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Old 17-03-19, 12:20 PM   #1
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Default Hesitation on acceleration

My Peugeot 307 1.6 HDi has recently started to hesitation on acceleration, I unplugged the MAF sensor and it ran fine with it disconnected so I decided to order a secondhand one off eBay to get it by for a couple of months until I can afford a new one but as soon as I plug it in, I get the same problem. I have since brought another one one eBay in case the one I brought before was also faulty and it's still the same and I'm now wondering if there could be someone else wrong with the car? I just find it strange that the car runs fine with the MAF unplugged?
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Old 17-03-19, 01:33 PM   #2
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Im sure i have read on here somewhere that when you unplug the MAF the ECU disables the EGR valve and runs on default settings .Someone correct me if i am wrong.
So if it were me i would try and see if there is any codes stored using PP2000 and would be hoping to see some relating to the EGR
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Old 17-03-19, 02:56 PM   #3
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Is it simply struggling to accelerate or is it more of a missed beat as in symptoms of a misfire because the symptoms make a big difference as to what part(s) may be causing it. EGR sticking in the wrong position during driving will cause such symptoms as the ECU is constantly monitoring and storing its positions and referencing them so if it sees things it doesnt recognise from previous data it will question it but wont usually throw up a fatal error. Im asking as I have had an EGR hesitating to fly-back on the spring so effectively sticking open too long, that in turn will show up on the ECU as out of step with the MAF and errors will show accordingly but it has never shown on the performance of the vehicle at the time. Mine was only sticking probably only for seconds but if it fails to open or sticks completely open permanently that could be a different ball game. I just cut my losses and got another and it seemed to cure the EGR/MAF error codes but the car ran just the same as it did before. MAF sensors tend to be more reliable than EGR s so Id suspect the latter.
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Old 17-03-19, 04:02 PM   #4
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Yes it seems more like a misfire and there are EGR error codes showing but I replaced the EGR valve with a new one a couple of months ago but the codes stayed and are still there. Do you think I could solve the problem by blanking off the EGR valve? Would the engine management light stay on? Thanks
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Old 17-03-19, 06:05 PM   #5
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Dont go blanking the EGR off, its there for a reason and if its blanked off you need to reprogram the ECU to ignore it and, after going to all that trouble, it may get picked up in your next MOT as poor emissions. Its all a bit dodgy, and if found out, illegal. I think you would be best looking at the Crank sensor. You may have a suspect connection on the plug/socket. Wheel off, take the lower wheel-arch liner off and gain access to the crank pulley and you will see the sensor just bellow the pulley. take it out the sensor and give it a good clean. Make sure the seal on the plug is intact and then push the plug back home in the socket -making sure the seal goes right home well into the socket with the plug. If the plug is properly inserted its quite obvious, its solid with the socket. If there is any play between the two - and its barely noticeable, you will get bad triggers from the pick-up wheel on the pulley which will give symptoms of misfire and hesitation has the engine rocks on the mounts. The EGR errors exist but for seperate reasons. You main problem is probably nothing to do with it. Worth a try if nothing else..
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Old 17-03-19, 10:15 PM   #6
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Quote:
Originally Posted by Pluggit View Post
Dont go blanking the EGR off, its there for a reason and if its blanked off you need to reprogram the ECU to ignore it and, after going to all that trouble, it may get picked up in your next MOT as poor emissions. Its all a bit dodgy, and if found out, illegal. I think you would be best looking at the Crank sensor. You may have a suspect connection on the plug/socket. Wheel off, take the lower wheel-arch liner off and gain access to the crank pulley and you will see the sensor just bellow the pulley. take it out the sensor and give it a good clean. Make sure the seal on the plug is intact and then push the plug back home in the socket -making sure the seal goes right home well into the socket with the plug. If the plug is properly inserted its quite obvious, its solid with the socket. If there is any play between the two - and its barely noticeable, you will get bad triggers from the pick-up wheel on the pulley which will give symptoms of misfire and hesitation has the engine rocks on the mounts. The EGR errors exist but for seperate reasons. You main problem is probably nothing to do with it. Worth a try if nothing else..
Thanks will give that ago tomorrow and report back
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Old 18-03-19, 08:38 PM   #7
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Originally Posted by doggax99 View Post
Thanks will give that ago tomorrow and report back
So this evening I decided to give it ago, I took the wheel off with the lining and could get to the crank sensor really easy, however after pulling the wire out and undoing the bolt, I just couldn't manage to pull the sensor out. I got it free but something was stopping it from coming out. After about half an hour of trying different angles to get it out, I decided to drench it in WD40 while wiggling it in the hope that this might be enough to clean it. I will take it for a good run tomorrow and let you guys know if its any better, fingers crossed.
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Old 18-03-19, 09:42 PM   #8
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Probably bottom crank pulley in the way ? and the rest

Just thinking about fuel pressure switch ? or wiring
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Old 19-03-19, 08:24 AM   #9
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You have to manouver it out so the sensor tip just clears around the plastic belt cover. Theres only mm of room at acertain angle but when you have got the knack its surprisingly straightforward.Main part of the exercise here is the cleaning and relocating bit, which you have done,so see how it goes now..
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Old 19-03-19, 01:32 PM   #10
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I have been out in the car today and looks like its still playing up, I have had to disconnect the MAF again to stop it from feeling like its misfiring, any other ideas?
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