4jg2t problems

[dryalls]

Hey guys,

I recently bought a 93 bighorn with a 4jg2t engine (has 220,000 kms, supposidly recond at 160,000kms but yet to confirm) that had been overheated and blown the turbo cooling hose off, but not seized, it had a suspected blown headgasket which i have yet to confirm.

First thing i noticed was the radiator was clogged so have had that dealt to, guy at the shop said it was 80% blocked so theres why it overheated(hopfully).

now it seems to be lacking in top end power, doesnt hold revs or speed on hills like it should.
makes a dry whining sound around 2500rpm and above, Turbo?
when i open the oil cap when engine is running it fumes.

heres the wierdest part when i dont have the EGR (exhaust gas recirculation on top of the intake manifold) vacum diaphams connected no smoke what so ever comes out of the exhaust, when i connect the vacum hoses back up it is rough on acceleration from stationary, blows blue,black and white smoke.

Would anybody like to shed some light on this situation???

I am guessing its more than one problem but unsure.

will be checking compressions this week and will post the results.

any help will be much appriciated

Cheers
Dan

[Captcol]

when you disconnect the egr vaccum pipes do you block them or let them suck air?

[dryalls]

yes i block them, i put them back onto itself.

[geeves]

remove the egr valves and seal the holes. Check this is allowed where you live first.
Some fumes are not uncommon on an isuzu diesel. If they are too bad a catch can will reduce oil use. A compression test will tell the true state of the engine. Its not wise to overheat that engine. It cracks heads and can crack liners

[dryalls]

yeah was like that when i got it, just wierd that it makes it smoke more.

compressions are as follows:
1-442
2-450
3-450
4-400

theres a problem with number 4 cylinder, i put oil in the cylinder and compression rose to 420 but st this stage i'm thinking valves or cracked head.

head will be coming off and i will report my findings.

[dryalls]

turns out to be a blown head gasket and cracked head