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> High engine rpm when cold and revs hanging when shifting gear, revs hanging
pyle
post 21st March 2016 20:15
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Hi everybody, I'm Rossen from Bulgaria. I have a 1995 Alfa 146 ti and the problem I've been having for the last year or so is very high engine rpm when cold started after 1 night. When the engine starts the engine revs to 2000rpm and the goes down to 1400rpm and stays there for around 30sec and the again goes down to 1100. Before the engine goes up to about 60C the revs go down very slowly while shifting gears, and once I get the engine past 3000rpm the revs drop normally. I have no running issues, engine runs good has power and everything, slight rev hesitation under load but not too bad.
Please help its annoying. Sorry for the mistakes.
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GialloEvo94
post 22nd March 2016 00:32
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To try and avoid any guesswork, the first thing I would advise you to do is to get your ECU scanned for any fault codes. You can either get a garage to do this for you who has a diagnostic machine that is compatible with your engine ECU or you can DIY diagnostics using a laptop, some software and cables.

Multiecuscan is the most widely used DIY software for doing this although on the earlier cars that use the Bosch Motronic M2.10.3 / M2.10.4 ECU like yours will have, you will need to pay for a license to use the software. For a free solution I would try DnEcuDiag which was formerly AlfaDiag. You will still need the cables if you don't already have some. Information can be found in the following thread...

http://forum.alfa145.com/index.php?showtopic=18638


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pyle
post 2nd April 2016 19:32
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I did an ECU scan today, no recorded error, just a slightly sluggish lambda sensor and probably non working lambda heating, and that's about it. Maf is fine, spark advance is low engine, warms up good, I dont know what the FRA and TRA should be..
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pyle
post 4th April 2016 17:19
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Another thing I noticed when doing the ecu scan. I got a bit of live data which showed that the engine heats up to 102c before the fan kicks in. A friend of mine told it's normal because the diagnostic software reads the senson in the cylinder head and that is the temp of the engine its self. Is that right?
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pyle
post 6th May 2016 16:51
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Hi, so as not to start another thread..

I'm have idle problems on a cold engine until about 80C, when I depress the clutch on say a traffic light the revs drop to 600 and back to normal. When the gauge reaches 80C its all fine but if I start the engine hot 80C + the idle is also bad and it nosedives sometimes. plugs are new, lambda is fine, maf too, ICV I suppose it works because on a hot engine the revs are fine. The car runs superb, pulls strong all the way to the limiter, mileage is good, 26-8 depending on traffic.

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pyle
post 13th May 2016 06:49
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I'm having a sneaky suspicion its the temperature sensor on the thermostat...
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FactoryOsaruJPN
post 15th May 2016 01:57
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Have you had the idle control valve replaced or cleaned?
I think it might cause this annoying behaviou.


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I have driven 145 for more than 17 years in Hokkaido the most northern/coldest district of Japan.
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pyle
post 15th May 2016 06:40
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QUOTE(FactoryOsaruJPN @ 15th May 2016 01:57) *
Have you had the idle control valve replaced or cleaned?
I think it might cause this annoying behaviou.


Yes it made things better when the engine reaches 80C.
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Ganz
post 21st May 2016 00:25
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QUOTE(pyle @ 4th April 2016 18:19) *
Another thing I noticed when doing the ecu scan. I got a bit of live data which showed that the engine heats up to 102c before the fan kicks in. A friend of mine told it's normal because the diagnostic software reads the senson in the cylinder head and that is the temp of the engine its self. Is that right?


Engine oil temps can get much hotter than 102c. This must be your water temp. I would scan the ECU several times over the course of a few days and see if the readings are consistent.


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pyle
post 21st May 2016 12:11
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QUOTE(Ganz @ 21st May 2016 00:25) *
Engine oil temps can get much hotter than 102c. This must be your water temp. I would scan the ECU several times over the course of a few days and see if the readings are consistent.


It is consistent I will change the fan resistor on the fan its self next week.
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billyleung_146
post 30th June 2016 11:39
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Hello,

I have exactly the same problem. how is your car going?
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pyle
post 23rd July 2016 10:17
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QUOTE(billyleung_146 @ 30th June 2016 11:39) *
Hello,

I have exactly the same problem. how is your car going?


Its still doing it but its fine as it warms up past 50C. I remember a year ago I tried a fuel additive and then a 3-4 hours doing 100mph and it was gone for a bit and it started doing it again shortly after and here we are a year after. I think it might be the thermal switch on the stat so that's my next stop..

This post has been edited by pyle: 23rd July 2016 10:18
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Schrodingers_Cat
post 26th July 2016 10:23
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I had the same problem on mine, it was the Lambda sensor.
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pyle
post 28th July 2016 14:12
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Could be.. I bought a used "working" one which probably has a faulty heater because its all well after it warms up.. Thanks for the update.
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pyle
post 16th September 2016 11:01
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So as not to open a new thread I would like to ask. What could be the reason for my car trying to stall on the first start of the day. It fires up at around 1300rpm, brings them down to 850 and the back up to 1200-300 and blipping the throttle doesn't do anything but is sounds like it has too much air being sucked. Could it be fuel related? I used to do it every now and the but now it's constant. I've also noticed it fires superbly at around 75-80C.
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