Question about 1999 Volkswagen Jetta
I have an 2.0 99.5 AEG Jetta. My car started running rough after my I replaced my A/C pump due to a back clutch and bearings, they caused the belt to go. After that the car started idling rough and when the accelerator was presses the rpms would drop and the sounded like it was choking. Then it would clear up and be fine after about 5 min. or less. Finally took it to a shop to have the codes read and got 17536 (Bank 1 To Lean) 16684 (Random miss fire) and then miss fires for cylinder 1, 3 and 4. After leaving the shop on the way to pick up parts the car would not accelerate and was bogging down, would not clear up like before. Check engine light came back on so I rented a code reader and got all different codes. This time they where P1237-1240 (fuel Injector open Cir. in all 4) What I have done so far is replaced spark plugs wires and coil. and fuel filter and pressure regulator. I tested resistance in injectors 1 and 4 and they where normal, tested engine speed censor's resistance and that was normal, and tested the MAF circuit's output at 5v and the repaire manual said it should be about 12v.
Had the sending unit replaced this winter, had kind of the same problems. An O2 sensor code about too big of a difference between the two was also read at that time but did not follow up with it, so nothing was done about it.
Sorry it's a lot to digest but any help would be appreciated. I am out of options besides sending it to a shop and paying them the fumble with it for hours.
That sounds like a MAF (Mass Air Flow) sensor problem to me, are all of the hose clamps tight in the air induction system, especially between the throttle body and the MAF, and that there are no air or vacuum leaks between the throttle body and the MAF?
There is nothing from the air cleaner side of the MAF blocking the flow of air to the MAF?
Posted on May 10, 2010
CHECK FUEL PRESSURE IT SHOULD BE 44 TO 52 PSI.ALSO HAVE THE TIMING AND IDLE SPEED CHECKED AND ADJUSTED.
Posted on May 10, 2010
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Posted on Jan 02, 2017
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