2001 zx3 slight hesitation/surge under light accel - Page 2 - Focus Fanatics
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Old 07-03-2013, 11:04 AM   #11
Milton
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Unless I am wrong:
- The air is flowing from the valve cover into the air box.
- Atmospheric air also flows into the air box.
- All air in the air box flows from the air box, past the MAF and into the combustion chambers.
- The MAF meters all air flowing from the air box to the combustion chambers.

Am I wrong?
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Old 07-03-2013, 11:35 AM   #12
akatagyourit
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Quote:
Originally Posted by Milton View Post
Unless I am wrong:
- The air is flowing from the valve cover into the air box.
- Atmospheric air also flows into the air box.
- All air in the air box flows from the air box, past the MAF and into the combustion chambers.
- The MAF meters all air flowing from the air box to the combustion chambers.

Am I wrong?
If I plug the hose of the valve cover port with my finger it has a suction at idle, and lessens as the rpms go up. If that is the case though then we're taking air that has been metered pulling it through the system and reintroducing it back to the maf as dirty oily air on maf sensor. So we'd be causing the motor to run richer.
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Old 07-03-2013, 11:43 AM   #13
jdmzx5
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The fresh air hose pulls air from the air filter box into the valve cover through the crank case into the pcv valve through the intake. The pcv valve is a metered leak the pcm software is programmed for. The cone filter on the maf requires a reprogram due to the increased air flow to the maf.
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Old 07-03-2013, 12:01 PM   #14
lowzts
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I have same the same issue with my 02 zts with zetec. I put a "breather" filter on the end of my valvr cover breather and have been running a cone filter as mentioned above for about 4 yeats and have not had this issue. I have been told that the DPFEE sensor can be bad?

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Old 07-09-2013, 05:49 PM   #15
lowzts
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I changed the camshaft positioning sensor and the crankshaft positioning sensor then "poof" hesitation stopped. Cost like $60 and some patience. Hope this helps

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