Map Sensor Problem
Thread Starter
Launching!
Joined: Jul 2003
Posts: 237
Likes: 0
From: Ft. Worth, TX
Map Sensor Problem Ok did a cam swap into a 02 WS6 running a 226-226 cam standard bolt-ons and supporting mods. For some reason I keep getting Map Sensor codes in the computer, which in turn throws lean codes and makes the car run like crap.
The car gets the normal blow-by with the pcv system. I am thinking that over time it is plugging the sensor, and causing me to have to change it. Has anyone else had this problem or any ideas on a good fix? I was thinking maybe trying a catch can set-up to help with the blow-by in the pcv system but thought I would check here first to see. Any ideas and inputs a greatly appreciated.
Thanks
Brandon
The car gets the normal blow-by with the pcv system. I am thinking that over time it is plugging the sensor, and causing me to have to change it. Has anyone else had this problem or any ideas on a good fix? I was thinking maybe trying a catch can set-up to help with the blow-by in the pcv system but thought I would check here first to see. Any ideas and inputs a greatly appreciated.
Thanks
Brandon
Thread Starter
Launching!
Joined: Jul 2003
Posts: 237
Likes: 0
From: Ft. Worth, TX
It's been tuned and runs just fine, until that code pops then runs like crap. It will run good for about 6 months with the new sensor in it, then throw the code and run like crap. Replace it and runs like a champ till it gets the code again. I'm not saying it can't be the tune, but if it was the tune it would do it all the time correct?
Thanks for the input so far
Thanks for the input so far
On The Tree
Joined: Dec 2004
Posts: 100
Likes: 0
From: Satellite Beach, fl
Originally Posted by silverbullet00
I'm not saying it can't be the tune, but if it was the tune it would do it all the time correct?
Thanks for the input so far
Thanks for the input so far
Thread Starter
Launching!
Joined: Jul 2003
Posts: 237
Likes: 0
From: Ft. Worth, TX
Never thought of it being seasonal. The tune was done last spring then started once it got hot. Could be why now that it is starting to get cooler here in the midwest that it seems to be running ok for the time being. Sounds like I may need to get it re tuned then, but should I do it now or wait till it gets hot again?
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If the PCM faults the MAP sensor it may ignore it and go
into a "limp home" mode that is just not very accurate.
Some of the MAP codes are indeed judgements about
MAP based airflow accuracy or MAP reading vs TPS, RPM
and so on and the result will be bent by the cam. Get the
list together and knock them down one by one. The ones
about "disagreeing" you want to widen out some limits,
only a hard MAP fault needs hardware replacement. If you
see 100kPa (or whatever is local barometric) at key on,
not running and some other value (maybe 30-80kPa at
idle, depending on RPM and cam) the sensor is working.
Oil should not hurt a MAP sensor unless it's coked up hard
and that's unlikely. It's a ceramic diaphragm or something
like that, just pressure and deflection matter (not like a
hot wire MAF that's all full of fussy embedded thermal
and air distribution assumptions).
into a "limp home" mode that is just not very accurate.
Some of the MAP codes are indeed judgements about
MAP based airflow accuracy or MAP reading vs TPS, RPM
and so on and the result will be bent by the cam. Get the
list together and knock them down one by one. The ones
about "disagreeing" you want to widen out some limits,
only a hard MAP fault needs hardware replacement. If you
see 100kPa (or whatever is local barometric) at key on,
not running and some other value (maybe 30-80kPa at
idle, depending on RPM and cam) the sensor is working.
Oil should not hurt a MAP sensor unless it's coked up hard
and that's unlikely. It's a ceramic diaphragm or something
like that, just pressure and deflection matter (not like a
hot wire MAF that's all full of fussy embedded thermal
and air distribution assumptions).
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