Peugeot 406 revs up and down
Variant: 18 16 valve
Model Year: 1999
Categories:
Running Rough, Starting & Power Loss
struggles to start when cold,then ok untill is hot, ive cleaned all the throttel body, stripped it rite down cleaned stepper motor,and all other parts,revs dropped slightly but still goes up n down ,first time it started after clean it reved up to 3000 rpms, then whilst warming up it dropped to 1000 rpms,no less,then up n down it went again.things we have changed/ :lambda sensor because rac guy plugged it in n said its faulty,cost 98 quid n still the same, please help!!!
Posted: Jul 8, 2010 (14 years ago)
Possibly ECT ( engine coolant temp ) sensor ? Also could check this re. same problem.
Re:peugeot 406 1.8 lx t reg
« Reply #1 on: 19:08 30 11 2003 »
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Hello Brian
Yes its a good idea about getting the fault codes read, but this may not reveal the fault especially if the engine warning light is not coming on.
A common fault on these engines as they get a few miles on the clock is a poor connection onto the MAP sensor which will give the symptoms you have got.
To check to see if this is the fault is quite easy, locate the sensor by putting you hand under the bottom of the inlet manifold and the sensor is there in the centre facing rearwards towards the engine.
With the engine running wriggle the connection plug and wiring and note if the engine speed changes splutters or varies, if so you will require a new sensor and connecting plug.
Hope this might be of some help.
Good luck.
Re:peugeot 406 1.8 lx t reg
« Reply #1 on: 19:08 30 11 2003 »
--------------------------------------------------------------------------------
Hello Brian
Yes its a good idea about getting the fault codes read, but this may not reveal the fault especially if the engine warning light is not coming on.
A common fault on these engines as they get a few miles on the clock is a poor connection onto the MAP sensor which will give the symptoms you have got.
To check to see if this is the fault is quite easy, locate the sensor by putting you hand under the bottom of the inlet manifold and the sensor is there in the centre facing rearwards towards the engine.
With the engine running wriggle the connection plug and wiring and note if the engine speed changes splutters or varies, if so you will require a new sensor and connecting plug.
Hope this might be of some help.
Good luck.
Posted Jul 8, 2010 (14 years ago)
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