307 1.6 hdi hesitation

[johntom]

Hi
My 2005 307 1.6 hdi has a hesitation and doesn't seem to accelerate strongly like our C4 with the same engine (both 1.6 hdi 110bhp).
I have lexia/Peugeot Planet - no codes showing, any ideas where I start ?
Thanks

[spider]

If no codes first thought (assuming fuel filter is good and not dirty) is the MAF. You could try unplugging it (ignition off! don't unplug it while its on) and then see if its any more powerful without as it will assume a default value for the awol input.

[johntom]

thanks for that, I must be thinking along the same lines as I bought a fuel filter today (not fitted yet). I will try the MAF unplugged as well. Would air leaks in the rubber hoses (intercooler etc) cause a fault code?

[spider]

Possibly although you'd notice a large lack of power I think. While you're sorting fuel filter etc you'll probably be able to get to various vac hoses etc, its worth carefully checking these for cracks / splits etc too.

[johntom]

I disconnected the MAF and it seemed to drive slightly smoother and with a bit more umph! No fault codes or engine management light with Maf unplugged, does this confirm a faulty MAF ?

[spider]

If there's an increase then yes usually although I'd see if anyone else posts, its not my personal area of experience although it does seem to be a reasonably common 'test' to determine if a lack of power is slightly improved with unplugging it.

Used one might be OK, beware of really cheap Ebay new ones they tend to not be any good at all.

[Gibbo_Wirral]

If its a 110 you may find that its the EGR playing up. I've had a 307 and 407 which had the same problem - a brief hesitation when accelerating after changing up to 3rd or 4th gear, always around 1800 rpm.

Disconnecting the MAF improved things, but a Planet diagnostic showed that the MAF wasn't faulty, the disconnection was just putting the car into a different "mode".

You can get a blanking plate off Ebay.

[johntom]

Hi
There aren't any fault codes showing on my Peugeot Planet, would there be if the MAF or EGR was faulty?
Also if I blank off the EGR will it bring on the Engine Management Light (did on my '05 C5 - may have the unused blanking plate somewhere)?

[spider]

I don't think it can really record a faulty MAF unless its really bad so no code is normal. It may of logged a silent code as you've ran it without it connected (nothing to worry about)

There should be no lights for the EGR either I think. Was it a 2.2 ?

[johntom]

Hi
No the C5 was a 54reg 2.0 hdi

[spider]

The only cause for the warning light that I can think of on that model when the EGR is blanked is if it had a FAP (particle filter arrangement) possibly or an unplugged vac hose / plug.

The plate normally blocks the 'inlet' side so if the EGR has a cooler (useful to quickly heat coolant too when cold) you don't lose this part.

[Gibbo_Wirral]

Hi
There aren't any fault codes showing on my Peugeot Planet, would there be if the MAF or EGR was faulty?
Also if I blank off the EGR will it bring on the Engine Management Light (did on my '05 C5 - may have the unused blanking plate somewhere)?

Not always. You might get a P010x error if the MAF is faulty but I've had two Pugs - a 306 and 307 where it was down on power and there were no codes on Planet.

You shouldn't get any EML warning if you blank either. My last blanked 307 (the 1.6 110) is still fine a year on. My current 2.0 90bhp has had the vac pipe blocked with a golf tee for about three weeks and that's also running great.

[johntom]

Hi
I have fitted an Egr blanking plate today and the car seems more responsive lower down but it's still slow after say 2000rpm as though the turbo not having any effect (definitely slower to pick up than the C4 1.6 hdi 110- same engine) I have tried with the maf unplugged and I can't tell a great difference, but it's certainly not worse?
What else can I try?

[johntom]

Hi I have connected it to planet and discovered the following codes under 'engine ECU'

P2032, P2127, P2124, P0122, P1471, P0098, P0104 and ADDG02 (diesel tank cap signal open circuit) !!!

P2032 is particle filter upstream temperature signal too high?
P2127, P2124, P0122,P1471 intermittent faults- relate to turbocharger air cooler bypass butterfly solenoid valve?
P0098 intermittent fault- air temp after exchanger signal open circuit?
P0104 flow meter signal-permanent fault?

What does it all mean ?? Is the turbocharging air cooler bypass butterfly etc the air dozzer between the 4 rubber hoses near the intercooler?

[Gibbo_Wirral]

Lots to go at there. The thing is interpreting the codes, you shouldn't just throw parts at each issue - as one fault could be causing an error in the others. For example, a faulty MAF sensor (P0104) could be causing the P0098 fault. All the turbo ones could be because of the cap sensor.

If you've got Planet you get a "P" fault code and description. Break them all down individually and then search the forums for the fault and how a previous owner fixed it. They're all common issues which have been dealt with, maybe not on here but certainly another Peugeot forum.