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1998 Mpi Running Issues After Restoration


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#211 leepol83

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Posted 16 January 2021 - 06:32 PM

Ok so got the inlet manifold back and fitted, it’s better ticking over abit low and struggling to get the steps down, assuming I need to drive it abit then Have another play?
but certainly better!, I wasn’t getting any steps last time.
On the stepper numbers is the higher the number the stepper more open allowing more air in ?
Thanks attached a video :-
https://youtu.be/zNgFCiiecK8

Edited by leepol83, 16 January 2021 - 06:33 PM.


#212 leepol83

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Posted 16 January 2021 - 10:15 PM

Can anyone tell me what the service reset function is on the Sykes pickavent ACR and if this would possibly help me ?
Thank you

Edited by leepol83, 16 January 2021 - 10:16 PM.


#213 leepol83

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Posted 17 January 2021 - 06:34 PM

Any thought on this I’m almost there thank god 😂😂 thanks guys!!!!

#214 Tones61

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Posted 17 January 2021 - 08:51 PM

Disconnect battery for 20 mins,
Then get ready for a decent run about 20-30 mins city driving for the ecu to relearn

#215 leepol83

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Posted 17 January 2021 - 09:30 PM

Disconnect battery for 20 mins,
Then get ready for a decent run about 20-30 mins city driving for the ecu to relearn


Brilliant thanks 🙏

#216 leepol83

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Posted 18 January 2021 - 05:31 PM

Hi
On the stepper is the higher the number the more air in
Or vice versa , just trying to learn abit more on this ?
When I’m adjusting the throttle screw which way to get steps Down ?
Thanks

#217 FlyingScot

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Posted 18 January 2021 - 11:15 PM

Can anyone tell me what the service reset function is on the Sykes pickavent ACR and if this would possibly help me ?
Thank you

Resets the internal clock and the learned adaptions. Do this 

 

FS



#218 FlyingScot

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Posted 18 January 2021 - 11:16 PM

Disconnect battery for 20 mins,
Then get ready for a decent run about 20-30 mins city driving for the ecu to relearn

Nope doesn’t do a reset of learned adaptions. That’s why Rover dealers used the T4, can only be done with diagnostic gear as the memory is non volatile.

 

FS



#219 pete l

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Posted 19 January 2021 - 09:46 AM

I think you're there, my steps are around 20 / 25 so you're fixed I reckon.



#220 leepol83

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Posted 21 January 2021 - 10:06 PM

Just checking It was mentioned about resetting the IACV once warmed up to temperature, so if you’re fitting a new one assuming you just turn the car on and leave it to warm up then turn it off, ignition on second click throttle up/down 5 times after 20 seconds ignition off then back on and start it, this will set the IACV to within range ????
There’s a lot of mixed opinions on the resetting the valve some say it’s a myth ?
Just curious 🤨
Thank you

#221 pete l

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Posted 22 January 2021 - 10:01 AM

I can tell you it's not a myth on the MG ZR, so I would say the same for the MPI.

 

My IACV valve on my ZR was incorrectly set and the engine would rev up and down on it's own at idle. The reset stopped it, and it lasted a couple of weeks before reving up and down again. Each reset stopped it.

 

I then got my T4 and set it up correctly.



#222 tmsmini

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Posted 22 January 2021 - 04:58 PM

There is an ongoing problem with the terminology used to describe the functions of the MEMS 2J.

I am no expert, but information is available in the Haynes manual on Engine Management and Fuel Injection. It has a section on MEMS and although it covers the entire MEMS range, it can be used to understand its functions.

 

When the ignition is turned off the stepper(IACV) is moved to the fully closed postion, then moved to a postion where the throttle plate is slightly open, ready for the next engine start. This happens no matter how long the key is on/off and without regard to pressing the throttle. Resetting the stepper so that it is in range, requires the use of the scan tool(FCR), T4, ACR or other tool. The adaptive idle measurements are retained in non-volatile memory and cannot be lost - even if the vehicle battery is removed.

 

I don't think there is a standard usage for the term indexing and resetting as it is not really defined in any of the manuals.

 

Use the tool to check the status of the steps and readjust only if necessary. In one of the sections of the Rover documentation, it indicates that a value of 20-40 is acceptable. The ACR adjusts this to a tighter specification.



#223 leepol83

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Posted 22 January 2021 - 05:07 PM

There is an ongoing problem with the terminology used to describe the functions of the MEMS 2J.
I am no expert, but information is available in the Haynes manual on Engine Management and Fuel Injection. It has a section on MEMS and although it covers the entire MEMS range, it can be used to understand its functions.

When the ignition is turned off the stepper(IACV) is moved to the fully closed postion, then moved to a postion where the throttle plate is slightly open, ready for the next engine start. This happens no matter how long the key is on/off and without regard to pressing the throttle. Resetting the stepper so that it is in range, requires the use of the scan tool(FCR), T4, ACR or other tool. The adaptive idle measurements are retained in non-volatile memory and cannot be lost - even if the vehicle battery is removed.

I don't think there is a standard usage for the term indexing and resetting as it is not really defined in any of the manuals.

Use the tool to check the status of the steps and readjust only if necessary. In one of the sections of the Rover documentation, it indicates that a value of 20-40 is acceptable. The ACR adjusts this to a tighter specification.


That’s brilliant that’s answered a lot of questions there, the ACR I’m using says between 16-20 I believe on the steps, but from what you’re saying it can be more, with regards to the position of the IACV the higher the numbers the more it’s close so 80 closed 0 fully open Is that correct ?

#224 leepol83

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Posted 24 January 2021 - 11:28 AM

Ok so I’ve recieved a replacement IACV from Minispares which I’ll fit I think, any tips on fitting it without messing up where I’ve gotten too!
Can someone confirm on the steps higher the number more closed it is ? Or vice versa ?

Cheers all
Lee

Edited by leepol83, 27 January 2021 - 06:01 PM.





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