SV: [ROVERNET - UK] Temperature sensor in airflowmeter

jan.tillberg at sqc.se jan.tillberg at sqc.se
Tue Nov 6 08:38:30 GMT 2007


Hi there Rovernetters!

Thanks for all your answers!

Now I've measured the resistance in the airflow meter with a good instrument and all values are OK (pin 6,8,9 and 27).  

I bought the engine this spring and the engine is renovated, but the EFI isn't. It has had an rough idle and runs hesitantly. It doesn't matter if I pull the accelerator a little or fully down, it always runs uneven. I'm quite sure it gets to much petrol. Undoing the contact to the cold start injector makes no difference. The throttle potentiometer does not give 4,2 volts as it should it's rather 3,5 v. I haven't remeasured all the values since I realised I had the wrong information (about voltage and resistance), but something seem to be wrong with the potentiometer or it's feeding - any clues?

The water temperature sensor (blue) gives the right values. The thermotime switch might not, but I don't now how it should work. The engine stops when the plug (BROWN) is disconnected. (It stops all the time on idle though).

The problems are getting worse especially after changing the regulator - at the moment the spark plugs are soaked and it doesn't run at all. It has run decently driving normally (50 mph) at occasions.

Kent! The ECU is numbered 4CU 84477D and the AFM is numbered 2AM 73243A. Iv've checked the soldering of the ECU transistors and the resistor pack - they seem OK. Are there any easy measurements that could be done to verify the ECU function?

I haven't done all the test I found on http://www.gomog.com/allmorgan/ljet/FlapperSystemcheck.htm

Since the engine did run but unevenly I did not check all the components, I thought it was a matter of adjustments. But I better check all the injectors and wiring etc.

Jan

-----Ursprungligt meddelande-----
Från: rovernet-bounces at lyris.ccdata.com [mailto:rovernet-bounces at lyris.ccdata.com] För Warwick Brooks
Skickat: den 6 november 2007 01:07
Till: rovernet at lyris.ccdata.com
Ämne: RE: [ROVERNET - UK] Temperature sensor in airflowmeter

What are the engine symptoms that you're seeing Jan?
The flap-type airflow meter has a habit of wearing out the contacts in the positions where the engine usually runs.

Warwick.

-----Original Message-----
From: rovernet-bounces at lyris.ccdata.com
[mailto:rovernet-bounces at lyris.ccdata.com] On Behalf Of jan.tillberg at sqc.se
Sent: Monday, 5 November 2007 10:53 PM
To: rovernet at lyris.ccdata.com
Subject: [ROVERNET - UK] Temperature sensor in airflowmeter


 Hi there folks!

I'm trying to get life into my 1988 Rangerover EFI V8 I've put in my 1973 3500.

I've measured the resistance between pin 6, 8 and 9 and they are faulty.
Then I measured the resistance in the temperature sensor and that was way wrong. At 0º it should give about 8-10 ohms but gives several 100 ohms. Are there any good substitutes for this sensor? Would it seriosly affect the running of the engine? Would it affect the resistance between pin 6, 8 and 9?

I would be happy for information on this!

Jan Tillberg Stockholm


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