Scimba - Back in the game

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Crowther
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Re: Scimba - Back on form

Post by Crowther » Wed Apr 12, 2017 5:36 pm

Jim, when you say tap do you mean tap, or wallop?


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Re: Scimba - Back on form

Post by scimjim » Wed Apr 12, 2017 6:09 pm

:-)


Jim King

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

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Re: Scimba - Back on form

Post by Rev Light » Thu Apr 13, 2017 7:23 am

I had this sort of issue last year. It turned out that the battery was on its last legs.

Sometimes it did not have enough oomph to get the starter going. It was intermittent, but just got more and more common. Battery was cheaper than a Starter. Which was lucky.....

Steve



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Re: Scimba - Back on form

Post by Scimher » Thu Apr 13, 2017 9:30 am

If I haven't used my SE5 for a while there is often a 'click' & nothing else when I first turn the key.......engine always turns over on the 2nd occasion - it has only been doing this for about the last eight & a half years (since she was re-commissioned...) Just part of her character!



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Re: Scimba - Back on form

Post by Crowther » Thu Apr 20, 2017 9:59 am

Drove to work in the Scim today. It didn't misbehave at all. I decided not to try reverse - no point spoiling the atmosphere.


New and proud owner of "Scimba" ('72 SE5a).
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Re: Scimba - Back on form

Post by Crowther » Wed May 24, 2017 10:51 pm

Another year, another MOT. Passed with flying colours! A couple of new bushes on the gearbox rods and reverse is back in the arsenal.


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Roger Pennington
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Re: Scimba - Back on form

Post by Roger Pennington » Wed May 24, 2017 10:53 pm

Well done on the MOT! :D


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Re: Scimba - Back on form

Post by Crowther » Sat May 27, 2017 10:15 pm

Thanks Roger. Sadly the old misfire/bogging problem is back. I went for a 40 minute drive this evening, blowing out the cobwebs. As always the Scim ran very well. After about 30 mins I found myself on an empty dual carriageway in 4th+OD. So I put my foot down only for the Scim to bog wildly, and after that I was in limp-home mode popping at every roundabout. The symptoms are:
- Bogging and misfiring at full throttle (only when hot)
- Tacho drops to zero at low revs (near idle, again only when hot)
- Misfiring while decelerating

It was dark when I got back but I had a quick look under the bonnet. The ignition coil was very hot which can't be helping.

Am I right in saying that the tacho dropping means it is definitely a problem with the LT circuit? Could it be the ignition switch? Could I have the wrong coil?


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Re: Scimba - Back on form

Post by scimjim » Sat May 27, 2017 10:55 pm

Definitely sounds like coil, which probably means it's a fuel problem :-)


Jim King

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

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Re: Scimba - Back on form

Post by Crowther » Sat May 27, 2017 11:25 pm

Ha! But the tacho wouldn't bounce around, or drop to zero with the engine running unless it was ignition related, no? I'm so frustrated that this problem has come back.


New and proud owner of "Scimba" ('72 SE5a).
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Re: Scimba - Back on form

Post by Crowther » Sat May 27, 2017 11:53 pm

Reading around on here I've seen a few mentions of an earth wire between the top distributor plate and the body. Mine has none. I can understand how a bad earth could affect the ignition, but not why the problems only start after 30 minutes!


New and proud owner of "Scimba" ('72 SE5a).
Learning slowly and driving quickly...

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Re: Scimba - Back on form

Post by Crowther » Tue May 30, 2017 9:16 pm

I could have sworn there was 9V at the coil +ve last time I checked! But no, with the engine running the trusty multimeter shows just over 12V between the coil's +ve stud and earth. I was under the impression that my 5a had a eureka wire. Has it somehow lost its resistance? Has a previous owner defeated it? This might explain the problems I'm getting after 30 minutes on the road - the coil is frying.


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Learning slowly and driving quickly...

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scimjim
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Re: Scimba - Back on form

Post by scimjim » Tue May 30, 2017 9:53 pm

Check the resistance of the wire?

Or just fit a seperate ballast resistor?


Jim King

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

Crowther
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Re: Scimba - Back on form

Post by Crowther » Tue May 30, 2017 11:39 pm

I'll try a 12V coil and if the starting doesn't suffer I'll leave it like that. I think I'm on the right lines though.


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Roger Pennington
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Re: Scimba - Back on form

Post by Roger Pennington » Wed May 31, 2017 1:30 pm

Crowther wrote:I could have sworn there was 9V at the coil +ve last time I checked! But no, with the engine running the trusty multimeter shows just over 12V between the coil's +ve stud and earth. I was under the impression that my 5a had a eureka wire. Has it somehow lost its resistance? Has a previous owner defeated it? This might explain the problems I'm getting after 30 minutes on the road - the coil is frying.
I'm no electrical guru, I'm afraid, but I think it will only show 9v if measured when the points are closed, won't it? I think I remember this being pointed out to me when I mentioned it some time ago?


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