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Engine is bucking under load

Unread postby Acesneights on Mon Aug 22, 2016 8:29 pm

Went away last weekend and was towing my ATVs and noticed from time to time the Travco would buck like a pop back or something. Not sure what's going on. I'm better with diesels than gassers. Not sure if it's getting vapor lock, the fuel filter is bad(not very old but I have noticed rust in them) or something wrong with the carb or maybe the Electronic ign box going bad ?
I hate intermittent problems.
1975 Travco 270
1974 Travco 220 Parts unit
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Re: Engine is bucking under load

Unread postby KB2CRK on Tue Aug 23, 2016 7:00 am

Intermittent is a bitch. Only difference between gasser an diesel is the ignition system. Hate to say it but an intermittent pop back could be any of the things you mentioned.
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Re: Engine is bucking under load

Unread postby Acesneights on Tue Aug 23, 2016 5:36 pm

yeah, It's never an easy thing for me...it's always "Wow, never seen that before"
1975 Travco 270
1974 Travco 220 Parts unit
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Re: Engine is bucking under load

Unread postby 77Travco on Wed Aug 24, 2016 7:08 am

If the engine starts to run out of gas, it will fade off, not cut out and in sharply. I would start with the cap and rotor and check all connections while you're in there.
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Re: Engine is bucking under load

Unread postby Acesneights on Mon Sep 05, 2016 6:54 pm

Well,
I changed the coil, cap, rotor, wires and plugs.
Fuel filters(3) and I put in a HP Mech Carter Fuel pump. Seems to be ok now. The only thing I saw that looked bad was a few of the spark plug wires were questionable. Funny, I had trouble with Accel years ago...You think I would have learned from that. I changed over to MSD 8mm wires.
The generator was running weird too...I am beginning to think I got a bad load of gas up in NH.
1975 Travco 270
1974 Travco 220 Parts unit
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Re: Engine is bucking under load

Unread postby Acesneights on Mon Oct 10, 2016 8:08 pm

Well, took her to Gilbert Pa a few weeks ago for a military truck show towing a 6x12 trailer then we hit the Diesel nationals in Englishtown on the way back and she ran great.
Just went up to NH this weekend and did about 450 miles towing a 16 ft equipment trailer with tools and 3 atvs and she ran great the whole way. I got about 7 mpg heading up and 6 coming home. Not horrible considering I was probably close to 19,000lbs with trailer in tow.
1975 Travco 270
1974 Travco 220 Parts unit
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Re: Engine is bucking under load

Unread postby 77Travco on Tue Oct 11, 2016 2:03 pm

Acesneights wrote:Well, took her to Gilbert Pa a few weeks ago for a military truck show towing a 6x12 trailer then we hit the Diesel nationals in Englishtown on the way back and she ran great.
Just went up to NH this weekend and did about 450 miles towing a 16 ft equipment trailer with tools and 3 atvs and she ran great the whole way. I got about 7 mpg heading up and 6 coming home. Not horrible considering I was probably close to 19,000lbs with trailer in tow.

Good to hear!
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