Help! Boost just cut off
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Help! Boost just cut off
Can anyone help. My car seems to pick up on boost then just drops right off. The turbo just starts to come in then the boost drops right off. I'm running 10psi
- owen080808
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It could be any number of things: boost leak, faulty wastegate, faulty dump valve, boost solenoid problems, incorrect/old sparkplugs/ignition components...
I assume this is an engine transplant into a clio? How does the car run when not in boost? are you using an MBC or a chipped ecu or just standard? has it recently been swapped or has it been running fine for a while and now you have problems?
Try searching the forum too, you might get some ideas from people who have had similar symptoms before...
I assume this is an engine transplant into a clio? How does the car run when not in boost? are you using an MBC or a chipped ecu or just standard? has it recently been swapped or has it been running fine for a while and now you have problems?
Try searching the forum too, you might get some ideas from people who have had similar symptoms before...
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| '92 turbo + Rich mod | Sold
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| '92 turbo + Rich mod | Sold
| '90 turbo + Seized engine | gone to the volvo dealer in the sky
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drops off on boost
bought the car off some guy, he said it was running mint then a week before i bought it the problem accurred. running a standard ecu for now anyway.
- owen080808
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JohnTurbo wrote:Should get at least 13-14 psi before the ecu interveens.
thats what i thought, i guess it could just be the gague? its hard to know when there's no mention of how the car runs the rest of the time...
Currently car-less
| '92 turbo + Rich mod | Sold
| '90 turbo + Seized engine | gone to the volvo dealer in the sky
[img]http://i32.photobucket.com/albums/d4/owen080808/480%20turbo/avatar.jpg[/img]
| '92 turbo + Rich mod | Sold
| '90 turbo + Seized engine | gone to the volvo dealer in the sky
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- JohnTurbo
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Clio person, for me to be of any help you need to be super decriptive.
The boost dropping off is too vague.
What happens exactly, does the car violently decelerate? or are you sitting there with your foot wedged to the floor on zero psi smoothly cruising along albeit with pretty piss poor acceleration?
The boost dropping off is too vague.
What happens exactly, does the car violently decelerate? or are you sitting there with your foot wedged to the floor on zero psi smoothly cruising along albeit with pretty piss poor acceleration?
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94 Turbo - Red
94 Turbo - Black (Converted from NA 2.0)
92 Turbo - Red
90 Turbo - Silver
Now:
00 Exige
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reply
once i try to accelerate the turbo will just start to boost then all of a suddern the boost will drop right off , just as the car's about to take off the boost will drop off as if its under fueling.
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- haz@nocturnal_development
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the ecu starts to retard boost at 8psi and keeps retardin. the ecu doesn't interveen at 14psi, thats when the injectors are on max cycle so will start to run lean if most boost is reached. if its the ecu boost limit bein reached then it will misfire.
if the car is goin flat then its prob got an rt pump on it, check that.
also the actuator, if std, is too weak so will spike high then drop off.
sounds like the car is std, the chap has tried to up the boost then gave up n sold it on. its always suspect when the car developes issues 'just' before a sale
if the car is goin flat then its prob got an rt pump on it, check that.
also the actuator, if std, is too weak so will spike high then drop off.
sounds like the car is std, the chap has tried to up the boost then gave up n sold it on. its always suspect when the car developes issues 'just' before a sale
reanualt 5 campus, Volvo turbo conversion, hybrid T28, -31 actautor, external oil cooler, THS intercooler, rear radiator, large throttle, Adaptronic ECU, cossie blue injectors. results recorded '06 (21 psi 228bhp/229lbs),(23psi 12.6 @108mph)
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If the car shakes when building boost its the pump,i have the same pb.Gonna change the pump tomorrow and see what's what !
Also another symptom for low fuel pressure is engine choke-up if u push the acceleration quick to the floor it,even in neutral.
Also another symptom for low fuel pressure is engine choke-up if u push the acceleration quick to the floor it,even in neutral.
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Re: reply
clio 480 turbo wrote:once i try to accelerate the turbo will just start to boost then all of a suddern the boost will drop right off , just as the car's about to take off the boost will drop off as if its under fueling.
Sounds like too low octane, or dodgy cat. Just a few of many possibilities.
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Volvo 480 1990, Vovo 855 t5