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A6 Intermittent Starting Problem
Dear All
Some time ago I posted about my A6 2.4 Auto that has an intermittent starting problem (details below). Since then, my garage (an independent Audi specialist) has checked over all of the obvious things (spark plus, cleaned the injectors etc), however the problem persists and next week the car is booked in with them to have the fuel pump replaced - purely on a speculative basis. However, I have been in contact with another A6 owner whose car had a similar problem, and his was diagnosed as a faulty immobilizer. I'm now wondering if replacing the fuel pump is the right thing to do at this stage. The biggest difficulty is that the problem is almost impossible for the garage to reproduce (happens about once a week), so it's very difficult for them to know where to start. From my notes below, can anyone suggest any components that are definite candidates for replacement or any that can almost certainly ruled out as the culprit? =B7 A typical scenario is that the car starts fine in the morning, and I park at work after a 20 minute drive. Come to start the car in the afternoon - nothing. The engine cranks over fine, but doesn't fire up. I can normally get it started using full throttle and cranking over for periods of 30 seconds or so. Sometimes the engine will fire after just a couple of cranking periods, but on one particularly grim occasion it took 10 minutes. =B7 Another scenario is that I drive somewhere (short or long distance) stop for a few minutes and then try and restart and it won't. =B7 When the engine finally starts after a problem start incident, it doesn't roar in to life straight away. Rather, I can sense it firing but know that if I stop cranking it will die, and have to pump the accelerator to coax it in to life. =B7 Once started, the engine runs perfectly. No sign of any trouble at all. =B7 There are NO fault codes being logged. =B7 The dashboard immobilizer light does NOT remain lit when the car is having a problem starting. =B7 The most annoying thing is that the problem is very intermittent (say once a week on average) and most of the time the engine starts fine. I started to keep a log of when it happens but there doesn't seem to be any obvious pattern. Thanks very much folks! Cheers - Graham |
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#2
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Hi Graham,
What year is your A6? A no start scenario could be the hall sender but that would thro a 2113 code. If it's the immobiliser, check for a faulty relay. I have a C4 S6 and relay may be behind panel under steering column. Tony > wrote in message ups.com... Dear All Some time ago I posted about my A6 2.4 Auto that has an intermittent starting problem (details below). Since then, my garage (an independent Audi specialist) has checked over all of the obvious things (spark plus, cleaned the injectors etc), however the problem persists and next week the car is booked in with them to have the fuel pump replaced - purely on a speculative basis. However, I have been in contact with another A6 owner whose car had a similar problem, and his was diagnosed as a faulty immobilizer. I'm now wondering if replacing the fuel pump is the right thing to do at this stage. The biggest difficulty is that the problem is almost impossible for the garage to reproduce (happens about once a week), so it's very difficult for them to know where to start. From my notes below, can anyone suggest any components that are definite candidates for replacement or any that can almost certainly ruled out as the culprit? · A typical scenario is that the car starts fine in the morning, and I park at work after a 20 minute drive. Come to start the car in the afternoon - nothing. The engine cranks over fine, but doesn't fire up. I can normally get it started using full throttle and cranking over for periods of 30 seconds or so. Sometimes the engine will fire after just a couple of cranking periods, but on one particularly grim occasion it took 10 minutes. · Another scenario is that I drive somewhere (short or long distance) stop for a few minutes and then try and restart and it won't. · When the engine finally starts after a problem start incident, it doesn't roar in to life straight away. Rather, I can sense it firing but know that if I stop cranking it will die, and have to pump the accelerator to coax it in to life. · Once started, the engine runs perfectly. No sign of any trouble at all. · There are NO fault codes being logged. · The dashboard immobilizer light does NOT remain lit when the car is having a problem starting. · The most annoying thing is that the problem is very intermittent (say once a week on average) and most of the time the engine starts fine. I started to keep a log of when it happens but there doesn't seem to be any obvious pattern. Thanks very much folks! Cheers - Graham |
#3
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Thanks for your replies! My A6 is a 1998, and there are no fault codes
being logged. I've just heard back from the A6 owner who had a similar starting problem that turned out to be the immobiliser, and his car didn't log any fault codes nor did the dashboard immobiliser light stay illuminated. So immobiliser is still in the frame - or the relay (thanks Tony). BBO, if the fuel pump is the culprit, is it plausible that there would only be a problem at startup? I'd have thought that the car might suffer from other problems - poor running perhaps? Cheers - Graham |
#4
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In case anyone else has a similar problem, the faulty component was the
coolant temperature sender. |
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