80 series petrol gutless?

[CruiserDan80]

Hi everybody, I have an 80 series petrol 4.5l 1995, auto. Recently I towed a caravan around australia with no problems at all until I can home. Since being home the cruiser is very gutless. At first I replaced the fuel filter, plugs, and tested leads. The engine didn't misfire as such just very gutless. I then removed the fuel pump in the main tank and check it for dirt. It was spotless. Even so I replaced the pump and filter on the bottom. No better. I then had the main muffler changed incase it was blocking up. No different. I drive it for about a month using an injector cleaner in the fuel. It started to start up very rough then clear itself. I bought some reconditioned injectors from eBay and put them in. Since then it has a rough idle, and sometimes a misfire. I replaced the leads, cap and fuel filter again for good measure. No change. When it has been running for a while and I switch it off it starts with a definate misfire. I have removed each injector plug to see which one it is but they all make a difference. Today I compression tested it and found 220psi in all but one cylinder. No. 5 had 190psi. I didn't think that was enough to create a misfire and lack of power. Anyone with sensible suggestions would be greatly appreciated.

[trentmeyer23]

Have you checked the air filter?

[CruiserDan80]

Yes mate the air filter is also new. Sorry forgot to mention that.

[kathinij]

Are you loosing any water in radiator?

[Not for highway use]

Your brakes may be dragging.

[gazza750]

timing belt slipped a gear?

[Leo80]

Dan did you solve this issue? My 94 80 is exhibiting exactly the same behaviour after recent heavy sand driving