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Discussion Starter · #1 ·
I am having a problem with my 92 mini truck. When it is hot out, the truck cranks but won't fire. It doesn't matter if the engine is hot or not. All you have to do is park it in the sun and your all done!!!! She runs great at night..... Any ideas??? <IMG SRC="smilies/confused.gif" border="0"> <IMG SRC="smilies/confused.gif" border="0"> <IMG SRC="smilies/confused.gif" border="0">
 

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I would venture to guess a vapor lock? But how hot does it get in NY right now? <IMG SRC="smilies/confused.gif" border="0"> Have you checked all the basics? <IMG SRC="smilies/confused.gif" border="0"> <IMG SRC="smilies/confused.gif" border="0">
 

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I have checked the coil, ignitor, the ditributer, battery....everything has tested OK. I even stoped by a local Toyota dealer and they don't know. It doesn't throw any codes either. I'm confused!!!! <IMG SRC="smilies/confused.gif" border="0"> <IMG SRC="smilies/confused.gif" border="0">
 

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I'm still going to say you are getting a vapor lock. I know you don't have the "sucking" fuel pump, but then again maybe your fuel lines are getting too hot. Air bubbles can also cause this. <IMG SRC="smilies/confused.gif" border="0">
 

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I'm still going to say you are getting a vapor lock. I know you don't have the "sucking" fuel pump, but then again maybe your fuel lines are getting too hot. Air bubbles can also cause this.
Uh, FI motors don't vapor lock. Fuel is under too much pressure to bubble, and the fuel pump is in the tank...Vapor lock is when the pump can't pump because it is sucking vapor.
You need to check when you crank, are you getting spark? Most likely culprits are the igniter (Most likely) and the ECU (Not unlikely). If you are getting spark, then either ECU or MAS (Mass Airflow Sensor). Good Luck <IMG SRC="smilies/rolleyes.gif" border="0">
 

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Originally posted by 4wheeldog:
<STRONG>Uh, FI motors don't vapor lock. Fuel is under too much pressure to bubble, and the fuel pump is in the tank...Vapor lock is when the pump can't pump because it is sucking vapor.
You need to check when you crank, are you getting spark? Most likely culprits are the igniter (Most likely) and the ECU (Not unlikely). If you are getting spark, then either ECU or MAS (Mass Airflow Sensor). Good Luck <IMG SRC="smilies/rolleyes.gif" border="0"></STRONG>
If I am not mistaken a leaky injector will cause pressure to drop in the lines and allow bubbles to be in the system. Maybe bad injectors?
 

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Yup, the fuel rail is a good place to start. A leaking injector or more likely, a bad fuel pressure regulator. Pull the vacuum hose off of the pressure regulator and check for fuel. If there is fuel in the hose, the regulator's diaphram is bad. Next step from here is a fuel pressure check at idle and residual pressure after engine shutdown.
 

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vapor lock?????
that's what it sounds like to me! <IMG SRC="smilies/question.gif" border="0">
 
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