Thread: V8 Discovery Lack of Power

Miss firing? and that would cause it to run on less cylinders therefore a lot less power. Had that problem with my 3.5 Rangy.

Anywhere from

fouled plugs .. dead leads ...

Open the bonnet in a dark garage & start the motor ... look for "Blue arking" from the spark leads

Mike

Mike,
Leads are only about 20,000 old (10 months old), plugs iridium have done about 12,000 - so I was thinking I could discount these as a cause.
Thanks,

Originally Posted by Slow Disco

Mike,
Leads are only about 20,000 old (10 months old), plugs iridium have done about 12,000 - so I was thinking I could discount these as a cause.
Thanks,

I would still look at em ...

If you have a Dizzy ... Dizzy cap for hairline cracks & then the rotor button

After that ... try a known good coil

I let car cool down with bonnet open for 1.5 hrs (33c outside), took for a burn around the block, car going fine. Wondering if there is a heat sensor which does something and once it gets hot it's failing??

Sounds pretty normal for a rover V8,

No power, goes chug chug chug














Fuel flow and ignition are the only controling factors really.

If your leads are good quality and good condition then look at your plugs.

Your plugs should tell you what the engine is doing.

Black wet and sooty = rich or burning oil = Rings, head gasket or any of the controling factors for your fuel mixture (O2 sensor,MAP sensor etc etc)
Brown/tan = lean = blocked fuel filter, line etc or fuel control again
dark grey/black dry = normal

Could be a number of inputs to the computer, not enough information to make a correct diagnosis

Only when hot sounds like the module on the dizzy...

Replace the module (cheap) and see how u go..

I doubt the iridiums are the issue, mine did 80,000 no issues...

Leads - unless spiral core.. Could be the problem...

Originally Posted by Tombie2

Only when hot sounds like the module on the dizzy...

Replace the module (cheap) and see how u go..

x 2 ... cool it down next it plays up ... and have a look at the rest in the mean time