1996 Audi A4 engine turns does not start

Tiny
RPEREZ
  • MEMBER
  • 1996 AUDI A4
  • 6 CYL
  • 4WD
  • MANUAL
  • 17,600 MILES
What is the parts to be replace? This car turns but won't start;there is no spark but fuel pump is working
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Friday, November 6th, 2009 AT 2:10 PM

11 Replies

Tiny
MHPAUTOS
  • EXPERT
Hi there,

Thank you for the donation,

As there are a number of components that can cause loss of ignition we first must run a diagnostic test to try and determine the exact cause as just bolting on new parts can be costly waste of time, so the first thing that should be done is to have a diagnostic scan done as this will identify any unresolved fault codes that can indicate a failed engine management component, I would be looking for a fault with the crank angle sensor or the cam angle sensor as these can both be the reference signal for the ignition system, next I would be testing the coil, I can give you the test procedure for the crank, cam sensors and the coil, but you will need some test equipment and an understanding of automotive electrics, if in any doubt your service center can assist you here.
Let me know which way you wish to proceed, but the important thing is get a scan done first.

Mark (mhpautos)
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Friday, November 6th, 2009 AT 6:36 PM
Tiny
RPEREZ
  • MEMBER
Hi there Mark,

I agree that it needs the diagnostic scan. I don't have a scan tool at the moment but I will get one. I have the Ohmeter & test light which I migth need later. Can you recomend a good scan tool that is modestly priced?

Thanks,
Rick
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Friday, November 6th, 2009 AT 7:17 PM
Tiny
MHPAUTOS
  • EXPERT
HI there,

As I am Australia, I am not sure what you have available to you there, but as here, you will have to make sure that what ever scanner you get is compatible with your European car, many generic scanners will only do basic tests, manufactures are making it harder and harder to access this information as they want to keep the repairs in house, so as a result we in the trade muse invest considerable $$$ on top range scanners and these won't always work, my work shop scanner is work in the order of $15K with all the interfaces, but there are still cars I can read, it so frustratiog, so basically do some home work of just pay a dealer to do the scan and get a report print out of codes and system faults.

Mark (mhpautos)
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Friday, November 6th, 2009 AT 7:40 PM
Tiny
RPEREZ
  • MEMBER
Hi Mark,

I initially tested the primary ignition and that has 12 volts.I don't know how to test the coil. Can you help me with that?

Thanks,
Rick
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Monday, November 9th, 2009 AT 6:53 PM
Tiny
MHPAUTOS
  • EXPERT
Hi, I will send something when I get on Mitchell this evening.

Mark
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Monday, November 9th, 2009 AT 9:05 PM
Tiny
MHPAUTOS
  • EXPERT
Testing coil.
see text & pics for coil test.


http://www.2carpros.com/forum/automotive_pictures/61395_1_75.jpg



http://www.2carpros.com/forum/automotive_pictures/61395_2_16.jpg



http://www.2carpros.com/forum/automotive_pictures/61395_3_7.jpg


http://www.2carpros.com/forum/automotive_pictures/61395_coil_1.jpg



Did you get a scan done?

mark
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Tuesday, November 10th, 2009 AT 2:23 AM
Tiny
RICCAREPAIR
  • MEMBER
Hi Mark,

I have not done a diognostic scan yet because the scan tool I ordered dit not arrive. After the scan I will Email you of the result.

Thanks,
Rick
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Thursday, November 12th, 2009 AT 6:31 PM
Tiny
MHPAUTOS
  • EXPERT
Hi Rick,

That will be good, hope you get some results soon.

Mark
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Thursday, November 12th, 2009 AT 8:41 PM
Tiny
RICCAREPAIR
  • MEMBER
Hi Mark,

The diagnostic scan did point that the injector open loop and some oxegen sensor.I manually test the injector and no trigger. It has the 12 volt on the one wire and the other wire has none so that wire I connect to a test light and the positive battery. Cranking the engine did not blink the test light. Also the cam sensor has no cliking sound.
How do I determine that the cam sensor is defective for sure?
Please let me know.
Thanks,
Rick
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+1
Tuesday, November 17th, 2009 AT 6:42 PM
Tiny
MHPAUTOS
  • EXPERT
Hi Rick,

The cam sensor will be a magnetic sensor, it is the movement of the cam gear teeth(am thinking its the same with Audi) that alters the magnetic field or the sensor inducing a pulse signal to the ecu, this is normally tested with an engine oscilloscope, but if the magnet is very weak it wont pulse correctly, ok I know your next question, how strong should it be? Well it wont snap onto a metal surface, but there should be some resistance felt when something metallic is offered up. Can you post the P code you got Pxxxx should be 4 digits.

Mark (mhpautos)
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Tuesday, November 17th, 2009 AT 10:13 PM
Tiny
RICCAREPAIR
  • MEMBER
Hi Mark,

This is a little complicated than I thought. My ojective is to get that pulse back. Also the open loop in the fuel injector is a problem. The negative terminal of the battery has a 12 volt, I mean there could be a short. When I connect a test light between the cable to the neg-terminaal post, the light iluminate. How do I segragate this situation?The cam sensor seems to be fine when I took it out and inspect it manually. The coil has infinite resistance and there is no 9000 to 10500 OHMS. Does this mean the coil is okay? Sorry that I"m coming from different angles.
Can you help me clear some of my concerns.I will work again in this car soon and I'm still expecting a positive outcome.

Thanks,
Rick
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Saturday, November 28th, 2009 AT 9:38 AM

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