Technical Engine cranks, but won't start after rebuild
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Technical Engine cranks, but won't start after rebuild
Toothed wheel is from alternator or servo pump? If I remember crankshaft sprocket is not near crankshaft sensor, but that toothed wheel, which is running belt from either alternator or servo pump. Does it have any marks on it to align it?
You the man mate, rotated that sprocket one bolt clockwise and he started immediately, but still you can't turn it on without little bit of throttle when cold. Engine is working so quietly and steadily, amazing. There are 3 bolts on that sprocket, so will try to move it to 3rd one tomorrow.
When I will have extra funds will get an oscilloscope to test every electric part.
Thank you very much for your GREAT and FAST help. Who would've thought it's about alternator/servo sprocket.
When I will have extra funds will get an oscilloscope to test every electric part.
Thank you very much for your GREAT and FAST help. Who would've thought it's about alternator/servo sprocket.
The crankshaft pulley with the crank sensor teeth produce a signal in the crank sensor. The ECU receives the signal and calculates when to cause spark at correct time for each cylinder and also the correct time to trigger each fuel injector when each inlet valve is open.
That is why it is essential the toothed pulley fitted correctly.
That is why it is essential the toothed pulley fitted correctly.
If you move pulley with teeth it just won't run at all.
Needing a little throttle to start isn't a big problem to me , you just learn to use a little throttle.
If the car has an idle control valve it could be a little stuck or not working.
Search on internet for make and type of fuel injection system and learn how idle speed is controlled. Then check the components on your car.
I would say 800kms then renew oil and oil filter.
Was the engine block bored out for slightly bigger pistons?
Cylinder head bolts were they tighten to a set torque then turn a given number of degrees?
Needing a little throttle to start isn't a big problem to me , you just learn to use a little throttle.
If the car has an idle control valve it could be a little stuck or not working.
Search on internet for make and type of fuel injection system and learn how idle speed is controlled. Then check the components on your car.
I would say 800kms then renew oil and oil filter.
Was the engine block bored out for slightly bigger pistons?
Cylinder head bolts were they tighten to a set torque then turn a given number of degrees?
Friend has 1.1 Punto 1994 and it fires without throttle at all, so I assume it can be tweaked.
I already changed an oil and oil filter, will do it again after 800 kms.
Nope, I just honed the cylinders to fit new piston rings. Honed them manually with 3 leg tool.
Cylinder head bolts were tighten by elring gasket specs, 30 nm, 40 nm, 90 degrees, 90 degrees if I remember well.
I already changed an oil and oil filter, will do it again after 800 kms.
Nope, I just honed the cylinders to fit new piston rings. Honed them manually with 3 leg tool.
Cylinder head bolts were tighten by elring gasket specs, 30 nm, 40 nm, 90 degrees, 90 degrees if I remember well.
Yep clean your ideal air valve to fix start issue.
If cleaning it doesn't fix it you need a new idle air valve.
No you don't need to re-torque head bolts tightened that are tightened in the way you describe.
Yes definitely change oil and filter after 800kms
If cleaning it doesn't fix it you need a new idle air valve.
No you don't need to re-torque head bolts tightened that are tightened in the way you describe.
Yes definitely change oil and filter after 800kms
wow, what an ordeal... Was just reading this through from the start thinking its gonna be the bottom pulley on the wrong way but you got there without me in the end.. lol
Just for future reference, if you look at that pulley there is a tiny little hole in it that a small pip should slot into so you know you have it the right way... You pip may have snapped off, wouldnt be the first time, but you should be able to tell where is was anyway.
And the starting thing, yes it should require zero pedal to start and Jack has suggested first thing to check. Shame they are getting so rare now, back in the good old days I would have said just pop down a scrap yard and grab a couple of throttle bodies and swap them over but them days seem long gone. That an these mpi P75 engines are even rarer as people steal them to engine swap other little fiats (me included, multiple times, I am infact in middle of sticking that engine in an old 750panda lol)
Just for future reference, if you look at that pulley there is a tiny little hole in it that a small pip should slot into so you know you have it the right way... You pip may have snapped off, wouldnt be the first time, but you should be able to tell where is was anyway.
And the starting thing, yes it should require zero pedal to start and Jack has suggested first thing to check. Shame they are getting so rare now, back in the good old days I would have said just pop down a scrap yard and grab a couple of throttle bodies and swap them over but them days seem long gone. That an these mpi P75 engines are even rarer as people steal them to engine swap other little fiats (me included, multiple times, I am infact in middle of sticking that engine in an old 750panda lol)
Thanks a lot for pulley info mate. Will check if it has tooth on it.
Will try to clean off IAC valve, although I cleaned it some time ago.
What I really like about these little cars is how they accelerate in traffic, bigger cars can't match them. Friend of mine has 1994 Punto, 1.1, SPI, 6 speed, limited edition, what a little beast that one is.
I'm not an expert, but this engine of mine is running for 300k km now, no distortion on cylinder head, only few little black marks on cylinder walls and pistons, but hard to see. So these FIRE engine seems really good.
I have a leaking camshaft gasket, so will need to replace it these days, only few drops of oil underneath the car, so not a big issue. I suspect valve cover gasket and oil pan as well. Will fix one at time and check for leaks.
Good luck with your swapping journey, mate!
when I rebuilt my 1994 1.1 Punto 55 I noticed it isn't possible to get anything incorrectly positioned such as crank sensor wheel or camshaft. the important ones are keyed or doweled and you can't get the camshaft out of phase as the drive pulley is keyed with a non-removable key. The plug leads are too short to get them wrong except maybe 3 & 4. And a single-point injection Punto should start almost immediately it is cranked, within 3 or 4 engine revolutions. If it takes longer but runs more or less ok look for low fuel pressure as the cause. I have never heard of the pressure regulator giving trouble, more likely a dirty fuel pump pickup filter inside the tank or a neglected filter beside the tank. I once had the injector unit stick in the closed position after a lengthy wait for a spare part, wouldn't start, removing it and fressing the pintle inwards to free it cured the trouble.
