Crazy problem....HELP!

**99BlackB5** · 12-13-2008 12:50 PM

Lately my battery has been getting weak so I decided to replace it with a new one. So I drive the car home, replace the battery, charge it up and I start up the car and let it idle. As soon as I go to take it for a drive the car starts spurting and stalls. So now for the life of me I can't see why this is happening yet alone from a battery change so I put the old battery back in and have the same problem. Now I know it isn't the battery because that just makes no sense so I figure it has to be a coincidence. So now it hardly wants to idle at start and after a little while of giving it some gas it will smoothen out and idle like normal but as soon as you give it gas it wants to stall and often does. If you try and hold the gas pedal down it will rev up to wherever but as soon as it hits the RPM you are trying to hold it will immediately drop the revs back down like it is getting no fuel. Only previous related problem I can think of is when you put gas in the car as your pumping it the idle will go all weird and stop as soon as you're done. If you try and shut the car off while it pumps in when you go to start it up it will be a bitch to get it to crank over it will spin the flywheel and seem to not get enough gas and then eventually it will kick over.

**B5 Quattro** · 12-13-2008 01:13 PM

Fule Pump !?!?!
Filter !?!?!

**zrowcool** · 12-13-2008 01:57 PM

throttle body adaptation... leave the key in the on position for 5 mins without cranking or hitting the throttle. then try it again

**99BlackB5** · 12-13-2008 02:03 PM

Hmm interesting. Well it is a drive by cable so I dunno if that still applies but I will try that. My fuel pump is definetly priming but I am thinking I should try to change the fuel filter. I jacked the car up and looked at the location i nthe line by the tank. Does that center bolt just come out of the middle of the housing to drop the filter?

**99BlackB5** · 12-13-2008 02:14 PM

Originally Posted by zrowcool

throttle body adaptation... leave the key in the on position for 5 mins without cranking or hitting the throttle. then try it again

Ok just tried this, didn't change anything.

**zrowcool** · 12-13-2008 02:15 PM

even if it is DBC the throttle position senor has to adjust for the fuel. As for the filter, theres a bolt on the side that holds it in place. then a banjo bolt both on the top and bottom of the filter

**99BlackB5** · 12-13-2008 08:28 PM

Ok well not the TPS....car is getting fuel...any chance it is the MAF?

**Seerlah** · 12-13-2008 10:46 PM

As stated above, you need to do a throttle body adapt when you disconnect the battery. Leave the key in the starting position for a minumum of 5 min (I usually do 10 for good measure) before cranking it. Your battery light would come on if you had a weak battery, but that would not cause the sputtering condition you are talking about. You have a battery meter on your cluster, and with ignition off it should read ~12.5v. With the car running, it should read ~14.5v as it will be running off the alternator. The bad idle could be a couple of things. Bad ignition coil, spark plugs need replacement, MAF, loose hose, bad dv, etc. But I would def try the throttle body adapt again, and if you scan the car with a VAG com you will more than likely have an intermittent code. That should lead you in the correct direction.

**jturnbull** · 12-13-2008 10:54 PM

this happened to me too even after i let it sit with the key in the on position i just did the same thing again and let it site for like 15 minutes the next time and it worked. Just disconnect the battery and let it sit when u reconnect for like 15 minutes