Running like a bag of.....

Post 608333 by Tomcat on 2013-05-20 11:20:00

After yesterdays fun I managed to get the car back together this morning, however on start up it ran like a bag of §§§§. I rechecked all my connections, all good, checked one of the plugs I pulled yesterday and cleaned and it was back to being black again(already). The car was hunting, struggling to tickover and wouldnt rev, after a few minutes wondering what to do I pulled the connection on the MAF, lo and behold the car runs great, ticks over nicely etc.. What I want to know is.... I know the car was running rich prior to me pulling the cat yesterday but why would the cars behavious change so much from just removing the cat?, it only has the one O2 sensor in the exhaust and thats well before the cat. I'm now presuming that the MAF has been bad all along and that is whats caused the cat to fail?.. (really horrible bad egg smell every time you drive it). I orginally thought the MAF was new but upon closer inspection it's not. Can I safely run it with the MAF unplugged while I wait for a new one?, I've read that you can but I wondered if anyone on here has done it?.

Post 608349 by c70geoff on 2013-05-20 12:49:10

i ran mine ok for a month or 2 with maf unplugged but did use a very noticable amount of fuel over usual. then the etm light came on so its up to you fella i personnaly wouldnt do it again but i was lucky that i only had to clean the butterfly on my etm as it was coked right up

Post 608356 by Tomcat on 2013-05-20 13:15:57

Yeah well this things been just drinking the stuff anyway, it's averaging about 14-15 at the moment (and thats being conservative) so if it gets me a temporary improvement while I source another I'll be happy

Post 608359 by c70geoff on 2013-05-20 13:26:11

just be careful of the etm mate not sure that anyone else has had that issue but seemed odd to me that it happened when maf was disconnected for so long and like i said i'm guessing i was lucky to have to just clean it maybe when u get ur maf u could give the etm a clean anyways

Post 608389 by Dangerous Dave on 2013-05-20 14:48:24

Don't think he has an ETM Geoff. TC I thought the M4.4 engines had two O2 sensors? Has it thrown a code?

Post 608397 by JamesT5 on 2013-05-20 14:58:06

Spuds...? Sorry, I thought it was a 'finish the title' thread. ;)

Post 608403 by partsforvolvos.com on 2013-05-20 15:27:35

I thought that should have 2 sensors as well? for a de cat with 2 sensors, dont you have to refit the second, but with a tube to space it back and fool the ecu .

Post 608404 by Jamest5r on 2013-05-20 15:32:06

The phase 1 v70r's only have one pre cat lamba that's why the remaps on them can only be used on another 70r.

Post 608405 by Tomcat on 2013-05-20 15:36:39

Yes its only got the one sensor. Going out for a little drive in it shortly, here's hoping it's ok..

Post 608410 by Tomcat on 2013-05-20 16:08:27

Just been out in it and it's still runing like crap the exhaust is blowing a little somewhere underneath but it's nowhere near the o2 sensor,from the amount of smoke it's chucking out I'd say that even with the maf disconnected its overfueling a lot. If the O2 sensor was blocked or knackered would that also cause it to overfuel?, I wired brushed all the soot off it yesterday and it looked pretty new.

Post 608462 by Tomcat on 2013-05-20 19:16:26

No one got any ideas?.. Not sure where to go with it, I have a spare o2 sensor but for some reason I cut it off the old car so to put it on the R I'd have to cut the old one off and solder this on, could just try cleaning it first. Can't understand why its running this bad when all I've effectively done is remove the cat.

Post 608464 by Jamest5r on 2013-05-20 19:22:53

Ive got a spare maf lying around somewhere, ill dig it out and send it to you before you start laying out dough for no reason

Post 608465 by Tomcat on 2013-05-20 19:48:15

Thanks James it's good of you to offer

Post 608469 by Nealevo on 2013-05-20 20:05:26

My 850 had similar issues a while back, smoke and poor running, it turned out it was the cheap MAF I'd brought, stuck a genuine one on and it has been happy ever since, hope you get it sorted

Post 608470 by Tomcat on 2013-05-20 20:23:33

Thanks, I'd be back tracking but as I said I've not changed anything other than removing the cat, got me stumped... Gonna whip the O2 sensor off in the morning and give it a clean, then if it runs a little better I'll try the Maf again. Giving it a miss for today though as I'm still knackered..

Post 608471 by Jamest5r on 2013-05-20 20:40:59

Ok found it, can send it though my work and you will have it wednesday but it will cost you a tenner off my splitter bill as i have to pay the van driver :) Maf is foc :)

Post 608475 by Biff on 2013-05-20 20:51:41

I'd say try your maf dude, mine was the same when I first got it, spluttering & overfuelling. The new genuine maf sorted it right out.

Post 608479 by Tomcat on 2013-05-20 20:58:57

Thanks James, your a star. Biff, it could well be the Maf as it was definatley over fueling before I removed the cat but I just cant work out why its suddently running like crap.

Post 608487 by martybelfastt5 on 2013-05-20 21:09:53

mine done it unexpectedly run like a bag of spanners had to stop and restart somtimes drove ok after when a new one was fitted the power increase was big too mad difference! smiles all round!

