mgb wont start? any ideas ???
Discussion
Hi guys, recently bought a mgb project but cant get the thing to start.
So far:
New fuel tank
New fuel lines and filter
Stripped down and rebuilt the su's today and they are all working ok now
checked timing
cleaned plugs
cleaned points and they are sparking when opened
fitted a replacement coil off another car
It has a spark at each plug lead, and fuel is getting through, but when I crank it with the plugs in, it doesnt fire just coughs every once in a while, then the plugs get wet.
It also cranks a bit slow, tried running a jump lead from the pos on the bat to the starter but makes no differance.
Has good compression and I can see the valves moving up and down with the rocker off.
Also tried adjusting timing slightly, abd checked firing order but no differance??
Any ideas much appreciated! thanks
So far:
New fuel tank
New fuel lines and filter
Stripped down and rebuilt the su's today and they are all working ok now
checked timing
cleaned plugs
cleaned points and they are sparking when opened
fitted a replacement coil off another car
It has a spark at each plug lead, and fuel is getting through, but when I crank it with the plugs in, it doesnt fire just coughs every once in a while, then the plugs get wet.
It also cranks a bit slow, tried running a jump lead from the pos on the bat to the starter but makes no differance.
Has good compression and I can see the valves moving up and down with the rocker off.
Also tried adjusting timing slightly, abd checked firing order but no differance??
Any ideas much appreciated! thanks
thanks for the quick replies guys. I like to think I know what I am doing with the carbs. They are much the same as on my V8 bobtail so I;ve spent many an hour fiddling with su's lol.
Yep petrol is brand new, all new fuel lines throughout as the old ones where screwed (actually just rubber atm to get her running)
I will investigate the timing again tomorrow. Fuel and spark should do something. I mean it wouldnt even fire up on easystart which is affectuvely avgas????
I have heard of people talking about th compression ''blowning out'' a weak spark as you obviously cant tell if its sparking or not in the bore.
Ill start from fresh with the timing in the morning! After all you never know what muppet has been fiddling with the car previously when you buy a ''project''! :-)
Yep petrol is brand new, all new fuel lines throughout as the old ones where screwed (actually just rubber atm to get her running)
I will investigate the timing again tomorrow. Fuel and spark should do something. I mean it wouldnt even fire up on easystart which is affectuvely avgas????
I have heard of people talking about th compression ''blowning out'' a weak spark as you obviously cant tell if its sparking or not in the bore.
Ill start from fresh with the timing in the morning! After all you never know what muppet has been fiddling with the car previously when you buy a ''project''! :-)
Hi guys got it going in the end. Was a combination of things.
Timing was out by afew degrees which wasnt helping, but then seemed to not be getting any fuel.
I had forgot to check one of the float heights (front one) and it was miles out! That'll teach me not to try and strip, clean and rebuild 2 carbs in about an hour at the end of a hectic day lol!
Got the clutch working today too...and it moves! so not bad for an old car that hasnt moved in about 10 yrs!
Timing was out by afew degrees which wasnt helping, but then seemed to not be getting any fuel.
I had forgot to check one of the float heights (front one) and it was miles out! That'll teach me not to try and strip, clean and rebuild 2 carbs in about an hour at the end of a hectic day lol!
Got the clutch working today too...and it moves! so not bad for an old car that hasnt moved in about 10 yrs!
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