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Hello, all. I need some advise regarding some issue i have with my workshop. 

This are the few service i ask them to do, i spend thousands dollar to get it done, but its wasn't done and instead revert back. 

- change air intake pipe $300

- decat $400

- tuning $1070

After changing air intake pipe, 1st engine light come out, rpm drop up and down and my car stall (auto) , he told me need clean throttle body. 2nd time same issue he told me need tuning. (after decat and tuning) 3rd time, same issue he told me is my oxygen sensor got problem. In the first place i thinking he should have check it instead of dragging it. 

During the 3rd time, he ask me to go down his workshop to fix the engine light problem. I went to get it fix, instead it never worked. After awhile he say he go ask the tuning workshop then get back to me. Few days later he say will put back my cat. And he say he will retune my car also. Do you guys think this is appropriate? Can i ask for refund? Because I am thinking that i actually paying something but not getting it done. 

 

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Once you decat of course engine check light will lit.

not forgetting the car being in limp mode.

 

 

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I remember previously when I replaced my header, straight through cat, modified to quad exhaust and tuning, the check-light also appear.

The tuning workshop told me is normal.  To solve this issue, they installed an adapter sending signal to the newly tuned ECU for the new perimeter (there is a term for it, I forgotten).

There after, all problem solved. 

Like what bro Turboflat4 ask, is better if you indicate "What car? Which shop? What parts and what type tuning they do"?

 

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What a noob workshop.

If the bore size of the air intake manifold is increased compared to stock pipe size it will caused the idling rpm to be irratic...like what TS mentioned. It will be easier to rectify by using the same pipe size as stock.

Increasing more air flow or increasing pipe size be it air intake or exhaust side you have to tune for more fuel to acheive the 12-13:1 air/fuel ratio. If need to you will have to use bigger cc fuel injectors, bigger fuel pump and fuel rails depending on what you are modding. Increasing more air alone will only run the engine too lean. It will cause a lot more problem by overheating the engine.

Edited by Watwheels
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If you are still driving the Impreza 1.5, get it reverted and re-tuned back to stock. Get back the $1070 (I wonder what the tuner can tune anyway) and don't think of modifying it anymore. 

Last but not least, let us know which workshop and tuner. 

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I'm driving subaru impreza 1.5r, my first car. I went to Dynamics Mechanic at woodlands, which tuner I'm not sure already its at sin ming there thats all i know. I paid him to do decat and custom tuning i never really go ask, because I'm not really sure also. I only trust him because he is first workshop i went to. 

Edited by OneyeKing

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1 hour ago, OneyeKing said:

I'm driving subaru impreza 1.5r, my first car. I went to Dynamics Mechanic at woodlands, which tuner I'm not sure already its at sin ming there thats all i know. I paid him to do decat and custom tuning i never really go ask, because I'm not really sure also. I only trust him because he is first workshop i went to. 

What were your expectations when the WS suggested a change of 1) air intake piping, 2) decat and 3) ECU tuning? Better performance (torque & horses), fuel consumption and perhaps a smoother ride? With that amount spent, did the WS guarantee objective improvements, perhaps via dyno charts? Did they also mention to you the risks and hazards involved? How did the tuner tune the stock ECU? These are the questions you need to ask prior to handing the car over in the first place. 

I will not go into details on how 1) & 2) can give you CEL but the WS should know better. For tuning, ask them in detail, how they access the ECU and what kind of "custom tuning" they performed. If they cannot give a straight answer, request for a refund. 

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2 hours ago, Naimed said:

What were your expectations when the WS suggested a change of 1) air intake piping, 2) decat and 3) ECU tuning? Better performance (torque & horses), fuel consumption and perhaps a smoother ride? With that amount spent, did the WS guarantee objective improvements, perhaps via dyno charts? Did they also mention to you the risks and hazards involved? How did the tuner tune the stock ECU? These are the questions you need to ask prior to handing the car over in the first place. 

I will not go into details on how 1) & 2) can give you CEL but the WS should know better. For tuning, ask them in detail, how they access the ECU and what kind of "custom tuning" they performed. If they cannot give a straight answer, request for a refund. 

WS tell me i will expecting alittle more performance and abit more fuel consumption. But end state i get better fuel consumption than before. Yes there was an improve of 10hp (i have the dyno chart pic) and better fuel consumption. But the checklight was there, after i let them try to install something to my car to remove the checklight issue, my car feel heavy and fuel consumption was bad. His own mechanic tell me my car need retune, but the workshop owner insist try one week first. I'm actually fine with checklight being there. But my workshop say they will remove it because by right not supposed to have after tuning. They never explain to me any risk or hazard. Only about inspection thats all. Regarding what custom tuning they did to my car, will go ask them when i go down they're workshop. 

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