Just picked a GTM kit car with a A+ series engine from a 1993 cooper, its fitted with HIF44 carbs and standard points type dizzy with vacume advance fitted and standard coil (no electronic business). The car just about starts and ticks over (very rough) with a little bit of choke, but as soon as you try and poick the revs up it dies. Its had new leads, plugs, dizzy and coil [ack but still the same. The plugs are sooty when taken out. Its got an new electronic fuel pump (that was fitted after this problem started so think i can discount that). The float chamber needle seems to be working fine, and i can't see any cracks in the intake manifold or carb body. The only air leak on any pipes i have come across is in the pipe between the crankcase breather to carb. Oh and the fuel tank and lines have all been drained and cleaned. The car ran fine withn the current set up for 9months until this happened.
I've now took the carbs off and they seem ok, nothing obvious, but not really gone any further yet as wanted to read up on exactly how the 44 carbs work. Am i right in thinking the hole to the side of the suction cup to lift the piston actually passes through the face of the piston?
So any suggestions??? I'd just get another set of carbs to throw on top test it if anyone has a cheap set knocking about.
Engine Dies As Soon As You Give It Any Throttle
Started by
austen_mini
, Sep 17 2010 06:23 AM
10 replies to this topic
#2
Stevee
-
- Members
- 0 posts
- Local Club: #
Posted 17 September 2010 - 06:27 AM
the carb properly needs setting up carbs always need setting up after so many years cause they were
sooty spark plugs means the mixture is running to lean (to much air) :]
get the carb tuned it first
start with the cheaper option first instead of spending loads and finding out its something simple
sooty spark plugs means the mixture is running to lean (to much air) :]
get the carb tuned it first
start with the cheaper option first instead of spending loads and finding out its something simple
#3
austen_mini
-
- Noobies
-
- 13 posts
Learner Driver
Posted 17 September 2010 - 06:28 AM
the carb properly needs setting up carbs always need setting up after so many years cause they were
sooty spark plugs means the mixture is running to lean (to much air) :]
get the carb tuned it first
start with the cheaper option first instead of spending loads and finding out its something simple
i thought sooty was rich mix???
#4
Wil_h
-
- Members
-
- 3,244 posts
Up Into Fourth
Posted 17 September 2010 - 07:33 AM
Sounds carb related, but I don't se why a carb would need any alterations, even it it had been sat in a cave for a millenia. If it's right it's right.
It sounds like a service of the carb is the next step. take the dash pot off and clean all in side with carb cleaner and check that the piston move freely. then check the float bowl for dirt and clean. when it's back on check don't forget to put oil in the damper.
by the way, the crack in the breather pipe is not good. Infact this would cause poor running.
It sounds like a service of the carb is the next step. take the dash pot off and clean all in side with carb cleaner and check that the piston move freely. then check the float bowl for dirt and clean. when it's back on check don't forget to put oil in the damper.
by the way, the crack in the breather pipe is not good. Infact this would cause poor running.
#5
JakeJakeJake
-
- Members
-
- 836 posts
One Carb Or Two?
Posted 17 September 2010 - 09:50 AM
the carb properly needs setting up carbs always need setting up after so many years cause they were
sooty spark plugs means the mixture is running to lean (to much air) :]
get the carb tuned it first
start with the cheaper option first instead of spending loads and finding out its something simple
Sooty is too rich, so too much fuel.
Do you mean a new dizzy? or just a cap?
Have you checked the ignition timing?
#6
austen_mini
-
- Noobies
-
- 13 posts
Learner Driver
Posted 17 September 2010 - 09:53 AM
the carb properly needs setting up carbs always need setting up after so many years cause they were
sooty spark plugs means the mixture is running to lean (to much air) :]
get the carb tuned it first
start with the cheaper option first instead of spending loads and finding out its something simple
Sooty is too rich, so too much fuel.
Do you mean a new dizzy? or just a cap?
Have you checked the ignition timing?
dizzy completely replaced, and messed with timing (oops should have said that in initial post)
Wondering if sootyness is because running it on part choke at tick over, then as open up throttle not enough fuel (for what ever reason) hence it dies. Main jet isn't blocked, but wondering if piston is not lifting, hence no fuel other than idle. If it was so rich it cut out on opening throttle i would imagine the plugs would be soaking wet????
#7
Nial
-
- Noobies
-
- 75 posts
Stage One Kit Fitted
Posted 17 September 2010 - 10:19 AM
Just picked a GTM kit car with a A+ series engine from a 1993 cooper, its fitted with HIF44 carbs
I've now took the carbs off and they seem ok
Is it carbs or a single carb?
Can you get hold of a colourtune to get the idle mixture roughly right?
If the plugs are sooty it might be _very_ rich at idle, as soon as you open the
throttle the damper causes it to get even righer which kills it.?
Screw the mixture adjustment screw out a bit to see if that helps things.
Nial.
#8
austen_mini
-
- Noobies
-
- 13 posts
Learner Driver
Posted 17 September 2010 - 10:28 AM
Just picked a GTM kit car with a A+ series engine from a 1993 cooper, its fitted with HIF44 carbs
I've now took the carbs off and they seem ok
Is it carbs or a single carb?
Can you get hold of a colourtune to get the idle mixture roughly right?
If the plugs are sooty it might be _very_ rich at idle, as soon as you open the
throttle the damper causes it to get even righer which kills it.?
Screw the mixture adjustment screw out a bit to see if that helps things.
Nial.
single su carb
Will have a play with mixture screw. Was wondering if it was worth buying a service kit while its off and rebuilding it.
#9
Nial
-
- Noobies
-
- 75 posts
Stage One Kit Fitted
Posted 17 September 2010 - 03:17 PM
single su carb
Will have a play with mixture screw. Was wondering if it was worth buying a service kit while its off and rebuilding it.
When you've got it running better and want to optimise things it might be an idea but you should be
able to get it running much better as it is.
You don't have to take it off to get at the mixture screw (probably) it'll be hanging out the back
of the GTM!
Nial.
#10
morley
-
- Members
-
- 903 posts
One Carb Or Two?
- Location: Devon
Posted 17 September 2010 - 03:26 PM
I had the exact problem.
Try replacing the float needle valve but for now try cleaning up the spark plugs as best as you can or get an old set which work if you have spares lying around and then try weakening the mixture.. screw out is to weaken, then to to a rolling road to get it set up!
Try replacing the float needle valve but for now try cleaning up the spark plugs as best as you can or get an old set which work if you have spares lying around and then try weakening the mixture.. screw out is to weaken, then to to a rolling road to get it set up!
#11
austen_mini
-
- Noobies
-
- 13 posts
Learner Driver
Posted 20 September 2010 - 07:15 AM
I had the exact problem.
Try replacing the float needle valve but for now try cleaning up the spark plugs as best as you can or get an old set which work if you have spares lying around and then try weakening the mixture.. screw out is to weaken, then to to a rolling road to get it set up!
i thnk the plugs are fouled up ig time now as it won't even fire with cold start. mixture screw was screwed right in, so back it off now and will clean plugs up for another go
1 user(s) are reading this topic
0 members, 1 guests, 0 anonymous users
