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Well running the ac will rob some power from the engine because it takes engine power to run the ac compressor. I would maybe start with checking for vaccum leaks which could be leaning out the fuel mixture causing a loss of power. Just my 2 cents though, i’m by no means a mechanic
Hi Ojalem,
Great post with info and symptoms. I would start with the compressor, belt(s), and cooling fan(s). It would appear the compressor is working extra hard, and impacting negatively the performance of the car. This is definitely not normal. With regards to the “hissing” noise, check near the pressure relief valve on the compressor. This is a fail-safe, incase the pressure on the high-side gets to be too high (~450psi). If the relieft valve did open, there should be some PAG oil remnants .
If you have access to a set of AC pressure gauges, that would also help determine how the AC is working. If you are not familiar with this, then it would be best to have someone who is trained perform.
Good luck. Keep us posted.
Yup, I’ll also agree with the vacuum leak….that would be the best place to start. I was jumping ahead with the compressor, fan, and belts. The “hissing” noise would more than likely by a vacuum leak. The compressor, when “on” is adding load to the engine, making the engine work harder, especially if there is a vacuum leak. Keep us posted.
(Thanks rice400, wardak33, and scottie35….I missed the obvious here.)
I think it might be a giant snake under your hood biting holes in your intake hoses…lol j/k…..I agree check all vacuum hoses and intake itself..start car up and look under hood to try see where hissin comes from.If you think it maybe something to do with A/C compressor or anyhting A/C related take it to a pro unless u have the knowledge and tools to do it..Very dangerous dealing with A/C since it’s PRESSURIZED to extremes…Good luck and post back your findings…
I’m going against the group on this one, if your cat was coming apart then it may very well have gone the rest of the way, if the exhaust is restricted you will get the exact symptoms you describe. You might want to drop the exhaust at the manifold or before the cat, you could even remove the O2 and take it for a drive, if the symptoms go away fix the restriction and go from there. I don’t recommend driving a car with an exhaust restriction for very long as you may damage the engine.
I will also agree with vacum leak. Check that first then i would look at ignition wires. Sometimes an arcing can sound like a hiss especially at high rpm.
Thanks everyone for the replies, calmed me down quite a lot just to have a general idea of what to look into. I did a vacuum leak test and found nothing major (just a loose hose, since been replaced.)
As for Eric’s answer, my father actually thought the same thing prior so I was planning on getting under there and tearing my exhaust apart to see the damage firsthand. I’m in the process of acquiring a new cat, though the rattling is going on pretty deep into the system (I’m pretty sure there’s some debris sitting in the resonator) so I might as well rip out the entire exhaust and clear that up.
Another question, are there any components that I may need to inspect for damage or readjust this early into the problem?
Again, thanks a lot everyone, really helps to have even the slightest idea of what’s going on.
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