3.0 capri revs
3.0 capri revs
hi , my 3.0 automatic keeps reving up and down when in drive or any other gear with the brakes on at standstill as it is ticking over, yet when its in nuetral gear it ticks over ok and the needle on the the rev clock stays still on tickover at around 800 rpm i find this strange as it only does it when in gear only . it revs from 600 to 800 rpm up an down a few times and then stops and sits at 600rpm after about a minute or two . does anyone now what causes this problem .
Re: 3.0 capri revs
i found out what the problem was after all , i ran it up to temp and when i put it in drive i could hear a sissing noise coming from the breather pipe that goes into the drivers side rocker cover to the inlet manifold , then when i put it in park again the sissing noise stopped , so i then ran it with the air box off and went and put it in drive again and the revs stayed still at 600 rpm . then with the airbox off i took the pipe off that goes to the vaccum moter up to the heat sensor and gave it a blow and it was blocked with loads of dust and crap i then reffited the airbox and it was ok in drive at tickover so this pipe that was blocked is what was causing the revs to go up and down in drive must have been years of crap getting in the pipe from the inside of the airbox its all ok again and sorted.
- pbar
- Posts: 7532
- Joined: Thu Jun 07, 2012 6:29 pm
- Car(s): Capri 2.0 Laser, frequent driver.
- Location: North-West
Re: 3.0 capri revs
Glad you got it sorted, but you were relieved. Thanks for posting the solution.
Re: 3.0 capri revs
yes i was mate you wouldnt think a blocked pipe would cause the revs to go up and down in drive only, must be that the carb and engine needs a good supply of air to breath better on a auto under load in gear when the revs drop down in drive with the brakes on . i dont now what the vaccum moter on the air box does but with this pipe unblocked it must have allowed air from inside the airboxes heat sensor escape back down the pipe back down to the vaccum moter making it breath better for a guess .