Range Rover stuttering
Spike
40000 miles it has had a persistent stutter (acutually violent stuttering)
and has been to the Land Rover garage about 14 times, but to no avail. Some
people say that the ECU is at fault, and it is cutting the fuel to the
engine, but if this is not the case it is expensive to fix.
It is not fuel types, plugs, distributor, leads, fuel pump, throttle switch,
brakes.
Has anyone has this problem before at all?
Spike
Pete Lucas
Many [all?] Rover V8's have a special oil-pressure switch that cuts
the fuel-pump if the oil pressure falls. Idea is to deactivate the
pump if the engine stalls. If you've got a bad contact in this
switch or its' associated wiring/relay, it can cause the fuel-pump
to go haywire and cause all sorts of wierd effects. Took me a day
to work this out the first time it happened to me on a SD1.
//PJML//
scmarwod
the purpose of this switch is two-fold. One, as you say to shut the pump
down if you stall, and two, to protect the engine. If you lose oil pressure,
the switch turns off the fuel pump, thus shutting the engine off so that
inattentive people who miss the low oil pressure warning light, won't be
able to keep driving and ruin their engines. You might even find that there
is a switch connected to your coolant temperature sensor that will also shut
off the fuel pump if the engine runs too hot. Standard equipment on modern
tractor-trailers in North America. It can be a bit annoying at times,
because on the big trucks they also include one that shuts the engine down
if your coolant gets a little low in the reservoir, but I've found it to be
an engine saver.
Spike, you might want to add that to the list Pete gave you of things to
check.
Good Luck
-Stephen-
Pete Lucas wrote in message
<36D668...@not-for-mail.nerc-swindon.ac.uk>...
hibberd
problems.
Does it stutter cold, warm or both?
Roger
Spike heeft geschreven in bericht <7b4itv$9ot$1...@phys-ma.sol.co.uk>...
Spike
of 80000 miles.
Also, this is not a constant problem. Sometimes it stutters, and then left
for 15 mins and started again it wont stutter.
It never stutters the week after new plugs and leads have been fitted.
Its too violent to be the engine shutting down, uncless the running gear has
huge friction and resistance. (maybe it does)
It only does this under hard acceleration, especially up hills
That help?
Spike
scmarwod wrote in message ...
Andrew W. MacFadyen
Andy M
Chris Wilson
says...
> well look I think that the garage has prabably checked these over the course
> of 80000 miles.
> Also, this is not a constant problem. Sometimes it stutters, and then left
> for 15 mins and started again it wont stutter.
> It never stutters the week after new plugs and leads have been fitted.
> Its too violent to be the engine shutting down, uncless the running gear has
> huge friction and resistance. (maybe it does)
> It only does this under hard acceleration, especially up hills
>
> That help?
Given the time and money thrown at it already,I'd take it to a rolling
road that can accommodate 4WD vehicles,and have it run upp until it
shows the problem.The diagnostic gear will show if it's fuel or
ignition.Sometimes V8 disis will create enough ozone within the cap to
cause cross firing.You might try removing the cap and refitting,to see
if it kills the problem.If it does,drill some vent holes in the side
of it.The last idea is a remote possibility,but checking is free :-0
--
Best Regards,
Chris Wilson
http://www.f3.u-net.com
mailto:ch...@f3.u-net.com
Spike
Sometimes It also has an uneven idle. The revs jump from 1000 to 2000 and
back in asmooth pattern every 2 seconds. could this help you guys. I dont
think its the wrong plugs, the Land Rover garage would certinally have put
the correct ones in.
Spike
hibberd wrote in message <7b6trh$4b6$1...@reader1.wxs.nl>...
hibberd
got a sticky lifter and or that the Cam is worn. Its ood that the engine hunts like that
has
the old girl got a cat and the lambda sensor is cream crackered?
Spike heeft geschreven in bericht <7b76r1$sb6$1...@phys-ma.sol.co.uk>...
