Acceleration flat spot - Peugeot Forums
Peugeot Forums - Peueot - Citroen Community
Home :: Peugeot Forums :: Rules :: Articles :: About Us :: Partner Vendors :: Advertise


Go Back   Peugeot Forums > Peugeot Models > 307
PeugeotForums.com is the premier Peugeot All Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 01-09-18, 11:55 AM   #1
Senior Member
 
Crickleymal's Avatar
 
Join Date: Aug 2018
Location: Gloucester
Posts: 142
Default Acceleration flat spot

The car (53 reg 307sw 2.0 110hp) works perfectly 99% of the time. But sometimes you try to accelerate and if it was a petrol car I'd say the engine was flooding. The acceleration is very poor then suddenly away we go.
EGR possibly?

Malc
__________________
Malc
Crickleymal is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 01-09-18, 01:47 PM   #2
Moderator
 
windy1603's Avatar
 
Join Date: Sep 2012
Location: Hertfordshire
Posts: 5,512
Default

If it does not smoke unlikely to be EGR.

Check MAF is clean and all vac and turbo pipes are fitted and in good condition.

Disconnect the vac pipe from the vac pump and squirt a shot of oil into the pump and refit, lastly if Bosch injection check harness from rail pressure sensor where it drops down behind starter motor for flaking insulation/damage.

These are all common faults which can cause intermittent boost and fuelling issues
__________________
DS5 & DS4 DSport 2.0 HDI 2012, 107 1.0 Urban 2006, 208 1.6 e-HDI Feline 2014, Suzuki RGV 250M 1989 (Money Pit)
windy1603 is offline   Reply With Quote Quick reply to this message
Old 01-09-18, 02:06 PM   #3
Senior Member
 
Crickleymal's Avatar
 
Join Date: Aug 2018
Location: Gloucester
Posts: 142
Default

No smoke. I'll have a look in a bit when the engine is cold. Where's the vac pump?
Crickleymal is offline   Reply With Quote Quick reply to this message
 
Old 01-09-18, 02:21 PM   #4
Moderator
 
windy1603's Avatar
 
Join Date: Sep 2012
Location: Hertfordshire
Posts: 5,512
Default

Gearbox end of cylinder head you will see servo vac pipe leading from it
__________________
DS5 & DS4 DSport 2.0 HDI 2012, 107 1.0 Urban 2006, 208 1.6 e-HDI Feline 2014, Suzuki RGV 250M 1989 (Money Pit)
windy1603 is offline   Reply With Quote Quick reply to this message
Old 02-09-18, 09:14 PM   #5
Senior Member
 
Crickleymal's Avatar
 
Join Date: Aug 2018
Location: Gloucester
Posts: 142
Default

Looked at vac pump. Tried to get some oil in there but I only had a spray can with no tube so it was a bit hit and miss. How much is a shot?
Cleaned MAF with some white spirit. Neither has worked. It does it more now so I suppose eventually it'll break properly and then we'll know. It goes slowly up to 3000 rpm then suddenly accelerates. Once it's cleared it's throat so to speak we're ok until the engine idles or runs gently for a while.
I can't even see the starter motor so will investigate further. There are no warning lights on.
__________________
Malc
Crickleymal is offline   Reply With Quote Quick reply to this message
Old 03-09-18, 10:32 AM   #6
Senior Member
 
Join Date: Sep 2016
Location: Stoke on Trent
Posts: 1,798
Default

At the back behind the exhaust. If still fitted the lower panel has to come off to see.
madbadandold is offline   Reply With Quote Quick reply to this message
Old 04-09-18, 09:30 AM   #7
Senior Member
 
Crickleymal's Avatar
 
Join Date: Aug 2018
Location: Gloucester
Posts: 142
Default

I can't see anything fundamentally wrong with the wiring. I did put a can of EGR cleaner through the system and it made a huge difference. BUT it's started reverting to what it was. Having done a bit of browsing on the internet I'm half inclined to suspect the MAF sensor.
Crickleymal is offline   Reply With Quote Quick reply to this message
Old 04-09-18, 10:13 AM   #8
Senior Member
 
Join Date: Dec 2017
Location: Fife
Posts: 117
Default

I'm not sure if it works on the HDi engine but on other diesel cars I've owned you could unplug the MAF and it is runs better you know the MAF is faulty.

I'm having roughly the same problem with my car (2.0 110 HDi) but I've been so busy with other life things I've not done more diagnostic work on it.
307SW_HDi is offline   Reply With Quote Quick reply to this message
Old 04-09-18, 10:23 AM   #9
Senior Member
 
Crickleymal's Avatar
 
Join Date: Aug 2018
Location: Gloucester
Posts: 142
Default

Quote:
Originally Posted by 307SW_HDi View Post
I'm not sure if it works on the HDi engine but on other diesel cars I've owned you could unplug the MAF and it is runs better you know the MAF is faulty.

I'm having roughly the same problem with my car (2.0 110 HDi) but I've been so busy with other life things I've not done more diagnostic work on it.
I was going to try that when I get home. I haven't had an engine management light up yet which I would expect if there is a faulty sensor though. Still can't hurt to try.
Crickleymal is offline   Reply With Quote Quick reply to this message
Old 04-09-18, 05:09 PM   #10
Senior Member
 
Crickleymal's Avatar
 
Join Date: Aug 2018
Location: Gloucester
Posts: 142
Default

Ok. I disconnected the MAF sensor and now it seems to be in the fault condition all the time. i.e. flat acceleration up to 3000 rpm then off it goes. Now does this mean the MAF is faulty intermittently? When connected the problem seems worse when the engine is hot.
__________________
Malc
Crickleymal is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Peugeot Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in


Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT. The time now is 02:01 AM.



Powered by vBulletin® Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.