10 replies to this topic

[gxg_romford]

Hi Everyone

 

I've just purchased on the the crypton units on ebay with the SPI lead and card, however before i start playing about i wanted to see whether anyone has any tips for using the unit, connecting it up, powering it, and reading the faults. Also do you use them with the engine running for both live data and playing with the idle

 

Mines a 95 sprite spi by the way

 

Thanks!

[FlyingScot]

Card in, red lead on starter connection. Ignition on. Then step through set up.

FS

[gxg_romford]

So i received the crypton and gave it a g9 today. So no real faults with the sensors which is ideal.
Oxygen sensor fluctuated between 550 and 250...is that normal?
The vacuum showed -440 and the book says it should be less than 41 so guess thats ok?
Says throttle switch wasnt present but guess thats because i didnt press the throttle

2 main advice questions:
When trying to set the stepper it said it wasnt working properly...do i require a new one or something else to try first?

I also tried to set the idle by moving the bypass screw but it just raised the idle and i couldnt adjust the screw. Is there a technique to this? Which way should it turn?

Thanks

[gxg_romford]

And the stepper was set at 51 steps according to live data

[FlyingScot]

So i received the crypton and gave it a g9 today. So no real faults with the sensors which is ideal.
Oxygen sensor fluctuated between 550 and 250...is that normal?
The vacuum showed -440 and the book says it should be less than 41 so guess thats ok?
Says throttle switch wasnt present but guess thats because i didnt press the throttle
2 main advice questions:
When trying to set the stepper it said it wasnt working properly...do i require a new one or something else to try first?
I also tried to set the idle by moving the bypass screw but it just raised the idle and i couldnt adjust the screw. Is there a technique to this? Which way should it turn?
Thanks

The key with the oxygen sensor is the fact it changes quickly; they slow down as they age.
I'll check about the vacuum it's different on these.
Throttle switch, depends if you have one! 1995 probably doesn't.which is why it isn't present.
DO NOT under any circumstances adjust the stepper stop screw (air bypass) until you have eliminated any air leaks and the car is at normal operating temperature.
If you tried to tune the stepper and it wasn't having it, it could be a fault so I wouldn't be making any adjustment until you know. It's not a simple adjustment in any case.

FS

[spiguy]

'95, wont have a throtle switch. The idle position is just read from the throttle potentiometer on the later cars. A better approach really, and eliminates another part which can fail. Also, on the earlier cars with the throttle switch, they fitted a return spring to the pedal to ensure the switch is made. Make the throttle pedal really heavy. I have removed the spring on mine, and occasionally need to pop my toe under the pedal to give it a little help to make the switch!

[gxg_romford]

Thanks for the replies guys

 

Hmmm i think i might have broken it. I pressed the adjust air bypass button to see whether there were any other warnings and it said lower the engine speed after increasing them to about 1500....

 

I havent tried the car since though. hopefully it will go back to normal again when i look at it next. I think i might need to invest in a new stepper though perhaps

 

If it doesnt go back to idling at 800ish rpm...any thoughts?

[gxg_romford]

The revs last night were at 1.5k when the car warmed up. Might just go for it and change the stepper and set the whole thing up again

 

What do you think?

[gxg_romford]

Hey, back again. So i replace the stepper motor after all as thought this was likely to be causing me problems. The car run fine after this idling at 600rpm and was all good for about 2 hrs of driving over the weekend. The revs however on my 4th journey were settling at 1.2k rpm so i thought it best to chec the diagnostic again and it is still saying that the stepper motor cannot be tuned as it is not working correctly.

 

So 2 questions.....

1. Can the stepper motor casing cogs fail and this is causing the stepper to not actually do anything?

2. Is it possible that resetting the ECU might be able to fix this and get the ECO to relearn the engine and settings? Are there any dangers of doing this?

 

Any help would be appreciated

 

Thank you

 

Gary

[FlyingScot]

In answer to your questions

1) yes this can happen although when you turn on the ignition the stepper should cycle from one side to the other. Removing the stepper motor and check manually that the mechanism works and check for wear before refitting.
If you have a multimeter check the coils of the stepper motor (even new parts can have a fault).
2) definitely do this; this is normal and should be done when you have changed a component.

Check you have the throttle cable correctly adjusted before doing any of this.
When the car is warmed up how many steps is the stepper at?

FS

Edited by FlyingScot, 14 October 2015 - 12:52 PM.

[gxg_romford]

Ok thanks, will try to do this over the weekend and get back to you. I think the lost motion link might be slightly low, so i will also adjust this at the same time before i do the reset

 

I have a multimeter but no idea how to actually use it and how i'd go about checking the coils, does this mean taking the stepper motor apart?

 

When i tested it with the old stepper in it showed 51 steps, but the new one was only showing 18 steps, although im not sure how accurate this would be if it says there is an issue with the stepper motor

 

Ashame as thought it was sorted until my last run out in it

 

Thanks for the quick response!