MTFCA Forum

Last week I took my T around the block and hit a huge bump. It was big enough that we caught some air and I was cringing the entire time lol. I got out and made sure everything was ok and continued with my ride, after I was done I parked it for a week and now it's running very rough and exhaust is a little smoky. It ran fine when I parked it any ideas?

That's rather odd. First, I'd make sure the oil pan is not damaged and leaking off the oil. I'd also make sure the radiator is not leaking. Look at the entire exhaust system for any evidence of damage. Inspect the fuel tank and the entire fuel line for any possible damage. Be sure that the battery and connections related to it are still in place and in order. Check the engine mounts and suspension, steering, and frame cross members for any evidence of damage or looseness. Check all wiring, paying particular attention to the wiring between the coils and the timer. It's also possible that hitting the bump disturbed sediment in the fuel system, some of which may have settled in the screen or the carburetor.

Have you tried adjusting the fuel mixture? It's possible, the bump might have altered it making it run rich. Secondly, perhaps something inside the carburetor has changed, such as the float level. A compression check would be in order to see if the valves are still functioning correctly. Another thing to check would be the orientation of the intake manifold. it's possible it is sucking in air around one end, causing that side to run lean and the other side rich.
Norm

Float level is my first though. Maybe the impact jarred the needle valve, sticking it open, or perhaps bent the float arm.

Nothing in the carb got bent or damaged, and in my opinion, Pat's suggestion of sediment being disturbed is one of the few guesses I've read which has much merit.

Scott_Conger wrote: ↑

Wed Aug 18, 2021 12:04 pm

Nothing in the carb got bent or damaged, and in my opinion, Pat's suggestion of sediment being disturbed is one of the few guesses I've read which has much merit.

If thats the case, drain the carb & sediment bowl into a clear glass container. Look at the drainings for debris.

Have a look in your coilbox. Make sure all 4 coils are pushed down to the bottom. One or two might have been pushed up a bit by the jolt. The resultant misfire could be causing your smoky exhaust issue.

I once drove across a railroad crossing that had the middle filler piece missing, between the rails. I got airborne! As I landed, the hood flew off the car. My cousin, seated next to me, would have been ejected had the top not been up. I collected my hood, restarted the car and drove away. No further problems. Lucky!