Keeps Cutting Out ! - MG-Rover.org Forums
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post #1 of 29 (permalink) Old 22-02-2006, 18:26 Thread Starter
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Keeps Cutting Out !

Hi Everybody!!
Just a short question. I have a Rover 420, petrol, 1996. SOMETIMES when we pull up at a junction, slow down etc. the rev counter will dip below 'idling' revs and consequently peeter out. It happened last winter BUT appears not to affect the car during the summer....bloody thing!!

Any ideas??
Cheers
Videoman
svp@avhouse.fsnet.co.uk

Last edited by Videoman; 19-06-2006 at 08:30.
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post #2 of 29 (permalink) Old 22-02-2006, 18:35
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Hi - try the 'ask the gurus forum' - lots of clever bods in there I'm sure can help you
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post #3 of 29 (permalink) Old 22-02-2006, 18:40 Thread Starter
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Cheers...new to this comupter lark !! Good aint it ?!
Come on my missus is threatening me with buying a Seat !!!!

Last edited by Videoman; 22-02-2006 at 19:39.
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post #4 of 29 (permalink) Old 22-02-2006, 20:25
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Quote:
Originally Posted by Videoman
Hi Everybody!
Just a short question. I have a Rover 420, petrol, 1996. SOMETIMES when we pull up at a junction, slow down etc. the rev counter will dip below 'idling' revs and consequently peeter out. It happened last winter BUT appears not to affect the car during the summer....bloody thing!!

Any ideas??
Cheers
Videoman
svp@avhouse.fsnet.co.uk
aaarrrr I had this the other day, large bottle of redex, some decent fuel, new air filter and a good thraping up the motorway and touch wood it hasnt happened since
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post #5 of 29 (permalink) Old 23-02-2006, 11:59
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i've had exactly the same ... cuts out EVERY time i push the clutch though and it's getting mighty annoying.
also there are times (quite rarely now) it goes completely the other way and will rev at anywhere between 2500 - 3500rpm, therefore i'm constantly braking as i catch up with cars in front of me without even touching the accelerator!
i've put in a bottle of redex but no different, and i've tried the stepper motor reset on a number of occasions and no change there either.

i've had the car into the garage i use but all their equipment tells is that there is a 'throttle problem' ... hmmm ... told them that when i put it in.

i contacted a garage that has the Rover test equipment and they are quoting between 60 - 100 just to run the diagnostic!!
pretty cheesed off with that as they will then probably try and rip me off for the repairs too.

it's not like i do constant short journeys either ... it's 25 miles on a very quick road each way to work every day.

is there anything anyone can suggest that i try?
i'm getting a Haynes manual this weekend so prepared to have a bit of a go at something within reason.

cheers


**edit**
forgot to mention, it's a 420SLi 1997

Last edited by the_womble; 23-02-2006 at 12:18.
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post #6 of 29 (permalink) Old 23-02-2006, 12:32
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add me to the club. I think it has to do with a sensor...
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post #7 of 29 (permalink) Old 23-02-2006, 13:02
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Me too!!! (96 216 Coupe)
I just can't afford to take it to the garage as it cost's me every time they 'fix' it, only to find it's still the same!! Typically though, it's always running fine whenever I get to the garage.
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post #8 of 29 (permalink) Old 23-02-2006, 17:28
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Cant say Ive ever had this happen on mine, but would be interested to hear of anyone who can resolve the above posters problems, for future reference?
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post #9 of 29 (permalink) Old 23-02-2006, 17:54
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it does it more often when I turn the AC on in my car at low revs.
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post #10 of 29 (permalink) Old 23-02-2006, 18:00
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could it be the alternator anyone? if he says it happens when he turns the ac on.....
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post #11 of 29 (permalink) Old 23-02-2006, 18:24
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Seems more like a throttle position sensor problem or IACV problem. The ECU will adjust the revs to stop the car stalling based on the information it gets from the TPS and alters the IACV based on this info. If this info is incorrect from a bu&&ered TPS it may not adjust the revs properly and cause the engine to cut out by under fueling, incorrect IACV e.t.c. when deccelerating.

I'd change the TPS first and then try the IACV.

Last edited by ashy; 23-02-2006 at 18:35.
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post #12 of 29 (permalink) Old 23-02-2006, 19:30
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coolant temp sensor
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post #13 of 29 (permalink) Old 23-02-2006, 23:19
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ok, cheers for the replies ... have to check at the weekend to see where the sensors are located.

any idea if these are likely to be within reach without getting too deep into it or are they a bit fiddly?
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post #14 of 29 (permalink) Old 24-02-2006, 00:23
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my old 214 used to rev right up to the limiter in the rain all on its own! (it died shortley after) glad i sold it first though lol
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post #15 of 29 (permalink) Old 24-02-2006, 01:26
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the diagnostic can locate which sensor is failing for sure?
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post #16 of 29 (permalink) Old 24-02-2006, 13:50
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Quote:
Originally Posted by Tad
the diagnostic can locate which sensor is failing for sure?
don't doubt that but i don't like the idea of it costing 60 - 100 just to find out it's a 5 - 10 sensor ... rather try a couple of things first if i can
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post #17 of 29 (permalink) Old 24-02-2006, 16:37
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Problems like this are hard to source as it could be a number of things or maybe a couple together. You could replace allsorts and not find the problem. Best get it on a T4 or someone with the AVON kit ( a few on this forum have the kit) and you'll find out what it is straight away.

Last edited by ashy; 24-02-2006 at 16:42.
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post #18 of 29 (permalink) Old 26-02-2006, 10:49
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well i got my Haynes manual and thought i'd have a quick butchers under the bonnet ...

when i disconnected the Throttle Position Sensor the car ticked over on it's own!! ok, so it was still a little erratic, but it was all on it's own without me touching the accelerator, so i am possibly thinking this could be a main part of the problem (thanks ashy).
now, if i were to drive my car with this still disconnected, what damage could i be doing, if any?

also, how can i change the connector as it was all wired in and sealed all the way down to where it meets other bits?
can i change literally just the plug?
or
can it be the throttle body itself and not the sensor?


if i disconnected the air cleaner housing from the throttle body, then sprayed possibly carb cleaner into the throttle body and left this to work for a short time, would i be doing any damage? is there a certain way of doing things to clean the throttle body out?


**EDIT**
my exhaust downpipe is blowing and getting worse ... will this have any effect on the problem?

Last edited by the_womble; 26-02-2006 at 11:05.
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post #19 of 29 (permalink) Old 26-02-2006, 21:13
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With the TPS disconnected the ECU will revert to a fail safe that may burn a little more fuel but should be safe.

Its not the connector that might need changing, but the sensor itself which bolts/screw onto the side of the throttle body. 40 quid for a new sensor at www.bestofbritishrover.com (0121) 526 5444. If you know someone who has a T series that you could borrow the sensor from then that might help the diagnosis before spending too much money.

A coolant temp sensor from Best of British is under 7 quid and a cheap/easy fix.

Carb cleaner will do no harm - quite the reverse.

However, you may well find that it IS the blowing exhaust because that could affect the readings on the Lambda sensor so I would do that first.
post #20 of 29 (permalink) Old 01-03-2006, 09:20
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well i have a bit of an update ...
my downpipe basically snapped off ... hanging on the floor.
can be see here .. http://community.webshots.com/album/548124389tHFDUT

i now have a new downpipe, new air filter, carb cleaner sprayed in throttle body and then wiped out best i could ... cut out once on the way to work this morning but it was when it was cold, after warming up it seemed to run ok (touch wood).

i'll reserve judgement for now, but things looking up.
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