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Old 21-07-14, 03:22 PM   #1
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Cool 406 Lurching and Rev issue

Car - Peugeot 406 2.0L 16V, 5 Speed Manual

I have two problems that started after an oil change and installing a new control arm bush (front rear).

1. Below 2000 rpm the car will lurch when I back off the accelerator petal. The car pretty much jolts me forward. The opposite happens when I touch the accelerator petal, I get a sudden jolt backward. I suspect this might be caused by low gear oil.

2. The rpm does not drop immediately when I depress the clutch, the rev holds and drops after about 2 or 3 seconds, or when then gear is changed. I do not know if this is normal or not.

Any comments on what may cause these will be appreciated.
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Old 21-07-14, 03:54 PM   #2
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Originally Posted by eynestyne View Post
2. The rpm does not drop immediately when I depress the clutch, the rev holds and drops after about 2 or 3 seconds, or when then gear is changed. I do not know if this is normal or not.
The rpm should drop slowly - but start dropping immediately - when you press the clutch pedal.
Does this happen regardless of the speed (and rpm) you're at?
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Old 21-07-14, 04:23 PM   #3
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Originally Posted by Ahielia View Post
The rpm should drop slowly - but start dropping immediately - when you press the clutch pedal.
Does this happen regardless of the speed (and rpm) you're at?
Yes, wherever the rev is it hold at that point.

Before the oil change it would drop once the clutch was depressed.
I dont know if the oil change did something good or bad.

If I do not engage a gear it drops eventually. I have never seen it behave like this.

Last edited by eynestyne; 21-07-14 at 04:24 PM. Reason: added information
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Old 21-07-14, 04:54 PM   #4
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Are you able to change gears the moment you press the clutch pedal?
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Old 21-07-14, 05:23 PM   #5
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Are you able to change gears the moment you press the clutch pedal?
Yes. Gear changes are ok. I have no difficulty with it.
In fact I find it a bit helpful. With the rev holding like that I dont even have to rev match on downshifts. As for up shifts, the car pulls a lot more.

I am just concern that despite of these there may be something wrong.
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Old 21-07-14, 06:16 PM   #6
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Does the car run on for a few seconds once the keys have been turned off?

Does it ever cut out under full load?

If it has these symptoms as well it is certainly the fuel pressure regulator (FPR), it may still be the FPR with the small symptoms that you have.

This can normally be fixed by removing and cleaning it up a out.
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Old 21-07-14, 06:23 PM   #7
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Does the car run on for a few seconds once the keys have been turned off?

Does it ever cut out under full load?

If it has these symptoms as well it is certainly the fuel pressure regulator (FPR), it may still be the FPR with the small symptoms that you have.

This can normally be fixed by removing and cleaning it up a out.
It stops when I turn is off.
I dont think I have a problem with it shutting off.

Where do i find the FPR?
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Old 21-07-14, 06:31 PM   #8
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It is mounted on the right hand side of the fuel pump. (front left of the engine bay looking from the front)

Its fairly easy to get out once you have done it a few times, just be careful with the torx as they are normally fairly tight.

If it is the FPR I don't know why it would have come on all of a sudden after an oil change.
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Old 21-07-14, 09:30 PM   #9
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Thanks.
I will check that out.
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Old 29-07-14, 05:25 PM   #10
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Quote:
Originally Posted by eynestyne View Post
Car - Peugeot 406 2.0L 16V, 5 Speed Manual

I have two problems that started after an oil change and installing a new control arm bush (front rear).

1. Below 2000 rpm the car will lurch when I back off the accelerator petal. The car pretty much jolts me forward. The opposite happens when I touch the accelerator petal, I get a sudden jolt backward. I suspect this might be caused by low gear oil.

2. The rpm does not drop immediately when I depress the clutch, the rev holds and drops after about 2 or 3 seconds, or when then gear is changed. I do not know if this is normal or not.

Any comments on what may cause these will be appreciated.
I'm updating the thread with what I found.

If turns out that both problems were caused by a vacuum leak somewhere around the IAC value. I examined the engine's response when the throttle position was slightly moved and noticed a sucking/whistling sound.

I basically tightened all the clamps that connected to the IAC value and throttle body. Problem solved

Rev response is back to normal and there is not more lurching or jolt when coming of the petal.

I will be doing a more extensive clean of the throttle body and IAC value.
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