1997 Range Rover running rough

WILLHIND

MEMBER
1997 ROVER RANGE ROVER
V8
4WD
AUTOMATIC
127,000 MILES

Hi. Ive just had head gaskets replaced on my 4.6 since its been put back together it started at the turn of the key but after idleing for 15 mins or when it gets hot it wont rev up it keeps coughing and farting on. We have changed the cats when its cold it runs perfect evn revving its just when it gets hot it starts coughing and farting again any ideas. Weve put it on the diagnostic machine but it comes up with no faults

Sunday, November 1st, 2009 AT 12:20 PM

1 Reply

DR LOOT

MECHANIC
2,311 POSTS

I think when you're mechanic did the head job, He may have forgotten to connect the temperature sending unit, or it got damaged during the head replacement, the reason I think that is, the temperature sending unit controls the fuel mixture at cold temperatures and hot temperature, as you described. It runs just fine when it is cold due to the fact that the computer is running a rich mixture, when the vehicle warms up the computer should lean out the fuel mixture According to the temperature, and because when the vehicle is hot it sounds like it's running rich, That might be caused by the temperature sending unit.

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Thursday, November 5th, 2009 AT 10:15 AM