Vehicle & Technical > Range Rover

'Missing a beat' every 6 or 7 seconds

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Big_Nige:
3.5 efi (flapper i think) 89' RRC, auto with no mods i can see. Whils't driving I get a 'miss' for a second or so. The previous owner had had the dizzy replaced, all the leads, the coil,  the plugs all to no avail. To be honest it doesent feel like ignition to me, it feels like momentary fuel starvatiion, but I could be wrong? Anyone got any ideas?

Ta

Nige

Range Rover Blues:
If you're happy it isn't ignition then try the fuel pump and or pressure reg.  Start with the fuel pump wiring.
Have to admit it's one of the things I keep putting off with ours, runs fine on LPG but on petrol it pulls like a train but won't cruise, I have been told it could be a weak pump, and given the age it's not a surprise.

Big_Nige:

--- Quote from: "Range Rover Blues" ---If you're happy it isn't ignition then try the fuel pump and or pressure reg.  Start with the fuel pump wiring.
Have to admit it's one of the things I keep putting off with ours, runs fine on LPG but on petrol it pulls like a train but won't cruise, I have been told it could be a weak pump, and given the age it's not a surprise.
--- End quote ---

 This will idle ok all day with no missing, once it needs the petrol it does the missing, i also noticed it doesn't do it whilst cold??? Is the pump in the petrol tank or is that just a lifter/primer pump? I'll have a look after i get the welding done!!!

Merlin:
Nige, did you get your mis-fire sorted?, mine does the same so I am wastching with gr8 interest--Tony

Range Rover Blues:
When cold the EFi over-fuels the engine to act as choke, or on the 3.5 EFi you have an extra injector, either way it runs rich so when cold the problem is not as bad.  Spoke to a guy who had very similar probs to me and cured it with a new pump, have a S/H tank to fit but every time I lift a spanner it rains.

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