bad running RR- Any help appreciated

I

itcosthowmuch

Guest

• Apr 20, 2005

• #1

Any help appreciated !

I have a d reg classic 3.5 auto with fuel injection and am having
problems with long distance cruseing .if im on a road wher I can keep a
constant speed say 50-55mph after about half a mile at a constant speed
the car starts to stutter and slow down , can hear what I think is
petrol going in to the exhaust manifold and getting burnt ie like a
small backfire but only on the passenger side . if I then come to a
junction and stop it runs lumpy coughing and spluttering for about 10
seconds and then sorts its self out and runs fine .


I have replaced the dissy, cap rotor arm , ht leads , spark plugs ,coil
, amp, and some of the ignition wiring


Any idea's ?


Thanks Paul

 

A

Alan Mudd

Guest

• Apr 20, 2005

• #2

might be worth trying a replacement coolant temp sensor, it tells the ECU
how hot your engine is, if this isn't working properly you tend to be
overfueld with the same symptoms, and these are a known problem.

It screws in the top of the block on the right hand side of the extra air
valve as you look at the front of the engine, you'll find two sensors there,
the temp sensor is the rear of the two. Not an expensive part (£12 or so )
and worth trying that before air mass meters and such.

Alan M.

"itcosthowmuch" <[email protected]> wrote in message
news:[email protected]...
> Any help appreciated !
>
> I have a d reg classic 3.5 auto with fuel injection and am having
> problems with long distance cruseing .if im on a road wher I can keep a
> constant speed say 50-55mph after about half a mile at a constant speed
> the car starts to stutter and slow down , can hear what I think is
> petrol going in to the exhaust manifold and getting burnt ie like a
> small backfire but only on the passenger side . if I then come to a
> junction and stop it runs lumpy coughing and spluttering for about 10
> seconds and then sorts its self out and runs fine .
>
>
> I have replaced the dissy, cap rotor arm , ht leads , spark plugs ,coil
> , amp, and some of the ignition wiring
>
>
> Any idea's ?
>
>
> Thanks Paul
>

 

T

Tim Hobbs

Guest

• Apr 20, 2005

• #3

On 20 Apr 2005 04:43:59 -0700, "itcosthowmuch"
<[email protected]> wrote:

>Any help appreciated !
>
>I have a d reg classic 3.5 auto with fuel injection and am having
>problems with long distance cruseing .if im on a road wher I can keep a
>constant speed say 50-55mph after about half a mile at a constant speed
>the car starts to stutter and slow down , can hear what I think is
>petrol going in to the exhaust manifold and getting burnt ie like a
>small backfire but only on the passenger side . if I then come to a
>junction and stop it runs lumpy coughing and spluttering for about 10
>seconds and then sorts its self out and runs fine .
>
>
>I have replaced the dissy, cap rotor arm , ht leads , spark plugs ,coil
>, amp, and some of the ignition wiring
>
>
>Any idea's ?
>
>
>Thanks Paul

Oh, I've been here.... And back again....

The 101 did this for months and I went through the fuelling and
ignition system (completely replaced both, including fuel pump,
rebuilt carbs, distributor, fuel lines etc etc etc).

I'd have a good look at the inlet manifold. The 101 was pulling air
through there when the engine was hot and under any kind of load, thus
running lean and backfiring then eventually just stopping completely.
10-15 minutes rest and it was OK for a little while, then repeat....


--

Tim Hobbs

'58 Series 2 88" aka "Stig"
'77 101FC Ambulance aka "Burrt"
'03 Volvo V70

 

A

Austin Shackles

Guest

• Apr 20, 2005

• #4

On or around 20 Apr 2005 04:43:59 -0700, "itcosthowmuch"
<[email protected]> enlightened us thusly:

>Any help appreciated !
>
>I have a d reg classic 3.5 auto with fuel injection and am having
>problems with long distance cruseing .if im on a road wher I can keep a
>constant speed say 50-55mph after about half a mile at a constant speed
>the car starts to stutter and slow down , can hear what I think is
>petrol going in to the exhaust manifold and getting burnt ie like a
>small backfire but only on the passenger side . if I then come to a
>junction and stop it runs lumpy coughing and spluttering for about 10
>seconds and then sorts its self out and runs fine .

if it really is only on one side... do the flapper systems fire each bank of
injectors separately, like the hotwire does?

