P
Paul S. Brown
Guest
Badger wrote:
>
> "Paul S. Brown" <[email protected]> wrote in message
> news:[email protected]...
>> A friend of my wifes has asked me to take a look at their 1986 RRC which
> has
>> a problem which is that intermittantly it loses power and dumps large
>> amounts of black smoke out the back end of the car and occasionally
>> stalls at idle.
>>
>> They had the coil changed and this helped for 2 days before the problem
> came
>> back again. The plugs have all been changed and one garage it was into
>> removed the cold start injector which seemed to help a little.
>>
>> I've never played with an EFI and so don't know the "normal" problems
>> they suffer from.
>>
>> Given that this problem sounds like massive overfuelling
>
> More than likely, from the sounds of it. Possibly the ecu temp sender
> throwing a wobbly or a bad connection to it?
>
>> or a major ignition
>> problem I'm leaning towards something being up with the distributor -
>> either the advance/retard doing stupid things and throwing the timing
> badly
>> off or the spark being particularly poor.
>
> Could also be the ignition module on the side of the dizzy, they can do
> weird things when they get old as they lead a hard life in that hot,
> vibrating home of theirs!
>
OK - just got it home. On starting it up it was running with what felt like
a 3-5 cylinder misfire which cleared once the engine got hot, although it
was still blasting black smoke while running and was hunting quite a lot
when idle.
As a quick test I had my wife rev it up and down the range while I pulled
the vacuum tube off the top of the plenum (the advance/retard pipe) and
there was a grand total of zippo difference to the running of the engine at
any rev range.
It's also got an interesting mechanical clatter from the backend which I
thought was exhaust popping until I heard it mixed with a tinny rattling
noise.
I see this taking much work.
P.
>
> "Paul S. Brown" <[email protected]> wrote in message
> news:[email protected]...
>> A friend of my wifes has asked me to take a look at their 1986 RRC which
> has
>> a problem which is that intermittantly it loses power and dumps large
>> amounts of black smoke out the back end of the car and occasionally
>> stalls at idle.
>>
>> They had the coil changed and this helped for 2 days before the problem
> came
>> back again. The plugs have all been changed and one garage it was into
>> removed the cold start injector which seemed to help a little.
>>
>> I've never played with an EFI and so don't know the "normal" problems
>> they suffer from.
>>
>> Given that this problem sounds like massive overfuelling
>
> More than likely, from the sounds of it. Possibly the ecu temp sender
> throwing a wobbly or a bad connection to it?
>
>> or a major ignition
>> problem I'm leaning towards something being up with the distributor -
>> either the advance/retard doing stupid things and throwing the timing
> badly
>> off or the spark being particularly poor.
>
> Could also be the ignition module on the side of the dizzy, they can do
> weird things when they get old as they lead a hard life in that hot,
> vibrating home of theirs!
>
OK - just got it home. On starting it up it was running with what felt like
a 3-5 cylinder misfire which cleared once the engine got hot, although it
was still blasting black smoke while running and was hunting quite a lot
when idle.
As a quick test I had my wife rev it up and down the range while I pulled
the vacuum tube off the top of the plenum (the advance/retard pipe) and
there was a grand total of zippo difference to the running of the engine at
any rev range.
It's also got an interesting mechanical clatter from the backend which I
thought was exhaust popping until I heard it mixed with a tinny rattling
noise.
I see this taking much work.
P.
