wont start when its cold
12-23-2008, 12:22 PM
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wont start when its cold
i have a 1987 toyota pickup with the 22re efi engine and when it gets cold out my fuel pump will not turn on but when it warms up or if it sits in a heated shop for about 15 mins it will work and when it starts it runs great i tried changing the ignitor but that didnt seem to change anything but i dont know if i got a bad ignitor out of the junkyard or does the ignitor not even have anything to do with the fuel pump any suggestions would be great
12-23-2008, 01:47 PM
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How do you know the fuel pump won't turn on? It only turns on when you turn the key and crank the engine or when enough airflow passes through the air-flow meter.
Have you checked the cold start injector operation? It also turns on only when you crank the engine when it's colder outside (below around 60F).
Have you checked the cold start injector operation? It also turns on only when you crank the engine when it's colder outside (below around 60F).
12-23-2008, 07:10 PM
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I'll go back to my first question: how do you know the fuel pump is running? The fuel pump should turn on EVERY TIME you turn the key to start the truck. There is nothing to make the pump run when the engine is hot or cold. If you hear it run when you turn the key to start once, you should hear it EVERY time you turn the key to start.
yeah, I'm being vague because I want you to explain how you are figuring these things out.
yeah, I'm being vague because I want you to explain how you are figuring these things out.
Last edited by abecedarian; 12-23-2008 at 07:13 PM.
12-23-2008, 07:25 PM
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when its cold outside it wont start but if the tempeture outside gets around 25 degrees or warmer it will start when we bring it into a heated shop it will start after about 15 min of sitting in there then we would bring it back outside and let it sit for about a half hour it wouldnt start again
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12-23-2008, 07:33 PM
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Yeah I would check the Cold start injector on the throttle body and your temp gauge.
Going back to Abe's question. See if really your fuel pump is not working when it is below 25 degrees.
What are the symtoms of the engine not starting. Do you get the starter motor to turn the flywheel, or does it just click. Tell us everything you hear and do when you try to start the truck.
Going back to Abe's question. See if really your fuel pump is not working when it is below 25 degrees.
What are the symtoms of the engine not starting. Do you get the starter motor to turn the flywheel, or does it just click. Tell us everything you hear and do when you try to start the truck.
12-23-2008, 07:42 PM
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when it wont start we unpluged the wiring to the fuel pump back by the tank and there is no power going to the fuel pump. the engine turns over and sound fine but its not getting any fuel it soesent even attempt to fire but like i said we would leave it outside untill it would act up then we would push it in the shop and in about 10 to 15 mins it would start and run great
12-23-2008, 07:46 PM
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what we need to know is if there is voltage being sent to the fuel pump even when it's cold.
There is nothing in the system that relies on temp to send voltage to the fuel pump: the fuel pump should be turn on any time you turn the key to crank the engine (like you're trying to start it) or the engine is running.
There is nothing in the system that relies on temp to send voltage to the fuel pump: the fuel pump should be turn on any time you turn the key to crank the engine (like you're trying to start it) or the engine is running.
12-23-2008, 07:49 PM
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If it is 'honestly' being difficult to start when cold and the fuel pump is 'honestly' running, you may have water in the tank or around the fuel pump... and that water may be freezing and not letting fuel flow through the system.
If that's the case, you need to add some treatment to absorb and carry that water out of the system... and a pint or so (maybe 1/2 litre) of isopropyl alcohol would likely take care of it.
If that's the case, you need to add some treatment to absorb and carry that water out of the system... and a pint or so (maybe 1/2 litre) of isopropyl alcohol would likely take care of it.
12-23-2008, 08:00 PM
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like I said before, there is NOT a temp sensor to regulate when the fuel pump itself runs.
not sure exactly where to begin, but maybe...
this might help track down issues.
if you need help figuring it out, post on the forum. Myself, or someone will help you.
not sure exactly where to begin, but maybe...
this might help track down issues.
if you need help figuring it out, post on the forum. Myself, or someone will help you.
Last edited by abecedarian; 12-23-2008 at 08:01 PM.
12-24-2008, 05:05 AM
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I have the same problem, except when I turn the key,nothing happens. The engine doesn't crank, but I can hear a little quiet whining noise. The last time this happened, I just tightened the battery cables and away I went.
I can always tell when this is going to start happening because there starts to be a slight delay between turning the key and engine cranking. Then I just get nothing. I sit there forfive minutes and try again, and the engine cranks.
I can always tell when this is going to start happening because there starts to be a slight delay between turning the key and engine cranking. Then I just get nothing. I sit there forfive minutes and try again, and the engine cranks.
12-24-2008, 07:29 PM
#19
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Weird. Is that 25* fahrenheit or celcius when it will start outside?
Like Abe said, there's nothing electrically in the system that regulates FP voltage by temp. Is it possible that the absence of voltage at the times/temps you are seeing is purely coincidental?
Are you getting spark at the time you are not getting fuel?
At the time you are not getting fuel, do you see the CEL come on when the key is at ignition?
Like Abe said, there's nothing electrically in the system that regulates FP voltage by temp. Is it possible that the absence of voltage at the times/temps you are seeing is purely coincidental?
Are you getting spark at the time you are not getting fuel?
At the time you are not getting fuel, do you see the CEL come on when the key is at ignition?
