Lately i have been having problem with my car. ( 93. urs4 / aan)
its been studdering on revs, and i have to accelerate slowly to not have the car jump.
felt like it was the plugs, so i bought new ones. but it was all the same again.
even when idling i could notice missfires.
so yesterday i tested the system for airleaks. no leaks in the actual system. ( From the hose from turbo-outlet.) But i tried blowing in the hose to the wastegate. and i couldnt hear anything, but i could blow straigt trough it
. so i took off the hose, no leaks there.
tried a hose on the upper part of the wastegate. just to test the membran, and it was not leaking.
Unscrew the banjo, and found soot inside it.
took the hole wastegate off, and open it. to find it covered in soot. the air was leaking down the actual Valveshaft. and exhaust in to the wastegate.
The valve had a huge amount of axial play. you know what i mean, like in a bad turbo.
this i found out last night, and i havent tried another wastegate yet. so i dont know if it is the source to my problem. But i think it is, a leak this big, will make the wastegate close and the motor behave strange.
Made a sketch in paint, for those who dont understand what i am talking about.
i tried some copperpaste on the shaft to see if it would seal, but it was too much of a gap, and i reccon in time the paste will disappear. so now im looking for a new wastegate.
Will post results asap.
Hope i could help anyone out there who have the same problem. checking the wastegate wouldnt even strike my mind.
-Henrik
its been studdering on revs, and i have to accelerate slowly to not have the car jump.
felt like it was the plugs, so i bought new ones. but it was all the same again.
even when idling i could notice missfires.
so yesterday i tested the system for airleaks. no leaks in the actual system. ( From the hose from turbo-outlet.) But i tried blowing in the hose to the wastegate. and i couldnt hear anything, but i could blow straigt trough it
. so i took off the hose, no leaks there. tried a hose on the upper part of the wastegate. just to test the membran, and it was not leaking.
Unscrew the banjo, and found soot inside it.
took the hole wastegate off, and open it. to find it covered in soot. the air was leaking down the actual Valveshaft. and exhaust in to the wastegate.
The valve had a huge amount of axial play. you know what i mean, like in a bad turbo.
this i found out last night, and i havent tried another wastegate yet. so i dont know if it is the source to my problem. But i think it is, a leak this big, will make the wastegate close and the motor behave strange.
Made a sketch in paint, for those who dont understand what i am talking about.
i tried some copperpaste on the shaft to see if it would seal, but it was too much of a gap, and i reccon in time the paste will disappear. so now im looking for a new wastegate.
Will post results asap.
Hope i could help anyone out there who have the same problem. checking the wastegate wouldnt even strike my mind.
-Henrik
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