W

watfordkev

New Member

• Jun 15, 2013

• #1

My P38 4.6 Vogue, 2000 on a W plate, 106k...

On an incline

• intermittently loses power - significantly -
• picks up power again 'when it feels like it' so to speak - nb does not over-rev but gradually picks up power again
• will not rev above around 3000rpm in these moments

Additionally

• The above issues only tends to happen going uphill
• The car never feels like it will stall
• There are no leaks
• The car starts, idles (and stops) very smoothly - no unwanted noise etc

I am going to submit it for physical examination with a specialist but I wondered if anyone here might have any advice / ideas? Thanks!

 

StuckAgainSteve

Well-Known Member

• Jun 15, 2013

• #2

Sounds like a knackered MAF or a poor connection to it.

 

Stufer

Well-Known Member

Full Member

• Jun 15, 2013

• #3

Yep or possibly coil packs, mine caused similar hesitation under load.

 

Datatek

Well-Known Member

• Jun 15, 2013

• #4

In tank pump?

 

T

TSC

New Member

• Jun 16, 2013

• #5

My 2000 4.6 did the same, it was leads and coil pack, changing these improved it a lot however it still did not rev as it should, changed MAF sensor and all was well.

 

StuckAgainSteve

Well-Known Member

• Jun 16, 2013

• #6

Also ensure the car hasn't been fitted with some sort of oil impregnated "sports" air filter like a K&N, the oil from it will kill the MAF. If you have access to any old cheapo OBDII reader that does live data - check the airflow values from the MAF at the revs specified in RAVE. You will also be able to see if the cats are lighting up causing the Lambda sensors to flip between high and low voltage. The other two Lambdas will show a constant voltage (.447V?) to keep the EMS happy as they aren't actually fitted! (AFAIK four Lambdas are only fitted to North American Spec cars.)

 

Last edited: Jun 16, 2013