MAF disconnected , runs much better now
#1
MAF disconnected , runs much better now
Hi all,
My disco I had some idling problems and incredible fuel consumption.
After reading on the forums I decided to test MAf sensor and yesterday I disconnected it.
I felt the difference as soon as I start driving it. Its much smooth and responsive with MAf disconnected. I pushed it to 4000+ Rpms and have not experienced any power loss , its running smoother then ever.
Also idling problem is almost resolved its far better than before. It used to be going up and down between 1300 to almost 0, now it does it only time to time and revs are between 600-1000.
So by these results I can safely assume that my MAf is malfunctioning right? I'll try to clean it but is there any obvious reason not to run the car with MAF disconnected?
Thanks,
VCO
My disco I had some idling problems and incredible fuel consumption.
After reading on the forums I decided to test MAf sensor and yesterday I disconnected it.
I felt the difference as soon as I start driving it. Its much smooth and responsive with MAf disconnected. I pushed it to 4000+ Rpms and have not experienced any power loss , its running smoother then ever.
Also idling problem is almost resolved its far better than before. It used to be going up and down between 1300 to almost 0, now it does it only time to time and revs are between 600-1000.
So by these results I can safely assume that my MAf is malfunctioning right? I'll try to clean it but is there any obvious reason not to run the car with MAF disconnected?
Thanks,
VCO
#2
ECM won't be able to make things run on days when conditions are far different (heat, altitude, barometric pressure, etc.) - your ECM was probably using last value recorded by MAF or a default value, so if conditions change this would not run as well. It can be easily cleaned, use a spray cleaner rated for mass air flow sensors and throttle body, etc. Also clean the throttle body inside, and fine lubricant to linkage. Very important linkage not bind. See attached pages from RAVE, you can download your own copy. In typical Rover-speak, this is the hot wire MAF sensor.
A new MAF for a 97 Disco is $1500 from Rock Auto, they can also be rebuilt for less than half that, there may be swaps, and one day while I was walking the salvage yard I found one on a donor vehicle for $25, it is on the future spares shelf. And our dismantlers could be a source.
You could also have IACV issues, vac leak, etc. And if MAF is dirty, how about a new air filter?
A new MAF for a 97 Disco is $1500 from Rock Auto, they can also be rebuilt for less than half that, there may be swaps, and one day while I was walking the salvage yard I found one on a donor vehicle for $25, it is on the future spares shelf. And our dismantlers could be a source.
You could also have IACV issues, vac leak, etc. And if MAF is dirty, how about a new air filter?
#3
ECM won't be able to make things run on days when conditions are far different (heat, altitude, barometric pressure, etc.) - your ECM was probably using last value recorded by MAF or a default value, so if conditions change this would not run as well. It can be easily cleaned, use a spray cleaner rated for mass air flow sensors and throttle body, etc. Also clean the throttle body inside, and fine lubricant to linkage. Very important linkage not bind. See attached pages from RAVE, you can download your own copy. In typical Rover-speak, this is the hot wire MAF sensor.
A new MAF for a 97 Disco is $1500 from Rock Auto, they can also be rebuilt for less than half that, there may be swaps, and one day while I was walking the salvage yard I found one on a donor vehicle for $25, it is on the future spares shelf. And our dismantlers could be a source.
You could also have IACV issues, vac leak, etc. And if MAF is dirty, how about a new air filter?
A new MAF for a 97 Disco is $1500 from Rock Auto, they can also be rebuilt for less than half that, there may be swaps, and one day while I was walking the salvage yard I found one on a donor vehicle for $25, it is on the future spares shelf. And our dismantlers could be a source.
You could also have IACV issues, vac leak, etc. And if MAF is dirty, how about a new air filter?
I'll try to clean it ASAP , I checked some stores but couldn't find anything for MAF but I found brake cleaners. Some people mentioned that brake/caliper cleaners are also fine for this procedure.
I was just about to ask how to clean T-body than found the thread woth the pictures and explanation. T-body cleaning has been added to the maintenance list.
Ps:new paper air filter installed 1 month ago ( when I bought the car) , but I saw some K&N stickers inside so MAf problem could be related to K&N filter and over oiling.
#7
anything really...
my personal preference (after many many successful installs - we just finished up a 92 syncro vw passat with a 20v turbo motor this weekend actually... took just under 2 days from start to finish) is megasquirt.
its the first thing im gonna do if/when i have a similar issue with my truck
dont mean to derail the thread though!
my personal preference (after many many successful installs - we just finished up a 92 syncro vw passat with a 20v turbo motor this weekend actually... took just under 2 days from start to finish) is megasquirt.
its the first thing im gonna do if/when i have a similar issue with my truck
dont mean to derail the thread though!
#8
Depends on where you are at. An MS install wouldnt pass muster with the smog ***** here in CA on an OBD2 car. You might stand a chance if you were to swap it into a distributor truck and managed to utilize the stock sensors and ECU to house the MS install. As long as it passes visual and you have it tuned well enough to pass the sniffer test it would probably manage to squeak by..
#10
Depends on where you are at. An MS install wouldnt pass muster with the smog ***** here in CA on an OBD2 car. You might stand a chance if you were to swap it into a distributor truck and managed to utilize the stock sensors and ECU to house the MS install. As long as it passes visual and you have it tuned well enough to pass the sniffer test it would probably manage to squeak by..
easy enough with a plug and play harness...
weve done this before on other MS'd cars. as long as the engine setup is sooo wild that the factory ecu cant handle at least running it through a smog check as a worst case.
otherwise, another easier option if you dont have to have the ecu actually scanned, is to tune it to pass smog and keep the cat in. everything can look stock enough under the hood