Well that's about the list of things that are wrong :) However I think it's all related.

 

Car has now started to stall when pulling up to junctions, but also when pulling away from roundabouts.

 

When coming off a mini roundabout tonight I was accelerating gently and all of a sudden it was like I'd taken my foot off the accelerator, no revs and car started slowing. Tried pressing accelerator but nothing it was like it was disconeccted, car just slowed and stalled.

 

Tried to restart but would just turn over, wouldn't catch. Left it for a while, and the immobilisor came on, so turned the key, plipped the fob to turn the immobilisor off and car started first time. Drove home veeeeerrrrry carefully as had to make it through the Blackwall tunnel, *****c*s was I getting stuck in there :)

 

Any way no problem on the way home, but the car has now done this four time in two days and it's incredibly frustrating. The throttle problem has occurd at various speeds, changing gear normally sorts it for some reason. The stalling is new, and strange coz it starts first time before setting off. Each time it's stalled I've had to wait for the immobilisor to come on before being able to restart it.

 

HAve done some searching, I don't think it's the alarm (Clifford G5 proffesionally installed last year) just don't know why the immobilisor going on then off would help it.

 

Any help would be much appreciated guys and gals.

 

Thanks.

Most immobilisers have 2 circuits for the immoblisation (4 wires), I know its a bit hands on but if you can locate those wires and join the 2 pairs together that will eliminate the system.

Immobilisation circuits normally split fuel pump and ECU +power feed. (not normally higher than a 15 amp circuits, majority are 10 amp).

Hope that makes some sense iam sure someone on here would have a wiring diagram they could email to you.

I know what you mean, thing is I don't think it's the immobilisor, can't really f*ck about with it either as I don't want to void the warranty. I think allowing it to come on resets the fuel pump or something, after diggin around I'm leaning towards the MAF being the problem. Also the engine struggles before cutting out, rather than just suddenly stopping as would be expected with the immobilisor cutting in.

 

Problem with most of the threads on here about problems is no one posts up how they sorted it. SO if any one can make any more suggestions and I solve it I promise to let everyone know! :)

If it was the MAF you can check it by unplugging it. It will then be stuck at under 2200revs (think thats how much?) as it goes into limp home mode. It will be fine under those revs, and then get jumpy and limited as it reaches the limit. It doesn't seem like a MAF from what you have described.

Maybe try a different PTU?

Don't have a spare PTU unfortunatly, just had a look and it's a series 2 PTU, these are supposed to be really reliable right? Don't fancy spalshing out on a new one if it's fine. I'll have a go at cleaning the connectors on it and the MAF/CAS, see what happens then.

 

As for the MAF, am I right in thinking that if it IS working then the revs won't be stuck under 2200 when I unplug it? Is that right?

When the MAF is unplugged you get a comlimentary 2500rpm rev limit courtesy of the ECU whether it was working or not

Clifford alarm? I'd be pointing the finger in that direction TBH....

Clifford alarm? I'd be pointing the finger in that direction TBH....

 

Yeah thought about that, but a fault with that wouldn't cause the lack of acceleration surely? No other problems with the alarm/immobilisor. The stalling at junctions sounds like the common fault alot of people have posted up about.

 

It's on the list though cheers for the help!

Just thought, does it have blackjack?

No doesn't have blackjack. Just standard G5 450 (I think it's 450, one below the top spec 900 anyway.

 

If I'm quick enough I can jump it if it stalls while rolling by lifting clutch, just runs sh*tty and then stalls again.

Right, just went out and had a look at the PTU, MAF and CSU. All the connectors look fine, no corrosion. Tried disconnecting the MAF and the way the car revs with it disconnected was how it was acting at the weekend. So cleaned the plug and sprayed a bit of WD40 on the connectors just incase.

 

Just took it for a drive, only round local roads, and it now stalls everytime you brake hard, like it was doing before, but it starts up again alot easier, no need for immobilisor to kick in.

 

Would this mean a fault with the MAF? Still stuck as to what it could be!

Electrical switch cleaner would proberbly be better than WD40, WD40 could cause the connector to short, which has happened to me before.

As promised: an update!

 

Firstly would like to say thanks to Mark for doing a Conzult test for me, would have been lost without your help mate!

 

Well, the Conzult check threw up a fault with the MAF, so a month later and I have just fitted the new MAF and after two test drives of an hour each (three hours apart just to check!) the car would seem to be running alot better. No hesitating, stalling as slowing down etc. Throttle response feels alot smoother as well now. So, fingers crossed :)

 

Going to book the car in with Nexus (after hearing good things about them and Redline) for a service so if anything else crops up I'll add it on here.

 

Hope this helps someone at some point!

Sorry for dragging this old and boring thread but just thought it needed some "closure" :)

 

Took the car down to Nexus performance in South End on Monday for a service. As part of the basic service, Scott did a complete check of the whole car and made a list of things that needed attention/could be better, and made some recomendations on where to go from there. Even took some pictures of some of the parts under the car.

 

Car still stalls sometimes so will be fitting a new set of spark plugs soon, and he also spotted an issue with some poorly fitted braided brake lines that could be nasty, and should have really been spotted at the MOT.

 

Above all I'd just like to say how impressed I was with the service from Scott. He's a geniunely nice guy and enthusiast, owns a stunning Zed (and a pretty nice Gloria as well!) and was happy to chat for a good 45 mins about the car and random car stuff. I know some other people here are having work done there and would highly recomend him to any one in the South East looking for a good garage.