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grueng 11-17-2005 08:38 AM

260E - hesitation
I have had this problem a while, but will try to find out what causes it.

When the engine is cold it runs fine.
It is always OK at idle.

When I accellerate the engine often hesitate. Specially at 30-80 km/t. It acelerates, but it has not got the power it should have.
If I not push the pedal so much, it will accellerate better!! If I push the padal more again, it hesitates. During this hesitation another sound is coming from the engine. Not a bad sound, but a different sound. All cylinders are working. It runs smooth even when it hesitates. Only loss of power.

With full throttle / kickdown, the accelleration is just fine.

The mixture is OK, duty cycle OK, new o2 sensor, new fuel-pump relay, new injectors, no vacuum leaks.

I have read some threads about replacing the airflow potentiometer.
Do you think this will do?
Or is it the EHA which "control" this?

Any help will be appreciated.


neanderthal 11-17-2005 03:27 PM

mine had a hesitation/ misfire under load (hills, acceleration etc) it needed new spark plug wires.

lkchris 11-17-2005 04:03 PM


Originally Posted by grueng
I have read some threads about replacing the airflow potentiometer.
Do you think this will do?
Or is it the EHA which "control" this?

EHA must be fine, but purpose of potentiometer is to indicate need for extra fuel when accelerating when engine is cold.

grueng 11-21-2005 06:16 AM

I have this weekend inspected the airflow potensiometer.
It looks fine and there is minimal wear on the contact-surface.
Resistance in ohm when pushing down the plate seems also OK.

Is it possible that the EHA-regulator can couse this problem?
If so, maybe I can try with a part from another car.


sbourg 11-21-2005 10:16 AM

Make sure the airflow meter pot is re-installed in the same exact orientation. Problems with this item most likely to manifest at/near idle. Enrichment needed at speed is less than at idle, but fuel flow is much greater. For this reason I would check on fuel supply, e.g. weak pump. Other than fuel, ignition advance, exhaust restriction, air restriction (e.g. clogged filter) are all possibilities.


grueng 11-21-2005 02:15 PM

1 Attachment(s)
I marked the position before removing it.

Here is a picture of the pot-meter attatched:

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