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post #16 of 20 (permalink) Old 12-24-2018, 03:20 PM Thread Starter
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Ok so it finally threw codes today. P0174 p0171 p0440. I guess start with replacing the MAF? I see fuel injector seal on the p0714 as a option after MAF which one of you guys mentioned before...the p0171 I'm not sure cuz it's got a list of things, but MAF being first
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post #17 of 20 (permalink) Old 12-25-2018, 05:13 AM
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Ok so it finally threw codes today. P0174 p0171 p0440. I guess start with replacing the MAF? I see fuel injector seal on the p0714 as a option after MAF which one of you guys mentioned before...the p0171 I'm not sure cuz it's got a list of things, but MAF being first
171 & 174 means you have a vacuum leak. Check your hoses. The 440 is evap leak and will not effect running. It may even be caused by the main vacuum leak.
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post #18 of 20 (permalink) Old 12-25-2018, 02:57 PM Thread Starter
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I checked hoses this morning and none are cracked. I hit most of them with carb cleaner and no change in idle. Is it possible it threw these codes from when i seafoamed through the pcv vacuum line into the intake ? It seems to be lagging now forsure tho
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post #19 of 20 (permalink) Old 12-25-2018, 05:23 PM
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I checked hoses this morning and none are cracked. I hit most of them with carb cleaner and no change in idle. Is it possible it threw these codes from when i seafoamed through the pcv vacuum line into the intake ? It seems to be lagging now forsure tho
If that is the case it should cycle out. Try clearing and doing a drive cycle. If they come back. You still have a leak.
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post #20 of 20 (permalink) Old 12-26-2018, 05:03 AM
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I checked hoses this morning and none are cracked. I hit most of them with carb cleaner and no change in idle. Is it possible it threw these codes from when i seafoamed through the pcv vacuum line into the intake ? It seems to be lagging now forsure tho
There are vacuum hoses under the intake manifold. There is a recent thread with roughly the same problem, but his was a rough idle.

https://www.my.is/forums/f87/new-is3...issues-605741/
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