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19th May 2024, 20:03 | #1 |
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P0174 system too lean, bank 2. What's the cause?
Hi all,
Apologies for the lengthy post - there's a bit of back story to this one. Had a bit of a disaster the other day. Driving on holiday and my engine loses power completely - the revs just start dropping and suddenly I'm just coasting. Luckily just happened to be passing by a layby so pulled in, tried to restart engine, and it was dead -just turns without firing. A quick look round the forum from said layby made it sound like the dreaded Fuel Filter Syndrome - my car being a 2002 petrol v6 - so I call out the RAC who take a look, and confirm the two part fuel filter has come apart. They screw it back together, and the car gets me where I'm going, but something still seems off, as there's a lingering smell of petrol outside the car.... I try to start the car the next morning, and although at first it won't fire, it catches when I try a second time. I put a few revs on and all is fine for a second, but suddenly the revs drop off a cliff and it keeps bottoming, going between 400-200 revs, and sounding like it's about to stall (because I guess it is). Putting my foot down does nothing. So I have another visit from the RAC who after much drama get access to the fuel filter again, only to find one part of the rubber seal around the top of the petrol tank/fuel filter wasn't seated properly, and was half in the fuel tank itself, having been pushed too far down, leaving a direct route from the outside of the car to inside the fuel tank - which at least explains the petrol smell outside the car. In testing the fuel filter cap was still tight, he twisted the top right, left, then right, which appeared to loosen it slightly (which is exactly the opposite of what I want!) He put it back together, we fired it up, and it at least started and kept a steadier revs - but it was running lumpy, is now backfiring at 2000 rpm, and my check engine light came on, with the error code P0174 - system too lean (left bank). I don't remember this coming on before - the first time I saw it was after this second repair. It seems unlikely I would have ended up with two separate problems at exactly the same time, but would the RAC not managing to get the fuel filter in properly (again) really cause it to run lean one sided? Or is this something other than Fuel Filter Syndrome? The car is currently being recovered back home via an RAC "secure compound", so I was really hoping to consult the hive mind before I get to take a proper look when I get it back. The codes were read via my £5 ebay jobbie OBD sensor, as the RAC man's tablet couldn't get a reading at all... Last edited by ianM; 19th May 2024 at 21:11.. |
26th May 2024, 18:03 | #2 |
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Hoping to bump this for the bank holiday weekend. Still haven't actually got the car back from the RAC, unbelievably, but hoping to gather thoughts about what to look at when we're eventually re-united...
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26th May 2024, 18:24 | #3 | |
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Please report back if that doesn't cure the lumpiness and backfiring. Simon
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27th May 2024, 15:27 | #4 |
I really should get out more.......
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Not clear to me if the original filter is still in place or did the RAC man replace it - if not that will be the likely cause - you need to fit a fuel filter clip ASAP - if you still have problems make sure the filter O ring is in good fettle and properly sited.
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8th June 2024, 13:34 | #5 |
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OK, I've finally got the car back.
I've taken the rear seat out, and the rubber rings around the fuel filter weren't in place at all (the inner one was pretty much dangling around the bottom of the fuel filter having a swim in the tank). The RAC guy didn't replace anything - just screwed the filter back together. The car is still only barely running - it starts, then within a few seconds stalls. I'm trying to get the fuel filter to pieces, but I can't actually turn it. Even with two of us trying, the lid will not budge. I've heard it can be tight, but this seems excessive! I was hoping I could get it to pieces to check on the o-rings, tighten it back up and then fit the orange (or white in my case) clip. But we just can't make the lid budge. Is there any trick for getting it open to check it? I'm starting to be concerned it's something other than FFS, but seeing as my fuel filter had come apart when the first RAC man came, I think it's unlikely I'd have two separate issues. |
8th June 2024, 14:29 | #6 |
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Just tried with a "boa constrictor" and an oil filter wrench but still can't get it apart. This seems unusually tight for something that's giving me so much trouble.
I think I'm going to have to get the whole filter out to have a proper look at it. But with all the pipes below.... How do I do it? Is there a how to? |
8th June 2024, 17:51 | #7 | |
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Simon
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8th June 2024, 18:23 | #8 | |
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Yeah, it certainly seems to be. All sounds fine, runs continuously when it starts too. I guess that should rule out a fuel pump issue? |
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8th June 2024, 18:58 | #9 |
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We do need to be sure that this is not a fuel pump circuit fault. You said that when the engine runs, it does so only for a few seconds. With the noise of the starter motor and engine to consider I wouldn't expect the hum of the pump to be clearly audible without the help of an assistant. How did you determine that it is running?
Simon
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8th June 2024, 19:02 | #10 | |
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Quite literally exactly like that - I had an assistant with his head next to the fuel filter! I've also held my head there too, and you can hear the pump whooshing surprisingly well (I had no idea what it sounded like until a few days ago!) Last edited by ianM; 8th June 2024 at 19:05.. |
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