I have a 03 audi a4 1.8t & lately it feels like it was miss-firing or theres a delay when i start the car. I thought it was nothing for it was really cold here for the ;last couple of weeks. Then 3 wks of having that on/off issue my MIL sensor went on...i need some help on how to fix this
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Re: MIL sensor was on
First thing to do is to go to AutoZone or Advance Auto Parts and have them do a code scan on the computer. It'll pull up the failure codes that are stored in your car's computer. Once you have the codes, post them here as a reply and I can define them for you. The stores will give you the proper codes, but I've seen in the past that their code definitions aren't always accurate. Get your codes, post them here, and I'll help you figure out the issue.
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Check Fuel Pressure -- at the schrader valve on engine fuel rail -- with a gauge 38 to 42 lbs approx
Listen by the fuel tank-- for the pump to come on,have someone cycle the key on & off
Checking Spark will be a challenge if you have individual coils Checking the Crank Sensor also an issue checking
Do not throw parts at it
Check for codes if you have a MIL Lamp lite on dash
Acting up lately & possibly missing ,troubles me, because that is unacceptable with my vehicles. I don't go an hour & I get a start on those type issues, unless it is raining or lots of snow coming down
I don't see the no start connected to other issues, unless you have an ignition module vs: cop coils & it is dead
Replaced the MAF sensor - nothing. Took it to a authorized toyota shop & checked compression which check out good and put the computer on. Computer read mis-fire on cylinder 1, and then multiple misfire (like it would jump around). We went ahead and replaced the fuel injector on cylnder 1 - did not solve problem as when we hook the computer up, misfire seemed tp stay at idle and seem better when running high RMP, but check engine light is on as it never went away. Went ahead and replaced the coil pack to cylinder 1 - nothing. what am i missing?
Do you have the idle speed turned up to keep it from dying? Because it is high. Check engine light on? Have you checked for vacuum leaks at the gasket under the throttle body? How does the car run under acceleration? You might have a worn distributor shaft.