running problems

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he trys hard
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Post by he trys hard » Sun Mar 25, 2018 6:24 pm

hi guys need the benefit of your advice again please, started the 5a up today to take for a run in the sun and was idling rough and when driven was down on power and seems to be missing also when parked and revved up to about 2500 it starts to pop and bang from exhaust. was running fine when parked up two weeks ago any pointers of where to start much appreciated many thanks.



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Post by rebel alliance » Sun Mar 25, 2018 6:36 pm

Could be HT leads shorting out Have a look when its dark.



he trys hard
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Post by he trys hard » Sun Mar 25, 2018 6:50 pm

rebel alliance wrote:
Sun Mar 25, 2018 6:36 pm
Could be HT leads shorting out Have a look when its dark.
the leads are only 6 months old from gw ? will check though



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peter freeman
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Post by peter freeman » Sun Mar 25, 2018 7:11 pm

Well it can only be fuel or electrics assuming that the timing has not moved - could be the advance stuck with not being used.
Last edited by peter freeman on Sun Mar 25, 2018 7:25 pm, edited 2 times in total.



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scimjim
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Post by scimjim » Sun Mar 25, 2018 7:20 pm

How far was the run you did 2 weeks ago? I started 8 ball the other day and it wasn’t happy - the plugs had fouled up because it hasn’t been on a decent blast for ages. Cleaned them up and awesomeness is restored :D


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Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

he trys hard
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Post by he trys hard » Sun Mar 25, 2018 7:43 pm

scimjim wrote:
Sun Mar 25, 2018 7:20 pm
How far was the run you did 2 weeks ago? I started 8 ball the other day and it wasn’t happy - the plugs had fouled up because it hasn’t been on a decent blast for ages. Cleaned them up and awesomeness is restored :D
it was only started and run in the garage for 5-10 mins, would like to think that was it will take out and clean them up tomorrow night ,would that cause the popping and banging at higher revs though ?



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Post by he trys hard » Sun Mar 25, 2018 7:47 pm

peter freeman wrote:
Sun Mar 25, 2018 7:11 pm
Well it can only be fuel or electrics assuming that the timing has not moved - could be the advance stuck with not being used.
any advise how I can check the advance?



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Post by Nick » Sun Mar 25, 2018 8:14 pm

Strobe is best


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Not over the hill, just going up it faster !

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Post by peter freeman » Sun Mar 25, 2018 8:35 pm

Suck on the air pipe from bottom of carb and with the dizzy cap off you should be able to see the "table" move - does not test the weights though. Try squirting a dose of silicone spray under the table.



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Post by he trys hard » Mon Mar 26, 2018 7:40 pm

peter freeman wrote:
Sun Mar 25, 2018 8:35 pm
Suck on the air pipe from bottom of carb and with the dizzy cap off you should be able to see the "table" move - does not test the weights though. Try squirting a dose of silicone spray under the table.
ok so tried as you suggested and yes it did move but not much and had to suck like hell ,there is a slot below table with a peg running in it should the table turn for the full length of slot ? because its not



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Post by peter freeman » Mon Mar 26, 2018 8:31 pm

From memory no.



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Post by he trys hard » Wed Mar 28, 2018 8:10 pm

had another look tonight and the advance seems to be working ok ,checked timing with shiny new light that appears to be as manual says so all good there. thinking carb next ? would that give the slightly lumpy hesitant feel under throttle and the popping from exhaust at 2500-3000 revs ? its the 40 dfa carb I have a service kit is it worth fitting that next see how that goes? thanks again guys



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Post by peter freeman » Wed Mar 28, 2018 8:17 pm

Can't do any harm/



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Post by he trys hard » Wed Mar 28, 2018 10:04 pm

peter freeman wrote:
Wed Mar 28, 2018 8:17 pm
Can't do any harm/
want a bet? :lol:



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Post by peter freeman » Thu Mar 29, 2018 8:01 am

a man after my own heart. I have a "spare" carb which I cannot find the problem with - won't run at low speeds and its only a few years old. Fitted a over 40 year carb which runs fine. One of these days I will have a 2nd go at the newer carb.



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