Thread: AUTO TRANS PROBLEM

Originally Posted by Patrick M

Hi all,
I have just got back from a trip covering the Warren River area with my 1986 RRC.
It was a great trip excepting for the fuel consumption which was on one particular leg nearly half of what it should have been.
I payed a good deal of attention to as many aspects of the mechanical operation of the car that I could while driving and it soon became obvious that the auto was not locking up in fourth gear.
I have a couple of ideas as to what might be going on but would like some input from you blokes which may help me pin point the problem.
I have plans of up grading the engine and auto trans in the future and was hoping that there may be a quick fix to this problem while waiting for the new mods to be sorted and ready to go in.
Regards:-
Patrick M.

Sorry All,
That first thread should have been "used nearly twice the fuel that it should have". "DOH"

G'day Patrick,

Might be your MAF sensor. I'd not that up on the earlier injection but when I forgot to plug my MAF back in after an air cleaner change on my 95 Classic it had your symptoms.

How much fuel did it use? If your thinking 20L/100km is twice what it should use ....................... You might be in for a fright

Originally Posted by DoubleChevron

How much fuel did it use? If your thinking 20L/100km is twice what it should use ....................... You might be in for a fright

Bahahah yeah..... i was lucky to get 400ks a tank in the D1 going to port Macquarie. Thats with the A.C off also
Cheers Jim

AFAIR the lock up on a 4hp22 is controlled by the governor within the transmission.

If the governor is dirty, again AFAIR the symptoms include lock up and that the first change from 1 to 2 on start up is delayed .
You could try to replace the filter and flush the transmission but I believe that this is rarely successful.

If the transmission was locking and you lack of economy was from other sources, check that the hand brake is not dragging ( have you adjusted recently?) , that the temperature sender to the ECU is reading correctly at 300ohms on hot engine. With an 85 you have a flapper and they would be pretty worn by now but check whether it opens smoothly. Also the cold start injector may be drooling so maybe isolate it from the injection .
Regards Philip A

Originally Posted by PhilipA

AFAIR the lock up on a 4hp22 is controlled by the governor within the transmission.

If the governor is dirty, again AFAIR the symptoms include lock up and that the first change from 1 to 2 on start up is delayed .
You could try to replace the filter and flush the transmission but I believe that this is rarely successful.

If the transmission was locking and you lack of economy was from other sources, check that the hand brake is not dragging ( have you adjusted recently?) , that the temperature sender to the ECU is reading correctly at 300ohms on hot engine. With an 85 you have a flapper and they would be pretty worn by now but check whether it opens smoothly. Also the cold start injector may be drooling so maybe isolate it from the injection .
Regards Philip A

Thanks Phil,
Changing from first to second is ok. I will check the H/B. I recently checked through all the sensors and everything was ok but will go over them again. I have changed the Flapper type injection to the hot wire system.

Originally Posted by LRJim

Bahahah yeah..... i was lucky to get 400ks a tank in the D1 going to port Macquarie. Thats with the A.C off also
Cheers Jim

How about 3.25Klms Per Litre on one leg.

Originally Posted by Patrick M

How about 3.25Klms Per Litre on one leg.

Yeah thats sucks worst ive had is 175 ks to 80ltrs. After fixing the vac advance and a re tune it helped quite a bit.
Dont forget you have a tired old 86 flapper, if you got 3ks per litre on just one leg id say your on a winner alreadyI'd expect that all around on a 30 yr old rover.
Cheers Jim