Mud-club

Vehicle & Technical => Discovery => Topic started by: robert3003 on February 11, 2007, 16:52:45

Title: hesitaion at 3000 revs on v8
Post by: robert3003 on February 11, 2007, 16:52:45: hello, ive got a problem when i accelerate . if i put my foot to the floor i seem to get to around 3000rpm then the disco hesitates and wont go any faster even if i drop a gear. if i take my foot off the throttle then put it back down slowley it works fine again. this does not happen every time but happens regularly, just had a service done so its had new plugs so its not that, tried unplugging the airflow meter to see if that made a difference but if anything it was slightly worse, hesitating at lower speeds.have replaced coil pack and leads and crank sensor
rob

2000 4.0 v8i
Title: hesitaion at 3000 revs on v8
Post by: Eeyore on February 12, 2007, 07:57:13: Hesitates under hard acceleration?

Does it feel like it's trying to miss-fire at all when it happens?

Intrigued.

Cheers
8)
Eeyore
Title: hesitaion at 3000 revs on v8
Post by: robert3003 on February 12, 2007, 08:02:04: yes just like hitting a rev limiter
Title: hesitaion at 3000 revs on v8
Post by: Eeyore on February 12, 2007, 09:57:01: Quote from: "robert3003"
yes just like hitting a rev limiter

Ah. It could be hydraulic pump-up on the lifters. If it is, the cure is simple - change the oil for a good semi-synthetic. We had it on our 3.9 and changing the oil cured it. We'd been through the entire electrics trying to chase our problem down.

It's a more common problem than people realise (oil is one of the most important components in the engine). Not saying this will cure your woes, but it worked for us.

Has the motor get many miles on it?

HTH
Cheers
8)
Eeyore
Title: hesitaion at 3000 revs on v8
Post by: Range Rover Blues on February 12, 2007, 12:29:04: I can recomend that Lucas oil, I use it in mine and I can assure you it pulls like a train at 5,500 rpm.
Title: hesitaion at 3000 revs on v8
Post by: robert3003 on February 12, 2007, 13:55:21: what grade dide you use ie put in it 10 w40 as older engine should i have gone for 5 w30???
Title: hesitaion at 3000 revs on v8
Post by: Range Rover Blues on February 14, 2007, 13:39:53: I use 20w/50 in mine, the V8 likes thick oil as it doesn't move it that fast. Later big-bearing cross-bolted V8s can take it much thinnner.
Title: hesitaion at 3000 revs on v8
Post by: robert3003 on February 23, 2007, 09:52:21: iv at last sorted problem it was the maf sensor replaced this today and car goes like what a v8 should revs to 5500 and goes like a rocket . not sure the bank ballance is ready for the extra revving though !!!
Title: hesitaion at 3000 revs on v8
Post by: Skibum346 on February 23, 2007, 11:10:03: Congrats matey.. glad to hgear it wasn't terminal!
Title: hesitaion at 3000 revs on v8
Post by: Range Rover Blues on February 24, 2007, 12:00:30: Quote from: "robert3003"
iv at last sorted problem it was the maf sensor replaced this today and car goes like what a v8 should revs to 5500 and goes like a rocket . not sure the bank ballance is ready for the extra revving though !!!

I know that feeling well :roll: