- Joined
- Oct 1, 2004
- Messages
- 63
- Points
- 21
Hello!
It' s not the first time that I write on this forum for a problem on my Uno, this is a problem of a bad idling of engine (is a 1.1 with lambda and mono jetronic fuel injection). I did never solved the problem and some months ago i stopped to write on forum because my grandfather crashed the car (Not a big crash fortunately). But car was repaired for crash problems (anterior light and other stuff) and I'm trying to solve idle problems another time.
The problem appears some minutes after engine start (when it starts to warm up and idle rpm is decremented by ecu as soon as temperature rises up). I tried to check basilar stuff (sparks, air leaks, vacuum advance, lambda sensor, air temp and water temp sensors and similar) without finding any fault and without success in solving problem. Idle is bad and bad as soon as external temperature is low. THen it is better when engine is completely hot.
However it sounds as a poor mixture problem (engine looses rpm at idle and it cuts out or looses power if i rapidly push gas). Sometimes it cuts out also soon after I start it: rpm is at approx 1300 (it is incremented by ecu when cold) then it dies. It remembers me old carburettor engines: they died if started without mixture enricher when cold).
So I tried all that came in my mind...
After a lot of time and after trying to change sensors, sparks, testing etc... i tried to change timing on cambelt (!) (because i had a suspect that the machanich who changed timing belt could regulated it in retard). SO I advanced cambelt position respect to timing belt of only one unit (I can't say it in English: timing belt and pulleys are divided in units, relases, and I advanced of one of it).
Then... problem desappeared (not at 100% but probably now it is good at 80%)!
But I have questions:
Now idle is good but engine loosed power at full throttle/high RPM (for example on highway in 5 gear and 80 - 90 mph). It's not a big loss of power, but it is noticeable.
So... I can't say if this is the correct position (good low rpm and idle but a little less high rpm) or if it was correct on the other position. Does only one unit change cause all this differences? (Note that I also compensate advance by retarding it on the distributor because it is mounted on cambelt. I retarded it in order to maintain the correct advance).
I can't check the correspondence between signs on pulleys and engine because I'd have to dismantle alternator pulley and I thing it's hard to refit-retension its belt!
Does someone has an idea?
Thanks and sorry for the long long post!!! And also sorry for my bad bad English!!!
It' s not the first time that I write on this forum for a problem on my Uno, this is a problem of a bad idling of engine (is a 1.1 with lambda and mono jetronic fuel injection). I did never solved the problem and some months ago i stopped to write on forum because my grandfather crashed the car (Not a big crash fortunately). But car was repaired for crash problems (anterior light and other stuff) and I'm trying to solve idle problems another time.
The problem appears some minutes after engine start (when it starts to warm up and idle rpm is decremented by ecu as soon as temperature rises up). I tried to check basilar stuff (sparks, air leaks, vacuum advance, lambda sensor, air temp and water temp sensors and similar) without finding any fault and without success in solving problem. Idle is bad and bad as soon as external temperature is low. THen it is better when engine is completely hot.
However it sounds as a poor mixture problem (engine looses rpm at idle and it cuts out or looses power if i rapidly push gas). Sometimes it cuts out also soon after I start it: rpm is at approx 1300 (it is incremented by ecu when cold) then it dies. It remembers me old carburettor engines: they died if started without mixture enricher when cold).
So I tried all that came in my mind...
After a lot of time and after trying to change sensors, sparks, testing etc... i tried to change timing on cambelt (!) (because i had a suspect that the machanich who changed timing belt could regulated it in retard). SO I advanced cambelt position respect to timing belt of only one unit (I can't say it in English: timing belt and pulleys are divided in units, relases, and I advanced of one of it).
Then... problem desappeared (not at 100% but probably now it is good at 80%)!
But I have questions:
Now idle is good but engine loosed power at full throttle/high RPM (for example on highway in 5 gear and 80 - 90 mph). It's not a big loss of power, but it is noticeable.
So... I can't say if this is the correct position (good low rpm and idle but a little less high rpm) or if it was correct on the other position. Does only one unit change cause all this differences? (Note that I also compensate advance by retarding it on the distributor because it is mounted on cambelt. I retarded it in order to maintain the correct advance).
I can't check the correspondence between signs on pulleys and engine because I'd have to dismantle alternator pulley and I thing it's hard to refit-retension its belt!
Does someone has an idea?
Thanks and sorry for the long long post!!! And also sorry for my bad bad English!!!