very uneven idle

[gavink]

Hi...

my car has just developed a problem..on idle the revs hunt up and down from 1100 to 1600 rpm constantly..

It done the same thing a week back but fixed its-self...anyone got any ideas

gavin

[kev-yorks]

You could aways try a ECU reset if your running the stock one. Disconnect battery press brake pedal for 30 secs then reconnect. If that doesn\'t cure it check for any vac leaks (easier said than  done)
Regards Kevin

[gavink]

Thankyou for the help  running an apexi ecu though..

I did look for any pipes that were off, and there are a few matal pipes that have no pipes on them but they  dont look like they ever have had a pipe conected...why did they put SO many vac pipes !!!! there\'s bloody loads   :mad:

[rx7veilside]

any pipe that is pulling air in shd not be open to atmosphere if in doubt put ur finger over the end if there is suction then it shd be attatched somewhere

[gavink]

Originally posted by rx7veilside
any pipe that is pulling air in shd not be open to atmosphere if in doubt put ur finger over the end if there is suction then it shd be attatched somewhere

Hi....


Ok today ive been trying to sort it out but im not getting anywhere...none of the hoses that are open to atmosphere either suck or blow ( )..

Ive got a commander linked to my ecu so i can check all the relevent sensors\'s voltages etc...ive disconnected the tps plug,map sensor,ecu and cleaned all contacts etc but that made no diference....
Ive check the vac pipes for leaks and they all seem ok
Checked the vac hose to the brake servo - all ok...
I really dont think it can be an air leak as the problem has happend once before but fixed its self...

Im a little stuck with this one...dont really know what to try next..any ideas ??

thanks

gavin

[rx7veilside]

apart from idle is car loosing power i am by no means an expert but uneven idle is one syptom of loosing a tip.with prob like thise pay an expert an hours labor to diagnose as many problems have multiple symptoms..where are u located

[gavink]

Originally posted by rx7veilside
apart from idle is car loosing power i am by no means an expert but uneven idle is one syptom of loosing a tip.with prob like thise pay an expert an hours labor to diagnose as many problems have multiple symptoms..where are u located

Hi there..

No no power loss and the car boost\'s fine...

Just bein doin some research and found that a faulty clutch switch can cause uneven idle - ill borrow a multimeter tomoz and check it...

If that turns out to be ok i may have to pop it to a specialist as you say...im in evesham (about 15 miles from worcs)

[jonrx7uk]

When i got my Apexi i had the same symptons.

Check the clutch switch is working using the Commander.  If it\'s not, take the clutch switch out (dead easy, 1 nut).  

The clutch switch spring can break.  I replaced mine with a ball point pen spring!

Solid idle afterwards

Cheers
Jon

[gavink]

Originally posted by jonrx7uk
When i got my Apexi i had the same symptons.

Check the clutch switch is working using the Commander.  If it\'s not, take the clutch switch out (dead easy, 1 nut).  

The clutch switch spring can break.  I replaced mine with a ball point pen spring!

Solid idle afterwards

Cheers
Jon

Just checked the operation on the commander and its seems to be switching ok...What is port air control?

[jonrx7uk]

Port Air Control is when the ACV (Air Control Valve) directs some of the Air pump air into the exhaust (at certain oerating conditions).  To check if it is working okay, pull off the long 1" pipe that comes from the ACV to the air filter (runs alongside the 2nd turbo inlet pipe).  If you can smell exhaust gas something is wrong.  Do you think this has something to do with the surging?

[gavink]

Originally posted by jonrx7uk
 Do you think this has something to do with the surging?

Maybe because on the commander it show it is switching on and off as the revs hunt...

Just took it up the road today and its a wright pig to drive..apart from the idle problem the throttle takes approx 1 second to shut off which is bloody dangerous and every time between gear changes  the revs go up approx 200rpm...

[John Yorke]

Time to get it to an expert

[jonrx7uk]

Did you wind the screw in under the inlet elbow when you fitted the PFC?  I had to do this as the idle was all over the place.  I wound it all the way in, and then back out about 1 full turn.  Took a few goes before i got it right.

The port air will switch on and off as the revs rise/fall.  Normal IIRC

Cheers
Jon

[gavink]

Thank you for the info there jonrx7uk

No i have not touched any idle screws etc as having the PFC pluged in made no difference...

Anyway last night i stripped the plenum off and have found a split in the upper intake gasket,hopefully this was what was causing the problem...

Now to my next problem...are all mazda dealers  F**king useless ?

I rang them up with the part numbers (also want an intake temp sensor as this seems to read all over the plaice) but they want the chassis number...i go find it them ring them back..nope the system dont reconice that chassis number !! well thats what it says on the v5!!...Now that was at 9.30 this morning..they were supposed to be ringing me back within an hour !! well its now just gone 5pm ffs.......Sorry rant over

Where else can i order gaskets from ? can one of the specialists from this forum help?

thanks

gavin...

[jonrx7uk]

WGT got me my last UIM gasket.  Give them a ring, they may also have a 2nd hand temp sensor.

Glad you traced the problem.

Cheers
Jon