I have a Tennant ride on floor sweeper with a 1.6 GM engine. it wont run more than a few seconds, then backfires. Sounded a a worn camshaft or jumped timing belt. did a compression test with all plugs out and open throttle valve...all 180 except for one at 165. I eliminated all external causes by swapping known good parts from another sweeper. The coil, wires, mixture control and the fuel cut-off, all control valves, crank shaft position senser and even the ECM. Ive removed the cover to check timing belt and verified its all good. Even removed the timing gear and balancer to check if they spun..all good. All valves open and close with good travel...lobes all perfect.
looking for a manual..maybe monday.
anyone have any other ideas.....
Showing items 16 - 18 of 18 results.
have you checked the exhaust and manifold for leakage anywhere? look for any holes in the piping, if it pulls in cold air back into the engine it will make it backfire.
Also check the intake as well, check around the carb/mixer for any open ports, check lines for cracks etc.
you can usually use penetrating oil and spray it in places you suspect and if it changes the way the engine runs you found your leak.
This is just a suggestion since you seem to have eliminated everything else. It just sounds to me like you have an air leak somewhere.
you didnt mention changing the lp vaporizer have you changed it?
Maybe able to get a manual off of tennants website,google it should be able to find it,know they offer alot of their manuals online.
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