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Wouldnt Start - Then Ran Like Bag Of Spanners - Drives Lumpy


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#1 happydude2012

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Posted 22 July 2018 - 02:56 PM

Ok New headache

 

Yesterday had a bit of run over when i switched off the ignition  - never happened before really, 

 

Drove to work today no problem,

 

1) Went start up in carpark after work and it turned over cleanly but wouldnt start.

2) Then it started, ran like a bag of spanners for about 30 seconds and cut off.

3) Started  ok.

4) Driving home, gets really lumpy, starts rumbling and shuddering 

5) Pull over, give it some revs, nothing, smooth as you like.

6) Start driving again, ok for about 4 miles then the lumpy nightmare again,

7) Pull over,  sweet as nut on tickover,revs fine.

 

Some nice chaps from brum mini club pull over and wing man me home - no lumpy drive for rest of drive.

 

what the hell is wrong with this thing now? quick point, the fuel was minimum as i left work, maybe some crap got into the carb? did put £20 in on the way home but that didnt really resolve it.

 

 

 



#2 Bat

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Posted 22 July 2018 - 03:05 PM

Hi,

If it's crap in the carb putting more fuel in the tank won't shift it.

It could be running weak or could be an ignition system problem.

You may have an air leak but they don't tend to come and go.

Dashpot oil ok?

Cheers  :proud:



#3 happydude2012

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Posted 22 July 2018 - 03:54 PM

would the dashpot oil cause that level of power loss and lumpiness?
 



#4 mk1leg

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Posted 22 July 2018 - 05:24 PM

sounds like dirty float chamber some times at fuel pumps the last few lts are sucked up rubish from there tanks and its only when you refill your tank it disturbs the **** and this ends up in the float chamber 



#5 panky

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Posted 22 July 2018 - 05:28 PM

My Commer did exactly this yesterday (SU carb conversion) there was hardly anything in the dash pot when I checked. Topped it up and running sweet again :proud:



#6 Retroman

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Posted 23 July 2018 - 12:29 AM

Low dashpot oil does cause really bad running and bad starting, but its more consistant

 

Could be many things...

 

Water in fuel, coil, condensor, plug leads, dizzy cap spark tracking, loose terminals, a broken wire, bad earth, loose battery terminal



#7 happydude2012

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Posted 23 July 2018 - 05:27 AM

im liking the fuel/float tank bits idea - took it for another razz last night and absolutely ran like a legend.



#8 happydude2012

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Posted 25 July 2018 - 07:38 AM

can anyone tell me please, is there a general rule with maintaining fuel systems, eg,what in should clean out regularly.



#9 cal844

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Posted 25 July 2018 - 11:49 AM

Check the battery cables are tight, also check the coil connections are tight

Fit an online fuel filter too

#10 cal844

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Posted 25 July 2018 - 11:50 AM

Check the battery cables are tight, also check the coil connections are tight

Fit an online fuel filter too

#11 happydude2012

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Posted 25 July 2018 - 02:51 PM

Do you mean inline? ive seen those in the boot off the petrol tank right?



#12 cal844

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Posted 25 July 2018 - 04:10 PM

Do you mean inline? ive seen those in the boot off the petrol tank right?


Yes that's them, I usually fit mine underneath the boot floor




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