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Old 05-03-2010, 03:36 PM   #1 (permalink)
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Default Audi 2.8 STARTING ISSUES

I have an Audi 1999 2.8L .It has 107000 miles on it.
2 months ago I was driving and the car died on me.However, the car started immediately after turning on my ignition. Now, the situation has gotten worse. These days it won't start at all. Sometime it would start after so many attempts. I have had two different shops look at it. They both have diagnosed different fault. The first shop says it's the electrical part of my ignition switch. They say i need to change it and have the audi dealership reprogram the switch. The second shops says my ECM is bad. They also want me to change it and have the Audi dealership program the new ECM with my vin number. The guy in the first shop has worked with an audi dealership for several years.

Please guys I need your help. I am trying to avoid a visit to the audi dealership. The last time I went there they took all my money but couldnt solve my electrical issues (my power lock and power windows just stopped working all at the same time)

Fault codes from shop 1: P1625 P1749 P1432 P1545
Fault codes from shop 2: 16988 17967 18010 18032

Thank you so much for your time.
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Old 05-05-2010, 03:59 PM   #2 (permalink)
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P1625 - Data-Bus Powertrain Unplausible Message from Transm.Contr.

P1749 - Transm.Contr.Unit Incorrect Coded

P1432 - Sec.Air Inj.Valve Open

P1545 - Throttle Pos.Contr Malfunction

16988 - Internal Contr.Module Random Access Memory (RAM) Error

17967 - Idle Speed Contr.Throttle Pos. Adaptation Malfunction

18010 - Power Supply (B+) Terminal 30 Low Voltage

18032 - MIL Request Sign.active

^^ For future reference

Last edited by Pete@ecstuning; 05-05-2010 at 04:03 PM.
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Old 05-05-2010, 04:04 PM   #3 (permalink)
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You drive an automatic? How does it idle?

So we have an issue with the transmission computer, SAI pump and throttle body. Did each mechanic clear the codes? Because I suspect they did not properly scan as there should be overlap in what each mechanic scanned for.
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Old 05-06-2010, 03:49 PM   #4 (permalink)
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Yes its an automatic..and it idles like any other Audi.

How does one clear codes...maybe i can do it myself and run another diagnostics.

Thanks chris!
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Old 05-06-2010, 03:50 PM   #5 (permalink)
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You will need a diagnostic tool like VAGCOM. If you don't have one we have USB scan cables that you can use in conjunction with the demo version of VAGCOM. Most OBDII readers can clear your codes but you really should use a cable and the demo VAGCOM software available at RossTech's website.
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Old 06-14-2010, 11:05 PM   #6 (permalink)
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This issue seems familiar to mine; I am just a layperson, not a mechanic and i am wondering if my situation is similar. Here is my situation: My brother and i wanted to replace the a/c compressor thinking that it might be the culprit for the lackluster a/c issue. Well before we even try to unplug and or change anything, my '98 Audi A4 was running perfect. So after tinkering with the a/c compressor but not taking anything out except for my brother unplugging something that connects the compressor to another part of the engine; changing the oil; checking the fuses to see if any of them malfunction; all of this was done after my brother disconnected the battery. So essentially after all of this, the car was able to start except that it couldn't run pass a certain RPM and not as it used to before we did all the above and a code P1545 came up. And so the day after that, we couldn't start the car anymore; and it seems like there is some smoke coming out when we try to start the engine. Anybody out there who is nice, knowledgeable and is not fazed by my long story, please assist me in any way, shape or form. Thanks and i hope this is not the beginning of an expensive repair for me.
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Old 06-15-2010, 10:48 AM   #7 (permalink)
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Check your belts and your belt tensioners. Even if you were tinkering around that area you may need to re-assess your belt situation. You could have knocked something loose, etc.

For those who want a scan tool - Click here for a scan tool for your 1996 - 2001 Audi A4. You can combine the USB scan cable diagnostic tools with the demo version of vagcom's software for dumb devices OR you could pick up a V-checker scan and diagnostic tool all in one unit.
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Old 06-15-2010, 03:37 PM   #8 (permalink)
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Hi,

Thank you for replying and giving me the heads up. Now, the belt and tensioner that you are talking about, how would i know it is loose? And can that be the cause of the smoke and the fault code P1545? Again, any help is greatly appreciated.
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Old 06-16-2010, 08:42 AM   #9 (permalink)
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Quote:
Originally Posted by that_one_guy View Post
Hi,

Thank you for replying and giving me the heads up. Now, the belt and tensioner that you are talking about, how would i know it is loose? And can that be the cause of the smoke and the fault code P1545? Again, any help is greatly appreciated.
The smoke, perhaps. Did it smell like burning rubber?

P1545 is throttle position control malfunction. Since you have a 1999 car your have a drive by cable car. If you are getting this error your may need a new throttle position sensor - which is not hard to replace. Try doing a throttle body adaptation with your vagcom setup first. If that isn't successful you may need a new throttle position sensor.
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Old 06-16-2010, 09:55 AM   #10 (permalink)
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If you shoot me your VIN I can see about snagging you a TPS.

Last edited by Pete@ecstuning; 06-16-2010 at 10:16 AM.
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