v6 and 7 eighths!

S

Si K

Guest

• Jan 1, 2006

• #1

Hi All,

Happy new year

Getting most hacked off with the disco now!

so far....

New camshaft, followers and pushrods (cos it seemed down on power, turns out
engine had not been particularly well looked after!)

New Dizzy cap

New leads

New rotor arm (twice!)

New coil

New plugs (twice)

New airflow meter

And still it seems like its running on 6 and 7 eighths cylinders rather than
a full 8. Plus, getting a slight niff of fuel when running, which suggests
that it is still overfuelling (which is why the airflow meter was replaced)

Any ideas?????

Only other things that come to mind now are the temp sensors (not the one
for the gauge - assuming this has two like the 3.9 rangie) and the ecu

Si

 

E

EMB

Guest

• Jan 1, 2006

• #2

Si K wrote:

> Any ideas?????

Fuel pressure regulator.

Check the charging voltage - ECUs often do bizzarre things if the
alternator output isn't correct.


--
EMB

 

B

Badger

Guest

• Jan 2, 2006

• #3

"EMB" <[email protected]> wrote in message
news:[email protected]...
> Si K wrote:
>
>> Any ideas?????
>

Injectors??
Put it on an old fashioned crypton analyser and do a "Power Balance" test,
that'll trace it to whatever cylinder(s) are the cause.
Badger.

 

S

Si K

Guest

• Jan 2, 2006

• #4

"Badger" <[email protected]> wrote in message
news:[email protected]...
>
> "EMB" <[email protected]> wrote in message
> news:[email protected]...
>> Si K wrote:
>>
>>> Any ideas?????
>>
>
> Injectors??
> Put it on an old fashioned crypton analyser and do a "Power Balance" test,
> that'll trace it to whatever cylinder(s) are the cause.
> Badger.
>

The one thing I forgot is that pre camshaft change it seemed ok, but its
only since the airflow meter went tonto overfuelling that all has been bad
in the garden of v8

Si

 

J

John Greystrong

Guest

• Jan 2, 2006

• #5

Si K wrote:
> Hi All,
>
> Happy new year
>
> Getting most hacked off with the disco now!
>
> so far....
>
> New camshaft, followers and pushrods (cos it seemed down on power, turns out
> engine had not been particularly well looked after!)
>
> New Dizzy cap
>
> New leads
>
> New rotor arm (twice!)
>
> New coil
>
> New plugs (twice)
>
> New airflow meter
>
> And still it seems like its running on 6 and 7 eighths cylinders rather than
> a full 8. Plus, getting a slight niff of fuel when running, which suggests
> that it is still overfuelling (which is why the airflow meter was replaced)
>
> Any ideas?????

I'd start with a compression check, wet and dry.

John

 

Guest

• Jan 2, 2006

• #6

"Si K" <[email protected]> wrote in message
news:[email protected]...
> Hi All,
>
> Happy new year
>
> Getting most hacked off with the disco now!
>
> so far....
>
> New camshaft, followers and pushrods (cos it seemed down on power, turns
> out engine had not been particularly well looked after!)
>
> New Dizzy cap
>
> New leads
>
> New rotor arm (twice!)
>
> New coil
>
> New plugs (twice)
>
> New airflow meter
>
> And still it seems like its running on 6 and 7 eighths cylinders rather
> than a full 8. Plus, getting a slight niff of fuel when running, which
> suggests that it is still overfuelling (which is why the airflow meter was
> replaced)
>
> Any ideas?????
>
> Only other things that come to mind now are the temp sensors (not the one
> for the gauge - assuming this has two like the 3.9 rangie) and the ecu
>
> Si
>

Somebody said to me the first thing to do when a V8 3.9 EFi is not running
well is to change the temp sensors for the ECU.
When my V8 was running rough (over fuelling) I changed the ECU temp sensor
for about 8 quid and now it runs perfectly.
I measured the resistance of the old one at various engine temperatures
before taking it out and it just gave random readings. It was not even close
to the published specs.

A

 

G

GrnOval

Guest

• Jan 3, 2006

• #7

I was kind of hoping this one would be suggested as that was my next
course of action.

Si