V5 intermittent starting problem

[Thev5]

Hi all.

I have a Toledo V5 150 (1999). For the last 3 or 4 months, it has had an intermittent starting problem. It has happen 5 or 6 times up until last week, where it has happen almost every other day. The electrical fault light comes on when it does this. Strange thing is, leave the car, come back 30 min’s later and it starts up with no problems! However, the other day, when parked up but with the engine on, it cut out and wouldn’t start again. 45 min’s later, hey presto, it starts!

Does anybody have an idea what this maybe? My girlfriend who drives the car more than myself is getting rather annoyed by it all !!!

Many thanks.

 

[Slimy]

http://www.seatcupra.net/forums/showthread.php?t=314762

The other possibility is the temperature sensor, if the car doesn't know when it's hot or cold it might be putting the wrong amount of fuel in.

 

[Thev5]

Thanks for the reply. I have taken pipes off leading to the TB and have given it a good clean as it was caked in scruge. Also, put some electrical contact cleaner on some of the points. I guess, we will have to wait and see if it happens again.

Whilst doing this, I did find a coolant leak and an oil leak! A union joint going into the bulkhead has a slight leak. Ordering that today. The oil leak is in the filler cap, the rubber seal has perished. All fixable for under £10 :-D

 

[Thev5]

After irritate call from girlfriend. Found that cleaning the TB is not the solution! Only took 20 min's to start this time.
I have noticed a pattern to it. It seems to start fine from cold, you can drive it, park up, come back to it and then it won't start. Does that sound like a temp sensor? And if so, where abouts is it located and rough ideas of cost?

Thanks.

 

[dazzler]

my old v5 started as above then driving home just died been sat outside since, many garage trips,temp sensor, lambda sensor x2, water pump,fuel relay all done no change.aa who towed it back spent over two and a half hours trying to work it out.his best guess electrical problem/ecu faulty.spent too much trying to sort it out went out bought another v5.if you find out problem please post as 51 plate v5 sat outside turns over just will not fire up,dont really wont to sell as scrap

 

[Dox1966]

Crank sensor fault would give no spark or fuel injected - they often fail when hot

 

[Slimy]

Have you actually looked at what fault code is being reported? It should still be in there even if the light goes out.

 

[Thev5]

Haven't seen what the fault code is. I have no vagcom, so will need to take it to a garage for that. Interesting point about the crank sensor. When I was looking for ideas on the net, three or four other people had similar problems and came back with faulty crank sensor.

 

[Slimy]

I'd recommend you save the garage price for a code check and buy yourself the appropriate kit. Even if you buy yourself one of the handheld units just to look at codes, it's likely to be the same price as a one off check from a garage.

If it was the crank sensor (or any other sensor) it would likely show up as a fault code then you'll know for definite that's what needs changing.

 

[Thev5]

I ordered one yesterday. Hopefully arrive before the weekend, so should have an idea of what it is. I will keep you posted.

 

[RoddersV5]

How old is the battery..? This may have an effect of the starting. Check the output when cranking..

 

[Thev5]

New battery fitted about 5 or 6 months ago and output is fine.

 

[dazzler]

as ive said above mine started exactly the same way,all i got from vagcom was short to ground faults then when it died it was showing the following codes
p0141
p0261
p0264
p0267
p0270
p0273
p0418
p0445
i dont think any other sensor was checked because the codes didnt come up.i hope yours is not suffering from the same thing

 

[Thev5]

Right, the crank sensor was the problem. Now I have a new problem! I've got the sensor, but fitting it is proving to be a pain. I have undone the bottom part, but the wiring and plug go up underneath the inlet manifold. I can't see the plug or work out how to get at it. I asked the garage and they want almost £300 to do the job! Am I missing a trick here or is a front of car off job?

 

[Dox1966]

Right, the crank sensor was the problem. Now I have a new problem! I've got the sensor, but fitting it is proving to be a pain. I have undone the bottom part, but the wiring and plug go up underneath the inlet manifold. I can't see the plug or work out how to get at it. I asked the garage and they want almost £300 to do the job! Am I missing a trick here or is a front of car off job?

How do you know the crank sensor was the problem if its not fitted yet?

 

[Slimy]

A quick Google search suggests it is in fact under the inlet manifold, and a nightmare to get to. I don't think the front of the car off will give you any better access though? Unless the removal of the front is shortly followed by removal of the manifold?

 

[Dox1966]

From memory its above the oil filter assy and beneath the inlet manifold, maybe removing the oil filter assy is the way to go to access the plug?

 

[Dox1966]

From memory its above the oil filter assy and beneath the inlet manifold, maybe removing the oil filter assy is the way to go to access the plug?

AQN 20v the plug is attached to the dipstick tube, I don't think the earlier AGZ engine is the same.

 

[Slimy]

Pic from Elsa;

Not exactly the best pic, but I think the view is from the front of the car, as you would look through the bumper. The fact that it's sitting on top of a wiring loom probably makes it that much more awkward. The process only includes removing the undertray, so the manual seems to think it can be reached from underneath.

 

[Dox1966]

Pic from Elsa;

Not exactly the best pic, but I think the view is from the front of the car, as you would look through the bumper. The fact that it's sitting on top of a wiring loom probably makes it that much more awkward. The process only includes removing the undertray, so the manual seems to think it can be reached from underneath.

It looks to be directly above the coolant heat exchanger