Aydena
Active Member
Morning all!!
I recently bought a 1994 Discovery 3.9i V8 auto, when i bought it i was told about the idle fluctuating...this has now turned out to be not only fluctuation but a full on issue !
When first starting cold the idle shoots up to 2k RPM then starts to settle to about 1k RPM and whilst idling ok you can feel the occasional stutter... As it warms up it gets worse and today whilst driving after first cold start it was spluttering and holding back quite badly... Also the idle is extremely lumpy and occasionally stalls. It also occasionally kicks out black smoke when pulling away.
However.... When its fully warm it occasionally will idle ok, the other times it idles low and lumpy and will cut out when put in gear.
One thing i have noticed is that the MAF sensor will make a loud whining noise which can be heard from inside, i have yet to determine wether this only happens when its idling badly, it was a brand new sensor not long before i bought the car. It has had this problem a while as I've got receipts for a new filter after it was discovered it had low fuel flow?
Does anybody have any ideas? I was thinking it could be a CTS issue? I cleaned out the air bypass valve which didn't change anything, it has new leads/plugs/cap and rotor arm, I'm gonna pop out a couple of the spark plugs to see what colour they are!
Cheers
I recently bought a 1994 Discovery 3.9i V8 auto, when i bought it i was told about the idle fluctuating...this has now turned out to be not only fluctuation but a full on issue !
When first starting cold the idle shoots up to 2k RPM then starts to settle to about 1k RPM and whilst idling ok you can feel the occasional stutter... As it warms up it gets worse and today whilst driving after first cold start it was spluttering and holding back quite badly... Also the idle is extremely lumpy and occasionally stalls. It also occasionally kicks out black smoke when pulling away.
However.... When its fully warm it occasionally will idle ok, the other times it idles low and lumpy and will cut out when put in gear.
One thing i have noticed is that the MAF sensor will make a loud whining noise which can be heard from inside, i have yet to determine wether this only happens when its idling badly, it was a brand new sensor not long before i bought the car. It has had this problem a while as I've got receipts for a new filter after it was discovered it had low fuel flow?
Does anybody have any ideas? I was thinking it could be a CTS issue? I cleaned out the air bypass valve which didn't change anything, it has new leads/plugs/cap and rotor arm, I'm gonna pop out a couple of the spark plugs to see what colour they are!
Cheers