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Quest Nissan Quest Discussion Forum

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  #1  
Old 03-15-2008, 01:28 PM
tomcanard
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Default Surge on deceleration

1995 Quest, owned since new, 202,805.1 miles, original engine and trans, never removed, never wrecked, still gets 22MPG highway mileage, Well maintained no codes from the OBD.

For the last 50K miles:

Upon deceleration from highway speeds above 65 mph, as van freely decelerates (not braking) through 60mph downward through 50 mph, experience 300-500rpm surging at 1.5 second intervals, which dissipates as speed gets below 50mph and is gone by 40MPH (at least not noticeable).

Surging is worse in hotter (summer) outside air temps.
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  #2  
Old 03-15-2008, 05:02 PM
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mpe235 mpe235 is offline
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2015 Rogue
 
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You may want to try a fluid change. It is somewhat of a risk changing the fluid at that high of mileage because I have seen some very high mileage transmissions just stop moving after a fluid change but your problem may be just fluid that is breaking down. Of course at that mileage it is possible that you have a transmission that is getting worn out.
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  #3  
Old 03-15-2008, 05:38 PM
tomcanard
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Do the fluid change at regular18mo intervals ago- no change.

No slipping. No gear hunting. Acceleration downshifting then up-shifts as it should.

Seems if I maintain ever so slight gas pedal pressure when coasting/decelerating, it won't surge.

When it is surging, seems you can feel it push against the torque converter at peak rpm gain. Then is rolls off smoothly. I get about 5 cycles of this when costing on flat road to a stop between 60-50 mph. It will do more cycles over a longer time frame if coasting/decelerating downhill.

Surge with overdrive on and off

If you put it in neutral while coasting rpm spools down to idle cleanly.
?

Last edited by tomcanard; 03-17-2008 at 02:04 PM. Reason: add data point
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  #4  
Old 03-16-2008, 09:56 AM
tig
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tomcanard,
our 98 with only 90k miles has the same surge and is slow to decelerate. please post your solution if you find one.

tig
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  #5  
Old 03-16-2008, 11:30 AM
tomcanard
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Just some more background:

Same surge pattern with cruise control disconnected.
02 sensor changed last year- no difference.

Could not find any vacuum leaks but changed all lines under the hood anyway out of guilt.

Been chase this one for a while.

Wondering if EGR valve could be modulating?

I'm at the point of changing parts in sequence, thinking
PSP Switch
IAC/AAC
EGR Valve with BRT Valve And Control Sol Valve

Don't want to put a ton of money into it anymore. We're well past the point of diminishing returns.

More interested in keeping it going until something catastrophic pops just to see how far it'll go! Surge is more annoying then anything else.
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  #6  
Old 03-22-2008, 06:49 PM
tig
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After searching the web, i am going to check out the egr valve.
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  #7  
Old 07-12-2020, 03:09 PM
385ford 385ford is offline
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1995 Pathfinder
 
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1995 nissan pathfinder ok then trans lihht comes on and wont down shift
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