No vacume to the erg

Mass Air Flow sensor just measures incoming air flow at a predetermined rpm/load. The computer is saying the flow measurement is not correct. This can be caused by mechanical faults within the engine like a bad valve seat or timing chain but would generally be accompanied by backfires through the intake. Usually its caused by a vacume leak between the sensor and the intake valve,like the intake manifold,loose intake pipe clamps, broken vacume lines,a leaking vacume brake booster [it will hiss loud when you apply the brake],bad spark plugs/wires, a clogged catalytic converter, stuck open egr valve or pcv valve,bad oxygen sensor or even a very clogged air filter. I know there is a lot listed but the MAF or MAP sensors show general flow through the engine that can be affected by several things. A vacume tester from your local auto parts store is about 30bucks and usually has instructions how to test for vac. leaks within the engine also to determine a if thers is bad valve seat or clogged exhaust.

I have the same problem with my ZX2. First you have to find out what engine you have to find out what emission control system you have. if you have a ERG valve clean it and your throttle body. Throttle body cleaner is under 10 bucks at autozone. If you don't have an ERG valve you might need a new idle air control it is 100 bucks at autozone and on the ztec engine it is bolted underneath the throttle body. you should also clean your mass air flow sensor which is located in your air cleaner right behind your air filter, after all of that check all your vacuum lines for leaks and if that does not fix it you might need a new PCV valve this one is pretty cheap about 5 dollars.

Need more information to help solve this problem.
You mean speed of air flow or direction of air flow?
-If direction of air flow no change that mean:
1. Cable from the knob to control door is slip off or if the system is control by vacum. The vacum line is leak or slip off.
-If the peed stay same even move the switch to hight or low:
1. Bad switch.


Mai Lor

The air direction is vacum controlled. If you have 4X4 and ESOF ( switch in the cab) then you need to inspect the vacum lines that go to the hubs and possibly the hub seals. "default" position for air flow is the defrost position. If you DON'T have 4X4, and it's a diesel engine, inspect the vacum pump, If it's a gas engine then look at all the vacum lines from the intake manifold for a leak.

erg valves are fairly simple to replace, its located in the rear compartment of the engine, just make sure to check all vacume lines for cracks when replacing.

If you can seem to find it have a pro do it, its cheap.

could be MAF mass air flow sensor or your MAP sensor manifold absolute pressure. check for a cracked or worn hose going to the Map i had found a crack in mine one time. if its the MAF just see if you disconnect it and if the trouble stays the same then thats probably the problem..they should have been able to tell you what the code it said...was it calling out for? Some auto stores will lone this tool out as long as you hand them your drivers licence..but dont expect them all to do this.

these hoses are 4 the fuel emission syatem on the mtr they are vacume

check all vacum lines starting with the pcv valve vacum line. check while engine is running ,lisen for air leak.if u have a vacum leak then this will set these codes.

check the pcv valve vacum lines for a leak a vacum leak will set 171 174 codes. lift the hood with engine running and listen for a air leak , check all vacum lines if no vacum leaks can be found then clean the mass air flow sensor by spraying carb cleaner directly on it for about 5 seconds. in other words take the air filter cover up and spray down the tube that leads to engine. shine a light down hose first and see if u can see the mass air flow sensor so u can get a direct hit

there is a vacum line off in the dash. The controles for your air flow are all vacume oparated so its no biggey just take out your dash cluster by that I meen your heater and stareo and find wich hose is off and put it back on.