Question about 1995 Toyota 4Runner

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I have a hard starting problem when cold.plus the rpm sensor code is on ? not sure if fuel pressure is fully up? and changed warm up valve .it gets power but no spray.v6 180k

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Hi, on the hard starting problem when cold, my best guess is to have the idle air control valve cleaned. Almost any Toyota dealer can do this for you.
Secondly the rmp sensor code on means you have a faulty crank sensor...

Posted on Oct 07, 2010

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Code p1400 gmc enjoy 2007 what is the problem in this code


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Loses power in high gears


run fault codes and look for accelerator position sensor fault . Check for MAP/MAF sensors as well

Feb 18, 2014 | Cars & Trucks

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P0449 code 1995 dodge dakota


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(1)EVAP Purge Solenoid Ignition Positive Voltage
(2)To Intake Manifold Port
(3)Fuel Tank Pressure Sensor
(4)Fuel Tank Pressure Sensor Ground Circuit
(5)Fuel Tank Pressure Sensor Signal Circuit
(6)Fuel Tank Pressure Sensor 5V Reference Circuit
(7)Fuel Filler Neck
(8)Rollover Valve
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(11)EVAP Vent Valve Control Circuit
(12)EVAP Vent Valve Ignition Positive Voltage
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(15)EVAP Purge Solenoid Control Circuit

check this out on your vehicle. also make sure there is no air lines leaking on the engine.

Jan 25, 2014 | 1995 Dodge Dakota

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1996 honda will not start under 60 degrees


tune it up. (fresh spark parts work best in cold and for sure damp wheather.
fresh gas?
leaking injectors?
isc stuck closed, and rpm low, hot?

the ecu, anticipates the next cold start,
it knows how much to open the iSC valve, to get a good start cold
and if colder to day, it opens more. (math)
if it (ISC) is gummed up,fas all do, it cant start right
so next time, try %10 throttle, starting, emulating a good ISC.
see?

Jan 07, 2014 | 1996 Honda Accord

2 Answers

Hard starting


It can be caused by a bad crankshaft sensor, plugged fuel filter, or clogged tank internal filter, as well as a failing fuel pump. Although the crankshaft sensor may not seem to be related to the fuel group, fuel demand is anticipated by counting the RPM's which is the crankshaft sensors job.
Now "hard to start" issues can be fuel pump pressure problems. But do not forget the "cold start routine" which requires a temperature sensor to set the engine management system for a cold start. It becomes less of a factor when the engine is warm but would not be responsible for low fuel pressure.
A simple test for vacuum leaks is to have the engine running and use a spray bottle of water on vacuum lines, intake gasket seams, EGR pod and the brake booster. A leak will reduce RPM or stall the engine.
For the internal tank filter, sometimes the plastic screen on the fuel pump deteriorates and clogs the pump intake. To test that, blow air into the fuel test port. This will help clear debris inside the tank temporarily, then check fuel pressure without driving the car and stirring the tank up. If pressure improves you know the root cause of your problems.

Jun 27, 2013 | 1997 Lincoln Mark VIII

1 Answer

Engine cuts out only when fully warmed up. Also, starts idling very rough when fully warmed up. Also after fully warmed up it will not restart until it cools down. Definitely temperature sensitive.


two things to check. First, check the EGR valve to see if it is sticking open. this valve is not activated until the engine is warm. This valve could also have a vacuum leak in its diaphragm so check the valve out thoroughly.

Second, there is an engine coolant temp (ECT) sensor that alerts the engine computer as to when the engine is warmed up. If this sensor is faulty and stuck in the full cold mode, it will tell the computer that the engine is cold even when it is fully warmed. The computer will then use the cold engine fuel schedule which is way too much fuel for a warm engine. The engine will run too rich and sputter. In this condition, the computer will schedule too much fuel for a warm start and the engine will flood. That is why you must wait for it too cool down and "match" the faulty sensor.

Note: the ECT has two wires going to it and is dedicated to informing the engine computer. It has nothing to do with the engine temp gauge on the dash board instrument panel. The sender for the dash gauge has only one wire. The two sensors are easily confused.

Feb 20, 2011 | 1994 Toyota Corolla

1 Answer

Oldsmobile Delta 88, Idles High on Cold start with DTCs


Sounds like a vacumn leak. Gasket under intake plenum may be leaking. Be sure the pcv valve has the o-ring around it in the correct place also as it will set a code.

Jan 18, 2010 | 1997 Oldsmobile 88

1 Answer

Ideling 1600 rpm onlywhen engine warm


please change the idling switch control valve assembly plus the sensor!

Jun 18, 2009 | Mercedes-Benz SL-Class Cars & Trucks

1 Answer

94 olds hard starts when warm, starts when cold and runs rich


If you can get a fuel pressure gauge, check and see if the pressure is 16 to 24 lbs after the engine has warmed up.
I would connect the pressure gauge when the engine is cold, make sure it does not leak or touch anything hot, place the gauge between the hood and the windshield and drive the vehicle until it is at the temperature you feel it "starts hard". Shut the engine off and try to repeat the no start or hard start and make sure the pressure is correct.
Also, when you shut the engine off, watch the pressure and make sure it holds and does not drop to (0 LBS) of pressure.
One last question, has the fuel filter been changed in the past 30K.
Let me know.
Regards,

May 08, 2009 | 1994 Oldsmobile Bravada

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