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Old 08-09-2019, 10:56 AM   #1
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Running lean without codes?

Now that my 04 is up and running with a new timing belt and copper plugs I suspect I'm running lean with no codes. The plugs I pulled out were gray. Granted I have not gone full throttle yet. I'm noticing a low rpm stumble that clears at 4000 rpm. I cleaned the maf sensor. Idle is steady. Im suspecting a vacuum leak somewhere. Replaced all of the vacuum lines but haven't pulled the intake to check for damage. I did experience a backfire when I first tried to start the car after I bought it so i may have a damaged gasket or boot.


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Old 08-14-2019, 01:41 PM   #2
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I just got my ‘02 figured out. I was running extremely lean, that the car wouldn’t even idle. Long story short it was the rubber intake connectors behind the fuel rail. Very easy fix. 2 8mm bolts holds the fuel rail in place. Disconnect electrical connections to injectors first. Pull the fuel rail off, and make sure the o-rings on the injectors stay on when you remove the rail. There’s also 2 plastic vacuum lines to disconnect as well. This will give you a clear view of the 4 rubber connectors. I loosened all 8 clamps just enough to take pressure off the hoses, grabbed the backside of the intake and pulled it towards me until the hoses sat in their proper position then tightened the clamps down. Hope this helps.
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Old 08-14-2019, 06:17 PM   #3
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I just got my ‘02 figured out. I was running extremely lean, that the car wouldn’t even idle. Long story short it was the rubber intake connectors behind the fuel rail. Very easy fix. 2 8mm bolts holds the fuel rail in place. Disconnect electrical connections to injectors first. Pull the fuel rail off, and make sure the o-rings on the injectors stay on when you remove the rail. There’s also 2 plastic vacuum lines to disconnect as well. This will give you a clear view of the 4 rubber connectors. I loosened all 8 clamps just enough to take pressure off the hoses, grabbed the backside of the intake and pulled it towards me until the hoses sat in their proper position then tightened the clamps down. Hope this helps.
Thanks! I'll check that out.
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Old 08-15-2019, 08:02 AM   #4
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Smoke test helps a lot , get a cigar , take big mouth fulls and blow it into a Vac line you know is good going into the intake , takes 3-4 , do this someplace dim lit with a good shop light and watch for smoke , engine off

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Old 08-15-2019, 09:17 AM   #5
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Smoke test helps a lot , get a cigar , take big mouth fulls and blow it into a Vac line you know is good going into the intake , takes 3-4 , do this someplace dim lit with a good shop light and watch for smoke , engine off

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Thanks. I'll do that. Will be ordering a tune from you this weekend. It could have been the NGK plugs. Other than the low rpm stumble, it seems to be running very well. Ran it up to 115 at 1/2 throttle. Idle is 800 and very steady. No codes.
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Old 08-15-2019, 06:49 PM   #6
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Motorcraft sp463 get rid of those NGK lol

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Old 08-15-2019, 09:12 PM   #7
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Motorcraft sp463 get rid of those NGK lol

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I'm running the 463's now. The NGK'S were the plugs that looked gray.
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