North American Turbocoupe Organization



Lets see if you guys can solve this one??!!
Jeffrey Daly Offline
Senior Member
#1
OK...I was dealing with multiple idle issues as many of you know from previous posts. I replaced quite a bit. So at times....the idle will climb up to about 1500 rpm (at a stop light etc...). If I hit the fuel switch from premium to reg, the idle immediately goes down to about 900-1000 rpm.

It jumps down as soon as I hit the fuel switch. I have a Gillis valve so I thought that it would render the stock BCS null and void??? The electrical part is still conected.

No check engine lights at all....

ideas? thoughts?

Discuss.
1988 Ford Thunderbird Turbo Coupe 5 speed/ Gillis Valve/ 140mph Ford Motorsport gauge/ RAM Powergrip Clutch/ K&N Cone filter
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Tom Senior Offline
Banned
#2
Hi daily The octane switch also controls the timing by 4*. It also controls the boost if you have a solenoid. You do not so the boost is not an issue. Boost solenoid would not effect the idle anyway. You must do a minimum idle adjustment and do it correctly. Remember there is no idle screw on a 2.3. Hope this helps Tom Senior. Rolleyes
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Pete D Offline
Administrator
#3
The fuel switch influences timing as well as boost.

If, when the idle is high, you turn off the engine and restart, does the idle return to normal? Have you cleaned the IAC? Have you tested the TPS?
Pete Dunham


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avh Offline
Junior Member
#4
I may be a bit off the subject, Tom - you mentioned that the timing changes by 4° when the premium fuel option is on. What is the regular and premium timing settings at stock? I've seen that several people on the forum suggest changing the timing, what is the best setting?
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Tom Senior Offline
Banned
#5
It really depends on the boost you run. I usually run 12* up to 20 lbs of boost. Remember always remove the spout before timing. You probably already know that but i have got many a ford timed with the spout left in from other shops. Make shure you do a proper minimun idle setting and adjust the TPS after minimum idle setting. Stock with spout in and switch set to preamium 10* static switch in regular 6* static. This is the stock settings ford designed into the computer. Smile Tom Senior
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avh Offline
Junior Member
#6
thanks Tom I'll try it!!
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Jeffrey Daly Offline
Senior Member
#7
TPS is new and properly set. IAC is properly cleaned.
1988 Ford Thunderbird Turbo Coupe 5 speed/ Gillis Valve/ 140mph Ford Motorsport gauge/ RAM Powergrip Clutch/ K&N Cone filter
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TCx2 Offline
Senior Member
#8
So, are we saying here that it is crucial to ensure that the car is set to premium setting before setting the timing to the factory specified 10* with spout out?
Kevin
TCx2
67 Green Ford Fairlane 428CJ 5spd
89 Fiji Blue Chrysler Conquest
03 Mercury Marauder "Supercharged"
03 Ford Excursion(King of the SUVs)
04 Mustang Cobra - Screaming Yellow
10 Challenger R/T "Supercharged"
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Tom Senior Offline
Banned
#9
Once the spout is removed it makes no difference how the octane selector is set. The timing at this point is removed from the equasion and is set at static. Which is 10* BTDC. With the spout out the computer is out of the system. Big Grin
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Jeffrey Daly Offline
Senior Member
#10
So again...I guess my question is ...is the octane switch completely useless when the Gillis is hooked up? I just find it odd when the idle starts a slight climb and I hit the switch to reg, the idle goes back down where it should be.
1988 Ford Thunderbird Turbo Coupe 5 speed/ Gillis Valve/ 140mph Ford Motorsport gauge/ RAM Powergrip Clutch/ K&N Cone filter
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