Has anybody else experienced poor starting when the weather is hot?
On a few occasions now, on the first start of the day, the engine misfires really badly and takes some time to come good. The check engine light stays on for a minute for so and then clears. (I don't think that oil or water is seeping into the plug wells overnight.)
When it is really hot (live in South Africa)I sometimes have to try starting the car twice or three times. Don't know why. It does't misfire though.
Maybe it could be al the hot air in the engine compartment?
I've had this problem 3 times so far in the past 5 years of ownership. I'm in Malaysia, a pretty hot country.
After cranking the ignition for the first time of the day, the car comes to life for a short moment, with the injector warning light on, then it would die off. Have to restart another 4 or 5 times with throttle blipped slightly to get the engine running. Wonder what's wrong? No misfiring, though.
Someone i was speaking to suggested a possible cause.
Lots of heat might be enuogh heat to evaporate the small amount of petrol in the injectors. This causes th difficult starting and the injector light to come on as there would be a pressure drop in the system.
Sound almost plausable to me.
1997 'P' 2.0 16v TS
Got the same problem, when the weather is hot. I get in trouble when the car stands in the full sunlight. I have to start over and over again (sometimes about 10 times) before the engine starts running. First it runs terribly and the injector light keeps burning. After about 30 seconds the engine runs OK and injectorlight dims.
I've tried to reset the ECU by cutting off the battery-clip. Didn't help.
-Air temp /water temps sensor giving duff info to ECU ,hence warning light/poor running
I think the way to solve this is to plug a diagnostics system in when the problem happens.Or if this ECU unit stores fault codes like vauxhall's just read off the memory.
Does anyone know how to bring up fault codes ?(i.e without special equipment).
ON Vauxhalls you just 'short' the diagnostics plug and the Engine management light flashes 'X' number of times indicating where the fault is occuring .
My money is on the fuel vapourising. It's happened every day over the last week and every time the car has been standing in full (UK!)sunshine. You would have thought that an Italian car shouldn't be afraid of a little sun! I'm still trying to find a fix though.
Regarding ECU diagnostics, I know that only the correct test gear can access them on the later 16v ECU's, but I have a feeling that the earlier 8v and V6 ECU's can be accessed through the accelerator pedal- don't know any details I'm afraid though.
This sounds a lot like a common problem with 164s. On that car, it's usually caused by a split in the short pipe from the in-tank fuel pump to the coupling on the tank. This allows the fuel pressure to bleed away when the car stands, making starting dificult. Worse in hot weather of course. Only fix is to remove the pump unit and replace the pipe. I can't tell an awful lot from the drawing in the parts CD but it does look as if there are a couple of hoses in there on the 155 as well.
First step at diagnosis might be to try and get hold of a decent fuel pressure gauge so you can do some leak-down tests. It could be either at the pump end or the pressure regulator end. Might even be a leaky injector.
I've just checked and guess what? It's the same pump as a 164. So I'll look in that area first.
Incidentally, on the parts CD the fuel pump for the late wide body 155's is only shown as a complete item (£200!), however if you look under the early models, you will find that all the component parts have their own part number and are available separately - even though it's the same pump.
The Parts CD certainly sounds more invaluable by the day. Does some kind soul fancy burning a copy of the disk off, I would cover the costs involved in doing this.
I this would be possible please E Mail me.
Many thanks in advance
[This message has been edited by G Baker (edited 27 June 2001).]
Some earlier versions of the ECU had a fault when cold starting after the car had been sitting in the sun. This can be corrected by a PROM upgrade but its probably not worth it if the problem goes away after a minute or so. No matter if this is the reason or if its just vapourisation of fuel, either way you know its not terminal http://www.alfa155.com/ubb/smile.gif