Bad Idle Bf Turbo

[jonn]

hi, ive got a problem with my idle.

once warmed up the car vibrates. stronger then usual, and only at idle.

no idea what it could be,

ive had it looked at by my tuner and the cars idle a/r are perfect, sits on 650-710rpm consistant

giving it accelerator to 800rpm the vibrating stops

if im rolling in neutral it doesnt feel to be vibrating

theres no surging, backfire, accelerates normal.

the sparkplugs are only 20,000 kms old and ive checked all the gaps

its not a vacuum leak

ive cleaned out the TB and the gasket is fine.

changed the oil

engine mounts look to be in place

anything im missing? doing my head in

[spoolxr6]

Cracked coil maybe?

[SuckSqueezeBangBlow]

Would a bad coil cause issues throughout the rev range and when on load would be obvious?

Mine has a miss I'm trying to suss at the moment.

[hawlass]

If you have a timing light, try it on each coil. Sometimes these things seem fine, but under load they crap out. Could be a dud plug, same reasons. If you kept the old plugs/coils,just swap em 1 by 1 till it stops.

[jonn]

yeh under load its smooth and pulls as hard as ever, when on idle.. its crap.

might aswell put the old ford plugs back in and see if it makes a difference.

cars.... such a waste of time lol