1 direction check valve, this line goes from the intake manifold to your a vacuum resevior in your dash, when running, car pulls vacuum which allows you operate AC vent flaps. Under hard gas, vacuum decrease, to prevent your vent flaps go crazy while driving, this valve shuts and hold vacuum in the resorvior.
If this thing goes bad your flap will move randomly during hard acceleration, if the line is cracked, engine will suck un-meterd air through there, could cause lean code.
A good way to find out is to take it off, and blow air through it, air should only go through 1 way. Another sign is when you shut off car, you will hear a quick vacuum sucking sound in the cabin.
Any generic check valve will do the job, just need to come up with some plumbing work.
https://preview.redd.it/5iy1ypwwba5d1.jpeg?width=1706&format=pjpg&auto=webp&s=d797dd04eee427d15a40820c3d4cbffda1532e47
Replaced mine years ago, looks like they changed plumbing in later models but principles should be same. :)
The CEL is how you know your engine is running. Joking aside, it's basically meaningless. As long as it still runs decent and you're getting good gas mileage there's no reason to sweat.
If you can get the obd1 system 240s have to throw a cel something is definitely wrong. Ive only had it light and stay lit with major sensors broken or unplugged like maf or O2
Maintains vacuum in the heater flap vacuum chamber when you floor it and manifold vacuum drops closer to ambient.
[https://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm](https://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm)
Read the FAQ, as it helps. Ask at6 the brickboard RWD forum.
[https://www.brickboard.com/RWD/](https://www.brickboard.com/RWD/)
Fuel trim issue as detected by the oxygen sensor. Maybe an air intake vacuum leak? Of a fault in the oxygen sensor that you can test with your digital multimeter.
You know how to check OBD for codes? Any faults in socket sic (ignition, EGR if equipped.
1 direction check valve, this line goes from the intake manifold to your a vacuum resevior in your dash, when running, car pulls vacuum which allows you operate AC vent flaps. Under hard gas, vacuum decrease, to prevent your vent flaps go crazy while driving, this valve shuts and hold vacuum in the resorvior. If this thing goes bad your flap will move randomly during hard acceleration, if the line is cracked, engine will suck un-meterd air through there, could cause lean code. A good way to find out is to take it off, and blow air through it, air should only go through 1 way. Another sign is when you shut off car, you will hear a quick vacuum sucking sound in the cabin. Any generic check valve will do the job, just need to come up with some plumbing work.
OBD is giving a 1-1-3 code. Not sure if this helps.
Do you know how to reset the codes? I'm pretty sure you have to reset them manually. That should get the light to go out.
Air pump check valve
https://preview.redd.it/5iy1ypwwba5d1.jpeg?width=1706&format=pjpg&auto=webp&s=d797dd04eee427d15a40820c3d4cbffda1532e47 Replaced mine years ago, looks like they changed plumbing in later models but principles should be same. :)
The CEL is how you know your engine is running. Joking aside, it's basically meaningless. As long as it still runs decent and you're getting good gas mileage there's no reason to sweat.
except for states like mine where you can't pass inspection if the light is on
My state they do a tailpipe test for pre-OBD2 cars and I haven't had any problems with the light on
If you can get the obd1 system 240s have to throw a cel something is definitely wrong. Ive only had it light and stay lit with major sensors broken or unplugged like maf or O2
My 740 has LH 2.4 and the CEL has been on for about 2 years. It passed the emissions test like that too
Whats the code?
Beats me. I haven't bothered to flash it out
Dinglevalve. It's basically benign unless you remove it and all your dingles get through causing a need for a shady explanation to a garage.
Maintains vacuum in the heater flap vacuum chamber when you floor it and manifold vacuum drops closer to ambient. [https://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm](https://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm) Read the FAQ, as it helps. Ask at6 the brickboard RWD forum. [https://www.brickboard.com/RWD/](https://www.brickboard.com/RWD/) Fuel trim issue as detected by the oxygen sensor. Maybe an air intake vacuum leak? Of a fault in the oxygen sensor that you can test with your digital multimeter. You know how to check OBD for codes? Any faults in socket sic (ignition, EGR if equipped.
That’s thingamajig it connects to the doohickey