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Un-do the hose clamp on the air box and the one on the throttle body, carefully disconnect the MAS sensor plug at the top of the hose... remove the hose and inspect it for cracking or breaks. Very common... This condition causes un-metered air to enter the system. The new part is about $80.00 on ebay. It will likely come with a new MAS sensor. JUST BE SURE AND DOUBLE CHECK THE AIR FLOW DIRECTION arrow on the sensor. The last one I did, the part was good but the sensor was installed backward. Took me a while to find that problem.
First off, is it diesel, or gas? Does it start better when warm? Volkswagens ( I've owned 5) are notorious for electrical problems ( starting relays/injector plug relays). You didn't say that you replaced the fuel injectors, (on diesels they are quite expensive, but can be rebuilt if they prove to be defective). Have you had anyone check it on their computer?( if you changed your timing belt, your injector pump on the diesel could be badly out of time). Fuel hoses / clamps also tend to leak and allow air into the system ( fuel filter/ fuel tank pump on gasoline) which is almost the kiss of death for diesels ( they seem to be very adverse to air bubbles in the injection pump). Your solenoid shutoff switch on the fuel pump may also be sticking ( mine wouldn't allow the engine on my diesel to shut off, had to stall it in gear). Lots of things to check, do you have a "Bentley" factory manual ( I know they are expensive, but so are shop charges).
check air hose is not broken i had the same problem in the middle of nowhere and lucky me an expert pulled over to help. it was the air hose from the top of the carb to the air filter had a large crack. give it a look. i hope its that simple for you.
Doesn't have one it does have a mass airflow senser and it's in the air intake hose on top of the air filter box. If the hose to the throttle body leaks in any kind of way ( attached hoses off or leaking cracked hose your gat Map codes the the airflow senser isn't getting full flow and theirs a problem that needs corrected check everything before changing the senser though as it's expensive and the senser is'nt returnable if your wrong.
This is just blow by from the crankcase breather system..the trapped oil in the box should be drawn back into the fuel air mixture to be reburned..its a smog pollution control design thingy..there is probably a hose attached to the bottom section of the air box...follow that hose to make sure that it didn't fall off from the top of the valve cover area..i think thats were it hooks up..at least thats where it is on my 87 cbr...i occasionally see a little oil in the box but nothing to worry about. if the hose is off its probably leaking down onto the exhuast pipes and thats the smoke you see. please let me know im curious. thanks
any cracked belt should be replaced. the timing belt drives the cam shaft while the serpentine drives the power steering pump, alternator, water pump, air conditioner compressor, etc. if it breaks in the middle of nowhere, car will get hot real fast and become very hard to steer as you try and find somewhere to pull over. it will also be in the night and adverse weather. so replace it now when it is convenient.
Hello! A device known as the mass air flow sensor is causing the problem on your S-10. It becomes oxidized an dirty. It regulates, in part, fuel flow. Follow the hose that exits the air filter box. The Map sensor is between that point and the hose that enters the intake. It is a black plastic device that has a hose in and hose out. It also has a wired connector on it's side. Check both in/out hoses for any holes or breaks; Replace those hoses if defective. The sensor can be purchased at most auto part stores for around $100; Handle the new sensor with care it is easily damaged. Also a good time to replace the air filter.
Hello! Rough idle and perhaps poor acceleration are, for the most part, caused by a defective MAP (mass air flow sensor). This device, in part, is responsible for fuel flow regulation. This component fails when screen becomes fouled. To locate this device follow the exit hose out of the air cleaner box. The MAP sensor is connected between filter exit hose and throttle body hose. It is a black tube with a screen element inside and has a plug connected to it's side.
The average cost at a auto parts store is $85+$45 (core charge); The core charge is refunded when you bring back the defective part.
It is possible, at times, to clean the screen. However you'll need to purchase the proper cleaner. Radio Shack has a product called "Deox it; catalog # 64-4338. This product sells for around $15 (included is a gold contact cleaner). It is designed to clean electrical parts without leaving a residue.
Disconnect both hose clamps, and plug; carefully remove the sensor, clean and replace. Also , at this time, change the air filter, check hoses for any splits, holes or cracks. If this does not work purchase a new MAP and install.
Where do you see the air? If ther is air in the fuel, look on the suction side of the fuel pump all the way back to the fuel tank. Check every connection for tighhtness. If the hoses are old and cracked, replace them and the clamps.
Also for fun tighten the fuel pump lift screws if it is a mechanical pump.