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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Posted on Jan 02, 2017

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2000 F150 4.6l V8 4WD truck starts runs 2-5 sec then dies over and or over


Hello, hope you get more than 1 answer to this. It could be true about codes but not familiar with that. What I have been taught is that your truck will try to start without all of the components reporting status. When the initial start is performed the components report in and adjust fuel ratio, rpm and fuel pressure. If these signals do not satisfy what it is suppose to be, then it defaults to a stall.

When you have an initial cold start, there is a "cold start sequence" which changes rpm, fuel mix, and fuel pressure. This is controlled by a temperature sensor which tells the main brain that the engine is cold and needs cold settings. If the temperature sensor is stuck on hot, is broken, unplugged or wires chewed by mice, you lose the cold settings and the "cold start sequence". You might be low on antifreeze so that the sensor can not read the motor temperature.

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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.
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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
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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.

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I have a ford escort rs turbo s2 1988 mk 4 it starts then it stops it starts because of the cold start valve im sure there is somthink wrong with the fuel metering unit as it is not pumping any fuel in to...


The crankshaft position sensor gives a report on engine rpm and this is how the fuel pressure is set for a given rpm. The cold start sequence could temporarily enrichen the fuel and adjust rpm then hand off duties to position sensors. Also cam timing sensor needs to work to maintain fuel flow.

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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,

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