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help 93 pathfinder starting rough and idles rough

mooreoffroad

By mooreoffroad,
in 90-95 WD21 Pathfinders

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Precise1 NPORA Old-Timer

Precise1

Posted
Posted

When is the last time it was fully tuned up?? (Spark plugs, cap, rotor, wires)

 

First, go to the Garage section and the pinned topic of Factory Service Manuals and download the 1994 version, it is the oldest one available and applies to 90% of your truck.

Second, check the ECU under the passenger seat for stored fault codes, there is a write up in the Garage/How To section.

Third, clean your MAF element and check the wiring connection (wiggle while running is a good indicator), there is a write up in the Garage/How To section.

Fourth, check the resistance of the O2 sensor with an ohm meter, the values should be in the FSM. Replace if it fails.

Fifth, check vacuum lines for cracks/leaks (I use WD-40. Spray a suspected line while the engine is running, if the idle surges, you have found a leak.

Sisth, check the EGR valve for proper function. Details in the FSM.

 

That should keep you busy for a while and rule out the common culprits. Let us know what you find... ;)

 

B

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k9sar NPORA Old-Timer

k9sar

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Posted (edited)

and, to help keep these forums useful, please post what you find and what fixed the problem if you find it. If you do not fix it, fill us in as to what you find and we'll help you walk through the troubleshooting and eventual (hopefully) resolution.

 

ps. my vote would be the connector on top of the MAF.

Edited by k9sar
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mooreoffroad
NPORA Newbie

mooreoffroad

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and, to help keep these forums useful, please post what you find and what fixed the problem if you find it. If you do not fix it, fill us in as to what you find and we'll help you walk through the troubleshooting and eventual (hopefully) resolution.

 

ps. my vote would be the connector on top of the MAF.

 

Allright i will

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