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Old 10-27-2010, 06:57 PM
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Question Help please! 03 jetta wont start!!

Not the battery and not the starter. as i turn key i hear the starter goin at the normal speed. engine just wont go. plenty of gas, oil level is good and fresh. all the fuses are good. any suggestions and simple things to check would be great. but id mainly like a good idea before i bring it to garage so i can act like i know what im doin so i dont get bogus overcharges.
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Old 10-27-2010, 07:14 PM
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You're either not getting spark or you're not getting fuel to the motor. Pull one of the coils off and stick a spark plug in there. Have a friend crank the car while you watch for spark. If it sparks then you know its most likely a fuel delivery issue. Checking fuel delivery is a little more advanced then what I would recommend a novice to try. One thing you can try is taking the throttle body hose off from the throtte body. Have a friend try cranking the car while stepping on the gas. The throttle body should open. Once it does spray a short burst of carb cleaner in there while your friend continues to crank it. If it trys to fire up then you know timing is good and it is surely a fuel delivery problem. You will need to take it into the shop at this point unless you're up for an education and a trip to harbor freight. P.S. don't force the throttle body open by hand unless you want to buy a new one. Also, quickly turn the engine off if it fires up with the carb cleaner. You will trigger a code if you let it run for more then a few second.

Last edited by stagbuilder556; 10-27-2010 at 07:23 PM.
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Old 10-27-2010, 07:18 PM
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When you first open your drivers door do you hear your fuel pump charge the system?
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Old 10-27-2010, 07:28 PM
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i got a feeling the sparks are fine. i had a coil go out on me before and that was one of the first things i tried before it stalled, also before it stalled i could tell that the idle would bog down so im thinking then it would be fuel delivery or i guese another post i was looking at said MAF. i wanna try cleaning the MAF sensor before i dig into the fuel system i just dont know where it would be. thanks a lot
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Old 10-27-2010, 08:54 PM
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on the right side of the engine bay you will see your air box. Thats where your air filter is. Your mass air flow sensor is attached right there. Its the part that has the wiring harness plugged into it. I doubt your problem is that.
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Old 10-28-2010, 05:24 AM
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even if the MAF was bad, the engine would still run, it would run like crap, but would still run unless totally fried. I had one go on me and the mileage dropped and ran bad but still ran. Like Geezir said, think fuel, if it was bogging it's maybe not getting enough if any. check/replace fuel filter, check fuel pressure. get back to basics first...Spark, fuel, compression, then work out from there.
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Old 10-28-2010, 10:43 PM
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Could be a relay, like* Geezir asked though, do you hear the fuel pump start up when you open the door?

Last edited by Deadlanddub; 10-28-2010 at 11:11 PM.
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Old 11-04-2010, 09:38 PM
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i put in a new fuel filter and didnt help... i get no noise from under the seat where the fuel pump is... i even took off the black circular plate under the back seat and got right up to it to listen... thanx everyone ima try getting a new fuell pump for it thtis weekend... any suggestions
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Old 11-05-2010, 09:25 AM
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Quote:
Originally Posted by montresor2 View Post
i put in a new fuel filter and didnt help... i get no noise from under the seat where the fuel pump is... i even took off the black circular plate under the back seat and got right up to it to listen... thanx everyone ima try getting a new fuell pump for it thtis weekend... any suggestions
Fuel pump relay has a bad rep I've read - check the fuse associated with the pump too - Fuse 28 (15 Amp) in the console fusebox and Fuse S163 (50Amp) on the fuse bracket thing above the battery. Check them with a multimeter then try reseating the fuses , might want to unhook the battery -ve first. Contacts on those fuses above the battery sometimes get corroded.
You can check the voltage at the pump too - I think when it's not running there's still like 3 volts there or something weird. Should have close to battery voltage when it's running. It pulls quite a heavy current I think in the area of 8 Amps when running.
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Old 11-18-2010, 09:30 PM
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im stumped. i do know that the fuel pump relay is good tho put it in another jetta and it worked fine. the fuel pump wasnt running tho so i had a guy check it out. he got it the pump running with a jump line but car still wouldnt start. hes got figured its something wrong with the engine control module, he said it has to go to the dealership for something like that for coding and such. he figures that this control module is causing other components to fail. i do believe him and am out of ideas so im bringing it to dealship anyways but does this make sense to anyone else? maybe someone can help me understand this a lil more... does anyone know what repair on an engine control module would COST???
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Old 11-18-2010, 10:59 PM
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When cranking the motor, does the engine light stay on? Have you scanned it for codes? what about the Key fob program? I'm not sure but will the car still crank if you lost the key program?
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Old 11-19-2010, 09:14 AM
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The ecm is probably a small fortune at the dealership and might not even be the problem.
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Old 12-30-2010, 10:41 AM
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I had a problem like this about 3 months ago, it ended up being the ignition switch which is located at the end of the key cylinder. All you have to do it take off a few screws from under the steering wheel column to access the part. It was about 40 bucks from Advance Auto here in Ohio. One sign it is going bad is that the check engine light will not turn on at all when trying to crank, the lights on the dash will stop working, different features in your car might stop working also, my power windows stopped. Lets hope it isn't the fuel pump because those are $$$$$.
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