Question about 1994 Pontiac Firebird
I'm having a intermittently rough running issue. If anybody can help, Does anybody know which of my emissions systems, ignition parts/sensors, and/or solenoids ONLY start functioning after my 1994 Firebird (3.4ltr./manual) is fully warmed up and driven for about 10 minutes to a 1/2hour or more of driving? The on-set of the symptoms most often seem to start happening when I drive it on the freeway 3 miles or more miles...then park and let it sit for 15-20 minutes or more. Then...it starts happening when I re-start it (and it's already been warmed up and driven (WOT) like that). It also seems to be triggered sometimes by a little extra load...like a freeway hill or something). It feels like my timing advance (for higher speeds/hotter engine/higher load. or as in on a hill) on the ignition coil module just clicks to open circuit (or close circuit),..? or maybe a solenoid opens (like my EGR)...? Whatever it is, I lose lots of power and MPG. It also makes my car sputter and pop. I've recently checked my O2 sensors with a digital volt meter, and they seem a little lazy. They seem to go lean (about 50 mV) when I push on the gas. Then they seem to take 7-12 seconds to go back over to rich condition. When I push on the gas it surges and lags and lacks power. Could that be what's causing a symptom like mine (only runs weird when it's hot. and it happens all the sudden). I've recently replaced my Spark Plugs, SP wires, coils, ignition coil module, air and gas filters, PCV, and took my EGR off and cleaned/ put in new gaskets, cleaned out my throttle body. I've also cleaned my PCM connectors and sockets along with all the other engine compartment wiring harnesses, connectors, and grounds. Thanks in advance.
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Posted on Jan 02, 2017
SOURCE: 1991 Pontiac Firebird V6 3.1
That code is for an IAC. Without a scan tool or something to manually drive it, you won't be able to confirm the problem is the IAC itself. Your best hope is to just take a shot and change it. See what you have after that.
Let me know,once done.
Hope i helped you.
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Posted on Apr 28, 2011
Tips for a great answer:
The barometric pressure (BARO)
The manifold absolute pressure (MAP)
The intake air temperature (IAT)
The engine RPM
P0121 The predicted air flow and the predicted MAP combined are outside a calibrated range for more than 3 seconds.
Inspect thoroughly for any type of leak or restriction
Air leaks at throttle body mounting area and intake manifold sealing surfaces
Throttle body for dirt, debris, and coking--Refer to Throttle Body Cleaning.
Increase the engine speed slowly to 3,000 RPM, then back to idle.
Exit from the snapshot and review the data.
Observe the Mass Air Flow (MAF) Sensor parameter frame by frame with a scan tool. The MAF sensor g/s should change smoothly and gradually as the engine speed is increased and is returned to idle.
If the MAF sensor g/s does not change smoothly and gradually as the engine speed is increased and is returned to idle, refer to DTC P0101 or P1101.
Broken throttle shaft
Any throttle body damage
If any of these conditions exist, replace the throttle body assembly.
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