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Old 01-16-2021, 03:51 PM   #1
Pj02807
 
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Default surging from 1800-2200 rpm

I recently bought a 1995 Nissan hard body with the 2.4 for $300 bucks that had been sitting in a yard for years, it had a intermittent no crank and various electrical problems that turned out to be a bad ground. now that that's fixed its time to tackle a new problem that's driving me nuts. the truck has like a dead spot in the throttle from 1800-2200 rpm it will just bounce around that rpm till you get past it or back off the throttle like a rev limiter, past the dead spot or before it it runs great it does this hot or cold and the truck runs great other than that. I did the usual plugs, wires, cap, rotor , fuel filter and fuel cleaner, I cleaned the maf and the throttle body, it also has a new tps sensor but I'm told you have to calibrate a new tps......not sure how. i also read in the forums that there could be a bad crimp connection in the engine wire harness so i tore that apart and re did all the crimps with no change. I'm not sure where to go from here, I have heard a lot of problems can come from the emissions systems on these trucks maybe I should delete all that crap? the evap canister, egr, cat. any help would be much appreciated.
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Old 01-16-2021, 04:29 PM   #2
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Are there any codes from the ECM?
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Old 01-16-2021, 04:55 PM   #3
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check engine light is on but this truck has obd1 and im not sure how to pull the codes on it
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Old 01-16-2021, 05:42 PM   #4
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CEL is emissions related.





Look in the D21 section for the blinky lights tutorial.
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Old 01-17-2021, 04:00 AM   #5
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On mine, there was a slight ignition miss when accelerating through about that RPM. Turned out to be a failing injector.
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Old 01-17-2021, 05:05 AM   #6
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Download the Factory Service Manual and start at EF & EC-58. This page shows the Diagnostic Trouble Code numbers and how to read the flashing red and green l.e.d.'s

Be certain to replace all of the small vacuum hoses ONE BY ONE. As NOT to get a connection incorrect. You mentioned the truck has been sitting for a while in a yard. So know that those small rubber hoses WILL deteriorate over time and create a vacuum leak and those hoses ARE part of the circuit. To also include the metal tube "gallery" (metal tubing that the small rubber hoses attach to). This gallery of tubes can become clogged with condensation when it dries and can leave a white flaky residue that can clog the pipes.

https://www.nicoclub.com/service-man...F1995%2FEC.pdf
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Old 02-19-2021, 02:15 PM   #7
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I have a 95 hardbody 2.4 that had the very same issue.. I replaced EVERYTHING. NOTHING changed until the very last thing I replaced which was the ecu.
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