Engine wont start, what could it be? P0130, p1310 SOLVED

Hello,

I went to start the truck today after 2 weeks of not being used, full tank. IT would crank and seemed to want to start but would not. this would happen every time the engine was cranked.

We suspected a fuel problem, I disconnected the vacuum hose that goes to the power steering and as someone cranked the engine I kept squirting gasoline into the manifold. Engine started and I could keep it going by continuous squirting.

We removed the fuel hose at the fuel pump and it seemed to have a lot of pressure as the engine was cranked.

There was 12v at the injectors. We plugged a regular test light on the other terminal of the injector to check for pulse and it would not light up.
I also tried an analog voltmeter, nothing.

How does one check for pulse properly?

I take out the stethoscope to check for injector clicking and truck started this time with one injector disconnected. Plugged it back and engine smoothed out.

I'm puzzled at this point. I want to try to get a handle on this in case it happens again.

What should I be looking for as the possible cause?

Thanks in advance.

 

Thanks for your help. My original post is still valid, anyone else?

 

Try another battery.

 

Check into a noid light if you need a way to verify the PCM is pulsing the injectors, a regular circuit test light won't work as the circuit closure time is too short.

 

really?

 

Ya.

 

Auto Zone Noid Light Kit

This might be in their loaner tool program and should have one that fits the Toyota injector harness connector.

 

Not sure where you have that info from. I have a 97 Tacoma and it has 2 lines that connect to the power steering pump. This is used for the ECU to know when the power steering pressure ramps up. (typically when turned to lock) Why? Because when the steering pump pressure ramps up it will load the engine, risking a stall. By having a vacuum switch at the power steering pump the ECU will know the pump is ramped up, and will increase the idle speed to compensate. Normal.

 

Care to elaborate how you came to this conclusion or are you just trolling?
The fact that the engine was cranking, the fact that it eventually started means nothing?

 

Come on brah, bamatoy1997 is correct. You are not adding anything useful to this thread. I don't know if the ECU detects the pump working or not to increase the rpms, or if it is just allowing more air into the manifold that causes the Rpms to increase, but the hoses are there as initially described

On another note, I ran some errands with the truck today all worked well, I parked it for a few hours and now it's doing the same thing again. I rigged an led+resistor as a homemade noid light and plugged to one of the injector plugs, I see the led blink when I crank the engine.

So again I'm puzzled, this seems to be pointing to low fuel pressure.... how do I test this?

Thanks to all that helped so far.

 

Have to tried changing the fuel filter?

Here is another thead with the same symptoms. His was low compression. Hopefully yours isn't this problem, just throwing out some ideas.

http://www.tacomaworld.com/forum/technical-chat/223694-rough-start-when-turning-98-tacoma-2-4l.html

 

Fuel filter clogging first exhibits problems at high RPMs.

Not saying it doesn't need changing, just that it's not likely to make the starting issue better.

 

This actually depends. While trying to start the motor there is less pressure. If the filter is slightly clogged then less fuel is getting to the motor which would cause hard starts. While at higher rpms there is more pressure from the pump to push the gas through. It just depends how bad the filter is.

 

The Fuel pump is electric, Why would pressure increase with RPM? The Fuel filter was in the list of things to be changed so I might as well try swapping that first.

Thanks.

The noid light idea was a good one, don't get me wrong, I meant you were not adding anything after that by arguing the obvious. And don't self attack like that brah, don't be so hard on yourself.

 

Pressure would increase because the engine requires more fuel at higher rpm. The faster the rpms the faster the pump will run increasing fuel pressure.

 

This thread proves that you should only believe about half of what you read on the internet, and question the rest.

 

There is a fuel pressure regulator at one end of the fuel rail. The regulator's diaphragm is connected to intake vacuum, so under load when there is low vacuum the regulator closes and pressure increases in the fuel rail. At idle, the intake vacuum is high, the regulator opens and allows fuel to flow back to the fuel tank, thus lower pressure in the fuel rail.

Maybe I don't know the difference between a vacuum hose and an electric wire, but there is a vacuum line on the power steering pump as BamaToy1997 described.

I'm not sure what year or engine you have, but if you have the data connector near the intake and it has Fp and +B terminals, you can jumper these, then turn the ignition on and the fuel pump will turn on. You should be able to hear fuel moving through the fuel rail and back out through the regulator. (I'm not sure if Toyota phased this data connector out at some point, but it's on the 96 model.)

 

Sorry about the misprint. I obviously meant to type power steering pump...corrected that.

However it's done, the fuel pressure regulator adjusts the fuel pressure in the rail. The fuel pump provides a steady pressure. The point is the pressure in the rail is regulated by the throttle position and engine RPM, but it's not the output of the fuel pump that's changing.

ROFL

 

A buddy of mine had similar problems with a Ford Ranger. He'd park it for a few days and it wouldn't start and the the next day it would fire right up. It usually happened in the morning or after a rain. It turned out to be a bad Crankshaft Position Sensor.

 

Bama is correct and you are wrong. Some of the earlier Tacos have this valve later they went electric .
Read this link about one leaking.