SOURCE: location of the IAT (Intake Air Temp)
it is in the air intake tube between the air filter and the throttle plate
SOURCE: 2000 4.0 sohc explorer cold start erratic, almost
timing chains rattle at start up HEELP!!!! <<<<< This Will NOT Set A Code And WILL Cause EP Engine Performance Problems, If the Timing Chain DEVIATES More than 8 Degrees it is NO GOOD for OPTIMUM Engine performance.
The Fact that you have NO CODES Lieves DIAGNOSING it Fairly Simple. Morning Starts (COLD START) is a CLOSED LOOP Condition and by the time it warms up it closes LOOP and the ECM takes over the Timing, and compisates for the LOOSNESS of the Timing Chain by ADVANCING / RETARDING the Timing. thus Good Running when Warmed up. Hope & I Wish you Good Luck with it.
Feel Free to Fallow up with Me by Email. my Screen name here
at aol.com is my Email address
Testimonial: "that where i was heading, thank you it is appriciated"
SOURCE: NOT SHOWING TEMP ON GAUGE,ENGINE LIGHT IS ON,FANS
You may want to check out http://www.obd-codes.com/p0128 it has some good info on your problem.
SOURCE: Where is the IAT sensor on a 03 Ford Taurus,3.0L. flex fuel?
You don't change parts when you get a code. The codes are a starting point for diagnostic testing.
Codes are the symptoms of a possible problem,such as an out of range or defective sensor. Codes don't mean you change something. It's not that simple or are vehicles designed as such. You always test,then replace. You can't do either, if you don't know the system your working on.
The MAF and IAT Sensors are both in the MAF,one piece in most cases.
What are your issues ? Not likely a MAF gone bad.
Do you have the air filter cover on tight and no duct work leaks or vacuum leaks? That's what's possibly setting the code for the MAF.
SOURCE: 1999 Malibu hard start in hot weather, after it
this is most likely a fuel vapor issue.
fuel
boils in the fuel rail causing a hard start after a 'hot soak'.
the fix
is to replace the fuel pressure regulator and the pcm. good- day !!
OR
?€¢
The control module detects a temperature difference between the ECT sensor and the IAT sensor of more than 15°C (27°F) and the time elapsed cranking the engine without starting is more than 5 seconds.
OR
?€¢
The control module detects a temperature difference between the ECT sensor and the IAT sensor of more than 15°C (27°F). The vehicle must then be driven for 5 minutes over 40 km/h (25 mph). If the IAT sensor temperature decreases more than 5°C (9°F), an engine block heater was detected and the test is aborted. If the IAT sensor temperature does not decrease, an engine block heater was not detected and DTC P0116 will set.
Diagnostic Aids
?€¢
Inspect the ECT sensor terminals for corrosion and for engine coolant leaking through the sensor. Engine coolant that is leaking through the sensor will create a high resistance short to ground. This condition results in less voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a warmer ECT.
?€¢
An IAT sensor that is skewed colder at various ambient temperatures due to greater resistance than is normal will increase the range between these two sensors. Measure and record the resistance of the IAT sensor at various ambient temperatures, then compare those measurements to the Temperature vs Resistance table. Refer to Temperature Versus Resistance .
?€¢
A slight to moderate resistance in the IAT sensor signal circuit or low reference circuit will increase the range between these two sensors. This condition results in a greater voltage on the IAT sensor signal circuit, which is interpreted by the ECM as a colder IAT.
Circuit/System Verification
This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125
In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.
A code P0128 may mean that one or more of the following has happened:
Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
REFERENCE: http://www.obd-codes.com/p0128
I hope this helps a bit!
435 views
Usually answered in minutes!
Hi William Barker, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?
1995 lincoln t/c, everything is new sensors, electrical components, EVERYTHING . Cranks but won't fire.
I just bore scoped the crank sensor, everything turns and looks great I get .4 volts when I tested the sensor with multi meter.
I also get .4 volts at the ICM, I have the Autel scanner hooked up and it shows no rpm's when cranking. It has the 2nd new EEC (comp)
Don't understand if the ckp is supplying volts that means rotation but scanner is showing zero rpm's.
So why would the second EEC be showing no rpm's when cranking? Bore scoped the cpk everything looks correct and working fine.
×