Author Report Share Posted October 7, 2012 Working on it tonight, almost seems like it is flooding itself out. Quote Link to comment Share on other sites More sharing options...
Mark1647545493 Posted October 11, 2012 Report Share Posted October 11, 2012 is the ECU under the passenger side seat getting wet? My 88 Hardbody with a z24 did all kinds of weird shit when the ecu would get wet. Also check it for trouble codes. Quote Link to comment Share on other sites More sharing options...
LeonbergerG Posted October 12, 2012 Author Report Share Posted October 12, 2012 Not getting wet. But it was in a flood a few years back. Computer and injectors have been changed. Quote Link to comment Share on other sites More sharing options...
WheelSpin Posted October 12, 2012 Report Share Posted October 12, 2012 How does the tank look? My old hardbody tank was leaking water in and making it run really funny like that till I noticed the water/fuel separation while checking the fuel pump for pressure. Might not be it but it's a 30 second check. If not I'd definitely try the coil. Quote Link to comment Share on other sites More sharing options...
LeonbergerG Posted October 12, 2012 Author Report Share Posted October 12, 2012 Dropped the tank2 weeks ago and it was clean inside. No water strainer was good. Checked today and the computer was flashing 2 red 3 green not sure what code that is.... Quote Link to comment Share on other sites More sharing options...
Mark1647545493 Posted October 12, 2012 Report Share Posted October 12, 2012 WITH KEY IN THE RUN POSITION AND THE ENGINE NOT RUNNING FLIP THE ECM SWITCH ON.. IT WILL BLINK 1 TIME THE 2 TIMES THEN THREE TIMES THEM 4 AND FINALLY FIVE TIMES AND THEN REPAEAT.. THESE ARE THE MODES.. AFTER IT BLINKS THREE TIMES TURN THE ECM SWITCH OFF AND THEN RECORD THE CODES.. I'm still looking for the code table for ya Quote Link to comment Share on other sites More sharing options...
LeonbergerG Posted October 15, 2012 Author Report Share Posted October 15, 2012 Looks like it's the hard idle switch.... found the code in the chiltons book. Quote Link to comment Share on other sites More sharing options...
Mark1647545493 Posted October 18, 2012 Report Share Posted October 18, 2012 I know you said you figured it out, but just in case someone else needs the info.. Pre-88 Nissan Trouble Code Info ENTERING SELF-DIAGNOSTICS 1) Turn ignition switch to ON position. Use a screwdriver to turn ECM diagnostic mode selector fully clockwise. 2) Wait for inspection lights to begin flashing. At this time, inspection lights will flash mode options (i.e., one flash for Mode I, 2 flashes for Mode II, etc.). As soon as inspection light flashes desired mode number (3 flashes for self-diagnostic mode), turn mode selector off (fully counterclockwise) 3) If mode selector is kept in ON position (fully clockwise), mode selections will continuously cycle. This cycling will not erase memory. RETRIEVING CODES NOTE: Not all trouble codes will activate MIL (CHECK ENGINE light) Trouble codes are read using Red LED and Green LED inspection lights on side of ECM. After selecting Mode III, trouble codes corresponding to mode will start flashing. Trouble codes are indicated by number of flashes from ECM Red LED and Green LED inspection lights. Count number of flashes. Red LED indicates first digit of code, and Green LED indicates second digit of code. For example, 3 flashes of Red LED followed by 2 flashes of Green LED indicate Code 32. SELF-DIAGNOSTIC SYSTEM Self-diagnostic system can be operated in any of 5 modes. Modes are manually changed using screwdriver through access port of ECM. With screwdriver turned fully clockwise, inspection lights will begin to flash. Count number of flashes. First flash is Mode I, second flash is Mode II, etc. When desired mode has been indicated, turn screwdriver fully counterclockwise. In different modes, Red LED and Green LED perform different functions. Mode I (Exhaust Gas Monitor) This is normal vehicle operating mode. Green LED will indicate loop status. If Green LED is not blinking, vehicle is in open loop or a fault exists with oxygen sensor or sensor circuit. If Green LED is blinking, vehicle is in closed loop. If a malfunction occurs in Mode I, Red LED and MIL (CHECK ENGINE light) will illuminate, indicating an engine control system malfunction has occurred. Mode II (Mixture Ratio Feedback Monitor) In Mode II, both Red LED and Green LED are used to monitor air/fuel mixture feedback control. Green LED will function as in Mode I. In open loop, Red LED and Green LED will remain on or off. For results to be valid, vehicle must be in closed loop. In closed loop, Red LED will indicate if system is running rich (light off), lean (light on) or at ideal air/fuel ratio (blinking synchronized with Green LED) Mode III (Self Diagnostics) When Mode III is accessed, codes stored in ECM memory will be flashed by Green LED and Red LED on side of ECM. Red LED will flash first digit of code, while Green LED will flash second digit of code. For example: 3 flashes of Red LED followed by 5 flashes of Green LED indicate a Code 35. Mode IV (Switch Check) This mode is used for checking engine control systems switch status. When idle switch or starter switch is activated, Red LED will come on and go off as status changes. For vehicle speed