An odd problem to describe really, i originaly described it as losing power in 4th and 5th gear and had a reasonable solution posted back but the problem seems to be getting worse. the best way i can think of describing the problem is explaining the noise. instead of going vrmmmmmmmmmmm continuously, it goes vm vm vm vm vm vm vm vm and up hill i can feel it **** as it is pulling up the hill it dosent splutter but it sounds more like vibrato if it was holding a note whilst singing
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sounds like misfire.
the CEL glow at this misfiring< yes, then pull the DTC errors.
know how yet?
#1 reason for misfire is, SKIPPING the 60k mile tune up. #1
#2 above done. is low fuel pressure.
there are many more, but we do tests to find them. ask
I understand what you are describing, but keep in mind it is almost impossible to have an actual vapor lock on a fuel injected vehicle. Vapor lock is when the gasoline in the fuel line turns to vapor before it gets to the engine. I am assuming your Ford is newer than 1982 and has fuel injectors. In your case it could be a vac leak or something making the fuel mixture too lean. A problem with the EGR valve or other component could cause the issue. Is the check engine light on ?
Those are the normal symptoms of a worn clutch. It will pull quite well in lower gears but slips in the higher gears. I doubt if releasing the clutch adjustment is going to give you a bit of grace, you will soon have to replace the clutch, especially considering the noise.
When in the upper gears, reduced power output from the engine becomes more noticeable in 5th and 6th gear due to the more direct drive created by the higher ratios. First thing I would do is put some additive in the fuel to clean the fuel system and decarbon the head and combustion chambers. I use a Nulon product, not sure what you can get in your part of the world. Techron is another good well known product that works. In fact, if you bike is affected by buildups any brand name cleaner additive will help with the problem.
Also check that the drive chain is well lubed, a dry chain can rob up to 2 kw of power. Check wheel hubs for excessive heat/bearing problems. Happy to talk to you more about it. Cheers
Only three things would cause the problem. 1) a slightly beny shift fork, 2) a shift index wheel loose, 3) the foot shift lever needs to be adjusted.
The most likely source is the shift lever needing to be lower. Once you are in 5th gear you move your foot to the top iof the pedal in preparation for a downshift. At high speed your entire body is leaning forward FOOT INCLUDED. Chances are that enough pressure is on the pedal to move the slider gear out of position and thus out of 5th gear.