5 replies to this topic

[GBreeze]

Sorry Guys just getting used to the site.

Posted this message elsewhere also, ut i am desperate for....

Help !

I am curently re-building a 1996 Rover Mini Sprite (with a bit of help and lots of my Money being thrown in)

Anxiously Came to start it yesterday for the first time without any joy, Engine whizzes around, but wont fire as if
no Fuel getting thro although you could hear the fuel pump and smell fuel.

Tried an experiment and tipped a little fuel in through the top of the throttle body while turning the engine over
and she burst into (ot Flames )but life.

She was running like a dream, better than iv'e ever heard her.Turned ign off to see if she'd start on her
own and by golly first time. Thought i'd cracked it.

This morning wouldnt start.

Any Ideas ?????????

[taffy1967]

Check Spark Plugs and set their gaps, check HT Leads, Dizzy Cap & Rotor Arm.

If these items haven't been changed in ages, then replace them now.

[GBreeze]

Check Spark Plugs and set their gaps, check HT Leads, Dizzy Cap & Rotor Arm.

If these items haven't been changed in ages, then replace them now.

Thanks for tip, Spark plugs are new, didn't check gap assumed pre-set ?
Why will it run so smooth once iget it running if these are the probs ?

[taffy1967]

Well the spark plug gap could prevent it firing up and it's a start I guess?

[GBreeze]

Just a thought, underneath the Air Filter housing to the rear and right hand side as looking from the front,
There is an adjustment screw, connected to the throttle linkage, i took this to be the idle adjustment screw
is this correct, as i have removed it to clean it up and replaced, not necassarily in the same position.

Am i correct in assuming it is an idle adjusting screw, would this affect it starting if incorrectly positioned ?
Still can't get into this old brain, why she fires up if i pour a little petrol into the throttle body first ?

[elvisthepizzaman]

You need to read the pinned topic at the top of the page that refers to spi problems. http://www.gaima.co....r/RoverMEMS.pdf Read this and understand how the system functions and to also understand what I posted below.

Quoting Sprocket:
Adjusting the throttle cable is not as simple as it is for the carb engines, and certain procedures must be followed for it to be correct. This some times known as Indexing the Throttle.

To check if the throttle cable is adjusted correctly the IAC (Idle Air Control) stepper motor needs to be 'set'. This is achieved by turning the ignition to on but do not start the engine, then operate the throttle linkage to full open throttle. Do not use the throttle pedal as this will not work.

Operate this linkage and not the pedal

This sets the stepper motor to the correct position to allow you to adjust the cable.

Adjust the cable here using two 13mm spanners

To achieve equal spacing on what is called the lost motion link( middle prong centralised between the other two prongs)

Do not under any circumstance adjust this screw unless 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

Once the cable has been adjusted the ignition can now be turned off.

Here is the connector for the IAC stepper motor

Idle speed can only be set using a diagnostic like the Crypton ACT. it will tune the stepper and tell you to adjust the idle speed screw so that the stepper motor is in the correct place at idle speed. The ECU then modulates the stepper motor to achieve 850rpm.

Problems arise when this idle speed screw has been adjusted without the diagnostic causing in worst cases the stepper to be eaither at zero steps and unable to lower idle speed or full steps and unable to increase idle speed.

A diagnostic check is the only way to check the tune of the IAC stepper motor and idle speed. Stepper motors do fail. There are four coils in the stepper motor and five pins on the connector. If one of these coils fail then the ECU will not be able to control the idle speed correctly. These as far as I am aware are available as a seperate part from Rover dealers, but then there are not many of these left.