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On the ignition timing for 97 Pathfinder

 
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Keephergoing



Joined: 14 Mar 2019
Posts: 4

PostPosted: Thu Mar 14, 2019 5:00 pm    Post subject: On the ignition timing for 97 Pathfinder Reply with quote

My first post so I apologize if it’s in the wrong place or in anyway redundant.

Just got through replacing the driver side valve gasket and a few other bits and pieces. Since I had to pull the distributor to make room to remove the valve cover I thought I would verify the timing. I indexed it fairly anally so all was good but I have question about the procedure just out of curiosity.

In the FSM it states, after warming up the engine, to hold the revs at 2000 rpm for 2 minutes and then to blip up to 3000 three times. What is the purpose of this since the engine is already warm? Is it to trigger some ECU function or to set the fuel/air mixture to a certain level?

Many thanks if you’ve made it this far!
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smj999smj
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Joined: 22 Jan 2012
Posts: 5058
Location: Prospect, VA

PostPosted: Fri Mar 15, 2019 2:05 pm    Post subject: Reply with quote

It doesn't trigger any function in the ECM. It's done to make sure the throttle plate is completely seated. After that, you turn off the engine, unplug the TPS and restart the engine. The vehicle is now is timing set mode, which allows one to adjust the ignition timing and base idle without have any inputs to the ECM influence the readings. Once the timing and base idle are adjusted, the engine is turned off and the TPS harness connector is re-connected to the TPS.
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2006 Pathfinder LE VQ40DE AWD, aftermarket radiator, Airlift 1000's, Bilstein HD rear shocks, Doug Thorley shortie headers and mid-pipes, Magnaflow 12580 muffler, aFe Momentum GT CAI w/ dry filter, XTP plenum spacer, Superchips Flashpaq tuner
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Keephergoing



Joined: 14 Mar 2019
Posts: 4

PostPosted: Sat Mar 16, 2019 11:11 am    Post subject: Reply with quote

Thanks for your reply mate.
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