1G huge power loss inconsistant may involve ac [Merged 6-7]

[LeeRichmond]

Okay well Ive got a 1992 talon tsi awd 5 spd

new wires
new plugs
timing is 5 deg btdc
all timing marks line up
caps replaced
tps checked
2.5 turbo back exhaust
new fuel filter


problem

I get what feels like timing pull (loss of about 40 hp) sometimes and I can get it to go away if I put on the ac and then shut the ac off. I run 94 octane and I have 150 across the board. I reset my computer and it didnt fix it. Any ideas or experience with this problem? thanks guys

 

[knochgoon24]

See, the nice thing about the A/C is that it has an off button. You can turn it on when you're stuck sitting in traffic and you can turn it off when you want to have the performance.

And the squeaking from turning your A/C onto the second knob might actually be your HVAC fan inside your car. Does it squeak without the A/C on? It took me 20 min to replace mine since it was making odd noises. I just pulled one from a junkyard.

 

[Scuba_Steve]

How much performance on average do you lose having the ac hooked up, but turned off?

 

[Defiant]

The AC shouldn't add enough drag to be noticed that much. The days of the old 10HP York piston compressors are long-gone, and modern AC compressors pull about seven.

Sounds more like you need plugs and wires, or that your engine is simply used-up.