Arkade Posted July 31, 2013 Share Posted July 31, 2013 Hi all, I'm running a 2.0 GT/E Manta B engine in an A and it seems to be running pretty smoothly apart from one hiccup. I've found that after going down long downhills, upon baking to a stop, she won't catch the idle and stalls. As I said before, this only seems to be after a long downhill so I'm pretty sure gravity must be having some sort of effect on something. Anybody got any ideas? Quote Link to comment Share on other sites More sharing options...
madmantamik Posted July 31, 2013 Share Posted July 31, 2013 are you running it on the fuel injection or on carbs. i had a similiar problem not long ago on a jeep ,the air box had been replaced for a k+n filter which was allowing more air flow, the original inlet piping is designed to offer ram induction this was allowing the mixture to go weak on closed throttle freewheeling down long hills. i took the k+n off fitted a factory air box and the problem went. Quote Link to comment Share on other sites More sharing options...
Arkade Posted August 1, 2013 Author Share Posted August 1, 2013 It's injection with the factory fitted airbox. Thanks for the info. Quote Link to comment Share on other sites More sharing options...
paulmanta Posted August 2, 2013 Share Posted August 2, 2013 Fuel tank does not contain a swirl pot in an A, so maybe you are suffering low fuel pressure because the pump is sucking air, does it do it going up long hills ? best thing is to get an suitable fuel pressure gauge plumbed in and watch what it does on hills. Can you hear the pump racing at all ? Quote Link to comment Share on other sites More sharing options...
Arkade Posted August 3, 2013 Author Share Posted August 3, 2013 It seems to be fine up hills. However, the fuel pump does constantly whine which I assumed was down to it being duff. This might actually be my issue, thanks Paul! Quote Link to comment Share on other sites More sharing options...
mantadoc Posted August 3, 2013 Share Posted August 3, 2013 You're all overthinking it. I would say sounds like: 1) Car is a little lean 2) Idle is a little low 3) Brake servos let air into the inlet manifold, long slopes = sustained braking and constant air into the manifold through vacuum hose. 4) That means less air flows through afm so less mixture hence stalls 1 Quote Link to comment Share on other sites More sharing options...
cam.in.head Posted August 3, 2013 Share Posted August 3, 2013 to prove the no swirl pot in tank theory just fill tank up & see if its ok then ! Quote Link to comment Share on other sites More sharing options...
cam.in.head Posted August 3, 2013 Share Posted August 3, 2013 also to confirm the servo fault theory see what happens when youre all warmed up & idling.pressing the brake pedal may change the idle speed.it should only do this whilst you are actually MOVING the pedal down.it should not cause any air to leak whilst pressed or released.ie the servo only needs to refil with vacuum when it needs it ! Quote Link to comment Share on other sites More sharing options...
Arkade Posted August 5, 2013 Author Share Posted August 5, 2013 Ok I'll give it a test. I'm fairly sure it's not the brakes as I engine break for most of the hills but I'll give it a test to make sure. Appreciate the suggestions guys. Thanks. Quote Link to comment Share on other sites More sharing options...
mantadoc Posted August 6, 2013 Share Posted August 6, 2013 Splits on idle control valve pipe and flexy boot are popular air leaks as it the age old, push plenum down revs drop, pull up revs rise, inlet / exhaust leak Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.