[Roadsters] SU air filter to carb gaskets /very rough idle

[D Riedel]

Thanks for the advice guys.  There's lots of good stuff there to try.

The fuel is either Co-op premium (a local operator), or Shell premium.  For
the latter, I'm not sure where the fuel is actually sourced, but it is 91
octane and contains 0% ethanol.  The Shell apparently contains a lot of
cleaners (which they are very excited to tell you about),and it too is 91
octane, with no ethanol.  However, the fuel has sat in the car since late
October.  I've had trouble post-winter start-up with gunk-filled fuel
filters in the past, but not with this rough running issue.

There is oil in the dashpots, although it may be a bit low (I know it's
covering the piston, but possibly only just)

I will double-check the dashpot oil level, plug wires and spark along with
doing carb cleaner vacuum leak tests.

I'll also give it a chance to run and little and check for uneven carbs,
stuck floats, etc.

Meanwhile, Ross at Sports Imports is tracking down the gaskets for me.

Cheers,
Dave









On Thu, Jun 29, 2017 at 3:46 AM, RWM <rwm at rwmann.com> wrote:

> John and Dave,
>
> I use 'Stabil' fuel conditioner when over-wintering the car and have never
> had a fuel-related issue.
>
> Did have a sticking carb one spring, but that turned out to be a sunk
> float. R&R and good to go again.
>
> - Bob Mann, '68 2000 Solex
>
>
>
> On 6/29/2017 5:08 AM, J Sandhoff via Datsun-roadsters wrote:
>
>> I second Paul's observation. Does Canada use oxygenates in the fuel
>> like the States (i.e. ethanol; refined corn down here). If so I
>> suspect your gas has gone sour.
>>
>> I rebuilt my SU's last fall, then the car overwintered. I'm getting to
>> rebuild them again now 'cause they're totally gummed up with a putrid
>> green sticky mess. California gas is the worst.....
>>
>> -- John
>>      John F Sandhoff   jsandhoff at gmail.com   Sacramento, CA
>>
>>
>> On Wed, Jun 28, 2017 at 2:40 PM, D Riedel via Datsun-roadsters
>> <datsun-roadsters at autox.team.net> wrote:
>>
>>> I started my 2000 SU the other day after it's winter break and it ran so
>>> rough I thought it might bounce off the mounts.  As I peered around the
>>> carb
>>> area hoping to spot something odd (maybe a leaky hose causing a vacuum
>>> leak?), I noticed that I don't have gaskets between the air filter
>>> housing
>>> and the carbs.  Yikes.  First of all, I really wonder how this has been
>>> affecting things all along, but second I'm wondering how I might start
>>> correcting the rough idle.  Since the car has never had these gaskets
>>> since
>>> I've owned it, whatever is currently happening isn't exactly related
>>> (that
>>> is, it ran fairly smoothly last year).
>>>
>>> Any thoughts on 1) the missing gaskets, and 2) a process of elimination
>>> to
>>> smooth out the idle.
>>>
>>> Thanks everyone,
>>>
>>> --
>>> Dave Riedel
>>> '69 2000
>>> Victoria, BC
>>>
>>
>


-- 
Dave Riedel
'69 2000
Victoria, BC
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