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Periodic rev drop

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07 Apr 2019 17:27 #205667 by Piet
Periodic rev drop was created by Piet
Hi,

just came back from a ride and I noticed that the engine revs dropped periodically when waiting for traffic lights. The thing is that it only happens when the car is in D mode (I have an automatic gearbox in a Jimny from 1998). I can see the lights dimming a bit before the revs up again and the lights go brighter. This does happen every few seconds, but no discernible pattern could be found. Does someone know what the problem could be? I just had a total gearbox overhaul (which was quite costly) and wouldn't want that again...

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07 Apr 2019 17:41 - 07 Apr 2019 18:59 #205668 by GeorgeC
Replied by GeorgeC on topic Periodic rev drop
Air Conditioning compressor cycling on/off.

I drop my Jimny into "N" neutral when waiting at lights. :)

"Nobody expects The Spanish Inquisition."
www.aveoforum.com/forum/f118/seniors-jim...-suzuki-jimny-23477/
Last edit: 07 Apr 2019 18:59 by GeorgeC. Reason: comp.

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07 Apr 2019 18:30 #205669 by Cremator1
Replied by Cremator1 on topic Periodic rev drop
Has it got A/C

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07 Apr 2019 18:36 #205671 by Piet
Replied by Piet on topic Periodic rev drop
Yup, it got A/C, but I am pretty sure it was off this afternoon.

@GeorgeC, hmmm, that is also an option ;)

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07 Apr 2019 18:37 - 07 Apr 2019 18:40 #205672 by Cremator1
Replied by Cremator1 on topic Periodic rev drop
If it was on it would be that I have auto and also pop mine in to N if sitting at lights or for along time
Last edit: 07 Apr 2019 18:40 by Cremator1.

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08 Apr 2019 05:17 #205683 by kirkynut
Replied by kirkynut on topic Periodic rev drop
Why not put it in Park. That's what you ought to be doing!

Kirkynut

The underdog often starts the fight, and occasionally the upper dog deserves to win - Edgar Watson Howe.

My Jimny Thread Here: www.bigjimny.com/index.php/forum/8-my-ji...on-continues?start=0

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09 Apr 2019 16:12 #205764 by Piet
Replied by Piet on topic Periodic rev drop
So I checked today and the AC was definitely off.

It also feels a bit as if the car wants to jolt forward (as if the gear is engaging).

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09 Apr 2019 16:22 #205765 by Cremator1
Replied by Cremator1 on topic Periodic rev drop
On an auto they will move forward when d is selected

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09 Apr 2019 18:34 - 13 Apr 2019 17:02 #205771 by GeorgeC
Replied by GeorgeC on topic Periodic rev drop
After considering this topic: www.bigjimny.com/index.php/forum/7-jimny...il-drain-plug#201187
Re-Check the level of the Auto Trans Fluid. How long since the transmission has had a full service? (Answered below)

I still prefer selecting "N" for lights and short delays in traffic. :) (many reasons)

Edit: I have just had a play with my battery and a look at my tiny alternator, I am now throwing the Alternator/Voltage Regulator and Belt into the discussion mix. These may also be worth a look.

"Nobody expects The Spanish Inquisition."
www.aveoforum.com/forum/f118/seniors-jim...-suzuki-jimny-23477/
Last edit: 13 Apr 2019 17:02 by GeorgeC. Reason: electrical system?

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11 Apr 2019 05:06 #205853 by Piet
Replied by Piet on topic Periodic rev drop
I got the transmission overhauled about a month ago. I'll check the fluids today. Up until now only problems with my jimny transmission... Now the transfer case chain is slipping...

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11 Apr 2019 07:33 - 11 Apr 2019 07:33 #205866 by facade
Replied by facade on topic Periodic rev drop

kirkynut wrote: Why not put it in Park. That's what you ought to be doing!

Kirkynut


Gives the driver behind a panic attack when you pass reverse as you stick it back into drive too. ;)


The Renault Nissan is auto, I just leave it in D all the time and hold it on the handbrake*. If I was stationary for a while I'd turn the engine off.

*I always used to hold autos on the footbrake, but the Renault Nissan has steering so dodgy that holding the footbrake on when the discs are warm deposits a few microns of dust on the disc, and then the steering oscillates lock to lock under braking for evermore, until you buy new discs :evil:

If it suddenly breaks, go back to the last thing that you did before it broke and start looking there :)
Last edit: 11 Apr 2019 07:33 by facade.
The following user(s) said Thank You: GeorgeC

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