loopy idle and stalling issues at stop lights-03 svt VACUUM LEAK maybe?? - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
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Old 05-02-2011, 09:23 AM   #1
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Question loopy idle and stalling issues at stop lights-03 svt VACUUM LEAK maybe??

Did a tune up this weekend;
  1. replaced broken primary O2 sensor
  2. rotated spark plugs (one was fouling)
  3. changed oil


Now the car has a bad idle, and is stalling when i take out of gear when i come to a stop light. I assume it's an vacuum leak, because i scanned the car and i got a P0171 (system lean-Bank 1) "pending" code.

But my question is, could a leaking exhaust gasket (cat meets header) cause this? Or maybe a misfire at idle from that fouling spark plug i rotated?

I also checked all my vacuum lines, and even removed/inspected the TB. Has anyone ever has a vacuum leak on the rubber boots that connect the 2 pice of the DSI manifold?


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Old 05-02-2011, 11:14 AM   #2
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I just had this exact problem. Turned out to be a vac leak in the intake manifold couplers. Grab a can of ether from walmart or autoparts store and spray it around the boots. If you have a vac leak you should hear your idle race up. Im almost guaranteeing this is the culprit.
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Old 05-02-2011, 01:48 PM   #3
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What do you mean by rotating the spark plugs?

I know someone very recently had a vac leak and it turned out to be one of the couplers.
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Old 05-02-2011, 04:40 PM   #4
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Check the lines from the pvc to intake manifold
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Old 05-02-2011, 06:40 PM   #5
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What do you mean by rotating the spark plugs?

I know someone very recently had a vac leak and it turned out to be one of the couplers.
I rotate them like rotating the tires, i wanted to see if it was the plugs or my cyc#1 wire. it was the wire.


How did they fix the leak? or i they just buy the kit from CFM?

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Check the lines from the pvc to intake manifold
i don't run a line to my PVC, that puddles oil and water in the intake mani. I just dump in the fenderwell.
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Old 05-02-2011, 06:50 PM   #6
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I was the one with the Vac leak. I bought the coupler kit from CFM and installed. Spend the 2.00 dollars and buy some starting fluid from walmart and spray it on each coupler. If you hear the engine rev up a little you found your leak.
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Old 05-02-2011, 08:12 PM   #7
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Vac leak

I had a same experience when I first got my 03 svt. Check the vac lines that run over to the evap solenoid on the rear pass. side of eng. compartment. Two of my lines were rubbing and developed a hole. good luck.
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Old 05-02-2011, 08:36 PM   #8
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I was the one with the Vac leak. I bought the coupler kit from CFM and installed. Spend the 2.00 dollars and buy some starting fluid from walmart and spray it on each coupler. If you hear the engine rev up a little you found your leak.
how hard was the installation?

does the kit include everything for the job?

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I had a same experience when I first got my 03 svt. Check the vac lines that run over to the evap solenoid on the rear pass. side of eng. compartment. Two of my lines were rubbing and developed a hole. good luck.
i'll do that
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Old 05-03-2011, 08:14 AM   #9
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INstallation was easy, make sure you have a friend with you to help push back the manifold to slip the couplers on. And yes it comes with everything you need, 4 couplers, 8 clamps and CFM sticker to seal the deal. Since all my symptoms and even CEL code was the same im guessing this is your exact problem. But like I said before buy starting fluid and spray each boot listen for the idle to raise. Dont waste your money on the couplers only to find out it was not them and something else is leaking. Keep us all informed! I hope I helped!
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Old 05-03-2011, 11:57 AM   #10
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If u don't run a pvc line check what ever u plugged the intake mani with lol. Spraying the lines will help find the problem on a vacuum leak.
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