156 JTD Mjet turbo/rpm - Alfa Romeo Forum
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156 JTD Mjet turbo/rpm

Hi All,

Just a quick question: got a 156 1.9 JTD mjet last week, my first turbo diesel. It feels sluggish up to 2500rpm the last couple of days, until the turbo kicks in, obviously...! What rpm should the turbo be coming in at, I drove a 115bhp JTD loaner and the turbo was coming in at approx 1500rpm?? Surely my MAF meter can't be giving trouble after less than 1000km??!!

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Re: 156 JTD Mjet turbo/rpm

If it's low mileage it might just still be tight. My car has no lag to speak of and was only slightly laggy when I got it (at 7,000 miles). It really only fully loosened up at around 15,000 miles. Mind you, mine is a 2.4, so I don't know if that makes a difference.
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Re: 156 JTD Mjet turbo/rpm

isnt it to do with 8v and 16v engine characteristics 8v engines produce torque lower in rev range than16v
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Re: 156 JTD Mjet turbo/rpm

My 2.4 JTD 10v (2000) kicks in at 1500rpm, your engine will need to loosen up but shouldn't take till 2500rpm to come alive.
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Re: 156 JTD Mjet turbo/rpm

my 2.4jtd was also sluggish up to 2000rpm then went like hell.
i fixed the problem with taking off the egr valve and cleaning it.
take the cover off the engine and you will find it at the back right hand side of the intake chamber.
remove the wiring connector then the 4 allen bolts. on the part left on the car poke out the hard carbon deposits around the outside of the valve plate.
then with a pair of pliers twist rod in the middle left and right and in and out while still removing the carbon.
keep doing this untill the valve plate moves in and out freely with finger pressure. give it a good blow out and replace all the parts.
the results are amazing its like driving a completly different car.
hope this help all with the same problem
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