3.0 V6 Starting Problem - Alfa Romeo Forum
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(Post Link) post #1 of 9 Old 01-10-09 Thread Starter
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3.0 V6 Starting Problem

My car has a weird problem.

It's a 2003 CF3 3.0 V6, and last night when I wanted to go home the car wouldn't start. The starter motor works, the engine turns over, but there is no start. It just turns over. And over. It did the same the other night, but after a few turns it kicked into life. It also did it over the weekend while I was at family. Car didn't want to start. Left it there overnight and returned midday the following day and it started with the first turn of the key.

Now I have been scratching my head, but eliminated some of the common problems like the Code Immobilizer. The Code sign goes out after a few seconds with the key in. The car runs perfectly fine once it is started. Nothing different. I have a new MAF, so that is also ruled out as the culprit.

Only thing I can think of is that their is a blockage in the fuel system somewhere. I ran out of fuel a while back (while foolishly driving past various stations) and think that some of the inherently dirty bits in the fuel system is stuck in the fuel filter. What do you guys think?

I haven't checked the spark plugs, but seeing that the car runs perfectly fine normally, I doubt it can be it. The crank sensor may also be at fault, but it hasn't died on the move at all.

It did start raining here in SA a week or so ago, so it may be some electric problem too? But what? Oh, and I have a UniChipQ fitted, but it shouldn't interfere with start-ups should it? Only on throttle positions.

Help will be appreciated. Strange that it only seems to happen at night, after quite a long drive (heat).

2008 Honda FR-V 1.8i Manual
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Possibly crank sensor IMO.
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Quote:
Originally Posted by symon View Post
Possibly crank sensor IMO.
+ 1 if it only happens when hot.
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Sometimes they also cause problems with cold starting, as I found out with my 145.

The V6's ones don't seem to fail as much as TS ones though.
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(Post Link) post #5 of 9 Old 01-10-09 Thread Starter
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See, I drive during the day. Around 200km or so, and when I park and leave it outside for about 3-4 hours and come out when it's dark it doesn't start. Next morning, after the sun has warmed it up a bit it starts first time. I am also thinking crank sensor, but I also think the fuel system is at fault.

Can you tell me where the crank sensor is located?
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The crank sensor is located on the rear of the sump at the gearbox end.

If the sensor fails the injectors (or plugs) will not fire hence no fuel.
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I'd be tempted to say the crank sensor, they don't always fail in the same way, they don't always give the same symptoms.
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Cool, thanks guys. I'll take it to Glenwood Motors next week (Dawie is on holiday), and see what I can sort out.

It's quite irritating!

BTW, is there anything I can do to encourage it to start once it doesn't want to start?! LOL Cause I will be driving a bit tomorrow and over the weekend!
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Quote:
Originally Posted by alfaquad View Post
BTW, is there anything I can do to encourage it to start once it doesn't want to start?! LOL Cause I will be driving a bit tomorrow and over the weekend!
Not really, although you might find that it will not start one minute then be ok 5 mins later.

The one on my 145 failed in a multi storey carpark in oxford. After 1/2 hour trying to start it it suddenly started.

I was just thankful I had a good battery.
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