55ant
|
| posted on 3/9/09 at 09:03 AM |
|
|
Starting now running, but in a weird way.....
bit of help needed guys,
started the car this morning and it got going, ran fine for a bit then cut out, maybe 10-15 seconds??
i have now done this half a dozzen times. i have no idea what is going on?? any help would be great!
webber 38 dgas on pinto (choke removed but have not had any problems starting), no mega squirt, just basic carb/engine (engine is bored to 2.1 with
oversize pistons and kent fast road cams)
[Edited on 3/9/09 by 55ant]
[Edited on 3/9/09 by 55ant]
|
|
|
|
|
cd.thomson
|
| posted on 3/9/09 at 09:06 AM |
|
|
for the people who dont know your setup, whats the engine, what induction/fueling are you using, what engine management are you using, what stage of
the build (with the engine) are you at?
Craig
|
|
|
55ant
|
| posted on 3/9/09 at 09:08 AM |
|
|
cheers, edit made
|
|
|
grazzledazzle
|
| posted on 3/9/09 at 09:09 AM |
|
|
It is difficult to diagnose without seeing it, but could be lack of fuel pressure. Try cleaning the filters and checking the pump.
|
|
|
daviep
|
| posted on 3/9/09 at 09:09 AM |
|
|
What engine? What ignition system? What fuel system? Does it restart immediately?
Give us a clue
Damn must learn to type faster
Davie
[Edited on 3/9/09 by daviep]
|
|
|
Mr Whippy
|
| posted on 3/9/09 at 09:15 AM |
|
|
Why did you take the choke off? You’ll need it to keep the engine going in the winter, I have the same carb on my 2.8 v6 and I know it would be
hopeless without the choke flaps. That carb on a pinto is also very bad on fuel, your better with the 32/36 DGV one.
[Edited on 3/9/09 by Mr Whippy]
Fame is when your old car is plastered all over the internet
|
|
|
55ant
|
| posted on 3/9/09 at 09:16 AM |
|
|
choke was elready off when i got the car, the housing has been ground of aswell so no way of putting on back on.
[Edited on 3/9/09 by 55ant]
|
|
|
nick205
|
| posted on 3/9/09 at 09:21 AM |
|
|
My guess would be a vacuum in the fuel tank causing starvation. Either that or weak pumo / blocked fuel line.
|
|
|
Mr Whippy
|
| posted on 3/9/09 at 09:28 AM |
|
|
good grief, looks rather butchered. Personally if this cars for road use I'd buy another one. Here's a company I've bought things
from in the past, there a few others too. You might even be lucky and get just the top if they have some spare lying around.
linky
[Edited on 3/9/09 by Mr Whippy]
Fame is when your old car is plastered all over the internet
|
|
|
55ant
|
| posted on 3/9/09 at 09:50 AM |
|
|
ok, well i havent got it going but ive taken the fuel filter out and its got plenty of bits of crap in it, but the car was running fine yesterday?? i
took the carb of yesterday and then when i put it back on it took a while to start, i thought thats just due to filling the float chamber, would this
have weekened the pump?
also after walking back to the car it looks like is leaked a trail of petreol down the drive where i have moved it out? not to much, say about a cans
worth? (yep, precise measurements and all) could this be the sign of something giving up? or given up?
so this carb is pretty poor anyway should i just go down the bike carb route as i will need a seperate pump for that anywayz?
[Edited on 3/9/09 by 55ant]
[Edited on 3/9/09 by 55ant]
|
|
|
jollygreengiant
|
| posted on 3/9/09 at 09:58 AM |
|
|
It could also be a blocked pre filter in the tank.
Engine not running, so you start it and it draws fuel through the filter. This causes all the localised muck in the fuel tank to be drawn into what is
left of the clear pre filter causing it to block and fuel starvation then causes the engine to stop. With the engine stopped, the muck around the pre
filter falls off and you restart the engine. The cycle begins again.
