Low Revs Misfire On Turbo Engine

[dave205 19]

As above really, i seem to have a misfire at low revs on my turbo engine, strangely though it clears after 2-2.5k revs and pulls fine. Other than replacing the obvious plugs and leads as a start, what else should i look for?!

 

Any suggestions on whats plugs and leads to go for?

Edited June 11, 2012 by dave205

[welshpug 1,657]

Standard plugs and leads work just fine, you'll find most on here use NGK's, as that's what most motorfactors stock, they are cheap and reliable.

 

 

as for the cause of the misfire, whip the plugs out and check the condition.

[dave205 19]

I'll get on to my local motor factors for some plugs and leads then. What sort of think should i be looking for on the plugs? Burnt, correded, fuel soaked all those sort of things?

[dave205 19]

Also, could this be anything different as it pulls fine at higher revs, it just judders and is hessitant at low revs.

[pugmarshall 4 1 Cars]

Crank sensor?

[dave205 19]

Crank sensor?

 

Anyway of testing it?

[dave205 19]

Took the plugs out tonight, its running very rich, so my next questions are, what controls air fuel mixture on these turbo engines and has anybody had any ideas what could be wrong?

 

Really want to get this sorted so i can bring it to pugfest :/

 

Cheers

[welshpug 1,657]

lambda sensor, ecu coolant temperature sensor, throttle position sensor, inlet air temperature sensor.

[dave205 19]

lambda sensor, ecu coolant temperature sensor, throttle position sensor, inlet air temperature sensor.

 

Anyway of testing any of these?

[welshpug 1,657]

yup, of course.

[luke1987 5]

Is yours VSS wired up correctly? I used to suffer from this when it wasnt connected, if you need the diagrams from autodata for testing let me know.

[dave205 19]

yup, of course.

 

Ok, care to divulge?!

[dave205 19]

Is yours VSS wired up correctly? I used to suffer from this when it wasnt connected, if you need the diagrams from autodata for testing let me know.

 

I think it is, can you email me the diagrams if i pm you my email address? I can then check it and hopefully cross that of the list of maybe's.

 

[pugmarshall 4 1 Cars]

I'll see if my boss will let me use the diagnostics some time this week and pop over if you like? You can test crank sensor with a multi meter mate and usually you can clean them up but they're not too expensive either way.

[dave205 19]

I'll see if my boss will let me use the diagnostics some time this week and pop over if you like? You can test crank sensor with a multi meter mate and usually you can clean them up but they're not too expensive either way.

 

That would be awesome if i could, ive still got your number i think. I'll drop you a text?

 

[dave205 19]

lambda sensor, ecu coolant temperature sensor, throttle position sensor, inlet air temperature sensor.

 

Ive checked some of these earlier by testing the pins on the plugs to see if they go down to earth or are live, what do i need to look for?

[dave205 19]

Quick update on this, ive fitted new plugs,leads and changed the coil pack and its made no difference at all

[jonnyturbo 3]

is it undriveable? mine starts up fine and idles fine then when the revs drop down to normal mine starts missfiring. changed every sensor possible for new and still cant get mine running right.

[dave205 19]

is it undriveable? mine starts up fine and idles fine then when the revs drop down to normal mine starts missfiring. changed every sensor possible for new and still cant get mine running right.

 

Well its utterly s*it until it comes on boost. What camshaft you running?

[jonnyturbo 3]

the dkz cam, everything on the engines been changed bar the bottom end on mine but i have the problem which iv made a post about, i have spares of most sensors and have about 4 icvs so tell me what you need and i can try get it sent out to you this week to test on your car if you wish.

[dave205 19]

Sorry for slow reply, thats great, can i try the ecu temp first?

 

[dave205 19]

Changed the fuel pump last night, made no difference!

 

The misfire definatly gets warm when hot though.