On a turboed 96-98 2.4L i hear that you should use a check valve for the map sensor. Now if you do that will the map be able to read the EGR gases comming into the manifold? or will there be a check engine light? Do anyone here have a turboed 96-98 2.4L with the EGR and no check engine light?
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so is anyone running boost on a 96-98 2.4L and not getting a check engine light from the EGR?
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I am a Turboed 96...
I had the EGR Simulator but it made the car run horribly and took it off...I also have it all disconnected and blocked off since I have a 2001 block...
Theres no real solution for our 96 cars with the egr and no CEL for the egr...
As for the check valve you should run it so the MAP doesnt see boost...
^ what jay said is what i would have said.
Shifted wrote:The EGR and MAP are two completely different things. The MAP doesn't measure anything with the EGR...
Doesnt the MAP see the change in pressure when the EGR opens and closes?
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Shifted wrote:The secrets of the MAP sensor are revealed by its name...
Manifold Air Pressure
It measures the pressure inside the intake manifold.
The 2k+ have MAP's, and we don't have EGR's...
Am i missing something here. The EGR feeds into the manifold, wouldnt the MAP sense that?
Isnt that that why you tap into the MAP wires for the EGR sim? To make the MAP think there EGR is working?
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lol, shifted's not thinking....
One..... I do not believe in check valving the MAP sensor...... Jake, you have a check valve on your MAP?
If you insist on running one, it should be T 'ed into the MAP line...... allowing boost pressure to vent to atmosphere.....
This check valve will have no effect on the MAP seeing a pressure change from the EGR opening, since its not a positive pressure from the EGR, its just a loss of vacuum.
The 2.4 computer judges the EGR's movements by using the MAP to sence changes in Vacuum..... thats why if you pull the EGR out of the system, but keep it plugged in, the computer still finds out its not doing its job. The EGR says 'Hey, I'm working overe here.' and the MAP says 'No your not, you dipsheit.'....... and the ECM looks at the facts and says.......'EGR, your a lazy POS..... your not allowing any exhaust to flow through into the intake'........ and the ECM turns on the CEL.
the end.
SPD RCR Z -
'02 Z24 420whp
SLO GOAT -
'04 GTO 305whp
W41 BOI -
'78 Buick Opel Isuzu W41 Swap
Oh yea..... the reason behind my not check valving the MAP.....
The stock MAP sensor is designed to read Atmospheric Pressure. It gives voltage values (up to 5v) to each measurement (not sure how far it breaks it down). 5v being Atmospheric pressure. Since it has no means to judge boost pressure, it can only send 5v back to the ECM, and the ECM knows that this MAP says 5v. is Atmospheric Pressure. The only way I could see a reason to put a check valve on the MAP is if positive pressure would be able to damage the sensor itself, but I dont see that happening (the syle MAPs we use are constructed the same way as the 2 bar maps).
SPD RCR Z -
'02 Z24 420whp
SLO GOAT -
'04 GTO 305whp
W41 BOI -
'78 Buick Opel Isuzu W41 Swap
no check vavle on my map sensor hose.
so does the EGR work on a 2.4 that is running boost?
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