--
Austin Shackles. www.ddol-las.fsnet.co.uk my opinions are just that
Blue: The sky is blue for a reason. Blue light is a source of strength
and harmony in the cosmos. Create a blue light in your life by
telephoning the police
from the Little Book of Complete B***ocks by Alistair Beaton.

 

B

Badger

Guest

• Apr 20, 2005

• #5

"Austin Shackles" <[email protected]> wrote in message
news:[email protected]...
> On or around 20 Apr 2005 04:43:59 -0700, "itcosthowmuch"
> <[email protected]> enlightened us thusly:
>
>>Any help appreciated !
>>
>>I have a d reg classic 3.5 auto with fuel injection and am having
>>problems with long distance cruseing .if im on a road wher I can keep a
>>constant speed say 50-55mph after about half a mile at a constant speed
>>the car starts to stutter and slow down , can hear what I think is
>>petrol going in to the exhaust manifold and getting burnt ie like a
>>small backfire but only on the passenger side . if I then come to a
>>junction and stop it runs lumpy coughing and spluttering for about 10
>>seconds and then sorts its self out and runs fine .
>
> if it really is only on one side... do the flapper systems fire each bank
> of
> injectors separately, like the hotwire does?

Yes, they "bank-fire" Austin. Sounds from explanation like one bank is maybe
overfuelling, but I can't see what could cause that and then sort itself out
again, as all sensors feed the whole engine. If it were an ecu fault, where
there are 2 main power transistors - one for each bank, I'd expect it not to
go away simply after idling for 10 seconds.... It's also possible that the
noise is actually the engine spitting back through the inlet as it's on that
side, and nothing to do with just one bank at all.... in which case it may
be a starvation issue and worth replacing the fuel filter?
Badger.

 

I

itcosthowmuch

Guest

• Apr 21, 2005

• #6

Badger wrote:
> "Austin Shackles" <[email protected]> wrote in message
> news:[email protected]...
> > On or around 20 Apr 2005 04:43:59 -0700, "itcosthowmuch"
> > <[email protected]> enlightened us thusly:
> >
> >>Any help appreciated !
> >>
> >>I have a d reg classic 3.5 auto with fuel injection and am having
> >>problems with long distance cruseing .if im on a road wher I can
keep a
> >>constant speed say 50-55mph after about half a mile at a constant
speed
> >>the car starts to stutter and slow down , can hear what I think is
> >>petrol going in to the exhaust manifold and getting burnt ie like a
> >>small backfire but only on the passenger side . if I then come to
a
> >>junction and stop it runs lumpy coughing and spluttering for about
10
> >>seconds and then sorts its self out and runs fine .
> >
> > if it really is only on one side... do the flapper systems fire
each bank
> > of
> > injectors separately, like the hotwire does?
>
> Yes, they "bank-fire" Austin. Sounds from explanation like one bank
is maybe
> overfuelling, but I can't see what could cause that and then sort
itself out
> again, as all sensors feed the whole engine. If it were an ecu fault,
where
> there are 2 main power transistors - one for each bank, I'd expect it
not to
> go away simply after idling for 10 seconds.... It's also possible
that the
> noise is actually the engine spitting back through the inlet as it's
on that
> side, and nothing to do with just one bank at all.... in which case
it may
> be a starvation issue and worth replacing the fuel filter?
> Badger.

Thanks for the reply's some things I haven't tried yet , bit more
info for you though , its definitely over fuelling as I can smell it
when I stop , I have changed the ecu for a known good one and it made
no difference any further thoughts ?

 

A

Austin Shackles

Guest

• Apr 22, 2005

• #7

On or around 21 Apr 2005 01:56:14 -0700, "itcosthowmuch"
<[email protected]> enlightened us thusly:

>Thanks for the reply's some things I haven't tried yet , bit more
>info for you though , its definitely over fuelling as I can smell it
>when I stop , I have changed the ecu for a known good one and it made
>no difference any further thoughts ?

cold start system malfunctioning, possibly - could be a sensor or could be
the wiring, bearing in mind the intermittent nature of the fault.

--
Austin Shackles. www.ddol-las.fsnet.co.uk my opinions are just that
If all be true that I do think, There are five reasons we should drink;
Good wine, a friend, or being dry, Or lest we should be by and by;
Or any other reason why. - Henry Aldrich (1647 - 1710)