rough running

[chiefmechanic]

I have a urs4 with a 2.2 20v aan engine. It has an mtm chip rs2 em 3" ss exhaust no cats bigger intercooler roughly 268bhp. Driving home last night the car died. It would start again but not continue to run below 1500rpm. I unplugged the maf and was able to drive it home but at reduced power. I have tried 3 different maf's all with the same part number but only one with an adjuster screw on the side. It will only run with the one with the adjusting screw but all throw up a fault code on vcds which I cant clear.

Address 01: Engine Labels: Redir Fail!
Control Module Part Number: 4A0 907 551 AA
Component and/or Version: 2,2l R5 MOTR.RHV HS D03
Software Coding: PMC 1
Work Shop Code:
VCID: 62CFE0CCEE6B6D0EE27-4A3A
3 Faults Found:

00553 - Mass Air Flow Sensor (G70)
07-00 - Signal too Low
00537 - Lambda (Oxygen Sensor) Regulation
11-00 - Control Limit Not Reached
00519 - Intake Manifold Pressure Sensor (G71)
17-00 - Control Difference

I cant really start fault finding till I clear the maf fault as it could be causing the rest of the symtoms.
What I would like to know is
Why will the engine not run with a good maf with the same part number. It runs better unplugged.
Is there a difference to a maf thats fitted to a rr or aby or aan engine.
Does a mapped ecu look for a specific voltage from a maf.
Thanks in advance for the replys and Merry Christmas

[Donald Smith]

Did you check for a hose which could have blown off?

Your car will not run if this happens.

[Tonks4x4]

Has one of you large boost hoses come off?

This would cause those symptoms


Tonks4x4 - The Land Rover Specialist

[chiefmechanic]

Boost hose

Will check that in daylight. Thanks.

[UrS4boy]

AAN boost leak testing

Will check that in daylight. Thanks.

On the AAN, unless you have upgraded to Samco silicone hoses, it is common for the corrugated rubber 034145720D "Michelin Man" cross-over to intercooler hose to get eaten by oil vapour condensing in the bottom of the corrugation valleys and then splitting at an inopportune moment (under boost).

This link should help you sort it out:http://www.s2forum.com/forum/showthr...t+leak+testing


Here is a diagram that might help too: