Question about 1998 Land Rover Discovery

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Disco 1 engine surges 650 up to 1200 back down to

99 disco 1 engine surges 650 up to 1200 back down to 650 also when driving it doesnot want to down shift loses momentum then regainspower todrive at higer speed.

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Sounds like idle control valve or throttle position sensor. It could also be the engine ecu is faulty but the other 2 issues should be looked at first as they are less expensive to address if you are going through a process of elimination. I would suggest taking it in to have it properly diagnosed by a competent mechanic. try rovercannibal.com for parts when/if you need.

Posted on Mar 20, 2009

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While driving my jeep seems to be shifting gears the rpms rev up and then goes back down almost as if surging I changed speed sensor as a guess so far but did not work?


old 1995
we need vastly more symptoms then that,sorry
if the engine surges, that is first. (surges in 1 gear)
but if a transmission down shifts that is normal, rpm rises
(after all its a lower gear) (higher numeric ratio)
find any machanic in town
ask him test drive it.!
10 min.later he wilt tell you
its trans issues.
or its engine, super easy this is driving.

seems you can not, and learning is 1hour in car class..or 10x that lacking facts of drive train functions.


stop guessing. why spend cash on a useless sensor now.
spend cash on $1 shop diagnosis and WIN.
i promise !

or get it scanned.
and post all those DTC errors. P0700? and more.

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