Hey all - I'm about a month into a new to me 1973 with the original F 155 and 3 speed transmission. It seems to run great under 40mph and also runs well on flat ground up to about 55. However, if I'm going uphill - even very slight hills - and need to add throttle it starts and then sputters and backfires. I get back down to 40 and I'm good. If I hit a steep hill around 40 I can shift down to 2nd and just hold speed or climb around 35mph.
I'm going to take it to the local cruiser specialist in 3 weeks for a more thorough review of the rig, but I'd like to do a bit of diagnosis so I'm a bit more informed and can hopefully fix these issues myself soon. Specifically, I'd like to run through a diagnosis and see if I can identify the issue. I'm interested in the order of actions I should take. I have the following in mind - but I don't really know what I'm talking about and would appreciate your thoughts on an ordered next steps to hopefully find the root cause.
I've pasted a list of the work done by the PO over the past few months reviving the engine.
THANKS!
I'm going to take it to the local cruiser specialist in 3 weeks for a more thorough review of the rig, but I'd like to do a bit of diagnosis so I'm a bit more informed and can hopefully fix these issues myself soon. Specifically, I'd like to run through a diagnosis and see if I can identify the issue. I'm interested in the order of actions I should take. I have the following in mind - but I don't really know what I'm talking about and would appreciate your thoughts on an ordered next steps to hopefully find the root cause.
- verify timing - maybe it's a tad ahead and hopefully relatively easy to check and confirm
- identify vacuum leaks - the threads with backfiring at throttle seem to point in this direction
- compression test - get a current baseline and take action if necessary
I've pasted a list of the work done by the PO over the past few months reviving the engine.
THANKS!