high idle . sputtering. searched!
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REDLINE JUNKIE
Joined: Feb 2009
Posts: 48
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From: Lake Stevens WA.
high idle . sputtering. searched!
i have searched the forums all week, im not to good at finding answers
ok i have a 93 fd that i just picked up,,,
mods are pfc, greddy intake and ic kit,
other then that its stock i think..
when i got the car it was not running because of wiring problems
and i have sorted all that out and changed the oil and filter, and checked all the other fluids. everything looks good so, i start it up and the idle is high.
it starts at 1400 and slowly climes to 2100 and stays at that high idle,
it makes a little popping sound from the tail pipe almost like a small consistent back fire. when the car is reved up it sounds good but will backfire sometimes and the idle drops to like 500 and tries to die, but if you give it a little gas it stays alive.
i understand that the idle may just be a vac leak or gasket leak.. so i will be checking for that today.
but the car dieing and back firing might be a part of a bigger picture that i just dont see:
any ideas?
http://www.youtube.com/watch?v=fdQPutjVes0
ok i have a 93 fd that i just picked up,,,
mods are pfc, greddy intake and ic kit,
other then that its stock i think..
when i got the car it was not running because of wiring problems
and i have sorted all that out and changed the oil and filter, and checked all the other fluids. everything looks good so, i start it up and the idle is high.
it starts at 1400 and slowly climes to 2100 and stays at that high idle,
it makes a little popping sound from the tail pipe almost like a small consistent back fire. when the car is reved up it sounds good but will backfire sometimes and the idle drops to like 500 and tries to die, but if you give it a little gas it stays alive.
i understand that the idle may just be a vac leak or gasket leak.. so i will be checking for that today.
but the car dieing and back firing might be a part of a bigger picture that i just dont see:
any ideas?
http://www.youtube.com/watch?v=fdQPutjVes0
If it's not a vacuum leak, it could be one of several issues. The PFC is well known to have high idles, sticking idles, or surging idles without careful tuning and adjustment of the throttlebody screws.
Download the factory service manual (available in the 3rd gen archive I think) and read pages F-79 through F-83 to get a little familiar with how the system works. Here is a basic description of it, from a 2nd generation technical manual:
If the screw is misadjusted, the cam won't separate from the roller. The same thing will happen if the coolant hose has been removed from the TB without removing the entire fast idle cam system. You could have too much air coming in due to the butterflys being held open from the fast idle system, and then even more air thrown in there by a poorly tuned power fc idle setup.
A stable idle requires a good tune, and usually the screw under the throttlebody elbow (between the lower two studs) needs to be tightened all the way in, then backed out 1/4 - 1/2 turn. That's usually necessary but won't solve the whole problem.
Download the factory service manual (available in the 3rd gen archive I think) and read pages F-79 through F-83 to get a little familiar with how the system works. Here is a basic description of it, from a 2nd generation technical manual:
If the screw is misadjusted, the cam won't separate from the roller. The same thing will happen if the coolant hose has been removed from the TB without removing the entire fast idle cam system. You could have too much air coming in due to the butterflys being held open from the fast idle system, and then even more air thrown in there by a poorly tuned power fc idle setup.
A stable idle requires a good tune, and usually the screw under the throttlebody elbow (between the lower two studs) needs to be tightened all the way in, then backed out 1/4 - 1/2 turn. That's usually necessary but won't solve the whole problem.
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