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Old January 2nd, 2010, 12:07   #1
lmrjlr
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Default Rough Idle

After replacing the seals on my injection pump I am experiencing a rough idle. The car runs fine during normal driving speed. I first I suspected dirt in the lines or injectors so I added some injector cleaner to the tank but it did not help the situation.
Has anyone had any experience with changing out the Engine Speed Sensor? Could this be the problem? Or do I need to clean the Inector?
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Old January 2nd, 2010, 15:28   #2
TonyJetta
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The crank position sensor rarely fails. When it does, the engine won't start.

Which car are you referring to?

What is your IQ set at? i.e. Injection Quantity?

Tony
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Old January 2nd, 2010, 19:49   #3
lmrjlr
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this is on my 2000 bug . how would I know the IQ?
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Old January 2nd, 2010, 21:48   #4
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Need more information... Did You change the seals or did You have a trusted mechanic do the work? Did they or do You have a VCDS to read the IQ (Injection Quantity) and then re-set the proper values with mechanical adjustments to the head? Was the IP removed fro the car?
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Old January 3rd, 2010, 10:24   #5
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[FONT='Verdana','sans-serif']I changed the seals out myself. I did not remove the Injection Pump form the car. I did the seals on my 98 without any problems so I thought I would not on this one. Looks like the same pump to me. No I do not have a VCDS. I did it according to the instructions on the sight.[/FONT]
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Old January 3rd, 2010, 11:20   #6
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Quote:
Originally Posted by lmrjlr
[FONT='Verdana','sans-serif']I changed the seals out myself. I did not remove the Injection Pump form the car. I did the seals on my 98 without any problems so I thought I would not on this one. Looks like the same pump to me. No I do not have a VCDS. I did it according to the instructions on the sight.[/font]
This is common problem when you do pump seals with out VCDS and taking IQ volume before replacing seals. Most likely you have low IQ and you need to adjust it. Only way to that is with VCDS (VAG-COM).
I bet you in cold morning is getting worst, then when engine get hot it get little better.
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Old January 3rd, 2010, 11:46   #7
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Why would you need to adjust IQ volume when the pump was not distrubed?. Moreover, Imrjlr did the same procedure before without problem. See if replacing the filter helps. Also, if my understanding is right, the ecu determines IQ volume based on other parameters.
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Old January 3rd, 2010, 12:59   #8
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Quote:
Originally Posted by Dodoma
Why would you need to adjust IQ volume when the pump was not distrubed?. Moreover, Imrjlr did the same procedure before without problem. See if replacing the filter helps. Also, if my understanding is right, the ecu determines IQ volume based on other parameters.
Read the FIRST post:
Quote:
After replacing the seals on my injection pump I am experiencing a rough idle
He needs to check the IQ and adjust via hammer mod.

Tony


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Old January 3rd, 2010, 13:30   #9
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Quote:
Originally Posted by Dodoma
Why would you need to adjust IQ volume when the pump was not distrubed?. Moreover, Imrjlr did the same procedure before without problem. See if replacing the filter helps. Also, if my understanding is right, the ecu determines IQ volume based on other parameters.
Because he did upper seal and when you move that even if you make mark on pump you will have to adjust IQ.
Movement is in micro mm, so you can't see with eye. That why you need take IQ volume before you replacing seals to know how much you need put back when you replace seals.
I did a few ,and newer have been able to put it back same way that it was. I had to adjust with VCDS, or hammer mod.
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Old April 11th, 2010, 12:02   #10
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Just to let everyone know I did get the rough Idle fixed with the Hammer and wood block method. I did it with the engine running. I do not own a VAGCOM and I am sure it is not perfect but it is 90% improved. Before this my idle speed was around 1100 and rough. now it is around 750 to 800 - and smooth idle. Who would have believed that a ball pein hammer and a 4x4 wood block could fix my problem. Thanks again.
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Old April 11th, 2010, 13:58   #11
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That RPM is a little low. Spec is 903.

Tony
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Old April 11th, 2010, 14:42   #12
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Quote:
Originally Posted by TonyJetta
That RPM is a little low. Spec is 903.
Perhaps he is guessing about where it is since he doesn't have VAGCOM. Although I was unaware that the hammer mod messed with the idle speed. I have done this to my car and my idle was unaffected.

My idle used to sit at 903 rpms and then drop to 840 after sitting for 10 seconds. This made my idle very rough and not tolerable. I used VAGCOM and raised the idle to around 990rpms. Don't know if this is recommended but it helped smooth out the idle a bit. It also got my IQ to stay in one place. When the rpm drops the IQ bounces a lot. So lets say its at 4.0, it would bounce from 3.8 - 4.6. Just all over the place. Now it tends to vary only by 0.2. My IQ is currently at 5.0.

I've been told that the fuel quantity adjuster is warn out inside the pump. Does that sound right? I was told that the only way to fix the problem was to get a new pump.
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Last edited by egibbys; April 11th, 2010 at 14:48.
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Old April 11th, 2010, 14:57   #13
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The mod does not affect the idle, but fuel will.

The pump may wear, but you can adjust it doing the mod. There should be no need to replace the pump unless you can no longer get it to stay in spec.
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Old April 11th, 2010, 15:15   #14
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Are you refering to the timing? Cause its pretty close to "within spec". It bounces in and out of the area on the graph. Its just a little low. The mechanic says he can't get it any closer.
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