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After reading the trouble code I changed the throttle positioning sensor and now it gets too much fuel floods and will not start.

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You have to zero out the postion sensor with an ohm meter. disconnect the plug for the TPS then with an ohm meter turn it to where ohm meter reads 0 ohms with throttle closed, next tighten screws then with ohm meter still connected open the throttle plate it should read 0 ohms till the plate opens and then should increase as it is put in wide open throttle postion, if it goes stratigh over to full postion then the swich is defective remove and take back to autoparts store. then restet the new switch, it is common to get a bad TPS every once and a while.

Posted on Jul 05, 2010

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Test your idle air control valve and your idle mixture

Posted on Jul 05, 2010

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Had a p305 on my 2005 buick rendezvous engine light is on changed the coil pack. it still hard to start unless i mashed the gas. it stalls at the light


Starting Mode
With the ignition switch in the ON position, before engaging the starter, the PCM energizes the fuel pump relay for 2 seconds allowing the fuel pump to build up pressure. The PCM first tests speed density, then switches to the mass air flow (MAF) sensor. The PCM also uses the engine coolant temperature (ECT), the throttle position (TP), and the manifold absolute pressure (MAP) sensors to determine the proper air/fuel ratio for starting. The PCM controls the amount of fuel delivered in the starting mode by changing the pulse width of the injectors. This is done by pulsing the injectors for very short times.
Clear Flood Mode
If the engine floods, clear the engine by pressing the accelerator pedal down to the floor and then crank the engine. When the throttle position (TP) sensor is at wide open throttle (WOT), the PCM reduces the injector pulse width in order to increase the air to fuel ratio. The PCM holds this injector rate as long as the throttle stays wide open and the engine speed is below a predetermined RPM. If the throttle is not held wide open, the PCM returns to the starting mode .
You could have a dirty or bad mass air flow sensor .
You could have

Mar 25, 2016 | Buick Rendezvous Cars & Trucks

1 Answer

I have a 1997 Chevy cavalier z24 it's hard to start it and when it does start I smell raw gas I just replace spark plugs and map sensor and throttle body sensor wen put it in gear a the car die


I saw what you replaced, but, didn't see any testing? Use a gage and check proper fuel pressure. Also, see if pressure will hold for a bit, everything off. If the pressure drops like a rock, you have a fuel pressure leak. Check fuel pressure regulator vacuum line, if it has gas in it, the regulator is faulty. Could have leaking fuel injector or the fuel is leaking back through the fuel pump.
Any applicable trouble codes? To check codes yourself, at the least, you need an obd2 code reader.
Your coolant temp sensor might cause it to flood, if it is flooding? How long since a tune-up? Don't replace anything unless your testing points in that direction.
Smell of the crankcase oil dipstick, if it smells like gas, I wouldn't drive it till you fix the problem. Change oil and filter as many times as needed to get rid of the gas.

Feb 02, 2016 | Cars & Trucks

1 Answer

Will bad throttle position sensor keep jeep GC inline 6 from starting?


it can. especially if it thinks its wide open throttle. try spraying b-12 carb cleaner in the throttle and see if it will run for a sec? if so its a fuel issue. id change sensor anyway for the code and see if it runs

Sep 13, 2014 | Cars & Trucks

2 Answers

90 Civic DX. Cranks but doesn't run. When towed in gear it will run, but 'bogs out' as soon as throttle applied. Engine floods upon trying to startup. Plenty of spark, fuel and air. Though


First I am not aware of two flaps or throttle plates in the body, but I do see a rubber diaphram with a rod that could open a plate with vac.
If you have something blocking air entering the throttle body it could cause the engine to flood. A faulty temp sensor could also be telling the computer to dump extra fuel into the cylinders, but you should have a trouble code for that.
If the plugs are getting spark the ignition system is working.
What would happen if you disabled the fuel pump and started it without extra fuel ? You could have a leaking fuel pressure regulator or something allowing extra fuel into the cylinders.

Jan 13, 2013 | 1990 Honda Civic

1 Answer

2kd-ftv engine problem p1226 fuel line malfunction


Possible causes of the P1226 code include:
  • Faulty electric throttle control actuator, throttle position sensor 2
  • Faulty throttle control actuator harness is open or shorted, throttle position sensor 2
  • Electric throttle control actuator circuit has poor electrical connection, throttle position sensor 2
To nail down the exact cause of the code, do a visual inspection for lose wires and connections at the sensor, or damage to the sensor body itself. If no problems with the wiring and connections are detected, a worn/damaged electric throttle control actuator is likely at fault. Signs of a bad throttle control actuator include erratic acceleration, and unresponsive throttle, and poor fuel economy.

Sep 23, 2012 | Cars & Trucks

1 Answer

What causes the 2002 nissan se r to backfire


Sounds like an ignition or timing problem.
Is the check engine light on ?
This engine uses a direct ignition system which means each cylinder has a coil on top of the spark plug. It could be as simple as worn out spark plugs.
If you had said the engine backfired and was hard to start, but no flooding, I would also look at low fuel pressure. But too much fuel causes flooding.
A faulty throttle position sensor could cause all of your symptoms, but it should set a trouble code and turn on the check engine light.

