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Old 08-09-2014, 10:54 AM   #1
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03 roush idle problems

I just bought an 03 roush with 91k miles on it, very nice car. The only problem I've had so far is an idle issue. It usually idles around 800 rpm but lately it's been dropping enough to make it stall. It's also throwing 3 codes (p0420, p1150, and p0174) not sure if the codes are because of the exhaust (no cats or oxygen sensors)...help would be greatly appreciated..

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Old 08-09-2014, 03:50 PM   #2
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The P0420 is because of your exhaust system.
P1150 is related to the computer sensing that something is making the engine run too lean.
It could be a number of things causing this code. I'd start by inspecting and cleaning the Mass Airflow sensor and checking the air intake for any leaks and also all of the vacuum lines.
The next most common cause is a failed or disconnected Oxygen sensor.
There are more but start with the cheap and easy things first.
P0174 and P1150 are saying, basically, the same thing.
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Old 08-10-2014, 01:38 AM   #3
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Quote:
Originally Posted by straybullitt View Post
The P0420 is because of your exhaust system.
P1150 is related to the computer sensing that something is making the engine run too lean.
It could be a number of things causing this code. I'd start by inspecting and cleaning the Mass Airflow sensor and checking the air intake for any leaks and also all of the vacuum lines.
The next most common cause is a failed or disconnected Oxygen sensor.
There are more but start with the cheap and easy things first.
P0174 and P1150 are saying, basically, the same thing.
Thanks! I'll get started checkin those 1st thing in the morning. Just wanted to get a general idea of where to start

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