Dannyg Posted July 16, 2016 Share Posted July 16, 2016 have a stock 93 pathfinder SE. Havent had really any problems and than it started to have issues when driving it would bog a little like its not getting gas or my first assumption was a misfire. So i changed the spark plugs. Wires and cap and rotor. I had someone tell me to unplug the o2 sensor and if it runs fine theres my problem but i did and still had the sputtering issue. One key clue i think is after sitting all night long. When i first start to drive it. It runs alright and wont sputter. And after driving for say 15 20 minutes it starts to sputter all the time as if im running low on gas or something. Im hoping someone can help correctly indentify the issue. Link to comment Share on other sites More sharing options...
1987caddy Posted July 16, 2016 Share Posted July 16, 2016 Does the check engine light come on when it's running bad? Link to comment Share on other sites More sharing options...
pepperjack26 Posted July 16, 2016 Share Posted July 16, 2016 When was your fuel filter replaced last? If original, you could replace that for a low price. We had a similar issue with one of our delivery vehicles at work. Link to comment Share on other sites More sharing options...
Dannyg Posted July 17, 2016 Author Share Posted July 17, 2016 Check engine light doesn't come on. The fuel filter was the next thing i was going to replace. Only reason i am thunking it may not be that is cause its first time driving for the day it runs fine and has acceleration for only about 15 minutes of running. Will update when i actually do change the fuel filter to confirm if that was it or not. Thank you Link to comment Share on other sites More sharing options...
1987caddy Posted July 17, 2016 Share Posted July 17, 2016 Mine was doing the same and it was the 02 sensor. Would fall on its face and ran worse the harder you pressed the gas Link to comment Share on other sites More sharing options...
Dannyg Posted July 21, 2016 Author Share Posted July 21, 2016 So i replaced the fuel filter. Wasnt that. I did research and got the morse code for the ECU and i got a code for a knock sensor. Link to comment Share on other sites More sharing options...
Dannyg Posted July 21, 2016 Author Share Posted July 21, 2016 Couldnt i just unplug the 02 sensor to know if that is the problem or not?? Link to comment Share on other sites More sharing options...
Cuong Nguyen Posted July 22, 2016 Share Posted July 22, 2016 You said thst you already unplugged the o2 sensor and it wasn't the issue. 1 Link to comment Share on other sites More sharing options...
Cuong Nguyen Posted July 22, 2016 Share Posted July 22, 2016 I'm leaning towards knock sensor or bad ground for the maf sensor. It's pretty common. Link to comment Share on other sites More sharing options...
1987caddy Posted July 22, 2016 Share Posted July 22, 2016 Check the MAF wiring. It does that hard bend to connect on the top and clear the codes. You could be getting the knock sensor from the rough running engine. Link to comment Share on other sites More sharing options...
Dannyg Posted July 23, 2016 Author Share Posted July 23, 2016 You said thst you already unplugged the o2 sensor and it wasn't the issue. Yea but im illiterate to motors so i wasnt completely sure if it was an effective way to find out if that was the issue haha Link to comment Share on other sites More sharing options...
Dannyg Posted July 23, 2016 Author Share Posted July 23, 2016 So i checked my MAF and i also saw someone pull the maf sensor plug and the motor didnt die to see if it was bad or not and i did the same to my pathy and it died so im assuming its good. So sadly i am thinking its the knock sensor but i also have still yet to get confirmation that my symptoms are exactly what a bad knock sensor would do. If i drive it often through the day the sputter gets worse and worse but has still yet to leave me stranded thank god lol Link to comment Share on other sites More sharing options...
RCWD21 Posted August 6, 2016 Share Posted August 6, 2016 (edited) We're the plugs black when you changed them? Does it smell like it's running rich or chugging black/ very dark smoke out the tail pipe? If so make sure your coolant temp sensor has a good connection or if it's the original replace it and carefully inspect the connector for it, they can become very brittle due to age and heat. When they go bad they can cause weird issues like this. I had '90 240sx that had one go bad and it initially caused a lean problem and then it went super rich where the car would barely start and I could only drive maybe 15 to 20 mph wide open. To find the sensor I'm talking about follow your upper radiator hose towards the engine, once you reach the metal pipe there are two sensors on the right side of it facing the driver side. One has one spade connector on it. That's for your temp gauge in the cab. The other has, I believe a yellow, 2 wire connector with a metal retainer clip. That is the sensor you're after. They range anywhere from $15 to $25 depending on where you go. If there is a bad connection there your ecu won't be getting a proper signal so it won't know what temp your engine is actually at so it will cause the ecu to either deliver more or less fuel depending on what it sees. Also these rigs aren't too picky about the knock sensors, which are a PITA to replace since they're under the lower intake manifold on the back side of the engine attached to the block. My 90 pathfinder that I used to have had a bad knock sensor and it didn't affect anything that I noticed except for throwing a code for it. Edited August 6, 2016 by RCWD21 Link to comment Share on other sites More sharing options...
EscuderoTerrano Posted August 22, 2016 Share Posted August 22, 2016 This happened to my Z24 when the engine was just newly started and still cold. Even how fast or slow I floor the gas, the engine just bogs down straight dead. This happened for days, then someone noticed oil leaks. I just found out that the engine oil level is really low. I added temporarily added oil and it fixed the issue. I hope this helps. Link to comment Share on other sites More sharing options...
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