sorry another 2.1 problem

[bigdubber]

local guy bought a german t25 westy 2.1 auto
running on 3
changed plugs dizzy rotor oil , filters
runs on 4 now
but revs up and down .had spare air flo meter and still the same.
checked manifolds for leaks with spraying wd40 on all intake lines and just the same.
any ideas...and timing at tdc.

[Aidan]

idle control system

DJ or MV ?

[Ian Hulley]

idle control system

The Sierras/Granadas with Bosch injection had that fault too.

[bigdubber]

mv engine

[bigdubber]

where would i look for the idle control system ?

[Aidan]

get a copy of Bentley manual and follow the procedures, MV is fully covered in that, or download Vanagon Solving Driveability Issues manual off the internet, simple enough generally to diagnose but you need to know what's what especially on a new purchase cause p.o. could well have bodged it to get it running and flogged on

[bigdubber]

did compression test and 3 cylinders showing 120 bar one cylinder showing 0 to 15 bar .....erm

[Aidan]

so rocker cover off and see what's what on that cylinder valvewise

[HarryMann]

Yup, could be valve clearances/ hydr tappets up swanney? Could be valve burnt, or rings. Unlikely rings at that low pressure so maybe just head/off on as Aidan says, take a quuik looksee

[bigdubber]

Ok
Took rocker cover off to find adjusting screw off one of the rocker arms just lying in the. Cover and a locking nut half way down another pushrod tube.
Its destroyed end of push rod and the hydraulic valve lifter come out in bits. Next question. Anyone got a hydraulic valve lifter and pushrod for sale. 2.1 mv auto

[HarryMann]

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