Fluctuating idle - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

347 · 11-06-2004, 00:45

When I start the car and turn down the idle to around 1000rpm, it slowly moves up to about 1200 then down to 500 then back up and so on, Any takers on what cause's this?
When the revs are picked up to 2000rpm's it just stays there.
Keep in mind I have not set the float level yet.

EvilChief · 11-06-2004, 00:59

what engine? from ur nick i assume its a stroked 302w ...

also i assume its carby .. is that correct?

BLKEBXR8 · 11-06-2004, 01:21

Quote:

Originally Posted by 347

When I start the car and turn down the idle to around 1000rpm, it slowly moves up to about 1200 then down to 500 then back up and so on, Any takers on what cause's this?
When the revs are picked up to 2000rpm's it just stays there.
Keep in mind I have not set the float level yet.

Take the air cleaner off & check to see if the boosters are dribbiling fuel whilst idling if so float level to high or foriegn body stuck in the neddle & seat.
Possible cause of problem

347 · 11-06-2004, 01:22

Yes on both counts

BLKEBXR8 · 11-06-2004, 01:39

Quote:

Originally Posted by 347

Yes on both counts

Pull out neddle & seats blow out put back in (use a smear of rubber grease or Vaso on O-ring before putting back in ) Then set float level as metioned in other post.

xpc66 · 11-06-2004, 16:05

Sounds like incorrect idle mixture. Could also be leaking manifold gasket, leaky carby spacer, vacuum hose missing, clagged PCV.

krankieone · 11-07-2004, 03:38

Quote:

Originally Posted by xpc66

Sounds like incorrect idle mixture. Could also be leaking manifold gasket, leaky carby spacer, vacuum hose missing, clagged PCV.

Good call sounds like the problem I had when I first got mine back togeather

But I'd Adjust the carby first then check for vacume leaks.

347 · 11-11-2004, 02:34

Ok I had a bit of a play with the float levels. :?

I turned the front nut one 360deg rotation and the rear 360deg rotation in the opposite direction(given that the rear was too high and the front too low, in poor light it looked like they had changed slightly ) and I also screwed in both idle mixture screws untill they seated and then screwed them 2 full 360deg turns out.

Now at 1000rpm idle it only fluctuates about 300rpms.
Bring back the webers !!!!!!

Am I on the right track?

Racer · 11-11-2004, 17:28

You can just take pot luck guesses!!!!!!!!!! And i've never needed to adjust a float more that one flat- never a complete turn. Your idle screws are out way too far as well. I suggest you send it up to C&V and get them to sort it out for you.

11-12-2004, 01:34

Check your fuel pressure, not too much..... 4-5 psi is heeeeeeps for carb needle and seats