sensor status, Green LED will remain off when vehicle speed is less than 12 MPH and come on when vehicle speed is greater than 12 MPH. Mode V (Test Mode) Mode V represents a real-time diagnostic test of camshaft position sensor, ignition signal and mass airflow output signal. This mode is accessed for an in-bay running test of vehicle. Red and Green LED5 must be monitored carefully during this test, with special attention paid to number of flashes before each pause. Malfunction code will be displayed only once and will not be stored in memory. If Red LED blinks on and off evenly, a fault exists in camshaft position sensor. If Green LED flashes twice before a pause, a fault exists in airflow meter. If Green LED blinks 4 times before a pause, a fault exists in ignition signal. Trouble Codes Without Onboard Diagnostics (OBD-II) 11 Camshaft position sensor. 12 Mass airflow (MAF) sensor. 13 Engine coolant temperature (ECT) sensor.. 14 Vehicle speed (VSS) sensor. 21 No ignition referance. 23 Throttle Valve Switch 24 Transmission Switch 31 Engine control module (ECM).- A/C, light,fan and PS switch 32 EGR sensor.- starter switch 33 Oxygen sensor. 34 Knock (detonation) sensor (3.0 L). 35 EGR temp sensor. 41 Air temp sensor. 43 Throttle position sensor (TPS). 44 Normal Operation 45 Injector leak. 51 Injector circuit (3.0 L). 55 No malfunction recorded. * 88–94 1. Turn ignition On. 2. On all models except Pathfinder, Pickup and Van, proceed as follows: 1. Turn diagnostic mode selector on ECU fully clockwise and wait until inspection lamps flash. Number of flashes displayed indicates corresponding mode. 2. Note number of flashes, then immediately turn diagnostic mode selector fully counterclockwise. 3. 3. On Pathfinder, Pickup and Van models, proceed as follows: 1. Turn diagnostic mode selector on ECU to On position and wait until inspection lamps flash. 2. Note number of flashes, then immediately turn diagnostic mode selector to Off position. 4. On all models, when ignition is turned Off during diagnosis, in each mode, and then turned back On again after power to the ECU has dropped off completely, diagnosis will automatically return to Mode I. 5. For description of modes, proceed as follows: 1. Mode I (Mixture ratio feedback control monitor A): during a closed loop condition, the green inspection lamp turns on when lean condition is present and goes off when a rich condition is present. During an open loop condition, the green inspection lamp stays off. 2. Mode II (Mixture ratio feedback control monitor B): during a closed loop condition, the red inspection lamp turns on and off simultaneously with the green inspection lamp when mixture ratio is controlled within a predetermined value. During an open loop condition, the red inspection lamp stays off. The green inspection lamp function is the same as in Mode I. 3. Mode III (Self diagnosis): in this mode the DTC is indicated by both the red and greed inspection lamp. The red inspection lamp corresponds to units of 10; the green inspection lamp corresponds to units of one. 4. Mode IV (Switches on/off diagnosis): during this mode, the inspection lamps monitor switch on/off condition of the throttle valve switch, starter switch and vehicle speed sensor. 5. Mode V (Real time diagnosis): if a malfunction is present during a driving test, the inspection lamps will display the malfunction condition immediately. READING DIAGNOSTIC CODES The Electronic Control Unit (ECU) monitors several engine sensors and actuators. If a problem occurs the information is stored in the ECU's memory for retrieval. The codes are displayed by the red diode on the ECU. The codes are interpreted by the number of times and duration the diode flashes. The red diode will flash for 0.6 of a second with 0.6 of a second delay between flashes "X" number of times, this will represent units of ten. Then there will be a delay 0.9 of a second and the red diode will flash for 0.3 of a second with 0.3 of a second delay between flashes "X" number of times, this will represent units of one. There will be a delay of 2.1 seconds between codes. For example, if the red diode flashes once and then flashes twice rapidly this should be interpreted as code 12. The codes are displayed in numerical order starting with the lowest and ending with the highest. Quote Link to comment Share on other sites More sharing options...
LeonbergerG Posted October 18, 2012 Author Report Share Posted October 18, 2012 Thanks. But not the only thing is, what's a throttle valve switch?? This thing is driving me nuts. Quote Link to comment Share on other sites More sharing options...
Browning Posted October 24, 2012 Report Share Posted October 24, 2012 not sure if this fits your particular problem but check here http://www.infamousnissan.com/forum/showthread.php?t=7011 I'd find that harness and play with it while it's running see if you can get it to act up Quote Link to comment Share on other sites More sharing options...
LeonbergerG Posted October 25, 2012 Author Report Share Posted October 25, 2012 I actually have read that before. Have cut the harness apart, the splice was not broken looked brand new still... I have googled the hell out this issue... Quote Link to comment Share on other sites More sharing options...
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