North American Turbocoupe Organization



Base Idle? Bird Is popping bad
88Mach1TC Offline
Member
#1
Ok im trying to set my timing @ 10BTDC Im following these instruction.... and this is my result. My bird starts and fires but is popping real bad. Im clueless as to how to set base idle?
1988 Mach 1 TC "Amanda"

Cold Air intake, No BCS, MSD Coil
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firstsvo Offline
Senior Member
#2
Go to the FAQ page and look under tuning/maintenance. 3rd item down.
White '88 auto mostly stock, Black '88 5 speed nowhere near stock
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88Mach1TC Offline
Member
#3
I did all that and someone said i needed to set base idle? and even timed per the faq page my bird is popping real bad..
1988 Mach 1 TC "Amanda"

Cold Air intake, No BCS, MSD Coil
Reply

firstsvo Offline
Senior Member
#4
That's what I was showing you:

1- First bring the engine up to normal operating temperature

2- Turn the engine off and unplug the Idle Air Control. This is located on the backside of the Throttle
Body near the firewall. This device is a round cylinder approximately 5 inches long with a (2) bolt flange
and 3 wire male / female plug connector.

3- Using the small adjustable wrench adjust the base idle to 700 – 800 RPM

4- Locate the Throttle Position Sensor (TPS) on the Throttle Body. This is also located on the backside of
the Throttle Body near the firewall. This is a black plastic device with (2) screws that allows adjustment
and (3) wire male / female connector. Connect the voltmeter to the TPS and ground. The wire should be
the one with a green strip.

5- Using the small Phillips screwdriver adjust the TPS output voltage to approximately 1.0 volts. Most turbo
tuners find that setting your voltage to around .90 - .95 volts works best. I set mine around .94 volts.

6- Turn off the engine

7- With the engine off and the voltmeter still connected move the throttle linkage slowly from idle position to
wide open and back to idle, look for a steady increase and then decrease in voltage without any voids or
dead spots. Any voids or dead spots would indicate a faulty TPS.

8- Plug in the Idle Air Control

9- Start the engine. The engine’s idle speed should settle in around 1000 RPM

10- Take the Turbo Coupe for a test driv
White '88 auto mostly stock, Black '88 5 speed nowhere near stock
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88Mach1TC Offline
Member
#5
am i used the small adjustable wrench on the idle screw?
1988 Mach 1 TC "Amanda"

Cold Air intake, No BCS, MSD Coil
Reply

firstsvo Offline
Senior Member
#6
Yes. I think mine also had a slot for a screwdriver.
White '88 auto mostly stock, Black '88 5 speed nowhere near stock
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88Mach1TC Offline
Member
#7
what exaclt is 700 -800 on the screw? is in further on or backed out?.. god i cant talk tonight... i sound like a derka derkaspeaking engrish...

and i take it i adjust the screw with the engine on?
1988 Mach 1 TC "Amanda"

Cold Air intake, No BCS, MSD Coil
Reply

HOODBIRD Offline
Senior Member
#8
Its hard to say it took me 3 times to get it right. If u are looking at the tach maybe a quarter turn off the half mark between 0 and 1k

yes u adjust with iac plug out, car running. Make sure the car is warm at operating temp.

Goodluck just keep at it u will get it
86tc 5speed k&n, gfb boost controller, autometer gauges, tripminder, fmic, and upgrading as fast as possible
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firstsvo Offline
Senior Member
#9
Engine running, out lowers idle, in (cloclwise) raises idle. Turn a little at a time and watch the tach.
White '88 auto mostly stock, Black '88 5 speed nowhere near stock
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88Mach1TC Offline
Member
#10
it dies immediately after i pull idle air
1988 Mach 1 TC "Amanda"

Cold Air intake, No BCS, MSD Coil
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