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Hi Im David, thanks for visiting the site. Has any one done a back pressure test?
for the engine to lose that much power just because of the the ac being on is the sign of a tired engine. do you ever get a flashing checking engine light? If you are not sure a back pressure test was done, you need to find out, even a partially clogged cat will run decent under no load but when you load up, its going to struggle.
theres really no other explaination, especially if thee compression on ALL cylinders are at least 150 or above and theres not a difference of more than 15% from the highest reading and the lowest
has anyone removed the serpentine belt and spun all of the pulleys by hand to see if any are binding up?
no flashing check engine light under load?
Im clueless. I shall bow out and allow someone else to chime in. good luck.
When was the last time the spark plugs or fuel filter were replaced?
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Thanks for using Just Answer, Eric
It is possible that the internals of the ac compressor are getting hard to turn, and the hotter it is the harder time it has. has a new compressor been installed yet?
Has anything been tried or replaced to fix this? Besides the computer and backpressure test?
Ok. I will opt out since it sounds like this is going to need a hands on approach to try and figure this one out. Thanks.
I never see where you mention what engine this is.
Anyhow, I was starting to agree somewhat with Eric about the ac compressor but I would go one step further if at all possible and I was thinking of getting in on an engine dyno and measure the engine horsepower with the ac off and on and see how much horsepower that ac compressor is actually using and try somehow to either find a spec or compare to a similar vehicle.
I don't know but I suppose they could always remove the front driveshaft. I am not that up on awd just yet but I was trying to find a horsepower spec anyhow for that compressor and this is about the best I could do, but no horsepower spec. I did read it should be the ford fs-10
There have got to be dynos for awd.
I have never used one though.
Well, if you are going to install a new engine and place that ac compressor on it, you may still have the same problem so if I was you I would go ahead and replace that ac compressor again now and see if the problem goes away.
You are welcome.
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