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gscaesar · 04-21-2009, 06:35 PM

ECTS was not it - stalled after replacement. Next I replaced spark plugs (new NGK coppers) and cleaned/tightened the ground screws a few weeks ago. Same story - drove great for a week or two, then stalled on me on the way home from work today in stop and go traffic.

Any more ideas? Anything I'm missing?

To summarize the story so far:

Symptoms:
(1) Car intermittently drops to low RPMs (200 - 300) and stalls. Typically happens when I just start the car and am pulling out of a parking spot, or am coming to a stop at a traffic light. Normal rpms is 700-750.
(2) By intermittent I mean no problems at all for a week of commuting to work (18 miles one way, twice a day for a week). Then it happens half a dozen times. Then nothing for a few days ...
(3) I believe a feel power loss at lower RPMs some times (in the 1000 - 2500 rpm range).
(4) I live in Houston TX. Happens on cool mornings ~40 degF and hot ~80 degF days.
(5) Happens when I just start the car for the first time in a day, not yet warmed up. Also happens after car has been running and is warmed up.
(6) Can reproduce stall with transmission in Drive, Reverse, and Park (To stall in Park, I had to let it idle for hours before it died).

TRIED BUT NOT A SUCCESS:
(1) No trouble codes ever. No check engine light ever.
(2) Disassembled, cleaned, and ohm-tested the three phases of my IACV per Factory Service Manual procedure. Whistle clean. Made no difference.
(3) Replaced fuel filter. Made no difference.
(4) Replaced PCV. Made no difference.
(5) Replaced starter (after it finally went out from all the restarting). Made no difference.
(6) Disassembled and cleaned the throttle body (used the instructions in the FAQ sticky). Made no difference.
(7) Run 91 octane gas. No difference.
(8) Ran a tank with fuel injector cleaner. No difference.
(9) Replaced the Throttle Position Sensor (TPS). No difference.
(10) Found and fixed a minor power steering leak dripping onto my upstream oxygen sensor (leak traveled from return hose down the wires). Made no difference. Confirmed with my ScanGauge II stalling still occurs both open and closed loop (ie - happens when this sensor is not used by computer). Made no difference.
(11) Found and closed a cracked nipple on the breather hose from the air plenum to my engine. (Found that one trying to evacuate for Hurr Ike the morning it was rolling in). Made no difference.
(12) Gave up and took car to Jimmy's in Baytown, a very good mechanic specializing in Nissans, Toyotas, Hondas. He reproduced but could not find cause.
(13) Gave up and took car to the Baytown Nissan Dealer. They could reproduce, then asked for $800 to do a wire trace, thinking it might be electrical (ie - they are guessing too). I politely declined and took the car back without the trace.
(14) Had fuel system pressure checked at Baytown Nissan. Ran full pressure, no problems.
(15) Replaced Engine Coolant Temperature Sensor (the one to the computer, not the dash). Thought I was good - made it 141 miles and 6 days with no stalling. Then four stalls in a row at a stoplight.
(16) Cleaned MAF with CRC Mass Air Flow Sensor Cleaner. No difference.
(17) Replaced Spark plugs (NGK platinums with ~50k miles on them) with new NGK coppers. No difference.
(18) Cleaned grounding screws. No difference.

Help!

04-21-2009, 06:35 PM	#46
gscaesar Junior Member 96 Maxima GLE Join Date: Jan 2007 Location: Houston TX iTrader: (0) Posts: 15	ECTS was not it - stalled after replacement. Next I replaced spark plugs (new NGK coppers) and cleaned/tightened the ground screws a few weeks ago. Same story - drove great for a week or two, then stalled on me on the way home from work today in stop and go traffic. Any more ideas? Anything I'm missing? To summarize the story so far: Symptoms: (1) Car intermittently drops to low RPMs (200 - 300) and stalls. Typically happens when I just start the car and am pulling out of a parking spot, or am coming to a stop at a traffic light. Normal rpms is 700-750. (2) By intermittent I mean no problems at all for a week of commuting to work (18 miles one way, twice a day for a week). Then it happens half a dozen times. Then nothing for a few days ... (3) I believe a feel power loss at lower RPMs some times (in the 1000 - 2500 rpm range). (4) I live in Houston TX. Happens on cool mornings ~40 degF and hot ~80 degF days. (5) Happens when I just start the car for the first time in a day, not yet warmed up. Also happens after car has been running and is warmed up. (6) Can reproduce stall with transmission in Drive, Reverse, and Park (To stall in Park, I had to let it idle for hours before it died). TRIED BUT NOT A SUCCESS: (1) No trouble codes ever. No check engine light ever. (2) Disassembled, cleaned, and ohm-tested the three phases of my IACV per Factory Service Manual procedure. Whistle clean. Made no difference. (3) Replaced fuel filter. Made no difference. (4) Replaced PCV. Made no difference. (5) Replaced starter (after it finally went out from all the restarting). Made no difference. (6) Disassembled and cleaned the throttle body (used the instructions in the FAQ sticky). Made no difference. (7) Run 91 octane gas. No difference. (8) Ran a tank with fuel injector cleaner. No difference. (9) Replaced the Throttle Position Sensor (TPS). No difference. (10) Found and fixed a minor power steering leak dripping onto my upstream oxygen sensor (leak traveled from return hose down the wires). Made no difference. Confirmed with my ScanGauge II stalling still occurs both open and closed loop (ie - happens when this sensor is not used by computer). Made no difference. (11) Found and closed a cracked nipple on the breather hose from the air plenum to my engine. (Found that one trying to evacuate for Hurr Ike the morning it was rolling in). Made no difference. (12) Gave up and took car to Jimmy's in Baytown, a very good mechanic specializing in Nissans, Toyotas, Hondas. He reproduced but could not find cause. (13) Gave up and took car to the Baytown Nissan Dealer. They could reproduce, then asked for $800 to do a wire trace, thinking it might be electrical (ie - they are guessing too). I politely declined and took the car back without the trace. (14) Had fuel system pressure checked at Baytown Nissan. Ran full pressure, no problems. (15) Replaced Engine Coolant Temperature Sensor (the one to the computer, not the dash). Thought I was good - made it 141 miles and 6 days with no stalling. Then four stalls in a row at a stoplight. (16) Cleaned MAF with CRC Mass Air Flow Sensor Cleaner. No difference. (17) Replaced Spark plugs (NGK platinums with ~50k miles on them) with new NGK coppers. No difference. (18) Cleaned grounding screws. No difference. Help!