Jul 06, 2012 | 2002 Nissan Sentra

2 Answers

1990 trooper 2.8L V6 Gasoline starts hard if at all,fires then backfires then runs a few sec then dies


Have you cleaned the throttle valve and the air bypass idle speed control valve? If not do that. When they get really gummed up from backwash from the combustion process they cause this problem of stall on cold start.

Mar 16, 2017 | 1990 Isuzu Trooper

1 Answer

Truck turns over trys to start then wont


The amount of fuel delivered to a properly functioning injected car is determined by sensors mounted throughout the vehicles air intake system. These sensors work together along with the ecu to control the fuel / air mix delivered to the cylinders.
We would need to isolate the components that have impact on the duration of time the injectors stay open. In troubleshooting it is often best to work backwards.
1. Injectors - Are they leaking
2. Pressure regulator - is the pressure at the fuel rail the right pressure?? (40psi for most fuel injected cars)
3. TPS- throttle position sensor- is this reading accurately...there are several different styles of these
4. Air flow meter - these also come in several varieties varys from mass air sensor / simple vane meters.
5. during startup there is a seperate circuit called the throttle bypass valve - this also may not be functioning if the flooding is occuring rapidly during startup. If the car starts and runs for a while than floods. this is probably not the culprit.
6. ultimately the ECU could have a problem as it is the link in the chain that ties everything together....though not likely.
Any of these these would have the potential to flood a vehicle if they were not functioning properly.
The amount of fuel delivered to a properly functioning injected car is determined by sensors mounted throughout the vehicles air intake system. These sensors work together along with the ecu to control the fuel / air mix delivered to the cylinders.
We would need to isolate the components that have impact on the duration of time the injectors stay open. In troubleshooting it is often best to work backwards.
1. Injectors - Are they leaking
2. Pressure regulator - is the pressure at the fuel rail the right pressure?? (40psi for most fuel injected cars)
3. TPS- throttle position sensor- is this reading accurately...there are several different styles of these
4. Air flow meter - these also come in several varieties varys from mass air sensor / simple vane meters.
5. during startup there is a seperate circuit called the throttle bypass valve - this also may not be functioning if the flooding is occuring rapidly during startup. If the car starts and runs for a while than floods. this is probably not the culprit.
6. ultimately the ECU could have a problem as it is the link in the chain that ties everything together....though not likely.
Any of these these would have the potential to flood a vehicle if they were not functioning properly. I would run a diagnostic check on your vechile to isolate your exact problem

Aug 14, 2009 | 1997 Toyota T100

1 Answer

I have problem with code 1126 (toyota 4 runner 2001


Manufacturer Specific Codes

P1100
BARO Sensor Circuit - Read Our Article on Automotive Circuit Testing For Help With This Toyota Check Engine Light Code

P1120 Accelerator Pedal Position Sensor Circuit - Read Our Article on Automotive Circuit Testing For Help With This Toyota Check Engine Light Code

P1121 Accelerator Pedal Position Sensor Range/Performance Problem

P1125 Throttle Control Motor Circuit - Read Our Article on Automotive Circuit Testing For Help With This Toyota Check Engine Light Code

P1126 Magnetic Clutch Circuit

P1127 ETCS Actuator Power Source Circuit

P1128 Throttle Control Motor Lock

P1129 Electric Throttle Control System

P1130 Air/Fuel Sensor Circuit Range/Performance (Bank 1 Sensor 1) - Read Our Article On Oxygen Sensor Codes For Help With This Toyota Check Engine Light Code - More Related Information

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P1300 Igniter Circuit Malfunction - No. 1

P1305 Igniter Circuit Malfunction - No. 2

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P1349 VVT System

P1400 Sub-Throttle Position Sensor

P1401 Sub-Throttle Position Sensor Range/Performance Problem

P1405 Turbo Pressure Sensor Circuit

P1406 Turbo Pressure Sensor Range/Performance Problem

P1410 EGR Valve Position Sensor Circuit Malfunction - Read Our Article on EGR Valve Codes For Help With This Toyota Check Engine Light Code

P1411 EGR Valve Position Sensor Circuit Range/Performance - Read Our Article on EGR Valve Codes For Help With This Toyota Check Engine Light Code

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P1511 Boost Pressure Low

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P1630 Traction Control System

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P1705 Direct Clutch Speed Circuit Fault

P1765 Linear Shift Solenoid Circuit Fault

P1780 Park/Neutral Position Switch Malfunction (Only For A/T)

Back To Top Of Toyota Check Engine Light Codes Page

Mar 21, 2009 | 2002 Toyota 4Runner

1 Answer

Vehicle runs rough and seems to be flooded


Assuming it has a 3.1 V-6, it could be any # of failures. Bad plug wires, ignition coils, control module (under coil packs), crankshaft position sensor, map sensor, throttle position sensor, egr valve, fuel pressure regulator, fuel injectors, engine coolant temperature sensor, vacuum leaks; have it scanned for trouble codes to help in diagnosing! If you think it is just over fueling (flooding),look at fuel pressure regulator or coolant temp sensor ( when they fail the computer thinks its always -40 F causing it to over fuel). A bad map sensor can cause the same. Hope this helps. Thanks in advance for rating me!

Jan 22, 2009 | 1993 Oldsmobile Cutlass Supreme

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