Question about 2001 Isuzu Rodeo

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Engine is lacking fuel and can't accelerate when engine cold

When the engine is cold the car can't accelerate in park or in drive. On data stream, pcm opens injector too short as coolant temperature show cold engine. After roughly one min, i can accelerate or drive anywhere i like. Any help will be appreciated. PLEASE HELP ME !

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  • 167 Answers

Check the CHT sensor .Could be telling the ecu that the engine is warm and not cold.
Let me know how it goes.

Posted on Jun 28, 2009

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Posted on Jan 02, 2017

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I have a 2003 Ford Expedition. It is showing overheating and then will shoot right back down. We've replace the thermostat but that doesn't seem to be the problem. doesnt appear to be overheating.


Bad gauge , maybe !

Temperature Gauge
The PCM receives the engine coolant temperature status through hardwired circuitry to the engine coolant temperature (ECT) sensor. The instrument cluster receives the engine coolant temperature data from the PCM through the SCP communication network. The instrument cluster microprocessor monitors the engine coolant temperature data received from the PCM and commands the temperature gauge indication with a corresponding movement of the pointer.

At the dealer we would hook up factory scan tool an see what the PCM is seeing for coolant temp . then go into data stream of instrument cluster an see if it is receiving the same data . , Your best bet , take it to a ford dealer . Before you start replacing parts that don't fix the problem .

Mar 26, 2017 | Ford Cars & Trucks

1 Answer

Temp guage not working 1999 alero


One advantage us dealer tech's have over a week end warrior is that we have factory service repair information and have factory scan tool ,Tech 2 , to check data coming into the instrument cluster . Most of you probably don't even think about how that coolant temp infor shows up on the gauge , except by a coolant sensor !

High Temperature Indicator
The high temperature Indicator function handles the control of the Engine Temperature Gauge Display and the red High Temperature indicator. The Powertrain Control Module (PCM) reads the Coolant Temperature Sensor, filters the messages, and sends the coolant temperature to the instrument cluster via a Class 2 serial data message. The PCM monitors the coolant sensor in order to determine a fault. The PCM transmits the Class 2 serial data coolant temperature report messages to the instrument cluster for the temperature gauge display and for the high temperature indicator control.
The instrument cluster receives the engine temperature data in the Class 2 serial data message from the PCM. The instrument cluster converts this data into a temperature gauge pointer position which drives the gauge pointer. The instrument cluster also uses this data in order to determine the high temperature indicator control.
The Body Control Module (BCM) looks for the high temperature indicator Class 2 serial data report from the instrument cluster and triggers a chime when the indicator is ON.

Your best bet , take it to a qualified repair shop , rather then just replacing parts .

Feb 10, 2017 | 1999 Oldsmobile Alero

2 Answers

If a engine coolant temp. Sensor is bad would this cause a misfire in cylinder two on my 2.3 Lt. Suzuki aerio.


Not likely. A bad coil pack or fouled spark plug will. If the injector is not metering enough fuel, the cylinder will experience a lean misfire.

Oct 22, 2016 | Suzuki Aerio Cars & Trucks

1 Answer

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

Looking for wire for heater gage temperature


Depending on the year there isn't any . All done by computer on serial data bus communication network. The coolant temp. is supplied to the engine computer By a ETC - engine coolant temp sensor . All the modules on the vehicle ( ABS , air bags , BCM , instrument cluster , RKE module etc... ) Share info on this data bus network . If the gauge isn't working probably bad ,If a communication network problem the gauge will default to fixed temp degree . This is for a 1999 Buick , out of factory service repair manual . But all vehicles are pretty much the same .
Engine Coolant Temperature Gauge
The Powertrain Control Module (PCM) via the class II serial data line to the instrument cluster, broadcasts the coolant temperature. The instrument cluster compares the temperature data using a 16 point look-up table in order to determine the needle deflection. A smooth filter is used in order to secure a continuous response. The instrument cluster drives the temperature gauge to C (cold) under the following conditions:
• The temperature data is lost.
• The PCM is in a state of health fault.

Mar 09, 2016 | Cars & Trucks

4 Answers

My vehicle shuts off while driving


Are you loosing fuel pressure, or spark ?

Feb 12, 2015 | 2000 Jeep Grand Cherokee

1 Answer

Reduced engine power


Have the vehicle checked for DTC'S - diagnostic trouble codes ! Do you know what electronic throttle control is ? The gas pedal assembly has electrical connector an sensors inside ,hooked to the PCM / ECM - engine computer . The engine computer uses these position sensors inputs to control the DC motor on the throttle body to open the throttle plate to control the speed . Plus there are position sensors inside the throttle body to input PCM/ECM to see if it's calculations are corect . Your best bet maybe to take it to a qualified repair shop .
Drive by Wire Function and diagnostics by Wells

Reduced Engine Power Mode
When the PCM detects a condition with the TAC system, the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The control module will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
• Limited throttle mode--The control module will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
• Throttle default mode--The control module will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The control module will perform the following actions:
- Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned off.
- Ignore accelerator pedal input.
• Engine shutdown mode--The control module will disable fuel and de-energize the throttle actuator.

May 12, 2017 | 2004 GMC Sierra Denali

1 Answer

Hi.my bmw e46 318i year 2003 lack of power.as if It hesitate. It gives late response.


hot engine, or cold, or both
does it reach full 180F coolant temp or more and HOLD?

id have to drive it, on here ,, im blind. and can't drive.
but here is a wild guess. based on almost no inputs.
bad TPS.
low fuel pressure

is the check engine light on, key, then goes out driving? does it?
CEL lamp. is first.
then 2nd is a FULL OBD2 scan of the PCM. look for problems.
i look at live data. and know what to expect, but most folks don't.
we watch all sensors, and look for factory only DTC errors.
the sensor are easy to monitor.
as is LTFT and 02 ops.

Jun 09, 2014 | Cars & Trucks

1 Answer

Car accelerates itself


what year car, all are different, no year, no real help.

please do elaborate that
im doing what?
is this a problem parked, (in parking , implies you are stopping while driving?) what?
does this failure, happen, in PARK? (shift lever in park)
or is parking a verb, in that, im going to park but are attempting it.

questions.
is engine hot or cold, does it fail in hot or cold only or both.
the dash gauge shows, the engine temperature, a key fact.

are the floor mats hitting the gas pedal. like on most toyota's it seems?
are your feet, hitting the wrong pedals,
driving with snow ski boots?
if the fuel pedal is not sticking, then its a real problem.
for sure dont drive car... like this. if it is a real engine problem.

and yes, all cars can fail and do that.
just sticking throttle , and bingo.


Dec 27, 2013 | Jeep Cherokee Cars & Trucks

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