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 Sent: Tuesday, May 14, 2019 6:44 PM To: Quantum Owners Group 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! -- -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to quantumowners@googlegroups.com To unsubscribe from this group, send email to quantumowners-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s). --- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to quantumowners+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/quantumowners/1c739726-3b04-418a-b9d0-8c50b66f5938%40googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to quantumowners@googlegroups.com To unsubscribe from this group, send email to quantumowners-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s). --- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to quantumowners+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/quantumowners/D3C1C4F3632A49AF817B60C5DE7E7131%40HomeNew. For more options, visit https://groups.google.com/d/optout.
