Question about 1997 Nissan Pathfinder

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Nissan Terrano Chugging

My nissan terrano chuggs when it goes up a hill, like its missing. it happens all the time. theres no loss of power.

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When you are going up a hill, the engine is under an incresed load - requiring more fuel and spark, so I'd first check all of the ignition related items (Plugs/wires/cap/rotor), and it isn't a bad idea to replace the fuel and air filters if you haven't in a while. Once those are checked, it is very very common for a TPS (Throttle Position switch) to develop "dead spots"; where under accelleration they cause a "chugging", which sometimes is quite unnoticable - unless/until vehicle is under a load ( eg. driving up a hill). A new TPS can be installed and set with a multi-meter - probes attached to the proper terminals, and have the output voltage set at .47V to .50 V at idle (Closed throttle). I'd bet this is the cause, as they usually do not set a DTC (Code - Service Engine light) . It isn't 100% for sure, an air flow meter and/or other things can cause this type thing as well (also a weak spark or coil, etc), but highly unlikely - other malfunctioning parts often set trouble codes as well, and usually either malfunction or they don't. Hope this helps and if you find anything else - please let me know.
DD

Posted on Jan 28, 2009

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