Hard start on first crank when warm. - Solution !!

The fuel pressure regulator does what it's name implies - it regulates fuel pressure. The fuel pump puts out a constant amount of fuel at a constant pressure, even though the engine will need varying amounts of fuel depending on operating conditions. The fuel pressure regulator keeps too much guel from getting to the engine when it is not needed.

When the engine it turned off, it should maintain fuel pressure without bleeding down. On a cold start, it would supply full pressure to enable a start.

Reply to
Ray O
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I have asked on several occasions if anyone on this group could solve my problem with my Sienna 2005 van . Despite best efforts no one has been able to properly find a solution. I wanted to get back to share what I have learned. Perhaps it will help others.

The problem was that if I drove the car until it was warm, 15 minutes or so. Then let the car sit for 1 hour to 2 hours. It would not start on the first attempt at starting it. In other words, If I turned the ignition for the first time, after the wait of 1 or 2 hours it didn't matter how long it was cranking it would not start. If I stopped and then started again it would start fine. Of course a new car should start on the first turn and then after perhaps 4 or 5 seconds of cranking perhaps less.

Toyota had some difficulty sorting the problem out and it took some time. Finally however what they have told me is that it is the "Fuel Pressure Regulator" I'm not completely sure what this is but it appears anyway they felt that the fuel pressure was too low after testing and are going to replace this part. Its going to take them a few days because they don't have the part. It must be something that doesn't go often.

Anyway I pass this on for everyone else's knowledge base in the hopes that it will help others.

Regards

Reply to
Macdonald

Mac, I would be very surprised if this is true (the fuel reg)...I had exactly the same problem with a new 1983 Mazda RX-7, it would do exactly that.

While watching a stranger next to me crank his identical car for about a minute solid, I motioned for him to stop and when he rolled his window down I said to him, "try it now". He did and it started instantly, he asked me how I knew and I told him "Well, I didn't really but mine does that exact thing". I subsequently bought another RX-7 (a 1985) and it never did that at all. I really think that it's something in the ECU (engine computer) that gets it's brains scrambled).

I really doubt that you'll find a cure, just live with it, if you find yourself cranking slightly longer than normal, just pause then resume...(as the guy sings "Be happy, don't worry") :)

Reply to
Gord Beaman

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