Car doesnt accelerate as fast anymore

B&W_Evader

Looks like fuel and air issues to me. I have a cheapo 15$ reader and I can watch the voltages on all the sensors. Had it for a while now and works pretty good. Plug it in and rev the engine a couple of times. You should see stuff voltages changing. The internet can explain each item if you search on it.
Software icon says "OBDwiz". Just plug the adapter from the car's OBDII port to my laptop USB. Helped me isolate my check engine on my Tacoma to the O2 sensor. Fixed on first part replaced.
Checked a code on my Z the other day. Cyl 4 misfire. Reset and it's been good. Think that one was a bad tank of gas.

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|RIP|6spd-sport|OSG-LSD|XP8|RBF600|Eibach Sways|RE-71R|FI-34Row|Gen3-CAI|Yaw P.S.|

Jhill

Honestly these are very reliable cars and fuel trim codes shouldnt be hard for a competent tech to diagnose. If you don’t have vehicle knowledge then it is time to stay clear of the autozones, free scan diag shops etc. all they will be doing is getting the code and throwing parts at it, which you have already done yourself. Time to take it to a real shop, maybe one that is gold shield certified for emissions repairs (not sure if that applies in your area) as these are the shops that have to actually fix cars once all the parts changers are done and throw their hands up.

Good luck, as I said it shouldn’t be hard for a competent tech to diagnose fuel trim issues but sadly those are getting harder and harder to find as the industry keeps pushing them out. Once you find one keep him, possibly even his personal number if he isnt the shop owner, in case he quits. All the shops and dealers seem to forget it’s the techs that make the shop/dealer not the other way around and they only recognize it after people start quitting and their reviews tank.

B&W_Evader

My guess would be intermittent vacuum leak. You've got codes upstream and downstream of the engine all related to fuel/air mixture. Check for a loose or cut hose around the intakes. I think it's unlikely the gaskets are leaking unless you've had the manifolds off or have overheated the engine. If you run rich you can burn out the cats. Then you'll really loose power as the air won't flow through them any more. If all else fails, may want to consider a compression check on each cylinder to make sure it's not something really bad.

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|RIP|6spd-sport|OSG-LSD|XP8|RBF600|Eibach Sways|RE-71R|FI-34Row|Gen3-CAI|Yaw P.S.|