mt2man
Posted a lot
Posts: 1,364
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Right first off its a 1989 Ford Sierra 1.8 cvh.
I thought the problem was the coil breaking down so replaced it but it still cut out after driving for a mile or 2. So i removed the fuel filter (think its the filter its a sealed component with a fuel return on it too) and drained the line a little as the fuel looked abit yellow and it seemed to fix it for 100 miles or so but now its started cutting out again :/
Once its cut out i can start it again almost immediatly after and it will run again for a mile or 2 so it seems odd to me. I believe it did suck up some dodgy fuel a while ago but it seems the jets are clear and everything.
Any ideas?!
Jack
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Tank breather blocked? Try removing the cap just after it's stopped.
Nick
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1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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mt2man
Posted a lot
Posts: 1,364
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Would that produce the symptoms I have? I'm abit stumped, pretty sure it is a fuelling problem as it worked fine for 100 miles once I had played with the filter etc
If the breather is blocked does that mean its causing abit of a vaccum in the tank meaning its not sending fuel down the line? Because it does seem like its starved of fuel when it cuts out leaving me to think there is a block somewhere
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bortaf
Posted a lot
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Are you sure there's still a live at the coil when it wont start? i've had similar that ended up being a seized heater motor overheating the ign switch and cutting the ign live, sometimes connecting actions to the problem can take ages to suss ?
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R.I.P photobucket
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mt2man
Posted a lot
Posts: 1,364
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Hmm well I assume so, it never has any problem starting, it cuts out after around 2 miles of driving and starts up again straight after, as if it was starved of fuel for a second. I don't have to wait for anything to cool down
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mt2man
Posted a lot
Posts: 1,364
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Right this problem seems to be getting worse, by worse I mean more regular, I am completely stumped.
Pretty sure the breather isn't blocked in the tank as I can easily remove the fuel cap and can hear no vacum type noises when doing so.
I'm still not certain if its fuel or electrical, its so fustrating!
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Phil62
Part of things
Posts: 112
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Is it carb or injection if carb the arm/rod that works the fuel pump wears and could cause you a problem
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mt2man
Posted a lot
Posts: 1,364
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It is a carb model and oh i didnt think about the fuel pump actually! That is something to consider, but i don't understand why it would work for 100 miles after cleaning the fuel filter thing.
Does anyone know the name of the fuel filter thing i am talking about? haha, it has the inlet from the fuel pump a outlet to the carb and another outlet which i beleive is the return to the tank. Its a sealed unit and when i took it off i could hear a moving component inside which I'm not sure was meant to move or not, I'm hoping its just that unit which keeps blocking as i really cant be bothered to change the fuel pump haha
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Found this snippet on the web ....
Quote
Fuel pump operating rods wear. CFi engines have an in-tank electric pump which addresses this problem but on older carburettor engines the fuel pump is driven from an eccentric on the camshaft via a short rod - over time the rod wears shorter leading to decreased travel on the mechanical fuel pump, causing fuel starvation at higher engine speeds.
Unquote
Would this seem to fit?
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And this
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Worn/sticking fuel pump push rod, had it a few times on high mileage cars. Next time it happens try a squirt of petrol or brake cleaner down the carb, if it fires your problem is fuel related. It could also be the carb icing due to lack of pre heated air, VERY common on VWs and IIRC the 1.8 CVH has an intake air temperature sensor/valve which fails
Unquote.
Hope this helps.
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mt2man
Posted a lot
Posts: 1,364
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Found this snippet on the web .... Quote Fuel pump operating rods wear. CFi engines have an in-tank electric pump which addresses this problem but on older carburettor engines the fuel pump is driven from an eccentric on the camshaft via a short rod - over time the rod wears shorter leading to decreased travel on the mechanical fuel pump, causing fuel starvation at higher engine speeds. Unquote Would this seem to fit? That does actually make alot of sense  may try plumbing in my facet pump i was going to use in the mini and see if it works! |
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mt2man
Posted a lot
Posts: 1,364
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Any idea how i can work out if the fuel pump is okay and pumping enough fuel without replacing it?
I know for a fact is it pumping as even just turning over the engine with the fuel line running into a petrol can you can see fuel is coming out (i was trying to see if there was a block in the pipe anywhere or anything but it all seemed fine)
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bl1300
Posted a lot
Posts: 1,678
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How much fuel is coming out though when you turn the engine it needs to be a good possitive squirt not a trickle.
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Current fleet.
1967 DAF 44
1974 VW Beetle 1303s
1975 Triumph Spitfire MkIV
1988 VW LT45 Beavertail
1998 Volvo V70 2.5
1959 Fordson Dexta
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mt2man
Posted a lot
Posts: 1,364
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Yeah it was a good constant stream, like 2 or 3 pints at the pub kinda stream, not like a tap but a good steady flow if that makes sense? Haha
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marcyg
Part of things
Posts: 22
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Jan 19, 2013 19:54:07 GMT
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You ever get this sorted, along with the fuel economy prob? The cutting out bit could be a number of reasons. I drilled the air box, so if the thermostatic valve in the air box isn't working, or the pipe from the exhaust manifold cover has come off, it could be freezing the carb up. Also, the pierburg carb has a water controlled auto choke. Inside the housing is a bi-metallic spring and a heater wire. Make sure the heater wire is working fine. The springs are also known to go west. In the cold weather, I had problems with fuel economy, probably due to drilled air box and the exhaust on it. You could try getting an old skool VW garage to look at as it has the same carb as some of the older Golfs etc...
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Last Edit: Jan 19, 2013 19:54:46 GMT by marcyg
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mt2man
Posted a lot
Posts: 1,364
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Jan 19, 2013 20:04:27 GMT
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Still cant get it sorted! I'm a little lost for ideas, this was happening well before it got cold enough for the carb to be freezing.
I have no idea what mpg i am getting atm as i have only done about 150 miles in the last couple of months haha
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may try plumbing in my facet pump i was going to use in the mini and see if it works!