Hi All,
I am hoping for some advice & guidance to solve an issue with Rupert!
Rupert is a Robin Hood 2B - 2.0 litre Ford SOHC (Pinto) fed by a Weber 38DGAS carburettor, the points have been replaced by an electronic switch (before I bought him). I use E5 petrol.
The symptoms an intermittent back fire and pops/ crackles on the over run - not all the time, not during the first 20-30 miles of a run, occasionally hesitant when asked for acceleration, occasionally when cruising along in traffic hesitant/ jerkiness/ lack of power when asked & then off we go! Occasionally a back fire on accelerating from cruising along. Rev counter drops to zero and then springs back in to life.
Stop at the road side and he will tick over fine, revs great, fuel in the filter housing. Set off no issues and maybe OK or maybe hesitant!! Cannot make it happen on demand!!
February 2024 back on road after 3 months, occasional start/ trickle charger on, serviced in prep for new season.
Noticed some pops & crackles on the overrun same as last summer, got a bit worse, on the run down to Malvern occasional back fire and intermittent loss of power/ jerkiness! Seems to be getting steadily worse.
I hope that makes sense!
Things I have done to rectify it…
Tried 2 sets of plugs (good spark on all plugs)
New HT leads
New coil
New rotor arm
New fuel filter
Repair to a chaffed wire to the coil
Sprayed brake cleaner (advised) around inlet manifold seemed to be no change in engine speed
Valve clearances checked and adjusted as necessary
Crank case breather split & venting to air - replaced with a catch (can crank case to catch can to inlet manifold)
Timing checked (6 BTDC) set in 2021 (marked on pulley & engine to easily check)
Mechanic (paid!)
Reset mixture & timing
Stripped carburettor, cleaned and put back together
Checked the things I did!
Told me he was still running slightly rich but couldn't turn screws in any more or fuel would be cut off.
Would investing in a rolling road set up session be a good idea? There is one not far from me advertising in CKC magazine?
Upshot he is running better than he was but about 20-30 miles into a run he will start with intermittent loss of power, hesitant on acceleration and a very occasional backfire, the nightmare is it is intermittent when it happens and I pull over to check things he ticks over (about 1000 rpm) fine and revs great.
In August 2023 his exhaust rattled itself to bits so had a new stainless steel one fitted - adapted escort manifold to 2.25" pipe and into a box.
Please could you have a think and let me know your thoughts. I must admit I am at a loss as what to do now!
HELP!!!