Rover V8 bad starting - cheap and easy fix!
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- เผยแพร่เมื่อ 9 พ.ย. 2023
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Brilliant working through logically.....not to mention your knowledge of how the V8 oil pressure switch is used as a 'damage limitation device'!
Thanks for that!
The ‘dodgy wiring’ whisperer strikes again! Genius work!
I remember my father cussing about this switch when his V8-S would not start outside a shop, he got out of the car lifted the bonnet his arm disappeared down into the engine, then it started! My own SD1 cut out on the motorway one day and the AA came out and bypassed
the switch! I bought a Ford Granada after that!
I think a lot of these 3.5 V8's have all but disappeared in cars and Land Rovers. Enthusiasts will probably know of this issue, but I had quite forgotten about it
On the ball early bird 👍👍
Mike your brilliant a dying breed
I try my best!
Pity you didn't remember about the oil switch earlier, I have never heard that before. But running now, I was never a big fan of the thermostatic chokes, we had a lot of trouble with them on ford escort, sierra, cvh engines. People used to put manual chokes on them, I've had a p5b and a discovery V8, possibly because I'm British, I cant understand swapping s.u. carbs, for a holley. Probably as easy to fit the rover V8 fuel injection. Keep up the good work 👍
I have heard the Holley is not as good as the Webber for the V8
Yes, you are right I never would’ve guessed. You did a hell of a job on that one.
Excellent bit of detective work Mike. I didn't know about the fuel pump being linked to the oil pressure switch. Fortunately mine is still good but first place I'll check if and when.
Would have helped if I would find a wiring diagram for it!
ooooh. Now i have to go back to the old Rangey (range rover) V8 that im looking at buying. It wouldnt start either.
You are brilliant Mr Mike!
Cheers for sharing.
Go for it!
I've always said Mike is incredibly "switched" on...
Excellent. I had a similar problem on the 101 FC V8 twin carb. The military redudant systems installs a 3 way oil pressure valve wich woun't let the pump work if there is no oil pressure, except on first start that fuel pump works directly from ignition. Those valve switches use to fail often and sometimes we want to start the engine and there is no run.
The101fc has a system to allow the enemy to get you, just what you need when you are trying to drive off in a hurry when you are getting shot at!
A far cry from the disco 2 set up 😂
Had this happen on a forward 101control started to be intermittent oil switch disconnected it and wham off we go changed it when it started years later to weeping a bit of oil for a new one but
Rolls-Royce Shadows and Spirits along with Jaguar has the same idea but with a different switch.
If it's the same as my v8 sd1 - when the car is cranking it turns pump on. When started it allows pump to work when oil pressure is good via that switch.
Do you happen to have a wiring diagram for the SD1?
@@BritannicaRestorations yes I have one. Will get it over to you
That beggar caught me out before now
Lucas, prince of darkness…..my diesel Perentie reversing lights are linked to oil pressure sender also…must have been an old bugger with oil pressure fixations heading up the wiring department for a few decades…..
Regardless of choke butterfly open or close, you should still get the engine to kick on fuel provided by the accelerator pump stroke. I reckon the oil pressure switch circuit has also been used to kill the ignition and the fuel pump, therefore no start regardless of fuel or not.
Just the fuel
Same switch on Honda generators. Probably metric though.
Yes same idea
Never knew about this. Would my 1984 V8 have this.
And would it affect staring when hot? Mine always struggled after standing for 20 or so minutes.
Anyway I prefer my 300Tdi.
Thanks again for the great video Mike.
Most likely
Are you running a square bore four barrel carb? (Edelbrock or Holley), if so your problem is probably down to the fuel boiling in the carb when you switch the hot engine off. What happens is that the fuel boils but the vaporised fuel is heavier than the air in the manifold, so the fuel vapour 'pours' into the manifold and when it eventually cools down it turns back into liquid fuel, this floods the engine. (Hence black smoke when it does start). The cure is a proper insulator between the carb and the manifold. (Not one of those crappy ones made of several sheets of thin aluminium and base gaskets).
Excellent Mike! Is this for all defender V8 carb? Because I asked my mechanic and he said that the oil pressure switch has nothing to do with the fuel pump. Also if we disconnect the oil press switch the engine will start up normally. I will ask my electrician and see.
I am asking because if I havent move the car for a few days it takes few seconds to fire up with choke on and thought if the switch is not working properly. When ignition is on I hear the fuel pump though normally.
On the carb engines, the oil pressure switch cuts the fuel pump if there is no oil pressure
Nice one!
Thanks!
Do you still have that Disco 1 in your yard? Perhaps it has the same oil pressure switch that you could salvage.
Will be here tomorrow
www.amazon.ca/gp/aw/d/B0066SL9MS?ref=ppx_pt2_mob_b_prod_image
@@BritannicaRestorations Indeed an easy part to get
There must be a lot of problems with them!
I wonder if that also applies to 3.9efi ?
Not sure
@@BritannicaRestorations Worth keeping in mind if it does'nt start.
3.9efi has a delayed injection on start built in to allow oil pressure to build up
@@jonatday Nice to know, thanks.
Wow! One coold look for ages trying to figure out why no fuel of you didnt know the system!? Clever safety system but you got to know that one.
Exactly!
With a capital A, what an Arse😂
Like you thinking..
Sneaky switch! I’ll stick with my 300 Thankyou