auto transmission startup

genpk · 23rd March 2017, 22:04

Got another Rover 75 doer upper as a project
Car runs perfectly, great motor and the auto changes are smooth and tight but when starting the car an interesting thing happens,almost feels like the car is slightly engaged in gear as in the car moves fractionly forward when cranking the starter, other than that it runs perfectly.
Ive owned a few 75 autos and not ever seen this before.

bl52krz · 23rd March 2017, 22:12

Solenoid problem? Needs fluid change?

Vanbursta · 24th March 2017, 07:19

Facing downhill?

mbonwick · 24th March 2017, 07:43

Possibly daft but have you checked the engine mounts? The movement of the engine as it fires up might cause the car to move slightly if the mounts are shot and don't damp it out.

Can't think what it would be gearbox wise - if you're starting in park, there's a pin engaged that locks the 'box so it can't rotate.

Does it creep if you just have it in neutral on the flat?

genpk · 24th March 2017, 11:36

Quote:

Originally Posted by mbonwick

Posin the engine bsuibly daft but have you checked the engine mounts? The movement of the engine as it fires up might cause the car to move slightly if the mounts are shot and don't damp it out.

Can't think what it would be gearbox wise - if you're starting in park, there's a pin engaged that locks the 'box so it can't rotate.

Does it creep if you just have it in neutral on the flat?

It does it on flat ground and have also thought about the engine mounts.
Only thing is when starting the car it starts perfectly,no bangs, clunks etc
Its not the lower engine mount as you would hear a knock when taking off
so maybe one of the mounts in engine, strange as the car runs so well

mbonwick · 24th March 2017, 13:11

Does it creep in neutral/park on the flat when idling?
Or is it only at startup that it moves?

genpk · 24th March 2017, 19:11

Quote:

Originally Posted by mbonwick

Does it creep in neutral/park on the flat when idling?
Or is it only at startup that it moves?

Only on startup,when cranking it almost feels like it's trying to move forward
slightly.
As said it runs perfectly otherwise.

klarzy · 24th March 2017, 19:13

i'd say one of the valves is letting bye slightly and or a binding clutch ring set...

Alan123 · 24th March 2017, 19:28

With those symptoms explained. First thing to check is the selector cable which is located under the auto box
There is a HOW TO on here to show how it's done ��

klarzy · 24th March 2017, 19:41

Quote:

Originally Posted by Alan123

With those symptoms explained. First thing to check is the selector cable which is located under the auto box
There is a HOW TO on here to show how it's done ��

If the selector cable was off would the inhibitor switch not prevent cranking?

23rd March 2017, 22:04	#1
genpk Posted a thing or two Rover 75 Saloon MGZT Join Date: Jul 2012 Location: Perth, AUSTRALIA Posts: 1,664 Thanks: 3 Thanked 461 Times in 299 Posts	auto transmission startup Got another Rover 75 doer upper as a project Car runs perfectly, great motor and the auto changes are smooth and tight but when starting the car an interesting thing happens,almost feels like the car is slightly engaged in gear as in the car moves fractionly forward when cranking the starter, other than that it runs perfectly. Ive owned a few 75 autos and not ever seen this before.

23rd March 2017, 22:12	#2
bl52krz This is my second home Rover 75 cdt club + Rover 2.5 KV6 Conni SE Join Date: May 2008 Location: Birmingham Posts: 11,396 Thanks: 6,587 Thanked 2,262 Times in 1,729 Posts	Solenoid problem? Needs fluid change? __________________ Great Barr, Birmingham.

24th March 2017, 07:19	#3
Vanbursta Posted a thing or two Rover 75 2.0 V6 Conn Join Date: Apr 2007 Location: Stainton Grove Posts: 1,637 Thanks: 266 Thanked 406 Times in 257 Posts	Facing downhill? __________________ I am NOT a number, I am 75

24th March 2017, 19:13	#8
klarzy This is my second home none but not gone Join Date: Mar 2013 Location: March, Cambs Posts: 16,437 Thanks: 894 Thanked 4,247 Times in 3,025 Posts	i'd say one of the valves is letting bye slightly and or a binding clutch ring set... __________________ [SIGPIC][/SIGPIC]….All praise Bananaswan….

24th March 2017, 19:28	#9
Alan123 Posted a thing or two Rover 75 saloon Join Date: Oct 2013 Location: Darlaston Posts: 1,897 Thanks: 484 Thanked 325 Times in 261 Posts	With those symptoms explained. First thing to check is the selector cable which is located under the auto box There is a HOW TO on here to show how it's done �� Last edited by Alan123; 24th March 2017 at 19:31..

24th March 2017, 07:43	#4
mbonwick Gets stuck in Connoisseur SE 1.8 Auto Saloon Join Date: Jul 2015 Location: Kendal Posts: 633 Thanks: 129 Thanked 176 Times in 147 Posts	Possibly daft but have you checked the engine mounts? The movement of the engine as it fires up might cause the car to move slightly if the mounts are shot and don't damp it out. Can't think what it would be gearbox wise - if you're starting in park, there's a pin engaged that locks the 'box so it can't rotate. Does it creep if you just have it in neutral on the flat?

24th March 2017, 13:11	#6
mbonwick Gets stuck in Connoisseur SE 1.8 Auto Saloon Join Date: Jul 2015 Location: Kendal Posts: 633 Thanks: 129 Thanked 176 Times in 147 Posts	Does it creep in neutral/park on the flat when idling? Or is it only at startup that it moves?