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Spi - That Screw That Shouldn't Be Moved, Has Been...now What


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#1 Pops_Guild

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Posted 25 July 2018 - 03:47 PM

(gah - now corrected the title)

 

Hi All

 

Just spent a long weekend on the path of reassembling my JDM SPI after a 2 year long re-build and my father in law, who's been a great help all along the way, casually mentioned he tried to adjust the screw around the back of the throttle linkage to get it idling better...u-oh! He said he put it back where he found it but...

 

It runs ok but as everyone says 'don't touch it' I'm now a tad concerned as it'll have to be MOT'd soon. I don't have any diagnostics equipment, so what do I need to get/borrow in order to get it as it should be?

 

Thx

 

 


Edited by Pops_Guild, 25 July 2018 - 04:10 PM.


#2 Pops_Guild

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Posted 25 July 2018 - 03:49 PM

Attached File  that screw.jpg   48.97K   5 downloads

 

to borrow from Sprockets post in the pinned section...

 

"Do not under any circumstance adjust this screw unles you have access to a diagnostic unit that is capeble of tuning the idle speed. Idle speed cannot be set without this diagnostic. The stepper motor plunger can be seen to the left, it acts on this screw adjusting the idle speed"


Edited by Pops_Guild, 25 July 2018 - 03:49 PM.


#3 Bat

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Posted 25 July 2018 - 04:28 PM

Hi,

Well if the idle speed is stable and at the correct speed you've probably got any with it.

The only way to know for sure is an emissions test, like they do on an mot.

Cheers  :proud:



#4 Pops_Guild

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Posted 27 July 2018 - 07:56 AM

The idle is stable but high when it's warmer up, 1100rpm or so. If I rev it hard for 10secs or so it'll drop below 800rpm for a bit and sounds like it will still, but eventually settles to 1100rpm ish.

What kit would I need to get it right?

#5 Pops_Guild

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Posted 27 July 2018 - 07:56 AM

The idle is stable but high when it's warmer up, 1100rpm or so. If I rev it hard for 10secs or so it'll drop below 800rpm for a bit and sounds like it will still, but eventually settles to 1100rpm ish.

What kit would I need to get it right?

#6 Bat

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Posted 27 July 2018 - 08:02 AM

Hi,

Check the throttle cable first. With the ignition key out for 5 minutes check the linkages on the carb are all free to move.

After that you'll have to plug something into it, but I don't know what.

I know on some cars there's 2 sockets and one is for the alarm...

Cheers  :proud:



#7 Bat

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Posted 27 July 2018 - 08:28 AM

Hi,

Another question to ask, I seem to remember you had this problem before moving the screw?

Have you checked all the vacuum and breather pipes for cracks and leaks, quite a common fault...

Cheers  :proud:


Edited by Bat, 27 July 2018 - 08:29 AM.


#8 Pops_Guild

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Posted 27 July 2018 - 05:35 PM

Throttle cable, fuel trap and vac pipes all replaced well before the f-in-l dabbled. I thought it was fine before but it isn't now. I have a JDM Spi, no alarm so just one connection for analyser thing

#9 DeanP

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Posted 27 July 2018 - 06:52 PM

Are you friendly with the garage you are having the MOT done at ?

 

If there is someone there who is familiar with the set up, I'd point the screw out to whoever is testing the emissions and ask them to adjust if needed. Tell them you know it has been adjusted by a friendly not too helpful mate and act a bit frustrated to get some sympathy. Obviously there may be an additional charge for this.

 

Otherwise if they aren't familiar with the set up, you'll risk getting the old "ten days to fix it chat" and have to find somewhere to fix it anyway. Which is annoying for something that appears a simple fix with the right tools.


Edited by DeanP, 27 July 2018 - 06:54 PM.


#10 Pops_Guild

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Posted 28 July 2018 - 08:26 AM

Yeah, that might be possible...i was just hoping to remove the risk of the MOT failure (as far as you can anyway)...i assume MEMSdiag wouldn't help me? I was thinking of getting/making the cable to use that

#11 genpop

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Posted 28 July 2018 - 11:04 AM

the carburator is misset in any way , so where is the problem to turn this screw out till correct rpm is reached? For the corect O2 setting there is an other screw!



#12 Pops_Guild

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Posted 29 July 2018 - 09:27 AM

From Sprockets posts (and others) turning that screw without the diagnostics equipment being attached can mess up the ECU and the running of the car. It's not like a carb mini at all...which is why I posted for help. If this was a carb mini id be fine ?

#13 FlyingScot

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Posted 02 August 2018 - 10:10 AM

You need Testbook or a Sykes Pickavant ACR with Rover Pod 3 or above or a Crypton ACT. It’s the stop that sets the count point for the stepper which in turn bleeds air for the idle setting.
Borrow one if you can, check the pinned link

FS

#14 xrocketengineer

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Posted 03 August 2018 - 06:15 PM

In other words, you screwed with the screw, so you are now screwed?






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