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RPM gauge needle jumping a little in 97 Freightline classic

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Tomek373, Jan 21, 2022.

Jan 21, 2022 #1

Tomek373 Bobtail Member

22

5

Mar 12, 2021

0

Hello I got 1997 Freightliner classic with 12.7 Detroit and I realized my rpm gauge jumps… it’s a very small movement around 2 millimeters but I still notice it.. is that normal or could there be problems cooking slowly ? It does it both at idle ( unless I bump it up to 900 rpm then it’s steady) and when driving

Tomek373, Jan 21, 2022

Tomek373, Jan 21, 2022

#1
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Jan 21, 2022 #2

Kalaramna Bobtail Member

2

1

Jan 21, 2022

0

That’s called surging. Happens because of fuel quantity valve. Not to worry it won’t damage your engine

Kalaramna, Jan 21, 2022

Kalaramna, Jan 21, 2022

#2

Tomek373 Thanks this.
Jan 21, 2022 #3

Slowpoke KW Road Train Member

1,170

12,819

Dec 7, 2015

OK

0

Could just be the tachometer itself

Slowpoke KW, Jan 21, 2022

Slowpoke KW, Jan 21, 2022

#3
Jan 21, 2022 #4

BRD TRANSPORT Light Load Member

172

63

Jul 6, 2018

0

Hapoend to me still dose.
New sent u it, yoke I 8versal and Guage from peterbilt.
Don't sweat details buddu.

BRD TRANSPORT, Jan 21, 2022

BRD TRANSPORT, Jan 21, 2022

#4

Tomek373 Thanks this.

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