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engine rough on idle - 4.5l cruiser pertol/gas
Posted: Tue Jun 19, 2007 4:42 pm
by faded gxl
gday lads,
i recently aquired a 94 cruiser 4.5l pertol/gas, auto.
when i start her up she idles fine but after she warms up a bit start idling ruff and the revs drop from about 750-1000rpm to 250 - 500rpm but drives fine... ?
any ideas????? economy's through the roof also
Posted: Fri Jun 22, 2007 11:41 pm
by dogoff
Check The basics that go wrong with gas/fuel cars
Valve clearences
blocked injectors
Air leaks in the intake system
Does it run ok on gas??
Posted: Sat Jun 23, 2007 7:46 am
by carts
Is it running bad on gas or petrol or both?
Posted: Mon Jun 25, 2007 11:46 am
by faded gxl
yes,its both gas and petrol... i did the plugs and air filter but they didn't seem to make a difference.
Posted: Mon Jun 25, 2007 12:13 pm
by dow50r
were any of the plugs a different colour to the others? does it crank funny? your probably looking at an air leak in the intake, however, if you havnt checked your valve clearances in the last 40000kms, do so now...straight away....b4 the head has to come off....
Posted: Mon Jun 25, 2007 1:17 pm
by faded gxl
havent had the car for 40,000kms yet so no, i havent checked the valve clearance yet... will do tho, plugs werent that bad, all were the same colour,cranks over fine... is there any specific spot in the intake tht is prone to air leaks or is that something i'l just have to have a close look at???
Posted: Mon Jun 25, 2007 2:55 pm
by dow50r
faded gxl wrote:havent had the car for 40,000kms yet so no, i havent checked the valve clearance yet... will do tho, plugs werent that bad, all were the same colour,cranks over fine... is there any specific spot in the intake tht is prone to air leaks or is that something i'l just have to have a close look at???
the bellows that are infront of the throttle body split underneath....results in lean mix when hot....good news all plugs looked thesame
Posted: Tue Jun 26, 2007 2:55 pm
by faded gxl
just out of curiosity.... what would it mean if the plugs were different colours???
Posted: Tue Jun 26, 2007 9:49 pm
by PGS 4WD
Exhaust valves will be tight no doubt. Set then above the spec of .25 to .35 set them at .40mm as LPG burns hotter the valve grows more and effectivly becomes tight, the valve dosent spend sufficient time on the seat where the heat from the valve is dissapated to the valve seat. Valve and seat failure will occur if the clearance isnt maintained.
Joel
Posted: Wed Jun 27, 2007 1:33 pm
by faded gxl
thanks for the info guys
Daniel[/img]
Posted: Sun Jul 01, 2007 2:47 pm
by dinos4x4
my mate had the same problem on his 80 petrol/lpg , the cause was that the intake pipe from the air cleaner to the throttle body was split.
he had his 80 back to the gas dude about 4 times and the clowns did not pick it up