Subject: Run on/ backfire
> After a drive, upon turning car off, the car runs on, and backfires.
> Crane electronic ignition,mild street cam.No carb leeks. My mechanic
> says plugs are not fouled. Exhaust rich with moist carbon. If timing set
> any lower car stalls. Any suggestions. Mechanic is stumped and I am
> annoyed! Any suggestions? Thanks
> Phil smith
> TR6
Phil,
You didn't mention the year. The '73 and later engines have antirunon
valves that cause a depression in the float chamber after the ignition is
turned off, effectively cutting off the fuel and eliminating (sometimes) the
run-on. This hardware may not be working -- if it's a '73 or later.
The vacuum retard unit retards the timing about 10 degrees at idle. This
necessities more fuel to keep it running at idle. You might try
disconnecting the vacuum retard (disconnect the little hose) and then
readjust (lower) the idle speed.
Have you raised the compression --- if so, try a higher octane fuel. You
might try it even if you haven't raised the compression.
Have you checked the engine temperature, is it running very hot?
Nelson Riedel
Granville, OH
76 TR6 (just painted, now repairing damage from fender bender)
68 TR250 (next project - new paint)
70 TR6 (all the parts in a pile ready to assemble)
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