virtual non runner rover gauge errors 12, 17, 18.........

[MGB3405]

Further to the post below;

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

I now have a virtually non runner the rover gauge error codes are:

12 Airflow Meter
17 throttle pot
18 Throttle pot hi / Maf low

before I throw £400 at parts at it is there any advice?

[MGB3405]

Thanks Guys great advice very helpful as always

Now running (very badly) by fettling the Throttle Pot.

I have re-set the ECU and have the same errors occur.

Unplugged the AFM and it runs more or less the same. (drivable but sputtery (like rev limiter) except at high RPM))

Is there any way to test the AFM I have tried the voltmeter test as discribed on the ACT site

"Testing is performed in the following manner. Peel back the rubber boot on the airflow meter connector and leave it plugged in to the airflow meter. Set up the digital multimeter to read voltage. Insert the negative probe into the Red/Black wire (sensor ground), and the positive into the Blue/Green wire (Airflow signal). Turn on the ignition, but do not start the engine. The meter should immediately indicate a reading of approximately 0.3-0.34 Volts. Most defective airflow meters will overshoot to 0.5 Volts or higher, and take at least 2 seconds to come down to the correct voltage Now start the engine, and the reading should rise to 1.6 Volts (3.5 Litre engine) to 1.75 Volts (5.0 Litre engine)."

and I got no voltage at all so my assumption is it's buggered or am I missing something ?

not sure if I should bite the bullet and buy both or just AFM

[MGB3405]

Thanks Blitz

getting a bit out of my depth here, whats the best way to do the resistance check? and where does it ground?

I'm in Surrey, Staines area if any one can recommend somewhere reasonable to take a look for me?

[MGB3405]

Thanks Guys you have been a real help went and bought anew multi meter and:

Red/Black wire (sensor ground), and the positive into the Blue/Green wire (Airflow signal). Turn on the ignition, but do not start the engine.

showing 0.01 volts with very slight change with engine running

resistance between the Red/black (Ground- black probe) and Blue/Green (Air flow signal-red probe)

18.1 on the 20k scale

Red/black (Ground) to Brown Orange

12.1v

the red / black wire and the engine block

0.05v

Rover gauge shows a range of 12% - 94% on the throttle and no output on the MAF at any revs

So my guess is go and get a new MAF and keep my fingers crossed..........

[MGB3405]

Thanks everyone (your helpfulness never cases to amaze me)

Got a new AFM (not that easy) fitted in about five minutes all running fine now, need to get it hot over the weekend to see if original fault is still there fingers crossed...

Mark