Shaking and idling hard
06-23-2019, 04:52 AM
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Shaking and idling hard
Hi I’m from Australia, I have a 2013 A4, it started idling and shaking hard when I’m in traffic moving slowly or reverse parking, also idles when I started the car sometimes, it even idles like it’d almost stall when I drive around 30 km/h or so, it did stall once completely when I took my foot of brake and started to move at traffic, however, there is no code shows up but did find oil in one of of spark plugs. I really did not want to spend thousands to fix something i could’ve done it cheaper. Any suggestions is very appreciated! Thanks so much!
06-23-2019, 04:06 PM
#2
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I would start with the PCV Valve, search forum for that. It is not hard or expensive to replace, and can cause those symptoms, among many other things no doubt, but a likely suspect. Gl.
06-23-2019, 04:25 PM
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Thank you
Thanks! I am going to get a new pcv valve today and hopefully it is the problem! Thank you! Just another wick question, so the oil in one of the spark plugs would fit the problem that’s caused by pcv valve as well?
06-23-2019, 05:34 PM
#4
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Oil , what oil. You didn't mention any oil so is it in the spark plug hole or is it on the plug tip when you remove it. If it's oil in the plug hole it might be a cam cover gasket. So where is it.
06-23-2019, 07:03 PM
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06-23-2019, 07:16 PM
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PCV would have lots of DTCs popped, particularly misfires. Though that was the first thing I thought of from your problem description. What are you using to pull DTCs from the system?
When I had such a problem with an old car, it turned out to be a hole in the intake path between the MAF and throttle body. The flex tube along the way developed a crack at one of the flex seams.
In both cases, the problem was a lack of control of the intake air path between the MAF and the intake valves.
If you pull the cap out of the oil dipstick tube, change in idle? If you pull the tube from the PCV to the intake manifold off at one end and block both openings, change in idle?
Of course, it could be other things. Weak components in the spark path (coils/plugs). I don't know enough to know if the spark is stronger during higher loads, or if it's always the same current blast, to know if contamination such as oil could create weakness during low load.
Still, no misfires, would assume something common to all four cylinders, not to just one.
Could be clogging or another problem with the fuel delivery. Injectors, pump, etc. Without DTCs, you pretty much end up chasing down the mechanical operation of everything involved with creating combustion.
Or working through the real-time engine data to see what's not normal. But you don't have a normal engine anymore to contrast the measurements to.
When I had such a problem with an old car, it turned out to be a hole in the intake path between the MAF and throttle body. The flex tube along the way developed a crack at one of the flex seams.
In both cases, the problem was a lack of control of the intake air path between the MAF and the intake valves.
If you pull the cap out of the oil dipstick tube, change in idle? If you pull the tube from the PCV to the intake manifold off at one end and block both openings, change in idle?
Of course, it could be other things. Weak components in the spark path (coils/plugs). I don't know enough to know if the spark is stronger during higher loads, or if it's always the same current blast, to know if contamination such as oil could create weakness during low load.
Still, no misfires, would assume something common to all four cylinders, not to just one.
Could be clogging or another problem with the fuel delivery. Injectors, pump, etc. Without DTCs, you pretty much end up chasing down the mechanical operation of everything involved with creating combustion.
Or working through the real-time engine data to see what's not normal. But you don't have a normal engine anymore to contrast the measurements to.
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06-23-2019, 07:59 PM
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PCV would have lots of DTCs popped, particularly misfires. Though that was the first thing I thought of from your problem description. What are you using to pull DTCs from the system?
When I had such a problem with an old car, it turned out to be a hole in the intake path between the MAF and throttle body. The flex tube along the way developed a crack at one of the flex seams.
In both cases, the problem was a lack of control of the intake air path between the MAF and the intake valves.
If you pull the cap out of the oil dipstick tube, change in idle? If you pull the tube from the PCV to the intake manifold off at one end and block both openings, change in idle?
Of course, it could be other things. Weak components in the spark path (coils/plugs). I don't know enough to know if the spark is stronger during higher loads, or if it's always the same current blast, to know if contamination such as oil could create weakness during low load.
Still, no misfires, would assume something common to all four cylinders, not to just one.
Could be clogging or another problem with the fuel delivery. Injectors, pump, etc. Without DTCs, you pretty much end up chasing down the mechanical operation of everything involved with creating combustion.
Or working through the real-time engine data to see what's not normal. But you don't have a normal engine anymore to contrast the measurements to.
When I had such a problem with an old car, it turned out to be a hole in the intake path between the MAF and throttle body. The flex tube along the way developed a crack at one of the flex seams.
In both cases, the problem was a lack of control of the intake air path between the MAF and the intake valves.
If you pull the cap out of the oil dipstick tube, change in idle? If you pull the tube from the PCV to the intake manifold off at one end and block both openings, change in idle?
Of course, it could be other things. Weak components in the spark path (coils/plugs). I don't know enough to know if the spark is stronger during higher loads, or if it's always the same current blast, to know if contamination such as oil could create weakness during low load.
Still, no misfires, would assume something common to all four cylinders, not to just one.
Could be clogging or another problem with the fuel delivery. Injectors, pump, etc. Without DTCs, you pretty much end up chasing down the mechanical operation of everything involved with creating combustion.
Or working through the real-time engine data to see what's not normal. But you don't have a normal engine anymore to contrast the measurements to.
06-23-2019, 08:00 PM
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06-24-2019, 12:53 AM
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PCV would have lots of DTCs popped, particularly misfires. Though that was the first thing I thought of from your problem description. What are you using to pull DTCs from the system?
When I had such a problem with an old car, it turned out to be a hole in the intake path between the MAF and throttle body. The flex tube along the way developed a crack at one of the flex seams.
In both cases, the problem was a lack of control of the intake air path between the MAF and the intake valves.
If you pull the cap out of the oil dipstick tube, change in idle? If you pull the tube from the PCV to the intake manifold off at one end and block both openings, change in idle?
Of course, it could be other things. Weak components in the spark path (coils/plugs). I don't know enough to know if the spark is stronger during higher loads, or if it's always the same current blast, to know if contamination such as oil could create weakness during low load.
Still, no misfires, would assume something common to all four cylinders, not to just one.
Could be clogging or another problem with the fuel delivery. Injectors, pump, etc. Without DTCs, you pretty much end up chasing down the mechanical operation of everything involved with creating combustion.
Or working through the real-time engine data to see what's not normal. But you don't have a normal engine anymore to contrast the measurements to.
When I had such a problem with an old car, it turned out to be a hole in the intake path between the MAF and throttle body. The flex tube along the way developed a crack at one of the flex seams.
In both cases, the problem was a lack of control of the intake air path between the MAF and the intake valves.
If you pull the cap out of the oil dipstick tube, change in idle? If you pull the tube from the PCV to the intake manifold off at one end and block both openings, change in idle?
Of course, it could be other things. Weak components in the spark path (coils/plugs). I don't know enough to know if the spark is stronger during higher loads, or if it's always the same current blast, to know if contamination such as oil could create weakness during low load.
Still, no misfires, would assume something common to all four cylinders, not to just one.
Could be clogging or another problem with the fuel delivery. Injectors, pump, etc. Without DTCs, you pretty much end up chasing down the mechanical operation of everything involved with creating combustion.
Or working through the real-time engine data to see what's not normal. But you don't have a normal engine anymore to contrast the measurements to.
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