Running an 86 without the M.A.S. ???
Posted 10 April 2004 - 11:52 PM
i just got an 86 starion and I've been digging around online for info and such (as well as tooling around on the starion)
I read that the 86 can run without the MAS so I took it off and tried it, and, well, IT WORKED.
I just don't understand HOW or WHY it worked.
can some one please post some details to this occurance and any benefit/downsides to not using the M.A.S.?
because if I dont really need it, i'm just gonna fab up some intake tubing/filter and be done with it.
Posted 11 April 2004 - 12:08 AM
Either the ECU or the MAS it's self was allowed to function w/ out the air flow inputs.
With out metered air readings the ECU will not change the injector in regards to air flow but engine temp and 02 readings from the oxygen sensor this may allow for quicker response and allow for less errors in fuel air mixtures.
Posted 11 April 2004 - 07:19 AM
they used manifold pressure to determine load. this along with tps are the main driveability inputs.
the 86 uses a pressure sensor(map sensor) along with the mas.
mass is better for throttle response and wot performance. its nice to have both, when the mass fails the car is still driveable.
Posted 11 April 2004 - 01:11 PM
I have a 6/85 (1986) LE ; It uses a Manifold Absolute Pressure (MAP) sensor.
I unplug my (MAS) Mass Airflow Sensor and the car just dies immediately it will crank but it won't start.
Plug the MAS back in and it will start right up.
I think GREENSTAR has a 86 ESI (intercooled) that is able to run w/out the MAS ?
Maybe the intercooled models for 86 were the only ones that are able to do this because the values in air temp or atmospheric pressure were too variable ?
mike_c would be a good person to add to this thread.........
patra_is_here is your vehicle an intercooled model ?
Posted 11 April 2004 - 03:46 PM
Posted 11 April 2004 - 04:38 PM
its an esir.
its black with red interior.
Posted 11 April 2004 - 05:37 PM
Posted 11 April 2004 - 09:33 PM
Even in the later years Mitsu kept monkeying with ECUs; that's partly why some 88/89 cars boost cut at different RPMs. In 87, Mitsu deleted the boost pressure sensor completely so all the speed-density limp-home stuff ended up in the trash. Note too that in the 85/86/87 timeframe Mitsu re-did several of their cars, including the Colts, to have a Starion-like throttle body injection system. Engineers concentrated on making regular mode (i.e. not the limp-home) equations/curves/tables for all the other cars... as opposed to spending time fine-tuning limp home modes.
Since the MAS is the main input to the ECU, a dead MAS pretty much keeps the car from starting/running. Except for some 86s.
Posted 05 May 2004 - 10:37 PM
Posted 05 May 2004 - 11:05 PM
Not as much the year/month of production of the vehicle it's self as the negation of the MAS from the drivability/emissions acceptance equation.
June is generally accepted as the begining month of production for the following year models. There maybe some 6/86's out there that can operate minus the MAS ?
As well as 5/85's ?
Posted 10 May 2004 - 09:13 AM
MBC/F.cutDef./1st gen airbox/Nitr.Express
Posted 29 May 2004 - 11:30 PM
Posted 21 November 2004 - 02:09 AM
Posted 05 December 2004 - 03:15 PM
Posted 05 December 2004 - 04:28 PM
There is a large black canister that holds the air filter.
on that canister is a square shaped electrical plug.
Unplug that plug and if your car runs with out it plugged in then your good to go.
The 02 sensor is behind the turbo on the down pipe next to the fire wall just before the precat don't touch unless you have to.
Have you uploaded the 88 online service manual yet ?
It's at the top of the page in the FAQ section.
Posted 05 December 2004 - 07:12 PM
Posted 05 December 2004 - 08:20 PM
The heat temp sensor... what ?? :
Posted 05 December 2004 - 08:59 PM
Posted 06 December 2004 - 10:05 AM
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users