Question about 1998 Nissan Pathfinder

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After my intake manifold gasket was replaced, my 1998 Pathfinder at a cold start would rev to 1.5K to 2K RPM for about 5+ min. Before the gasket was replaced, it would rev at from 1K to 1.5K for less than a minute. This is only from a cold start and worse on a cold day. Sometimes it will float between 1.5K and 2K when cold. Could it be the IACV? Do youknow what the problem is?

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Better check your intake gasket bolts for tightness, and all your vacuum lines and connections. It's probably a vacuum leak.

Posted on May 09, 2009

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High Idle at Start Up


This sounds like the RPM may be a little high, but normal operation is called a "cold start routine". Like the old fashion Choke, the "cold start routine" is suppose to increase the RPM for several minutes and then decrease to running idle speed. This will engage in each "cold" start, but not on a warm engine. It is designed to do this.

Usually when an engine runs higher RPM than it is set for, it means extra air is entering the engine from somewhere. Using a spray water filled bottle, go around seams and also spray vacuum lines and the EGR pod while the engine is running. Any openings will draw in the water and affect RPM. Then you will have found the leak.

Now you can look up you exact engine on the Web and find out 2 things. If it has a 2 piece intake manifold and if it has intake Manifold runners. The 2 piece design often failed when the gasket holding the 2 halves started dissolving. The intake runners, could stick out of position and make RPM higher.

Now aside from these 2 items, you might get a Code showing that the engine is running lean. This would actually not be showing the lack of fuel, but the overabundance of air coming from the leaks.

Jan 30, 2014 | 2005 Ford Escape XLT

1 Answer

I need to replace the knocking sensor on my 1998 nissan pathfinder. Can you please guide me?


to replace a knock sensor on a 1998 pathfinder is a big job.
you have to take out the whole intake manifold, so you can reach the sensor.
if you want to do it by yourself \, first you should have ready all the tools and parts.: including a torque wrench and a set of intake manifold gaskets. you can try here autopartsway.ca for some good cheap parts.
and be ready to work few hours if you do not have much experience as a automotive mechanic.
so, good luck, if you did not do it already.

Aug 26, 2010 | 1998 Nissan Pathfinder

2 Answers

Im haveing engine problems with my 91 pathfinder and cant seem to figure it out. it runs fine when i first start it up but after i drive it more then a few miles it starts sputtering and back firing when i...


The major causes of backfires are:

1) Emission control system not fuctioning properly.
2) Ignition timing is incorrect.
3) Faulty secondary ignition system; cracked spark plug insulator, faulty plug wires, distributor cap and/or rotor.
4)Fuel injection system malfunction.
5) Vacuum leak at fuel injectors, intake manifold or vacuum hose.
6) EGR stuck open all the time.

Jul 06, 2010 | 1991 Nissan Pathfinder

2 Answers

Replaced head gasket and now engin revs up 4000


COULD BE A INTAKE MANIFOLD VACUUM LEAK.DID YOU TIGHTEN THE INTAKE MANIFOLD IN SEQUENCE.

May 30, 2010 | 1998 Chevrolet Lumina

1 Answer

Stalling when the car start in cold weather


It could be the idle air control valve, this sit right on top of the intake manifold (plenum). It's held in place with 2 bolts and 1 plug with 2 wires going to it. When you first start engine does it rev up a bit then settle down? If so the idle air valve is probably OK. It could also be intake manifold gaskets if they have never been changed and the vehicle has over 100,000 miles on it. That's probably what's going on, in cold weather the gaskets shink up and don't seal causing the engine to stall. It's not too bad of a job to change those gaskets on that vehicle, my son had a 1998 Explorer and it seems to me, it only took me a couple hours.

Dec 13, 2009 | 1998 Ford Explorer

1 Answer

How to replace a knock sensor on nissan pathfinder 1998


It's located deep in the valley! Under the "LOWER intake manifold". copy and paste this link in your browser, or try clicking on it. It may be helpful to you.

http://x.nissanhelp.com/forums/pathfinder/7890-3-3l-knock-sensor-relocation.html

I didn't find this link until after I had already disassembled my truck. This is the hardest job that I've taken on thus far, hope I can put it all back together properly. I changed the gaskets on the valve covers since I had everything off.
To answer your question: It's under your lower intake manifold, so it's a hard job!

Oct 15, 2009 | 1998 Nissan Pathfinder

1 Answer

Cylinder #2 Misfire-after intake manifold replaced


It's possible he has two plug wires crossed, or pulled a spak plug wire apart replace #2 spark plug wire First. To test check the firing order and make sure all the wires on the right plugs and the correct place on the distributor, if it is right, then buy a can of carburator cleaner and spray around the intake gasket if the engine revs up when you spray the carb cleaner around the intake manifold with (engine running) if the engine rpm revs up you have an intake leak.

Jul 03, 2009 | 1997 Chevrolet Tahoe

3 Answers

98 Isuzu Trooper stalls on cold start, idle issues..


I had the same issue on my 99 Trooper.

It would usually start when completely cold, but idle around 2k RPM.
It would drive fine. But if I shut it down, ran into a store, and came back out, it would start but immediately idle.
Had to ride the gas a little to get it into gear.
The Check Engine light has been going on and off for 6 months or so.

I took this to my local trusted repair shop (no Isuzu dealers within 200 miles).
The diagnosed the light, and found that the Intake Gaskets were bad or leaking.
The idling problem was related to the car not being able to control the amount of air coming in.

They replaced the Intake gaskets by the next day, and I haven't had a problem since. And no more check engine light, which has been on half a year.

Here's some details from my bill:
(1) Intake Gasket set $107.95
Misc materials $21.00
2.1 hours of Labor

The total cost to me was $345.00, and I definately don't feel gipped.

Jan 06, 2009 | 1999 Isuzu Trooper

3 Answers

2002 GMC Yukon, erratic idle(hi-low) when cold. 125K miles.


i now for a fact that it is the egr valve . carbon balls in side you have to take it of and clean them out

Nov 17, 2008 | 2002 GMC Yukon Denali

3 Answers

STARTS ROUGH IDLE AND WILL ONLY ILDE FOR ABOUT 30SEC


sounds like a fuel delivery problem. try cleaning carb.

Aug 07, 2008 | 1998 Mazda 626

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