How can I tell?
Thread Starter
Supreme Member
iTrader: (4)
Joined: Feb 2000
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From: Winston salem, NC
Car: 1987 1SICIROC.....1999 TransAm
Engine: 385 HSR.....LS1
Transmission: 700R4 with Midwest 3400 2.4str...M6
Axle/Gears: SLP Zexel Posi unit 3.42's...3.73's
How can I tell?
How can I tell if Im running rich?...I get no SES light. If I am, how can it be fixed?
I have an AFPR, do I just lower the preasure?....if it is set to high will that cause me to run rich and get bad gas mileage?..
I used to get about 280 to a tank and now I get way lower than that....
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wishmister@yahoo.com
1987 White IROC-Z
305 TPI LB9 273 Rear Gear
700-R4 auto tranny
97,000 miles
KYB's
Performance Resource Chip
Flowmaster Muffler
Ported/Polished Plenum by "Daniel Burk"
Holley AFPR
Throttle Body Coolant bypass
TPIS air Foil
TPIS MAT Relocation Kit
K&N's
Gutted air box
Accel 8.0 plug wires
Moroso Super Coil
Blue Streak Cap and Rotor
Boush Patinum +4's
Mobil 1 15/50 Synthetic motor oil
Mobil 1 synthetic Trans fluid.
I have an AFPR, do I just lower the preasure?....if it is set to high will that cause me to run rich and get bad gas mileage?..
I used to get about 280 to a tank and now I get way lower than that....
------------------
wishmister@yahoo.com
1987 White IROC-Z
305 TPI LB9 273 Rear Gear
700-R4 auto tranny
97,000 miles
KYB's
Performance Resource Chip
Flowmaster Muffler
Ported/Polished Plenum by "Daniel Burk"
Holley AFPR
Throttle Body Coolant bypass
TPIS air Foil
TPIS MAT Relocation Kit
K&N's
Gutted air box
Accel 8.0 plug wires
Moroso Super Coil
Blue Streak Cap and Rotor
Boush Patinum +4's
Mobil 1 15/50 Synthetic motor oil
Mobil 1 synthetic Trans fluid.
TGO Supporter
Joined: Aug 1999
Posts: 14,811
Likes: 1
From: Jackson County
look at the plugs. install a a/f gauge or an EGT gauge. you can read the voltage from the o2 and corralate that to rich or lean.
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ICON Motorsports
1st & 3rd
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ICON Motorsports
1st & 3rd
Moderator
Joined: Jan 2000
Posts: 19,683
Likes: 316
Wish,
You can also install a jumper in the ALDL AFTER the engine is running, allow the engine to enter closed loop, and drive it while monitoring the MIL/SES lamp.
If the ECM is in Open-Loop mode, the SES light will flash rapidly, about 2½ times per second. If it's in Closed-Loop mode, it will flash about once per second. When in Closed Loop mode, flashing less than once per second indicates the ECM is enriching the mixture above the 128 count base line. Flashing more than once per second indicates the ECM is leaning the mixture below the 128 base line.
If your light flashes faster than once per second, you're probably rich and the ECM can't compensate.
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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0
You can also install a jumper in the ALDL AFTER the engine is running, allow the engine to enter closed loop, and drive it while monitoring the MIL/SES lamp.
If the ECM is in Open-Loop mode, the SES light will flash rapidly, about 2½ times per second. If it's in Closed-Loop mode, it will flash about once per second. When in Closed Loop mode, flashing less than once per second indicates the ECM is enriching the mixture above the 128 count base line. Flashing more than once per second indicates the ECM is leaning the mixture below the 128 base line.
If your light flashes faster than once per second, you're probably rich and the ECM can't compensate.
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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0
Thread Starter
Supreme Member
iTrader: (4)
Joined: Feb 2000
Posts: 2,850
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From: Winston salem, NC
Car: 1987 1SICIROC.....1999 TransAm
Engine: 385 HSR.....LS1
Transmission: 700R4 with Midwest 3400 2.4str...M6
Axle/Gears: SLP Zexel Posi unit 3.42's...3.73's
If I am running rich, how can I fix it?....do I set my fuel pressure lower?
Moderator
Joined: Jan 2000
Posts: 19,683
Likes: 316
Wish,
There are a few things you can do, including reducing fuel pressure. But first you should find out if it is running rich. A clogged PCV can also cause rich idle/low throttle, along with a host of other things.
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Later,
Vader
------------------
"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0
There are a few things you can do, including reducing fuel pressure. But first you should find out if it is running rich. A clogged PCV can also cause rich idle/low throttle, along with a host of other things.
------------------
Later,
Vader
------------------
"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0