Car shudders just after startup since doing a carbon cleaning
#1
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Hey all,
I'm hoping someone on here can offer some advice. I did a carbon cleaning (using THIS guide) the other week and have run into a problem. A couple of days after I finished the cleaning I noticed that the car had trouble turning over. It would start then the RPM's would bog way down, the car would shudder a bit, then it would return to normal.
In the two weeks since the problem has gotten progressively worse. Now the car starts, but then shudders for a minute or so of revving before finally returning to normal. When this ends it runs butter smooth and I have no more issues.
The problem only seems to occur when the car gets hot sitting outside. On colder mornings it fires up without a problem. I'd thought maybe I didn't hook a fuel line up tightly enough or something so took the upper intake off again and disconnected/reconnected the fuel rails again and reassembled everything. Unfortunately this made no difference.
I would appreciate any help if finding the mistake that I made.
I'm hoping someone on here can offer some advice. I did a carbon cleaning (using THIS guide) the other week and have run into a problem. A couple of days after I finished the cleaning I noticed that the car had trouble turning over. It would start then the RPM's would bog way down, the car would shudder a bit, then it would return to normal.
In the two weeks since the problem has gotten progressively worse. Now the car starts, but then shudders for a minute or so of revving before finally returning to normal. When this ends it runs butter smooth and I have no more issues.
The problem only seems to occur when the car gets hot sitting outside. On colder mornings it fires up without a problem. I'd thought maybe I didn't hook a fuel line up tightly enough or something so took the upper intake off again and disconnected/reconnected the fuel rails again and reassembled everything. Unfortunately this made no difference.
I would appreciate any help if finding the mistake that I made.
#6
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Hey all,
I'm hoping someone on here can offer some advice. I did a carbon cleaning (using THIS guide) the other week and have run into a problem. A couple of days after I finished the cleaning I noticed that the car had trouble turning over. It would start then the RPM's would bog way down, the car would shudder a bit, then it would return to normal.
In the two weeks since the problem has gotten progressively worse. Now the car starts, but then shudders for a minute or so of revving before finally returning to normal. When this ends it runs butter smooth and I have no more issues.
The problem only seems to occur when the car gets hot sitting outside. On colder mornings it fires up without a problem. I'd thought maybe I didn't hook a fuel line up tightly enough or something so took the upper intake off again and disconnected/reconnected the fuel rails again and reassembled everything. Unfortunately this made no difference.
I would appreciate any help if finding the mistake that I made.
I'm hoping someone on here can offer some advice. I did a carbon cleaning (using THIS guide) the other week and have run into a problem. A couple of days after I finished the cleaning I noticed that the car had trouble turning over. It would start then the RPM's would bog way down, the car would shudder a bit, then it would return to normal.
In the two weeks since the problem has gotten progressively worse. Now the car starts, but then shudders for a minute or so of revving before finally returning to normal. When this ends it runs butter smooth and I have no more issues.
The problem only seems to occur when the car gets hot sitting outside. On colder mornings it fires up without a problem. I'd thought maybe I didn't hook a fuel line up tightly enough or something so took the upper intake off again and disconnected/reconnected the fuel rails again and reassembled everything. Unfortunately this made no difference.
I would appreciate any help if finding the mistake that I made.
if yes, sometimes a reused coil can be the issue due to fitting inside
#7
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+1 to what Roy said.. Get a Vcds scan!
Could be a bad coil.. Will show up in scan.. Audi have lots of issues with earlier coils..
Could be a bad coil.. Will show up in scan.. Audi have lots of issues with earlier coils..
Last edited by hrc4u; 05-21-2015 at 12:51 PM.
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#8
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Not sure what engine you have, but I wonder if an idle air control valve is sticking perhaps?
Surging idle would point to a sticky control, whether thats a IAC valve or throttle butterfly, I'm not sure.
But if its missing and not firing on all cylinders, that would point to a plug or coil.
Surging idle would point to a sticky control, whether thats a IAC valve or throttle butterfly, I'm not sure.
But if its missing and not firing on all cylinders, that would point to a plug or coil.
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