SST Ti MISFIRE, FALLING REVS

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SST Ti MISFIRE, FALLING REVS

Post by gtcse8 » Tue Dec 08, 2015 4:36 pm

HELP NEEDED

My SST Ti has an annoying and worrying problem, the revs drop and it seems to misfire when I turn the heater on, it gets worse as the heater is increased.

It does NOT stall, but is very worrying at the lights.

I have followed Steve Oakes saga with his misfire, but that came right on its own when he replaced the engine I believe.

Not going to those lengths just yet.

I have tried everything I can think of without replacing major parts such as ECU and dizzy etc.

Any thoughts out there?.

Cheers Mark


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Re: SST Ti MISFIRE, FALLING REVS

Post by peter freeman » Tue Dec 08, 2015 6:48 pm

Do you mean it misfires when it gets hot or when you physically turn the heater on - and by heater do you mean heater fan or change the temp output from the heater.



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Re: SST Ti MISFIRE, FALLING REVS

Post by Oaksey » Tue Dec 08, 2015 7:18 pm

The fault on Dad's old sabre was down to one of the wires in the loom that runs along the chassis by the turbo. There was one that had its insulation damaged including a screen layer. It was sorted when the engine was out


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Re: SST Ti MISFIRE, FALLING REVS

Post by gtcse8 » Tue Dec 08, 2015 7:27 pm

Cheers Josh

Peter, it happens when the blower motor is turned on.

I can now follow up on Josh`s info and keep you all posted.

Mark


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Re: SST Ti MISFIRE, FALLING REVS

Post by swoakes » Tue Dec 08, 2015 7:37 pm

Yes as josh says

Image

Take a look at my thread here

viewtopic.php?f=20&t=16823&hilit=misfir ... 45#p324786


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Re: SST Ti MISFIRE, FALLING REVS

Post by peter freeman » Tue Dec 08, 2015 9:05 pm

It will probably be quicker if you just run new wires from the heater fan switch to the heater motor - you can then leave the sorting out of the problem until the summer when ripping the wiring apart is not so difficult - or cold and wet



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Re: SST Ti MISFIRE, FALLING REVS

Post by CNHSS1 » Tue Dec 08, 2015 9:11 pm

I had running issues, albeit not heater related, due to the 'quality' of the cable from ecu to air flow meter. It looked like some domestic household cable rather than automotive. I assumed a PO had bodged it, but it turns out reliant were potless at the time and used anything to hand


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Re: SST Ti MISFIRE, FALLING REVS

Post by swoakes » Wed Dec 09, 2015 12:36 am

peter freeman wrote:It will probably be quicker if you just run new wires from the heater fan switch to the heater motor - you can then leave the sorting out of the problem until the summer when ripping the wiring apart is not so difficult - or cold and wet
When I had the problem I fed the fan from a battery separate from the car and it still misfired :?


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Re: SST Ti MISFIRE, FALLING REVS

Post by CNHSS1 » Wed Dec 09, 2015 1:27 am

Suggests its interference, turbo heat often wrecks the heater motor supressors and if less than ideal cable was used by factory 8e little or no shielding, it could well be that


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Re: SST Ti MISFIRE, FALLING REVS

Post by Mateybass » Wed Dec 09, 2015 2:36 am

CNHSS1 wrote:Suggests its interference, turbo heat often wrecks the heater motor supressors and if less than ideal cable was used by factory 8e little or no shielding, it could well be that
Yep, sounds like interference if it gets worse with motor speed too.


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SST Ti MISFIRE, FALLING REVS

Post by gtcse8 » Sat Aug 25, 2018 9:29 am

PROGRESS UPDATE.

To paraphrase my namesake, Richard Wilson, of One Foot In The Grave, I DON`T BELEIVE IT, my misfire has gone. :D

Long story cut short, but I removed the Thyrsistor/ignition amp from its mounting to test another but it did not start the car when turning the key. :cry:

Thinking the test unit was faulty I plugged mine back in and that did not start the car either, foolishly I had NOT screwed the units back onto the base plate as I thought they has independent earths, and when this was done they both worked, RESULT. we now had Two working Thyristors. :roll:

Had to try demist the screen later I realised the revs did not alter when the blower was turned on. :?

I have now left the blower on ALL the time when driving to see if the fault returns, well after a month its all still OK. :)

What I did to fix the problem I do not understand, all I did was unscrew the unit and then fix it back. :w

Anyone else out there wish to test theirs and report back?. :?:


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SST Ti MISFIRE, FALLING REVS

Post by reliant-reviver » Sat Aug 25, 2018 10:36 am

Thought you learned that from your previous medelling?

The coil pack mounting is independently earthed and very sensitive. If in doubt run a second earth.


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SST Ti MISFIRE, FALLING REVS

Post by philhoward » Sat Aug 25, 2018 11:53 am

I was thinking that merely disturbing and reseating it has probably found (and improved) a below-par earth?


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SST Ti MISFIRE, FALLING REVS

Post by gtcse8 » Sat Aug 25, 2018 6:26 pm

Phil, the "Medalling" WAS the finding of the fault, but only after we called you LOL.
Possibly Phil, on inspection the mounting was "As New" and shiny, the spring washers were very tight on the clamp so I don`t suspect a bad/loose earth was the problem before?.
Can someone else out there do the same to their car if they have the misfire with heater fan on?.
If no takers, then I may start "Medalling" to try replicate the fault.


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