NA wont idle

[lanciachris]

Hi, I managed to lose this site a while back, but hey, found it again now. To recap I have an 86 f3cs na that when i last stopped by was overheating (this looks to be due to a knackered viscous coupling, and remains unfixed, but ive not been using the car).

Anyway, to the problem I want to address first. The car wont idle and I have a shedload of vacuum hoses and openings flapping about since the air pump was removed. I suspect that some of this is responsible. Can anyone tell me what should be done with the vacuum hoses that were around the air pump when it is correctly removed?

[grinder]

yeah it ruins the idle once you remove the air pump

BUT

this also helps the water pump - so remove it can cause the water pump to slip hence the overheating

once the air pump is removed you should really run a dual alternator pully

you might need to block off the air pump pipes with corks until you can sort out what you are doing

Hope this helps

stu

[lanciachris]

Thanks. Ive replaced the remaining belt and made sure its correctly tensioned, will see if i can find a shorter belt for the other one.

By ruins the idle.. I mean \'it wont idle, the moment you let off it drops down to about 400 and dies\'. I assume even without the air pump it should be able to run without a foot on the pedal.

Some of the hoses havent been blocked off so I will try that. Thanks

[Brett]

By leaving all the air controll and bypass air control system open you are essentially letting unmetered air enter the system - if memory serves you need to blank off the control valves ports OR remove it entirely and make a proper blanking plate to go over the exposed hole in the upper inlet manifold.

[antnicuk]

as brett says,  block off all the open holes including any holes in the inlet duct between the air box and the throttle body (TB) as if it sucks in unmetered air the plunger in the air flow meter (AFM)doesnt get sucked in and the injectors dont fire.  

There must be vacume between the AFM and TB

[lanciachris]

Update -
I blocked off the stuff I could see, but to no avail.

Blocked off so far -
2 Pipes that head \'behind\' the top of the engine and around towards the spark plug side

Big hole in back of the airbox

The location where the air pump was is also blanked off.

Next step will be taking the air intake to bits to see what ive missed..... if anyone has any hints before I do that let me know

[Den]

Before taking anything apart buy a can of easy start and while cranking the engine spray it around the whole intake system, if there is a leak somewhere the spray will get sucked in and the engine should fire up.