When my fiero is running with no AC it runs fine, once AC is on the car becomes jerky. I have a stock 2.8 It has a new distributor, cap and point as well as new spark plugs, wires and injectors. TIA

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[This message has been edited by tshark (edited 09-08-2018).]

quote Originally posted by ninjayogi: ...once AC is on the car becomes jerky.

That's a pretty crummy description.

Does the idle speed go up and down while the car is sitting still with the A/C on? If so, is that in tandem with the A/C cycling on and off rather quickly? The A/C might just be low on refrigerant.

DA6 or V5 compressor Da6/HR6 based a/c systems used a cycling system that causes the a/c to switch on and off as the pressure rises and falls, V5 based systems do not and much smoother in operation. Is there a switch on the accumulator up front? If so it is DA6/HR6 cycling system, if not then v5. With a cycling system you often (especially on a Fiero) feel the additional drag as the compressor engages. Is it 'jerky'? I don't think so but it depends on how you define jerky really. If it's just a feeling of additional resistance then that is normal.

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Anything I might say is probably worth what you paid for it, so treat it accordingly!

Dave

www.ltlfrari.com

It appears that the Freon level was low, I added more and it got much better. I would have never thought that it being low could cause negative performance issues. Thanks for all your help.

quote Originally posted by ninjayogi: It appears that the Freon level was low, I added more and it got much better. I would have never thought that it being low could cause negative performance issues.

Do I get a ribbon or a medal of some sort?

quote Originally posted by Patrick: The A/C might just be low on refrigerant.