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Rough Idle / Start Up (96 Spi)


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#1 MarkC123

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Posted 13 March 2019 - 01:10 PM

Hi guys,

I’ve been trawling through the forums for similar problems but still can’t seem to find the solution.

After I start up my 96 spi mini and drive it straight away, I notice that sometimes when I go to clutch in, in 1st gear, the revs drop off and it sounds as if the car is about to stall (and sometimes does) but usually it picks back up again to normal revs.

Then for the first couple minutes it seems as if there is a power lag, as in, I put the foot down and it’s as if the power is only going on 70% before it sorts itself out. Sometimes when the cars in a low gear such as 2nd while this “lag” is happening it’s as if the car is shuddering.

Only happens when I start up and never when the engines warm. Fuel lines seem to be ok and it has been to mini garage who can’t seem to find any issue.

Thanks in advance, mark

#2 Bobbins

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Posted 13 March 2019 - 02:14 PM

If you haven't already you should renew the 4 vacuum hoses and fuel trap.



#3 humph

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Posted 14 March 2019 - 01:22 PM

Have a read of this pinned thread, it's invaluable when having spi problems.

 

http://www.theminifo...oint-injection/

 

You need to find someone with a code reader. I bought one cheap few years ago and it's a must, but I recently bought one of these leads off ebay and it's been great.

 

https://www.ebay.co....3ffe99260|iid:1

 

 

Start with investigation, then if nothing found replace the cheaper parts rather than piling in and blindly replacing expensive bits.

 

I've had similar failure to idle & cutting out issues on a number of occasions and they've usually been down to the coolant temp sensor or the lambda senor, or more importantly broken wires in the electrical feeds to them. If the code reader points to sensors make sure you do electrical checks to make sure they are getting power.



#4 viz139

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Posted 14 March 2019 - 10:55 PM

I had a similar problem, it was the vacuum hoses



#5 Screwdriver

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Posted 16 March 2019 - 12:54 PM

I suffered the same. Did the following 5 inexpensive steps in this precise order and the car idles smoother than most Minis when they were new:

 

1)  Replace ALL vacuum hoses & fuel trap

2)  Replace ground wiring

3)  Replace plugs with the correct NGK plugs

4)  Run Chevron Techron Fuel Additive (half bottle per tankful consecutively)

5)  Run Auto-Rx engine oil additive over 3K miles per instructions






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