Quote:
Originally Posted by 3dplane
Having a MAP sensor does not automatically exclude any other sensor! Can you show me any engine that has a mass airflow sensor but does NOT have a MAP sensor? You are probably right though on the OP's car,considering it's age it probably fully relies on the MAP sensor. Which can also have a condition where a vacuum leak creates a RICH condition (instead of lean!) if the MAP sensor is remotely located from the intake plenum,connected with a vacuum line that has cracked or broken. There will be low vacuum reading to the ECU "telling" it to dump fuel because this guy has the throttle nailed! (despite being equipped with a TPS ) I have seen this personally.
BTW thanks for the name Vane Air Flow! So that's what it's called! 
Barna |
Really? There are two primary ways to determine the mass air flow entering the engine. Either by measuring manifold pressure (with a MAP sensor) and temperature or by measuring the mass air flow directly (with a MAF or VAF, both serve the same purpose). These are two separate ways of determining air flow and manufacturers aren't going to add parts for no reason, so they are generally mutually exclusive.
I say generally, because I've heard of a *few* newer, turbocharged cars that use both, such as the Mitsubishi Lancer Evo X.
I'm not going to list all the cars that have a MAP but no MAF cause I'd be here all day researching and making a very lengthy list. So, I'll limit it to one:
Ya know, the OP's car.