1996 Nissan Wingroad engine surges

1996 NISSAN WINGROAD
62,000 MILES • 1.8L • 4 CYL • AWD • AUTOMATIC
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DONHO1959
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When cruising at approximately 75 -90 km per hour the engine continually surges for a few seconds at a time with an increase of 2-400 RPM.It does not appear to do this at idle or while under acceleration. Thus far I have changed the spark plugs (which seemed ok) with no change.
Nov 11, 2015 at 10:45 AM
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MHPAUTOS
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TRy replacing the fuel filter, it may be restricted,
Nov 12, 2015 at 3:42 AM
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DONHO1959
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The fuel filter was changed 15,000 mi. ago.
Nov 12, 2015 at 10:47 AM
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MHPAUTOS
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You may have contaminated fuel, check the filter as a precaution anyway, are thete any codes set, check for vacuum leaks as well.
Nov 12, 2015 at 3:18 PM
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DONHO1959
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Never thought about contaminated fuel as this has been going on for a few weeks. Have switched to 95 octane fuel. No codes or warning lights, no vacuum leaks. Have cleaned the MAS sensor and added some injector cleaner to the fuel.
Nov 13, 2015 at 1:35 PM
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MHPAUTOS
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Sounds very fuel related, do not take anything for granted, re check filter and check fuel sample, if unsure of fuel take a sample to a mechanic for an opinion, also check fuel rail pressure.
Nov 13, 2015 at 5:34 PM
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