The pulsing up and down sounds like a tps throttle position sensor
Testimonial: "That's what I was thinking of checking the maf and the tps sensor as well"
Check throttle position sensor ( t.p.s) and wires going into t.p.s. sometimes they corrode or crack and ground with each other!
Testimonial: "I'll will check that out thank you"
There is no check engine light on
Sometimes it won't throw a code. I had one that didn't throw a code but Up on inspection the sensor was good but wires were crumbling I replaced the connector with a good one from a junkyard and never had another problem. Does not cost anything to inspect the connector and wires.
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Sounds like a fuel/air mixture issue, check for anything that could be obstructing the air intake,
Testimonial: "I will check it out and see thank u"
The truck was running perfectly normal until my uncle ran it out of gas my fuel filter was clogged shortly after the pump failed I have since replaced them both. I have a 2000 Mazda b2500 with a 2.5 liter engine,
As you can out of fuel I expect some smudged , that blocked the filter is also blocking the fuel injection system , need to flush out the fuel lines and injectors
When I changed the fuel filter black stuff came out of it
I was planning to go through the entire fuel lines I was going to check on the injectors next
Sounds like that is the problem, some of the sludge has got into the injection system
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Mite try your emc brain mite be bad ..or it mite be a sensor ...
What kind make year and model
generally speaking if you think it is fuel still if the truck is fuel injected or even carburated . try seeing how it idles with the rear of the truck up a curb and the front lower creating a natural flow from the tank. this helps to see if there is still a fuel delivery issue, also in this condition the exhaust pipe would be dry and not black around the inside edge. also usually there are 2 fuel filters one small one and one steel one closer to the engine.
if all of those are ok and fuel is flowing to injecters I would focus on the air intake equation. on the engine intake under the hood ontop while running spray water around the upper carb or injector region and listen to see if the idle n. if it does look for air or vacuum leaks and correct. next mass air flow sensor which effect idle and tells on board comp to adjust variables such as moisture and temperature as well air pressure. it has a 2 wire connector and surrounds the intake manifold before the injectors but after the air filter assembly look at it it is a tiny sensory wire that the air goes through make sure there isnt a leaf or some other obstruction causing it to misread air intake conditions. you can even try unplugging the clip normally especially on a cold engine the vehicle could or should stall. if it just continues to rough idle id get it check ed out.
lastly you could carefully while vehicle has started and running but before stalling but right when it is about to spray ether or engine starting spray down the throat of the rmoved airfilter chamber and see if the truck continues to run longer if so then u know your losing combustion from fuel loss.
lastly this time for real. since the truck keeps stalling finger or wipe around the rear exhaust pipe exit. if its black or carbony (chalky dry black u have an air or spark problem. if its dry smokey white puffy and smells sweet and funny u might have ahead gasket or coolant leaking into the chamber. if its oily sell the truck.
good luck
The truck is a 2000 Mazda b2500 with a 2.5 liter engine
The truck was running perfectly normal until my uncle ran it out of gas my fuel filter was clogged shortly after the pump failed I have since replaced them both
Also there is no engine light on
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SOURCE: 92 lesabre runs 4 minutes and dies
Make sure and check your ignitioin fuse if its out the car will start it just wont stay running verry long sometimes in most cases will turn over but not start
SOURCE: fuel pump not staying on 1993 k1500 350
Some GM products also incorporate the oil sender switch into that circuit for fuel pump, so that in case of an accident, engine shuts off, oil pressure drops, in turn, shuts off power to fuel pump. May be worth a look at what your getting for oil pressure, as well as checking switch/sender.
SOURCE: our truck died while driving down the road we
that may be caused by a plugged fuel filter or fuel line, you need too replace the filter when you replace the pump.............
SOURCE: I have a 1990 isuzunpr 4bd1t diesel.Truck won't
G'day
I dont know if this will help but i had a similar problem with an isuzu sbr and after doing all that you have done i took the fuel tank off and drained it. Every thing looked fine so i washed it out with a little bit of petrol and a small piece of clear plastic came out. What it was doing was floating up when the truck was not running but after i started the truck it would slowly get sucked down to the outlet and block the fuel line.
It was very frustrating and it took me quite a while to find the problem.
hope this helps.
SOURCE: Truck just dies when going down the highway like
i have a 2000 nissan frontier that dies going down road,it has knock sensor,camshaft sensor&primary ignition circuit failure.had a new distributor.thanks for any help
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