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Curtis B.
Curtis B., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 28910
Experience:  Technician turned service manager on multiple lines of trucks and engines, used in industry.
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My ford 4000 gas tractor has begun to fire intermittently and

Customer Question

my ford 4000 gas tractor has begun to fire intermittently and backfire loudly
JA: We'll do all we can to help. Tell me a bit more about what's going on so the Heavy Equipment Mechanic can help you best.
Customer: it runs but will not time out smoothly
JA: Is there anything else important you think the Heavy Equipment Mechanic should know?
Customer: governer seems to be working and carb too
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Heavy Equipment Mechanic about your situation and then connect you two.
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Curtis B. replied 1 year ago.
Can you loosen the spark plug wires and with engine idling, remove one wire at a time to see if it is a single cylinder? You may have a stuck valve on the backfiring cylinder.
Expert:  Curtis B. replied 1 year ago.
If it is erratic, the coil may be failing.
Expert:  Curtis B. replied 1 year ago.
did you find the problem?