89 Formula 305 TPI Issues
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Junior Member
Joined: Nov 2012
Posts: 5
Likes: 0
89 Formula 305 TPI Issues
Hello guys,
I have a 89 formula 305 5 speed that runs great when cold but sounds and feels like it is missing when engine is warm. During driving when fully warmed up, I can push the gas to the floor and the car just stutters. When the engine is cold it runs good with a lot of power. I Checked the timing and it was at 12 with the ECM jumped. I set the timing to "6" per the manual and the car runs even worse. I have checked all vacuum lines. Does anyone have any ideas on the fix for this? Here is a List of parts that I have replaced.
TPS Sensor
Oxygen Sensor
High and Low Engine coolant Sensor
Knock sensor
Fan temp switch
Oil pressure sensor
Full distributer with cap and rotor
Plug wires
Spark plugs
Coil
2 High flow Catalytic Converters
Air filter
Battery
Thank you,
Dan
I have a 89 formula 305 5 speed that runs great when cold but sounds and feels like it is missing when engine is warm. During driving when fully warmed up, I can push the gas to the floor and the car just stutters. When the engine is cold it runs good with a lot of power. I Checked the timing and it was at 12 with the ECM jumped. I set the timing to "6" per the manual and the car runs even worse. I have checked all vacuum lines. Does anyone have any ideas on the fix for this? Here is a List of parts that I have replaced.
TPS Sensor
Oxygen Sensor
High and Low Engine coolant Sensor
Knock sensor
Fan temp switch
Oil pressure sensor
Full distributer with cap and rotor
Plug wires
Spark plugs
Coil
2 High flow Catalytic Converters
Air filter
Battery
Thank you,
Dan
Last edited by 89Formula Dan; Jan 17, 2013 at 11:43 AM.
Joined: Oct 2001
Posts: 12,232
Likes: 1,160
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: 89 Formula 305 TPI Issues
OHM your injectors when car is warm. If they are stock, those are prone to shorting out. Do a search here for the "how to".
Supreme Member
iTrader: (2)
Joined: May 2009
Posts: 3,371
Likes: 2
From: Delaware
Car: 91' Firebird SOLD
Engine: 350 TPI +bolt-ons
Transmission: 700r4
Axle/Gears: 3:42
Re: 89 Formula 305 TPI Issues
Hello guys,
I have a 89 formula 305 5 speed that runs great when cold but sounds and feels like it is missing when engine is warm. During driving when fully warmed up, I can push the gas to the floor and the car just stutters. When the engine is cold it runs good with a lot of power. I Checked the timing and it was at 12 with the ECM jumped. I set the timing to "6" per the manual and the car runs even worse. I have checked all vacuum lines. Does anyone have any ideas on the fix for this? Here is a List of parts that I have replaced.
TPS Sensor
Oxygen Sensor
High and Low Engine coolant Sensor
Knock sensor
Fan temp switch
Oil pressure sensor
Full distributer with cap and rotor
Plug wires
Spark plugs
Coil
2 High flow Catalytic Converters
Air filter
Battery
Thank you,
Dan
I have a 89 formula 305 5 speed that runs great when cold but sounds and feels like it is missing when engine is warm. During driving when fully warmed up, I can push the gas to the floor and the car just stutters. When the engine is cold it runs good with a lot of power. I Checked the timing and it was at 12 with the ECM jumped. I set the timing to "6" per the manual and the car runs even worse. I have checked all vacuum lines. Does anyone have any ideas on the fix for this? Here is a List of parts that I have replaced.
TPS Sensor
Oxygen Sensor
High and Low Engine coolant Sensor
Knock sensor
Fan temp switch
Oil pressure sensor
Full distributer with cap and rotor
Plug wires
Spark plugs
Coil
2 High flow Catalytic Converters
Air filter
Battery
Thank you,
Dan
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Joined: Nov 2008
Posts: 1,529
Likes: 50
From: Rockville Centre, NY
Re: 89 Formula 305 TPI Issues
If you get any reading that are 12ohm or less, you will need to replace the injectorswww.southbayfuelinjectors.com
516-442-4707
Senior Member
Joined: Nov 2001
Posts: 915
Likes: 2
From: Erlanger, KY
Car: 1989 Iroc-z
Engine: 350 TPI
Transmission: Auto 700R4
Axle/Gears: 9 bolt - 2.77
Re: 89 Formula 305 TPI Issues
Did you unplug the est bypass connector when you timed the engine? Will have to retime it if you didnt.
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