Code 34 Problems
Thread Starter
Junior Member
Joined: Aug 2003
Posts: 45
Likes: 0
From: Virginia Beach Virginia
Car: 1991 Firebird 1988 Trans Am GTA
Engine: 91-v6 88-305
Transmission: Auto's
Axle/Gears: No Clue
Code 34 Problems
This is what I have and what Ive done
1988 TA GTA 5.0 Auto .. Intermittent Code 34
Replaced,
MAF Sensor
Maf Relay
Burn Off Relay
Ingition Coil ( other reason ,, old one died )
New Cap and roter ( havent yet gotten under to change the Plugs and Wires )
Now the Code 34 is intermittent, and only happens every 4-10 Days but when It does the car runs terrible .. however after I let it sit for say 30 min it is back to normal.. No other codes Showing or stored
O btw it has the stock Air Tube and Stock Air box, Ive cut 2 Addition Opening in the side of the Air box
Help?
1988 TA GTA 5.0 Auto .. Intermittent Code 34
Replaced,
MAF Sensor
Maf Relay
Burn Off Relay
Ingition Coil ( other reason ,, old one died )
New Cap and roter ( havent yet gotten under to change the Plugs and Wires )
Now the Code 34 is intermittent, and only happens every 4-10 Days but when It does the car runs terrible .. however after I let it sit for say 30 min it is back to normal.. No other codes Showing or stored
O btw it has the stock Air Tube and Stock Air box, Ive cut 2 Addition Opening in the side of the Air box
Help?
Thread Starter
Junior Member
Joined: Aug 2003
Posts: 45
Likes: 0
From: Virginia Beach Virginia
Car: 1991 Firebird 1988 Trans Am GTA
Engine: 91-v6 88-305
Transmission: Auto's
Axle/Gears: No Clue
Also, The Air System is all still there as far as I know , just the Lil silver tube is capped off just before the Cat
Throttle Position Sensor (TPS)
Tools needed:
1. Digital Volt-Ohm-Meter (VOM)
2. Breakout jumper wires or probes (make your own)
3. OPTION: AutoXray, Diacom, or similar scanner (will replace the VOM and jumper wires).
Turn on ignition, but don't start the engine.
With a diagnostic scanner: plug in the scanner and read the TPS voltage. It should be 0.54Volts +/- 0.07 VDC.
Connect the VOM to the TPS electrical connector terminals ‘A' and ‘B'.
With a breakout jumper: Disconnect the electrical connector from the TPS. Install the breakout in-line, between the TPS and wiring harness connector. Connect the meter probes to terminals 'A' and 'B' on the connector. (‘B' is the positive connection, ‘A' the signal ground, or negative.)
With probes: If you have very slender probes on your VOM, you can back-probe the TPS connector while it is attached to the TPS. If you have made probes of large dressmakers pins or a similar item, you can back-probe the connector as well. Connect the meter probes to terminals 'A' and 'B' on the connector.
Turn on the ignition to read the TPS output voltage at the idle position. The reading should be 0.54VDC +/- 0.07VDC. The ideal is the center of the range, 0.54VDC for a stock engine. To adjust the output voltage, loosen the two Torx screws holding the TPS to the throttle body, and slightly rotate the TPS up or down, reading the voltage until it comes into specification. Tighten screws. Using the throttle lever, rotate the throttle to WOT (wide open throttle). The TPS voltage should be over 4.0 volts. Close the throttle again, and then slowly open it to WOT, observing the voltage reading. It should increase progressively and in a linear fashion. If it sticks or jumps or falls off at all while doing this check, the TPS sensor may be failing and could be a cause of stumbling and driveability problems.
After achieving the desired setting, turn off the ignition switch. Remove all jumpers or the scanner and reconnect the TPS connector as required.
Tools needed:
1. Digital Volt-Ohm-Meter (VOM)
2. Breakout jumper wires or probes (make your own)
3. OPTION: AutoXray, Diacom, or similar scanner (will replace the VOM and jumper wires).
Turn on ignition, but don't start the engine.
With a diagnostic scanner: plug in the scanner and read the TPS voltage. It should be 0.54Volts +/- 0.07 VDC.
Connect the VOM to the TPS electrical connector terminals ‘A' and ‘B'.
With a breakout jumper: Disconnect the electrical connector from the TPS. Install the breakout in-line, between the TPS and wiring harness connector. Connect the meter probes to terminals 'A' and 'B' on the connector. (‘B' is the positive connection, ‘A' the signal ground, or negative.)
With probes: If you have very slender probes on your VOM, you can back-probe the TPS connector while it is attached to the TPS. If you have made probes of large dressmakers pins or a similar item, you can back-probe the connector as well. Connect the meter probes to terminals 'A' and 'B' on the connector.
Turn on the ignition to read the TPS output voltage at the idle position. The reading should be 0.54VDC +/- 0.07VDC. The ideal is the center of the range, 0.54VDC for a stock engine. To adjust the output voltage, loosen the two Torx screws holding the TPS to the throttle body, and slightly rotate the TPS up or down, reading the voltage until it comes into specification. Tighten screws. Using the throttle lever, rotate the throttle to WOT (wide open throttle). The TPS voltage should be over 4.0 volts. Close the throttle again, and then slowly open it to WOT, observing the voltage reading. It should increase progressively and in a linear fashion. If it sticks or jumps or falls off at all while doing this check, the TPS sensor may be failing and could be a cause of stumbling and driveability problems.
After achieving the desired setting, turn off the ignition switch. Remove all jumpers or the scanner and reconnect the TPS connector as required.
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