My 2+2 would not run at idle. It started fine from cold but when the
engine temp reached the point at which the automatic choke dropped the
revs to idle, it just cut out. It would start again immediately and by
keeping my right foot down I managed to get it to the garage where it
was due a service and MOT. They traced the fault to a split in a pipe
that was letting air in (or out?). Maybe it was also a fuel pipe, but
from the conversation I think it might have been an air pipe that had a
split.
So check all pipes!
Cheers
Mike M
On 14/05/2019 19:16, chris.quant via Quantum Owners Group wrote:
I had the same problem once. A new set of fuel hoses fixed it. The old
ones had corroded on the outside and were letting air in.
Chris G
*From:* Dave English <mailto:dandh.engl...@gmail.com>
*Sent:* Tuesday, May 14, 2019 6:44 PM
*To:* Quantum Owners Group <mailto:quantumowners@googlegroups.com>
*Subject:* [Quantum Owners] 2+2 - XR2 CVH engine, no idle
Thought I'd post this for future reference in case anyone else has the
same problem. A bit of fault diagnoses is always useful.
Driving to a model aircraft show at the weekend, my 2+2 started
cutting out every time the engine came back to idle. A bit difficult
to drive like that but I got to show, managed to avoid buying any more
toys, and got home again. I did notice it idled when the choke was on
until I touched the throttle.
Started playing with it today. First confirmed the fault. No idle
unless choke was on and lumpy below 1500 revs.
The anti run-on valve was clicking, so that was okay and, over
1500-2000 revs, everything was fine so timing and ignition should be
okay (although a weak spark may give similar problems).
For those that don't know, the anti run-on valve (sometimes called the
anti-dieseling valve) shuts off the idle fuel when you turn off the
ignition, to stop the engine running-on or dieseling.
To my mind that really just leaves a lack of fuel in the idle line,
possibly a blockage. (the Weber carb makes this idle fuel thing a bit
complicated, give me a SU carb anyday)
By now the I had the auto choke cover off and could set the choke at
any engine temperature, which allowed me to start the engine and get
to the carb without it stopping.
So, got the engine started, climbed out, got to the other end of the
throttle cable and used that to knock the choke off and keep the
engine running. With the other hand I started spraying WD40 into the
carb and then let the throttle drop to idle, and idle it did, running
nicely on WD40.
Hopefully this has confirmed a fuel blockage at idle, and after using
an Air Duster and some Carb Cleaner to no avail, the carb is now
sitting on my bench awaiting a service kit so I can strip and clean it.
Of course, it could be something completely different, so if anyone
has any other ideas, please let me know.
When it's fixed, I'll let you know what the real problem was!
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