Alfa GT Idle / Power issue(s)
1889
19
Did post in another thread but I've seem to have grown some more issues related to the original one. So would like some further guidance...
Car = 2006 Alfa GT 1.9JTDm, just hit 50,000. FSH. Recently had new glowplugs and a relay + oil service
Problems:
#1 - Idle would be pretty uneven and even make the car shudder very slightly
#2 - On long motorway drives there seemed to be more turbo lag below 2,000rpm or it'd stutter before the turbo wakes up and power comes on
#3 - Started up recently to drive to work, after about 200metres in first gear the power/turbo completely died, i was in first with my foot down, revs would barely climb so practically rolled 20metres with no engine (engine was on). Then it sorta went back to normal
#4 - Same day I was driving with the engine semi-fully warmed up and it'd hesitate when i put my foot down in gear, or it'd be a mini shudder before speeding up.
I dunno if it's the EGR valve that's clogged up because it's been a motorway muncher all its life, maybe the last 5,000miles its been 50/50 town and A road.
Also the turbo itself seems fine, barely any smoke, lots of power when the turbos spinning, MPG isn't too terrible either.
No warning lights on the dash either
Any guidance will be appreciated very much
Car = 2006 Alfa GT 1.9JTDm, just hit 50,000. FSH. Recently had new glowplugs and a relay + oil service
Problems:
#1 - Idle would be pretty uneven and even make the car shudder very slightly
#2 - On long motorway drives there seemed to be more turbo lag below 2,000rpm or it'd stutter before the turbo wakes up and power comes on
#3 - Started up recently to drive to work, after about 200metres in first gear the power/turbo completely died, i was in first with my foot down, revs would barely climb so practically rolled 20metres with no engine (engine was on). Then it sorta went back to normal
#4 - Same day I was driving with the engine semi-fully warmed up and it'd hesitate when i put my foot down in gear, or it'd be a mini shudder before speeding up.
I dunno if it's the EGR valve that's clogged up because it's been a motorway muncher all its life, maybe the last 5,000miles its been 50/50 town and A road.
Also the turbo itself seems fine, barely any smoke, lots of power when the turbos spinning, MPG isn't too terrible either.
No warning lights on the dash either
Any guidance will be appreciated very much
1 - 9 of 9 Posts
Joined
·
167 Posts
Don't remember seeing the metal rod thing while fitting EGR blank, so don't think it's a swirl-flap intake. which brings me onto...
Cleaned out the EGR & fitted a partial-blank to it. Made the car run a fair bit better, idle appears to be smoother, power delivery is sharper. But it's still not perfect, there's a minute delay before the turbo kicks in, and turbo-lag seems more pronounced in 3-6th at the 1400-1600RPM mark.
I've bought a new air filter and going to clean the MAF while I fit the filter. However I'm still unclear about the boost pipes location, is there a photo or are they pretty big pipes/hard to miss?
EGR blank / partial blank should be a mandatory buy for JTD owners by the way!
Cleaned out the EGR & fitted a partial-blank to it. Made the car run a fair bit better, idle appears to be smoother, power delivery is sharper. But it's still not perfect, there's a minute delay before the turbo kicks in, and turbo-lag seems more pronounced in 3-6th at the 1400-1600RPM mark.
I've bought a new air filter and going to clean the MAF while I fit the filter. However I'm still unclear about the boost pipes location, is there a photo or are they pretty big pipes/hard to miss?
EGR blank / partial blank should be a mandatory buy for JTD owners by the way!
Joined
·
167 Posts
Checked the tiny control pipes, seemed fine/nothing obvious. Checked the turbo hoses themselves. all good, only anomaly i found was some oily residue on some doodad under the nearside-rear corner of the engine cover. pic:
![]()
Seemed fresh. underneath the car there was a drop or two of the same residue on the lower turbo hose, again fresh after running the car.
Should I jsut give it to a garage or anything else I can check? Going to clean the MAF and check the panel filter now
Thanks again for your help, hugely appreciated
Seemed fresh. underneath the car there was a drop or two of the same residue on the lower turbo hose, again fresh after running the car.
Should I jsut give it to a garage or anything else I can check? Going to clean the MAF and check the panel filter now
Thanks again for your help, hugely appreciated
Joined
·
167 Posts
It's oil dripping down from something up-top, not from the hose itself. Going to disconnect/clean the MAF and see whats what. If not I'll just give it to my local alfa specialist (Waterfall Garage, Bridgend) and see what they come up with. I'll post up the issue for future reference
Joined
·
167 Posts
Thanks for the reply, yeah I think the MAF is at fault, but not completely broken. I unplugged it, car ran fine/as normal. But the symptoms weren't as severe as yours. So hopefully a blast with Carb-Cleaner will cure it. Hope yours got fixed!My '99 156 JTD 2.4 suddenly had lost all the power, I couldn't even move the car idling on first gear, and had to rev up to 2500rpm to move. The EGR was blanked..so no doubts about it.
Normally, releasing the clutch without care at idle speed, would make the car move fast and crunch the neighbour's car easily , it has a lot of torque! Now it was like if the engine was dying while releasing the clutch slowly.
The problem was the MAF. After getting a friend's MAF for testing, the car instantly got the high torque again.
Th Mechanic said that the MAF was reporting an insane air mass. He said it was reading 6.000mg of airflow instead the usual 450mg. So the ECU was injecting a lot of fuel, making the burn too rich and lossing power, and diesel!
Sadly the turbo broke up 2 days after...damn!
Sorry for my bad english. I have very poor grammar about motors even in my mother language!
Joined
·
167 Posts
Update:
Disconnected the MAF, cleaned it out with carb cleaner (used an entire spray-can till the stuff coming out of it was clean), let it dry off properly. Refitted. But no real difference...
Car has a bit more pull (st 1500-1600 rather than after 1600-1700), but still a lumpy idle, and i've noticed at startup, there's a fairly strong smell of diesel coming from the back of the car (100% exhaust outlet). Co-worker commented that it smelt very rich. It's also pretty smokey when i put my foot down, not black/blue. just grey. (doesn't use coolant/oil etc)
Safe to assume the MAF is dead?
Disconnected the MAF, cleaned it out with carb cleaner (used an entire spray-can till the stuff coming out of it was clean), let it dry off properly. Refitted. But no real difference...
Car has a bit more pull (st 1500-1600 rather than after 1600-1700), but still a lumpy idle, and i've noticed at startup, there's a fairly strong smell of diesel coming from the back of the car (100% exhaust outlet). Co-worker commented that it smelt very rich. It's also pretty smokey when i put my foot down, not black/blue. just grey. (doesn't use coolant/oil etc)
Safe to assume the MAF is dead?
1 - 9 of 9 Posts
