Nissan Pick-ups and Pathfinder 1989-1995

TUNE-UP PROCEDURES

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See Figures 1 and 2

In order to extract the best performance and economy from your engine it is essential that it be properly tuned at regular intervals. A regular tune-up/inspection will keep your Nissan's engine running smoothly and will prevent the annoying minor breakdowns and poor performance associated with an untuned engine.



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Fig. Fig. 1: Vehicle Emission Control Information (VECI) label located in the engine compartment



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Fig. Fig. 2: Because of the tangle of underhood wiring ALWAYS tag/note wire locations before removal

A complete tune-up/inspection should be performed every 30,000 miles (48,000 km) or 24 months, whichever comes first. This interval should be halved (as a general rule of thumb) if the truck is operated under severe conditions, such as trailer towing, prolonged idling, continual stop and start driving, or if starting or running problems are noticed. It is assumed that the routine maintenance described in General Information & Maintenance has been kept up, as this will have a decided effect on the results of a tune-up.

A tune-up/inspection for models covered in this guide should consists of the following items, but always refer to the Maintenance Interval Chart for additional service information.



Inspect the drive belts.
 
If necessary, check and adjust valve clearance
 
Clean the air filter housing and replacing the air filter element.
 
If equipped, replace the PCV filter and Pulsed secondary air injection filter.
 
Inspect or replace the fuel filter assembly.
 
Inspect all fuel and vapor lines.
 
Check or replace the distributor cap, rotor and ignition wires.
 
Replace the spark plugs and make all necessary engine adjustments.
 
Always refer to the Maintenance Interval Chart for additional service information.
 

If the tune-up specifications on the Vehicle Emission Control Information sticker in the engine compartment of your Nissan disagree with the Tune-Up Specifications chart in this section, the figures on the sticker must be used. The sticker often reflects changes made during the production run.

 
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