18 replies to this topic

[tmarmsi]

Hi I'm at IMM so I don't have proper access to the forum (no fancy phone :-(
Lead you have is the best bet to be honest it the genuine Rover lead can have problems with.
If you have no communication under ignition power, there are several possibilities but most common is the wiring to the diagnostic plug, I would be checking this first as without being able to read the running data you will struggle.

FS

Yeah I did think it was strange that its works with engine turned off but as soon as I turn engine on it will lose communication, will work for a second or few then lose communication again everytime I try it.

Not being very good with electrics any ideas what I'm looking for? Or how to check? Furthest iv got is reaching behind diagnostic plug and locating the wires

Thanks

[FlyingScot]

MPi is sadly infamous for this as none of the cables are screened and everything is all jammed in.
Check the basics first, look for a good earth and continuity between the diagnostic plug and ECU pins.
A search on here will provide you with a PDF showing the PIN numbers... 😉

FS

Edited by FlyingScot, 04 August 2014 - 08:24 PM.

[tmarmsi]

Update
So iv managed to fix the communication error with my acr lead it now works fully while the car is running here are my readings below while running, if anyone can help me with the understanding of them, a few of them seemed to steadily rise which is why iv give 2 readings, the O2.volts.bnk was constantly changing numbers from 0.48 all the way to 3.33

R.p.m. 860-920
Map sensor. 39.0-41.4
E.c.t. 78-104
I.a.t. 59-75
Throttle position. 4.8
Throttle sw. Off
Battery volts. 13.9
O2.volts.bnk. 0.48-3.33
Coil 1 charge. T 1.58-1.60
Coil 2 charge. T 1.50-1.55
Injector 2 p/w. 0.97-1.05
Injector 4 p/w. 0.97-1.05
Stepper position. 43-46

The car has had a good service and iv checked for exhaust leaks and vacuum leaks iv changed the plugs, leads, oil, air filter, coolant temp sensor, air inlet sensor, and the cars emissions failed again did not change the readings one bit
My next thoughts are to get rid of the maniflow lcb and exhaust and replace it all back to standard along with a new cat to see if this will get them down, I'm at witts end here completely baffled!
Does anybody have any advice?
Thanks Tom

[sedmann]

sorry this isnt helping but ill keep checking up on this thread as my spi 1995 cooper sport has the exact same problems! im about to get to the manifold etc to all the sensors in the next few days and see if it passes on emissions once ive changed the lambda. already done all air wires/pipes etc. done everything me and my dad can possibly thing of! stressful. 7th time lucky hopefully. haha.

cheers, jack.