Post 608488 by Tomcat on 2013-05-20 21:16:33

Here's hoping that's what it is then Martyn, I've no car now until I get it fixed, it's running too poor to use as is.

Post 608500 by Dangerous Dave on 2013-05-20 21:31:57

Have you tried resetting the ecu TC? It might have be the blocked cat was being compensated for by the ecu.

Post 608504 by Tomcat on 2013-05-20 21:35:04

Oh, no I've not bud. How do I do that?

Post 608505 by Volvostorm on 2013-05-20 21:35:05

Try running it without the lambda plugged in, mine is overfueling, and it runs better without the lambda.

Post 608506 by Volvostorm on 2013-05-20 21:36:42

To reset the ecu, unplug it for about an hour, then just plug back in, it will run bad for a while till it re learns everything.

Post 608509 by Tomcat on 2013-05-20 21:39:12

Do I need to disconnect the battery while I do this?

Post 608510 by Dangerous Dave on 2013-05-20 21:39:29

As Paul says, just unplug it, perhaps remove it overnight to be sure. At least then it will be back to base settings. That is unless you unplugged the battery for a while recently, which will have had the same effect.

Post 608512 by Dangerous Dave on 2013-05-20 21:40:19

[QUOTE=Tomcat;608509]Do I need to disconnect the battery while I do this?[/QUOTE] Nah, just remove the ecu lid and unlock/pull out the ecu

Post 608514 by Tomcat on 2013-05-20 21:43:52

Giggedy.... I'm off to give it a whirl now,lol.. will report back in an hour,lol.. (that'll please the neighbours,lol.)

Post 608521 by Dangerous Dave on 2013-05-20 21:49:21

LOL, worth a try matey. Probably best do it when you get a new MAF too.

Post 608530 by Tomcat on 2013-05-20 21:58:55

It's off, countdown has comenced, lol.. Gonna give it a try in the morning I think as it's gonna be nearly 11 when it's time to plug it back in and I'm up at six... Thanks bud.

Post 608537 by Dangerous Dave on 2013-05-20 22:07:26

Haha, bet you can't wait that long.

Post 608579 by Biff on 2013-05-21 00:16:36

Maybe the cat was blocking the flow if it had collapsed & the ecu had held back on fuel causing it to run lean with a screwed maf. Now you've removed the cat & the gasses can flow properly its running rich? The knackered cat could've hidden the maf issue. As for your mpg dude, mines doing approx 22to the gallon with a knackered flexi & holes everywhere. It was shocking when my maf was a cheapie fuel parts job. If my car wasn't getting the exhaust fitted this week I'd offer to drive up so you can try mine.

Post 608638 by Tomcat on 2013-05-21 10:55:27

Fixed!!!...and...I'm officially an idiot..(yeah you all knew that already didnt you?) Plugged the ecu back in this morning, plugged the maf back in and for about ten seconds it ticked over great, then started stumbling again so I removed the Maf plug, started it again and nope still crap, then it dawned on me.. When the jack slipped the other day it squashed the bottom of the rad a little, smashed the bottom of the fan (also a little) and..... Split the frikkin intercooler... Once I realised this and cobbled a by pass together it ran like a bloody swiss watch again. While I was under it I also stopped the exhaust from blowing too. sounds a LOT better now, pulls ok (though still smokey.

Post 608641 by martybelfastt5 on 2013-05-21 11:06:46

doh lol ive an intercooler from a t5 think its slightly different from the 850/v-s70R one tho tc here if you need it

Post 608647 by Tomcat on 2013-05-21 11:30:12

Thanks Martyn, as far as I know the intercoolers are all the same (I think).. What do you want for it?

Post 608650 by Jamest5r on 2013-05-21 11:45:37

You not need this maf now?

Post 608651 by Tomcat on 2013-05-21 11:49:00

Probably still do James, it was running rich before anyway. Dont suppose you've got the intercooler, radiator etc have you?.

Post 608654 by Jamest5r on 2013-05-21 11:54:30

Yep all still as one with ac

Post 608660 by V70 Graham on 2013-05-21 12:16:04

[QUOTE=Tomcat;608651].....dont suppose you've got the intercooler, radiator etc have you?.[/QUOTE] [QUOTE=Jamest5r;608654]Yep all still as one with ac[/QUOTE] Jim get's some beer/petrol money and Tomcat fixes his car....."winner winner chicken dinner".....that's what VPC is all about.....helping people.

Post 608664 by martybelfastt5 on 2013-05-21 12:33:49

if you want it tc just post ....in the shed for ages just keep moving it about lol saying that there is a difference in flow rate tho small all the same there if you want it stole from wiki For a limited time in 1996, Volvo offered a new heavy duty manual transmission designed specifically for the 850 R (none US market), called the M59, which featured both a viscous coupling and a Torsen differential. Furthermore, the M59 equipped cars were fitted with the B5234T4 2.3-litre 5-cylinder engine featuring a larger TD04HL-16T turbo, re-designed manifold & intercooler just seen your wanted ad tc if you need all three would be easier to change complete this is just intercooler and maybe have fan.. but no rad a freind got that