Bad maf?
Thread Starter
Burning Brakes
Joined: Oct 2004
Posts: 999
Likes: 9
From: Floyds Knobs Indiana
possible bad maf?
Details
Procharged 03 z06
tial 50 bov
Cam
The problem I am having is the car idles fine. The fuel trims are perfect. It revs up good but when it comes down it either dies or just sits there barely running. The bov is open in vacuum and closed during boost. The maf is reading like it should and is linear, doesn't jump around. If you unplug the maf the car revs and catches itself perfectly.
Any ideas guys.
Procharged 03 z06
tial 50 bov
Cam
The problem I am having is the car idles fine. The fuel trims are perfect. It revs up good but when it comes down it either dies or just sits there barely running. The bov is open in vacuum and closed during boost. The maf is reading like it should and is linear, doesn't jump around. If you unplug the maf the car revs and catches itself perfectly.
Any ideas guys.
Last edited by idontknow; Jul 14, 2014 at 06:26 PM.
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
Details
Procharged 03 z06
tial 50 bov
Cam
The problem I am having is the car idles fine. The fuel trims are perfect. It revs up good but when it comes down it either dies or just sits there barely running. The bov is open in vacuum and closed during boost. The maf is reading like it should and is linear, doesn't jump around. If you unplug the maf the car revs and catches itself perfectly.
Any ideas guys.
Procharged 03 z06
tial 50 bov
Cam
The problem I am having is the car idles fine. The fuel trims are perfect. It revs up good but when it comes down it either dies or just sits there barely running. The bov is open in vacuum and closed during boost. The maf is reading like it should and is linear, doesn't jump around. If you unplug the maf the car revs and catches itself perfectly.
Any ideas guys.
Thread Starter
Burning Brakes
Joined: Oct 2004
Posts: 999
Likes: 9
From: Floyds Knobs Indiana
Before the innercooler, we did have it after but was having problems. So we moved it to before and still have the same problem. Doug at ecs says that I probably need a screened maf
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
I prefer to SD tune the car, but if you're on a budget, the Halltech honeycomb screen should stabilize it by making the airflow more linear across the element. Have you pressure checked for a leak behind the MAF by chance?
Thread Starter
Burning Brakes
Joined: Oct 2004
Posts: 999
Likes: 9
From: Floyds Knobs Indiana
The car won't even move with the maf hooked up. Unplug it and it runs fine. My tuner doesn't like speed density cause of the weather change it throws off the tune. Now if I was running 2 boost settings it would be SD.
Maf will hold a solid 3.xxx, bit the gas, and it shoots up to 5-6 then back down to 3.xxx and slowly climbs. If you hold it at 3k rpms it will be rock solid then either jump up or shoot down on the maf reading then back to rock solid
Maf will hold a solid 3.xxx, bit the gas, and it shoots up to 5-6 then back down to 3.xxx and slowly climbs. If you hold it at 3k rpms it will be rock solid then either jump up or shoot down on the maf reading then back to rock solid
Safety Car
Joined: Aug 2000
Posts: 4,537
Likes: 84
From: St. Joseph MO
Cruise-In III Veteran
Cruise-In IV Veteran
The car won't even move with the maf hooked up. Unplug it and it runs fine. My tuner doesn't like speed density cause of the weather change it throws off the tune. Now if I was running 2 boost settings it would be SD.
Maf will hold a solid 3.xxx, bit the gas, and it shoots up to 5-6 then back down to 3.xxx and slowly climbs. If you hold it at 3k rpms it will be rock solid then either jump up or shoot down on the maf reading then back to rock solid
Maf will hold a solid 3.xxx, bit the gas, and it shoots up to 5-6 then back down to 3.xxx and slowly climbs. If you hold it at 3k rpms it will be rock solid then either jump up or shoot down on the maf reading then back to rock solid
Thread Starter
Burning Brakes
Joined: Oct 2004
Posts: 999
Likes: 9
From: Floyds Knobs Indiana
OK
Thread Starter
Burning Brakes
Joined: Oct 2004
Posts: 999
Likes: 9
From: Floyds Knobs Indiana
little update:
well the BOV was to close to the maf. we moved the BOV before the innercooler and got a new maf with a screen and it is reading perfectly. the new problem we are having is no matter what my tuner does to the tune the car wants to die coming off a rev or coming to a stop. it will recover 99.9% of the time and only lasts about a second or 2.
he has logged it to see what is going on and there shows nothing in the log as to why it is happening. all i can come up with is that the BOV is blowing off to much air and suffocating the motor.
well the BOV was to close to the maf. we moved the BOV before the innercooler and got a new maf with a screen and it is reading perfectly. the new problem we are having is no matter what my tuner does to the tune the car wants to die coming off a rev or coming to a stop. it will recover 99.9% of the time and only lasts about a second or 2.
he has logged it to see what is going on and there shows nothing in the log as to why it is happening. all i can come up with is that the BOV is blowing off to much air and suffocating the motor.
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