Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[cem_devecioglu]

not sure but I have experienced  , a small hole on exhaust pipes.. no remarkable noise but consumption changes..
 
and we hardly found it.. besides as said , air leaks also effect..

[Marks DTM Calib]

My 2.5 used to have an idle MAF reading of around 11Kg/h with AC off.

Do check the breather pipes are not split and also check for any other airleaks. I have seen the larger breather split near its base and cause very similar running and operation without affecting idle.

Unlikely to be MAF and the slow lambda readings hint more that its having to adjust across a wider range to go lean/rich (which is backed up by the learnt values)

[Webby the Bear]

My 2.5 used to have an idle MAF reading of around 11Kg/h with AC off.

Do check the breather pipes are not split and also check for any other airleaks. I have seen the larger breather split near its base and cause very similar running and operation without affecting idle.

Unlikely to be MAF and the slow lambda readings hint more that its having to adjust across a wider range to go lean/rich (which is backed up by the learnt values)

hmmm. i did the breathers 1500 miles ago. and i remember thinking the breather pipes were split where they connect to the plenum (or breather bridge). 4500 miles ago i also changed the clamp on the big pipe to breather box for a jubilee clip. maybe rechecking of all of the above???

[Webby the Bear]

ps, would a test for this air leak be to spray carb cleaner in the suspected pipes while running??

[Kevin Wood]

I would take them off and physically examine them. At this stage we need to be 100% sure so we can tick them off the list of suspects.

[Webby the Bear]

I would take them off and physically examine them. At this stage we need to be 100% sure so we can tick them off the list of suspects.

will do kevin thanks was just going to try and see if i could see a visible leak.

also it appears that my maf is down as mark got 11kg/h and i'm getting 9

[Marks DTM Calib]

Indeed it is but that does not mean the MAF is at fault, its simply an observation that the measured air mass is lower.....e.g. a potential air leak is present.

In the case of the large breather (which it may well not be), air would be leaked in before the throttle and idle control valve hence idle is unaffected other than the upstream MAF reading is lower.

[Webby the Bear]

Indeed it is but that does not mean the MAF is at fault, its simply an observation that the measured air mass is lower.....e.g. a potential air leak is present.

In the case of the large breather (which it may well not be), air would be leaked in before the throttle and idle control valve hence idle is unaffected other than the upstream MAF reading is lower.

ok thanks mark, i'm replacing fuel filter tonight and ill check the pipes prob at weekend. and ill also do the marigold test tonight too

[omega3000]

Indeed it is but that does not mean the MAF is at fault, its simply an observation that the measured air mass is lower.....e.g. a potential air leak is present.

In the case of the large breather (which it may well not be), air would be leaked in before the throttle and idle control valve hence idle is unaffected other than the upstream MAF reading is lower.

ok thanks mark, i'm replacing fuel filter tonight and ill check the pipes prob at weekend. and ill also do the marigold test tonight too

Quite robust those gloves ...

MARIGOLD 

[Webby the Bear]

ok chaps, evening was going well. marigold was instantly blown off on start up and i had it tied with a cable tie. Great. I then go to get the fuel filter off. Its off. But so is part of the fuel line :-( I'll post pictures later and i know it's fixable but could have done without this. Anyway anyone know how to fix this? Also to add insult to injury the other clip is very loose on the new filter. I've put the yellow cap on the one end but still have a fuel line free which I'm very nervous about. Please help :-( :-( :-(

[Webby the Bear]

ok been reviewing how to repair this. Am i right in thinking that i get a thicker diameter fuel line and cut a short piece to go over broken fuel line to link broken fuel line to fuel filter and then jubilee clip both tight? If I've got that right then any idea what diameter fuel line to use? Sorry lads but just worried as i currently have an open line at the moment :-(

[Lazydocker]

Have replied by pm webby but basically yes

[Webby the Bear]

cheers lazy, youre the best!
xxxxx

[Lazydocker]

cheers lazy, youre the best!
xxxxx

As I said, it's only a "temporary" repair and must be petrol rated line. But you would be better sourcing the right pipe and replacing it

[bootzey]

Hi Guy's. This sounds very similar to my problem see thread http://www.omegaowners.com/forum/index.php?topic=106685.0

Thanks for the input on that one. Had a miraculous recovery with it. Put a coil pack from Steve at Omega Spares on, which didn't cure it. However, a couple of mornings later it started no problem but after this is when I noticed the MPG drastically dropping.

So, I too have high consumption if you watch the fuel gauge but the instant cons on the mid is telling me she's doing 38 at 30-40mph, when I release the throttle and free wheel it goes upto 999.9! Which may well be normal.

I noticed the fuel pressure vacume pipe was disconnected n thought, wahey that's it! No chance lol. My injectors sound like they are really working hard, they are loud and can be heard in the car. Could the fuel pressure too high if the release valve doesn't work? I don't know how it works i.e. does the vacume increase or decrease the fuel pressure?

 Had the plenum off the other day, really clean, breathers too. But I have a slight hissing sound coming from the rear of the plenum on the drivers side, hopefully I'll have the scuttle off today n get my head in as far as I can to find it. The hissing changes when I move the pipes around, so something ain't right. Other than the split breather mentioned here is there anything else I should look for?

When I disconnect the battery the rough startup happens every time I reconnect it, almost like the ECU has senile dementia lol. The EML doesn't light up and the fault codes (0170, 0173) are also gone then after about 8 miles they are all back. If I disconnect the MAF (thanks to a hint on here) when rough starting she rev's sweetly at 1500 no problem. Reconnect the MAF and idle drops to 500 revs. Does this indicate a knackered MAF.

Sorry Webby, didn't mean to hijack you're thread but thought you might recognise my car's problems.

Cheers in advance

Dave