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Something not right if you cannot get it to seal with new gaskets. Either as you said the downpipe is holding it or something is warped. Personally I don't like using any pastes or sealants if a normal gasket is required. It makes future work a lot more cumbersome.

For sure I would remove the manifolds from the car and check for cracks/straightness, remove all traces of gasket and reinstall with some copper grease, normal torque settings and the correct nut locking brackets. The nuts do back off in my experience so you will need to fit something to keep the nuts from going loose.
 

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Agree with the last - never used paste on a manifold, only ever on a joint. There's no reason why you'd need paste if the gasket is on properly. Once you've run it a while, nip the nuts back up. Don't over tighten - you'll kick yourself if something snaps.
 

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Discussion Starter #163
Manifold gaskets all installed you guys were right it was the down pipe pulling it off center. Upon tightening down all the bolts one felt like it was about to strip 🙄 wasn’t even tight! Isn’t a problem right now so will leave it for the time being.

I’ve started up the car and felt around the down pipes and have found a couple pinholes but still sounds quite loud so will do a more thorough inspection.

Took it for a run around the block and it still feels like it has that resistance during a certain rev range from the engine
 

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Just a thought is your vacuum advance working ok?
take the distributor cap off Then pull off the vacuum pipe from the plenum end pushes on the top behind throttle body and put a vacuum on it (you could suck on the pipe if you don’t have a vacuum tester) whilst doing this you should see the plate inside the distributor twist round a bit, if ok check the little nozzle on the plenum from where you pulled the pipe and make sure it’s clear not crudded up.
 

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Discussion Starter #165
Just a thought is your vacuum advance working ok?
take the distributor cap off Then pull off the vacuum pipe from the plenum end pushes on the top behind throttle body and put a vacuum on it (you could suck on the pipe if you don’t have a vacuum tester) whilst doing this you should see the plate inside the distributor twist round a bit, if ok check the little nozzle on the plenum from where you pulled the pipe and make sure it’s clear not crudded up.
Yep tried sucking on the vacuum advance tube and heard something moving in the distributor, nothing blocking up the pipe on the plenum chamber
 

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Discussion Starter #166
Took the Range Rover into my local Land Rover specialist and within 2 hours they had tuned the motor and discovered the thermostat was not working and therefore the motor was never getting hot. I replaced the thermostat a few days ago and took it for a run today. It was the first time I’ve ever heard the fan go which definitely says something, and the temperature gauge now rests in the middle and not at 1/3 how it used to be. It still runs like crap when cold though!! Sounds like it misses
 

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Check/test the temperature sensor, there are 2 together on right hand side of plenum chamber near the front of the engine one is thermotime sensor which controls cold start injector and other is temperature sensor for ECU this controls injector opening times etc for cold running, also check the wire colours on the plugs to them to ensure they have not been crossed over between the thermotime sensor and temperature sensor they will fit either I have found this before.
also check your extra air valve is working ok.
 

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Discussion Starter #168
Check/test the temperature sensor, there are 2 together on right hand side of plenum chamber near the front of the engine one is thermotime sensor which controls cold start injector and other is temperature sensor for ECU this controls injector opening times etc for cold running, also check the wire colours on the plugs to them to ensure they have not been crossed over between the thermotime sensor and temperature sensor they will fit either I have found this before.
also check your extra air valve is working ok.
Great thanks for your reply cortina. I have a photo of the wires here next to where the thermostat is but currently don’t have a photo of the other sensor wires with me. Do you know if this is correct? Sorry what extra air valve do you mean? I really appreciate your help, cheers
286527
 
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