got a cheapo micra k11, when trying to hold the speed at say 20 or 30, its like a constant jerkyness, its doing my nut in, its like your going up and down with the throttle...

anyone know what causes this and what to look at, air filter looks clean , spark plugs look ok etc ive cleaned the throttle body out, wiped it etc etc..its a throttle with cable engine if that helps, would ask on the micra website i joined, but useless on there.

cheers

 

Is it fuel injection or an old carb?

It's a fuelling issue either way.

 

Have a spray around the inlet manifold carb/throttle body with brake cleaner. The rpm might alter if there's an air leak somewhere also, if it's got a dizzy cap might be worth having a peek in there too. Hope this helps

 

its this engine, if it helps,



also not sure if its related, probably is, but when cold the idle speed is mega low, like its gonna conk out, but idles fine when warmed up..

i have cleaned the idle valve and air flow sensor thing, but didnt make any difference..

 

Looks like a single point injection thing, might have low fuel pressure (filter blocked, fuel pump fked)

As Adder says, check for air leaks.

 

The throttle bodies go fucked on these and cause al manner of shit running.

 

oh right, well it is at 140,000 miles and was woman`d for about 10 years before i got it..

 

Early signs of Parkinson's

 

I'm guessing probably not but does it have an air flow meter?

 

er its got an air flow sensor thingy, is that the same thing?., i took it out and cleaned it with some air flow sensor cleaner.

 

I had similar with an old Mondeo a few years ago, unplugged the air flow meter and it ran much better. Put a new air flow meter on and all was well again!

 

was looking at it before, and if i unplug the idle valve, the idle speed revs dont change at all, dos that mean its fooked, plugging the connector in and out and when running and no change what so ever in the low idle speed.

 

Was the engine up to temp as AFAIK a lot of cars don't use/need the iscv when warm.

 

no it was from cold as i unplugged it, as it nearly conks out when cold, if you rev it then take your foot off sometimes it conks out..

 

Dont know if anyone knows this before i scrap the fooker...

just put a new idle valve and mass air flow sensor on the car, yay i thought, the stupid low idle speed has gone, but now got a new problem...

idles fine for about 4-5 minutes, then goes into a methodic up down, up down, up down revving....on its own

wtf
my old idle valve was seized solid, and made the car car almost conking out, thats now gone, now the stupid up down idle revving thing.

 

Italian tune up...




Thrash the cunt and bang it off the limiter a few times. Lol.

 

Lol my favourite saying

 

Try disconnecting the battery for a few minutes then take it for a good run out giving it all styles if driving.

 

Yesbit probably just needs to relearn. If not it may have an air leak.

 

You have probably spent more on parts already than a 140,000 mile Micra is worth !! Depends how much the car means to you as to how much more you do to it.

 

it`s only cost 10 quid for an idle valve, and Ł20 for the air flow sensor...both new aswell, so not too bad

i have tried spraying stuff all around the inlet to see if it changed revs etc, nope..

also i did take the battery off before then went out for a bit, thrashed it a few times, nearly got 60 mph in 2nd gear in a 1.0 micra..fook me..ha..poor thing..

also it did seem to settle down on the revs, but leaving it now till the morning to see if it starts reving up and down..

pissing cars...

thanks guys for all the suggestions and help, micra site i joined was useless..

 

That's because the Micra site was full of pensioners

Hope it gets sorted mate