Guest hotrod97z Posted January 16, 2006 Share Posted January 16, 2006 I bought a '87 Pathfinder a few weeks ago. I replaced the plugs, wires, distributer cap/rotor, air filter & fuel filter after I bought it. The truck has a "miss" at 2800 RPM that acts exactly like a rev limiter. This "miss" happens every time the truck reaches 2800 RPM, whether under load or no load. If this is a fuel issue, it should stall at a different RPM with no-load than under load. If it is an electrical problem, it should miss at lower RPMs also. This leaves me to believe this may be an engine control issue. Has anyone had a problem like this before? Alan Link to comment Share on other sites More sharing options...
02flhrci Posted January 16, 2006 Share Posted January 16, 2006 I bought a '87 Pathfinder a few weeks ago. I replaced the plugs, wires, distributer cap/rotor, air filter & fuel filter after I bought it. The truck has a "miss" at 2800 RPM that acts exactly like a rev limiter. This "miss" happens every time the truck reaches 2800 RPM, whether under load or no load. If this is a fuel issue, it should stall at a different RPM with no-load than under load. If it is an electrical problem, it should miss at lower RPMs also. This leaves me to believe this may be an engine control issue. Has anyone had a problem like this before? Alan http://www.nissanpathfinders.net/forum/index.php?showtopic=7355 Link to comment Share on other sites More sharing options...
94extreme Posted January 16, 2006 Share Posted January 16, 2006 run ECU codes (sticky in the garage.) it maybe the crank position sensor.. look in the lower posts of the link above. Link to comment Share on other sites More sharing options...
Guest hotrod97z Posted January 16, 2006 Share Posted January 16, 2006 Thanks guys. Link to comment Share on other sites More sharing options...
nissandoms47 Posted January 16, 2006 Share Posted January 16, 2006 its not the crank position sensor because when i did my trans swap im still waiting on getting a new plug so right now its unplugged. i get a check engine light but i revved my all the way to redline and it ran fine. have you ran ECU codes yet? Link to comment Share on other sites More sharing options...
Guest hotrod97z Posted February 21, 2006 Share Posted February 21, 2006 (edited) Update: I drove to my parent's house last month (about 100 miles away) to work on the Pathfinder again. I checked the MAF per the service manual's recommendation and it tested OK. I checked the code in the ECM and found an injection code. I checked the resistance on the injectors and one was about 10 times what it was supposed to be. The wierd thing is that both injectors tested OK with 1.5 ohms of resistance each when I checked them through the wiring harness; however, when I removed the top of the throttlebody and rechecked, one had a resistance of 10.5 ohms. Wierd, but stranger things have happened. Edited February 21, 2006 by hotrod97z Link to comment Share on other sites More sharing options...
speedy Posted February 21, 2006 Share Posted February 21, 2006 Mine did the same thing this past spring, it puts itself into safe mode if the ECU dosesn't detect or the injector misses more than four times in a row. Check the wires from the ECU to the injector plug, you should have 0 resistance. All I did with mine was run a jumper wire from ECU to just before the injector connector and problem was solved. When I get out of work today I can give what pin number from the ECU to which color wire of the injector to test. Link to comment Share on other sites More sharing options...
speedy Posted February 21, 2006 Share Posted February 21, 2006 Ok, to find out which wire is bad test from ECU pin 101 & 102 to injector "A" black wire. Next from ECU pin 103 & 104 to injector "B" black wire with a blue stripe. Which ever one has resistance is no good and you need to bypass. Good luck, Tim Link to comment Share on other sites More sharing options...
87pathy Posted February 22, 2006 Share Posted February 22, 2006 Speedy says "Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting "...holy shiznit...what a ride!" That is the coolest thing i have heard in a while! Link to comment Share on other sites More sharing options...
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