car not holding boost?

[gooner8]

car seems to be playing up! When on full boost it keep holding back and banging? Thinking maybe spark plug gaps? Want is the gap for an evo 4? Thanks

 

[gooner8]

also seem's to do it more in higher gear's 4th 5th etc.

 

[evoaps]

Coil packs or plugs maybe actuator

 

[Dirtmatt]

Plugs of leads would be a good place to start, if they are failing will cause it to miss on full boost..

Unless its over boosting? Fuel cut does the same thing

 

[gooner8]

wouldn't say over boosting under if anything! Was mapped to 1.3 bar and it hit that and drop's .1 .2 of a bar and bangs like launch control but at 60 mph? Cheers for the reply's any one know the gap size?

 

[B6lee]

0.7mm should do you
But to be honest I'd be looking for possible split or loose vaccine pipe if it's happened all of a sudden

 

[gooner8]

0.7mm should do you
But to be honest I'd be looking for possible split or loose vaccine pipe if it's happened all of a sudden

yeah i did think that mate slit or a chauf but cant see anything? Where would be good to look if your thinking of anywhere? Maybe i'll have to look under it some how, cant see anything from the top! Cheers

 

[RsvRob]

Gap to 0.55
If it's on full boost and above 60mph I'd say plugs or packs.
Had someone mapped to 1.8. He changed plugs on service and got the same, pops bangs on full boost. He'd forgot to gap correctly and wasnt getting full spark

 

[gooner8]

Cheers rob i'll give it a go.

 

[gooner8]

sorry been busy what i wanted to say is, i went out last night the temp was down by 10 c @ 19 and it seemed ok?? Could it be the heat? Cheers

 

[m7gsr]

I'd say pluigs, had a similar issue on an 8

 

[gooner8]

will whip them out tomor and have a look. Hopefully be a nice easy fix?

 

[gooner8]

want size are the spark plugs? 17 mm? Do i do 0.7 mm grab or 0.5.5 mm? Thanks

 

[And@fcm]

Gap at 0.55 if your running cop then you can run 0.7

 

[gooner8]

what's cop and? Took them out 3 were at 0.7 and one at 0.6, set them all the same went for a drive and it seem's ok, will turn the boost back up after the gp and test again. Thanks

 

[Evo8Frankie]

cop means copper plugs, as the gaps need to be smaller than the gaps need to be on iridium plugs mate.

 

[gooner8]

cool cheer's

 

[sponners]

COP means 'coil on plug'

<----- see my avatar

 

[gooner8]

COP means 'coil on plug'

<----- see my avatar

nice one Cheers. No just std e4 with the 2 pack's.

 

[And@fcm]

Yeah cop ment coil on plug. 0.7is too big really for standard packs. What did you gap them too