Peugeot Forums banner

1 - 17 of 17 Posts

·
Registered
Joined
·
22 Posts
Discussion Starter #1
I am having issues with my 2008 407 Coupe 2.0 HDi RHR. Leaving it idling for 30 seconds or so, cold or warm the engine will misfire / vibrate at 1300 rpm then rev up normally. If constantly rev it from idle it revs up fine.

When driving in 3rd gear, 4th gear, 5th gear and 6th gear at 1200 rpm till 2000 rpm I feel the engine vibrating or kicking.

In the morning, cold start, it cranks over for a couple of times then fires up.

I have taken the injectors to a specialist be tested and cleaned. Injectors are all good.

I scanned it for faults and none are found. No warnings or lights are flashing either.

Did anyone have this similar problem or does anyone know the route to solve this problem which I am experiencing?

Thanks for your time and help.
 

·
Registered
Joined
·
769 Posts
Leave the car overnight as you do, in the morning before starting the car, open the bonnet and there's a little hand fuel pump going into the fuel housing, pump it up so it's hard and see if it still has the same issues
 

·
Registered
Joined
·
22 Posts
Discussion Starter #3
Thanks for your reply BiGK.

I will squeeze the fuel priming bulb after work (after 9 hours) and I will get back to you.

If the bulb is squeezes, this means its loosing fuel from the fuel pump?
 

·
Registered
Joined
·
14,298 Posts
No it does not mean the fuel pump is loosing fuel it means there is an air leak INTO the system normally a bad pipe joint somewhere the pumps are generally pretty reliable.

Your initial description would have me checking the EGR valve and pipework.
 

·
Registered
Joined
·
22 Posts
Discussion Starter #5 (Edited)
Morning, so I squeezed the fuel priming bulb and had to squeeze it one and half times to harden. Fired up normally...

It still vibrated and misfired at 1300 rpm. I felt the engine being more responsive... dont know if its just me.

Shall I clean or replace the EGR and which pipework should I check?

Thanks all for your help and time.
 

·
Registered
Joined
·
769 Posts
It was a long shot... but it's a free check essentially. As said, it could be the EGR valve but I would also have a peek at the intake valve (diverter between turbo / intercooler & intake. )

That's the problem with these random faults.... you really need the car with you, shove it up on Peugeot Planet and go through the live data and see what values are out of spec. Could be as simple as a temperature sensor somewhere. If it was the main fuel pump, you would notice it at more than just 1300rpm.

Also check your engine mounts.... resonant frequencies can do all sorts :thumb:
 

·
Registered
Joined
·
1,014 Posts
I was just thinking engine mounts.

Grab the top of the rocker cover and use all your weight to try to rock the engine backwards and forwards. If it moves then the mounts need replacing.

+1 for EGR because it's open when the engine is cold. To confirm/eliminage: just blank it.
 

·
Registered
Joined
·
22 Posts
Discussion Starter #8
Thanks all for your help.

I can put my mind at rest that the fuel pump is doing its job well.

So, cleaning EGR for the misfire at 1300 rpm, the engine mounts for the vibrates and the fuel pipe work for the hard starting.

I guess that the gearbox mount is at fault here?
 

·
Registered
Joined
·
22 Posts
Discussion Starter #10
Took the Pug to my mechanic (ex Peugeot Mechanic) on Thursday.

Got the car back yesterday. The EGR was full of carbon and wasnt closing well, so it was cleaned and wow what a difference. Its not the same car anymore. More responsive, no smoke and no vibrations! I just hope it remains like this!

When I asked him if he found any fuel leaks and none were found. It still misfires (shakes) from idle to 1300 rpm when left at idle for some 40 seconds...

When i started it this morning it took sometime to fire up too.

Two rubber bushes were changed too as they were completely shot.

If this misfire (shake) isnt cured, I will take it to the main dealer.
 

·
Registered
Joined
·
1,140 Posts
Get it onto PP2000 live readings and check fuel pressures [expected and actual] and injector corrections at idle [while it is shaking]. If/when it stops it's shaking, recheck fuel pressures and injector corrections at idle and compare them.

I would check the ecu and injector plugs for signs of corrosion/water also.
 

·
Registered
Joined
·
22 Posts
Discussion Starter #13
I noticed something yesterday night. I had the interior lights on, and from idle, i revved the engine, and the lights dim for a second and back to normal. Can the battery or alternator be the issue here?

It still misfired at 1300 rpm. Going to book it at Peugeot.
 

·
Registered
Joined
·
769 Posts
I noticed something yesterday night. I had the interior lights on, and from idle, i revved the engine, and the lights dim for a second and back to normal. Can the battery or alternator be the issue here?

It still misfired at 1300 rpm. Going to book it at Peugeot.
Yes.... usually the voltage regulator on the alternator. See if you can use a multimeter to test the system voltage while doing that
 

·
Registered
Joined
·
22 Posts
Discussion Starter #15
I took off the throttle body (easy job) and cleaned it. It was full of oil and dirt. The IAT sensor was full of oil and so was the plate. Cleaned it with brake cleaner and washed everything off until it was spanking clean.

I assembled everything and went for a drive. I got a P1166 and P1351 (glow plug fault which apparently is no big deal)

I did reset the ECU after these faults showed up and it drove it again, it pulls much better.
 

·
Registered
Joined
·
22 Posts
Discussion Starter #16
I went out for a drive this week and the DPF did a regen, noticed because the wing mirrors got warm. During the regen it misfired / kicked at any rpm. To keep it stable I have to floor the accelerator. It is going to a Peugeot specialist soon.

I read about similar problems and checked the vacuum pipe from the throttle body which leads to a black box on top of the AC compressor. I have pumped air to check for leaks. It hissed for 3 seconds then stopped.
 

·
Registered
Joined
·
22 Posts
Discussion Starter #17
So, I have an update. The Fuel Pressure Regulator was replaced. No misfire, no shaking nothing. I hope it remains like this.
 
1 - 17 of 17 Posts
Top