Beware of the Goldfish in the tulip mines. The ONLY defence against them is smoking peanut butter sandwiches.
|
|
|
55ant
|
| posted on 3/9/09 at 10:02 AM |
|
|
ok that could make sense, the car is low on fuel so i have just topped it up, how do i go about cleaning a pre-filter, or is that just a term...
|
|
|
Mr Whippy
|
| posted on 3/9/09 at 10:18 AM |
|
|
the internal filter item 10
[Edited on 3/9/09 by Mr Whippy]
 
Rescued attachment W38DGAS.gif
Fame is when your old car is plastered all over the internet
|
|
|
Peteff
|
| posted on 3/9/09 at 10:47 AM |
|
|
I took the choke off mine. I just used to pump it 6 or 8 times then rev it a bit to warm it up after it started. Drop something over the top of the
carb and start it on half throttle it might be a blocked jet.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
|
|
|
55ant
|
| posted on 3/9/09 at 10:57 AM |
|
|
firstly thanks for all your help, im off to go and get a new fuel filter,
bad news is i dont have the pre filter, took the bolt of and there is nothing in there? floats are all in good condition, hopefully a new filter will
sort it out, and topping it up with petrol. im going to get myself a bike carb set up. i love the car and its great but the time it takes to get going
is stopping me from taking it out, either for a drive or somewhere where i may have to leave it for a while.
[Edited on 3/9/09 by 55ant]
|
|
|
omega 24 v6
|
| posted on 3/9/09 at 11:47 AM |
|
|
My guess is that the floats in the carb float chamber have come away from the arm that works the chamber valve ( seen it many times in the pinto race
engine)
Usually caused by vibration and the solder breaks away causing the bowl to overflow into the carb venturi's and flood it BIG TIME.
Smell of petrol is really strong as well and if you look into the venturis when the engine is stopped you can usually still see the fuel dripping
in.
EDITED TO ADD that if you are using an electric pump then possibly you will have pumped so much fuel into the engine that it will seep down past the
rings and into the sump thereby dilutting your oil as well
[Edited on 3/9/09 by omega 24 v6]
If it looks wrong it probably is wrong.
|
|
|
55ant
|
| posted on 3/9/09 at 11:59 AM |
|
|
floats are all attatched, taken the carb apart and all seems fine, quite a bit of crap in the chamber though, mainly metal filings? from pump
possibly? i dont know much about fuel pumps but can be to complicated????
|
|
|
MakeEverything
|
| posted on 3/9/09 at 12:06 PM |
|
|
Check the coil.
If youve been workin on it with the ignition on, you might have cooked the coil. If its overheating it will cut out like this. Same happened with my
when i had the dutton running a xflow and Dgas.
Took me ages, and i checked everything above, and the last thing was the coil 
It worked well after that (and replacing the dizzy - separate issue).
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
|
|
|
britishtrident
|
| posted on 3/9/09 at 12:11 PM |
|
|
Choked idle jet(s) --- ie crap from the fuel tank blocks the smallest jets first.
[Edited on 3/9/09 by britishtrident]
|
|
|
55ant
|
| posted on 3/9/09 at 12:19 PM |
|
|
ok, how can i check the coil pack? it runs fine for about 10 seconds? and how can i make sure the idle valves are clear in the carb?
|
|
|
02GF74
|
| posted on 3/9/09 at 12:39 PM |
|
|
an engine needs a spark and correctly metered fuel to run.
it appears we have not narrowed it down to which of the two is at fault.
if the engine stops a few moments after starting when stationary and can be repeated, you have a very good chance of tracing the problem.
I'd suggest strip the carbs, clean them out and reassemble. Then rig up a bottle of petrol hung above the carb andconnect with a pipe.
Start engine and see how long it runs.
for example, here was me running my Z engine, using two funnels.
 
Rescued attachment DSC03764.JPG
|
|
|
55ant
|
| posted on 3/9/09 at 01:57 PM |
|
|
right, i have got it running! but, only by adjusting the 2 brass bolts near the top of the carb (fuel flow bolts??) however only the one nearest the
engine? then when i can keep it running it will only run at about 2000rpm, then its rough and not very good at responding??? not sure if this helps
narrowing it down? im still thinking its the idle fuel valves? would that make sense that i have been adjusting the acelorator jets to maintain an
idle?
[Edited on 3/9/09 by 55ant]
|
|
|
55ant
|
| posted on 3/9/09 at 03:58 PM |
|
|
ok it continues. right i had it apart, cleaned it all out and have retuned it (found a guide online) and now it runs ok/good, idle seems high, then
after a quick, round the block test, it seemed fine but died when idling, i stopped mainly though due to a peircingly high pitch noise coming from the
carb
any ideas chaps, starting to loose faith in perseverance.
|
|
|
Peteff
|
| posted on 3/9/09 at 04:11 PM |
|
|
It sounds like you are sucking air in somewhere you should not be. Check it is tightened down and all the gaskets are sealing.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
|
|
|
