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-   -   Stumble troubleshooting advice (http://www.infamousnissan.com/forum/showthread.php?t=45154)

Deerhurst 02-25-2021 05:51 AM

Digital meters have a tendency to smooth things out I always try to keep an old simpson on hand because analog cannot be replaced sometimes

KivPanther 03-01-2021 04:25 PM

I couldn't notice a definitive dead spot on the digital meter, but I DID notice that I could consistently get the engine to start doing the stumble parked under no load if I veeeery carefully held the accelerator at just the right spot. Coincidentally, the same spot I usually cruise at. I'm thinking you've nailed it, Deerhurst, and my TPS has a worn out spot. I'll report back once I've had a chance to install the new one.

KivPanther 03-09-2021 07:02 PM

No dead spot, but the wide open throttle position sensor wasn't working so I went ahead and replaced the TPS anyway. Haven't had a chance to test it under cruise yet but it does seem that the throttle response is a bit smoother. Will report back after some highway cruising today.

KivPanther 03-09-2021 11:21 PM

Started out fine but stumble returned on the highway. It is still much more muted than before, but I’m back to square one.

KivPanther 04-05-2021 02:03 AM

On a hunch I removed and thoroughly cleaned the Mass Airflow Sensor. The stumble is just barely noticeable now. Still hunting down the final cause, but it's looking like whatever it is was being worsened by a bunch of other stuff I've been tweaking.

KivPanther 06-12-2021 06:56 PM

So, update. The stumble hasn't gone away. In fact, it's pretty noticable now.


The fuel pump, all injectors, pressure regulator, fuel filter, fuel lines, air filter, all six spark plugs, spark plug wire, ignition coil, distributor, throttle position sensor, and the entire exhaust system have all been replaced with new components. The only things that are still stock (and tested working supposedly) are the MAF and coolant temperature sensors.


Since there is sometimes a noticable clunk from the rear end when taking off in 1st gear I'm wondering if maybe I'm barking up the wrong tree and should be looking for something worn out in the drivetrain. It has a new carrier bearing and the driveshat doesn't seem to have any play in it. Any thoughts along those lines?


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