Car goes on rough idle

Discussion in 'Forced Induction - 5.0L V8 Engine' started by jrsexpress, Mar 23, 2016.

  1. jrsexpress

    jrsexpress Well-Known Member

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    I installed a roush supercharger phase 1 on the car and also had Lund give me tune file for it had installed aside from the kit a VMP 2015-2016 Mustang GT 5.0L IAT Harness and Brass Air Temp Sensor for PD Blowers from lethal performance and also got the vmp but when I drive the car the engine goes rough so much that even if I press on the gas pedal there is no reaction at all on the engine I kill the engine and wait a while and when I start its gone can any one help me out
     
  2. Guard5.0

    Guard5.0 Well-Known Member

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    I'm trying to understand. You have a Roush phase 1 kit with a Lund tune but it doesn't run. You should have a voucher from Roush for their base. Load it to see if it clears up the problem. If not it's mechanical (wiring, etc.) since its a basic known tune. If the Roush tune cleans it up call Lund.
     
  3. OP
    OP
    jrsexpress

    jrsexpress Well-Known Member

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    Sorry it's runs good but once in a while it starts acting up and no trottle responds the car is in the Philippines and we installed the kit here and as we did the installation we got the tune from lands we are still in fact tuning it with lunes but when I am doing datalog it won't happen the trottle or idle problem as its erratic and does happen when I am driving the car lunes said they need that datalog to figure out the problem so I was just wondering if some one had this problem or came across this thanks
     
  4. Super Werty

    Super Werty Well-Known Member

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    vacuum leak?
     
  5. OP
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    jrsexpress

    jrsexpress Well-Known Member

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    But when it happens I kill the engine and wait a few mins then when I start its running fine
     
  6. Bahndvr

    Bahndvr Roushcharged

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    Did you resolve this?
     
  7. OP
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    jrsexpress

    jrsexpress Well-Known Member

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    Yup I did it was the throttle body that had a problem
     
  8. Bahndvr

    Bahndvr Roushcharged

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    How did you find the problem?
     
  9. OP
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    jrsexpress

    jrsexpress Well-Known Member

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    We changed the cheapest parts first like the bap then the delete plug and still did not fix the problem then I just took the chance as I read that the throttle body of dropped can cause the loss of the calibration so I just took the chance and got one from roush and it fixed it and till today have never had the fault or problem come back
     
  10. Bahndvr

    Bahndvr Roushcharged

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    I would have thought the datalogs would show where the problem might be?
     
  11. OP
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    jrsexpress

    jrsexpress Well-Known Member

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    That's what I thought even the diagnostic marchine but nothing would come out at all
     
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