Vehicle & Technical > Discovery

V8i misfire

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Friskydisco:
Thanks for that, the dizzy cap, leads and plugs were done just before i got it, know the bloke well and no reason to suspect issues but i will check everything on sunday, cheers.

Range Rover Blues:
Rotor arms, if it's got a rivet in the middle of it then it's probably s***, even if it came from Halrfrauds like mine did.

Dizzy cap, take it off and look at the terminals inside.  They should be starting to burn slightly (they are white metal) but if you see one that is less burned then that one missfires. That's what my LSE was doing, and trust me, with a V8 you won't notice 1 cylinder going down unless it's under load.

If you intend to try and find out which cylinder is missing with the engine at idle, try unplugging the injectors, but you need to do 2 before you really notice the revs drop.

Another test is to check the temp of the exhaust stub next to the head, to see if one is cold.

Plugs want to be BP6ES or equivelent in a 9.35:1 CR engine.

Check the leads don't light up, indicating internal damage or cross arcing, check also the lead routing, it's critical.

Do a compression test.

Does your exhaust 'chugg' or is it a smooth tone?

Are you loosing any coolant?

Friskydisco:
Not had chance to have a look yet but plenty to go on there, cheers.

gtomo2:
Just sorted a misfire out on mine. It was the tourqe head screw thet holds the vacum housing on the dissy was loose. just tighten it up and all is well. so have a look at that  and see if the vacum housing moves . As that will cause a misfire

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