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colin4255
Sr. Member
Posts: 119
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« Reply #3 on: March 01, 2010, 08:34:57 pm » |
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Thanks for the replies guys. I had not realised the car would run with the air mass meter unplugged. I'll try and find out the codes from the dealer, they are very helpful people, they are just struggling to understand what is going wrong.
I have had the usual issues witht he EGR valve, but now I can clean and/or change that myself if it goes wrong (stupid, stupid set-up really, wish I could by--pass or blank that off!!) , and I am fairly certain it is not the EGR valve. Likewise, injectors are all OK - it runs well and does about 38 mpg when its running properly. It does not even burn much extra fuel when the power goes away, nor does it smoke, it just goes 'flat' and has no accerleration.
No I don't think anyone has tried cleaning the throttle body system and the car has done 115,000 miles so maybe that is a good idea too. It could be sticking. The problem I find is the dealers use the clip test codes and just seem to want to swap out parts until a problem goes away. Its interesting that if the problem comes along and the car runs badly, that after switching it off and on afew times, it seems to run fine. It does this sometimes for weeks and weeks and then the issue will surface again. I change the air filter every 6,000 miles or so - its always clean.
I had wondered if it was a wiring fault, or maybe there was a fuse or relay specific to the air mass meter - ie some other thing that could be causing it not to work properly. I'll see what they say tomorrow and let you know.
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colin4255
Sr. Member
Posts: 119
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« Reply #4 on: March 01, 2010, 08:47:08 pm » |
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Renaultbiller - I should also have said, not explained very well in my first post, that I am now on my third air mass meter in less than a year. 8 months ago it 'failed;, Renault replaced it and billed me. Then it happened again inside the 12 month warranty period, so they replaced it FOC. I got it back last thursday and drove on saturday, 200 miles to see my father, and the problem happened again - ie no acceleration, very 'flat' engine response. Like I said, I change the air filter every 6,000 miles or so to make sure the engine can breathe OK. Also, oil changes every 8,000 miles and I NEVER use cheap diesel in it only the hi-quality expensive stuff like Total Exellium, or Shell V-Power. Otherwise car is fine.
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colin4255
Sr. Member
Posts: 119
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« Reply #6 on: March 02, 2010, 07:11:49 pm » |
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Thanks for the advice - I may give that a try, or prehaps make a blanking pate to seal off the apeture where the thin metalm pipe from top right hand side of engine, mates with the side of the EGR valve?
Regarding the air mass meter, dealer spent quite a long time checking today, and opened up the loom from the mass metere to the ECU, but could not find any damage or broken wiring. The clip showed the same fault code, air mass metere sensor failed. They did however, try the meter on another espace 2.2dci they had in the workshop and it seemed to work fine.
Interestingly, after they re-fitted it to my car and cleared the error codes, its worked fine all day - they have been driving around in it quite a bit.
Consensus is that there is some hard to find issue with the wiring somewhere, but they cannot trace it so far. More when I know it. All other sensors seem to check out OK too.
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GrahamT
Jr. Member
Posts: 46
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« Reply #9 on: April 24, 2010, 01:23:27 am » |
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I'm no expert, particularly regarding newer Renaults but it must be OBD2 compliant so they should be able to read what the sensors are doing live, as it were, while the engine is running, even while you're driving! I have an OBD2 lead and suitable software (PWM/ISO protocols) and can do that on my old Ford! It didn't cost a fortune either. My guess is that there is an air leak and the Mass Air Flow sensor is only reading a fraction of what the engine is using and it's fuelling accordingly. This would show up on a scan as a drop in, or permanently low MAF readings and as short term fuel trim adjustment. This seems to tie in with the air filter being clean, only a fraction of the air used is actually being filtered? The fact that you unplug the MAF means the ECU will use default values based on other sensors and fuel it closer to what it actually requires. Or I could be way off! I'd advise going back to the garage and ask them if they can run a scan while you drive and see if they can diagnose the scan and if not then get chatting to local garages and see who is clued up on OBD2!! I really hope this helps!! Good luck, Graham
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george
Newbie
Posts: 16
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« Reply #11 on: April 24, 2010, 06:18:58 pm » |
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Renault OBD2 compliant ? Are you having a laugh? By law they should be but Renault ,,,,,,,,,,
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