Andrew W. MacFadyen
water out ! it worked :-)
Andy M
Tom
"Spike" <maca...@cyberdude.com> wrote:
> We have a 90 G rangerover 3.9 manual with 125000 mils on the clock. Since
> 40000 miles it has had a persistent stutter (acutually violent stuttering)
Forgive me I'm not acquainted with Land Rover engines (yet), but
I had similar problems on an engine of mine recently. Turned out
one of the injectors had gone mad. Symptons were: sometimes violent
stuttering at lower revs under load. It was a straight-6 and the
garage told me it would be expensive to track down and fix. I
imagine it would be worse on a V8.
Tom.
---
Tom - t...@buena-vista.freeserve.co.uk
http://www.buena-vista.freeserve.co.uk
http://www.java-stuff.freeserve.co.uk
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Dave
<maca...@cyberdude.com> wrote:
>
> We have a 90 G rangerover 3.9 manual with 125000 mils on the clock. Since
> 40000 miles it has had a persistent stutter (acutually violent stuttering)
> Some
> people say that the ECU is at fault, and it is cutting the fuel to the
> engine, but if this is not the case it is expensive to fix.
Not sure when they changed, but if it has the ignition amp. on the side of
the distributor, that's a prime candididate for misfires. Had a new one that
was intermittent.
--
Dave dave....@NOSPAMargonet.co.uk
(remove NOSPAM to reply)
Graham
wrote:
>We have a 90 G rangerover 3.9 manual with..........
Is it hot wire type AFM or flap type?
I assume none cat?
Andrew W. MacFadyen
use the same system ? surely not.
Andy M
Dave wrote:
> In article <7b4itv$9ot$1...@phys-ma.sol.co.uk>, "Spike"
Dave
<am...@post.almac.co.uk> wrote:
>
> I've seen this on early SD1s where the ribbon cable failed but do they
> still
> use the same system ? surely not.
> Andy M
No, late SD1s had the DLM8 dissy same as early EFI RR, and the ignition
module can be intermittent. The LT connections can be suspect also. I would
fit a dwell gauge inside cab and see if it shows anything strange during
misfire.
The same gauge across an injector should show if the ECU's misbehaving.
scmarwod
you paying each time you go in, or are they working on it gratis?
Never mind that now, though.
Spike, it actually sounds an awful lot like your plugs are either set at the
wrong gap, or are set at different gaps. That would give you all the
symptoms I've read so far.
Nothing for the first week after plugs and wires changed
Stuttering under load (both hot and cold)
Uneven idle
I've experienced all these symptoms when I've not paid attention to what I
was doing and didn't set the gap right. And I've yet to find pre-gapped
plugs that actually were, so don't let them tell you they come pre-gapped.
-Stephen-
Spike wrote in message <7b76r1$sb6$1...@phys-ma.sol.co.uk>...
PaulK...@my-dejanews.com
that feeds the engine extra throtle when it is in danger of stalling. It
brings the revs up and then slowly steps back (at the 2 second intervals that
you mentioned) to the normal idle speed. I have a 90 RR 3.9 manual as well,
and I have found that particularly with the manuals this component does seems
to be working against you rather than for you. I'd say it was more designed
to aid an automatic gearbox rather than a manual. It can sometimes cause some
pretty erratic revving in conjunction with the box. However, it seems your
problem is more a fuel feed problem, and the erratic revving up and down is
more the reaction from the stepper motor, because when it notices that the
engine is about to stall (maybe because of fuel starvation), it pushes up the
revs to then slowly step back to normal idling speed. But, might be worthwile
checking out.
B.T.W How do you find the manual gearbox? I have had my car now for nearly a
year but I am not impressed with the ratios. They are too short. 1st gear is
nearly obsolete...
Paul
In article <7b4itv$9ot$1...@phys-ma.sol.co.uk>,
"Spike" <maca...@cyberdude.com> wrote:
> We have a 90 G rangerover 3.9 manual with 125000 mils on the clock. Since
> 40000 miles it has had a persistent stutter (acutually violent stuttering)
> and has been to the Land Rover garage about 14 times, but to no avail. Some
> people say that the ECU is at fault, and it is cutting the fuel to the
> engine, but if this is not the case it is expensive to fix.
>
> It is not fuel types, plugs, distributor, leads, fuel pump, throttle switch,
> brakes.
>
> Has anyone has this problem before at all?
>
> Spike
>
> --
> http://rennie.future.easyspace.com
>
>
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