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V7 sti rough idle and cel


Gavman

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My v7 has just started idling super rough and I have a check engine light. I took it for a test drive today and it seems fine. It appears to only be an idle issue. I havn't had a chance to run the codes yet. I replaced my o2 sensor as it was visibly damaged and the wires were not in good shape. Seemed to help a small amount. I have cleaned the maf and I'm certain I have no vaccum leaks.

What other things could it be? Obviously need to get the codes ran but havn't had a chance yet.

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 Gavman said:
My v7 has just started idling super rough and I have a check engine light. I took it for a test drive today and it seems fine. It appears to only be an idle issue. I havn't had a chance to run the codes yet. I replaced my o2 sensor as it was visibly damaged and the wires were not in good shape. Seemed to help a small amount. I have cleaned the maf and I'm certain I have no vaccum leaks.

What other things could it be? Obviously need to get the codes ran but havn't had a chance yet.

Does the car almost stall when you tap the throttle and wait for the revs to stabilize?

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 Gavman said:
Yeah it does

The exact same thing was happening to me. I replaced the o2 sensor, changed fuel filter and cleaned injectors but nothing seemed to work and then did a smoke test and found a vaccum leak post maf on the turbo inlet.

To find the vacuum leak, I bought a $40 dollar smoke/fog machine and attached a hose on the outlet and pumped it in the intake after blocking it off. If you see any smoke coming out then you have a leak. I should have done this first instead of buying a new o2 sensor because sensor was 300 bucks haha.

My comments are based on my personal experience but best to get a code reader first and see what is going on.

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 KingCole said:
The exact same thing was happening to me. I replaced the o2 sensor, changed fuel filter and cleaned injectors but nothing seemed to work and then did a smoke test and found a vaccum leak post maf on the turbo inlet.

To find the vacuum leak, I bought a $40 dollar smoke/fog machine and attached a hose on the outlet and pumped it in the intake after blocking it off. If you see any smoke coming out then you have a leak. I should have done this first instead of buying a new o2 sensor because sensor was 300 bucks haha.

My comments are based on my personal experience but best to get a code reader first and see what is going on.

cheers for the info man. I'll take a closer when I get home. Here's hoping haha

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Ok so I had a search around. The turbo inlet hose had a rip right on the hose clamp on the turbo housing end so I replaced that with a new tomei one. That didn't fix it at all really (even though it had to be replaced anyway) I read the codes and its only throwing P0159 idle air system performance. We had another search around and whilst cleaning and checking the IACV I found that the motor has seized/died or whatever. Manually held the valve in place and idle returned to normal. So I just need to grab a replacement when I get a chance.

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