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2003 Saturn Vue: runs great..restart..the throttle body..switches…

Customer Question
I have a 2003 Saturn...
I have a 2003 Saturn Vue that starts like a charm when the engine is cold and runs great until I turn it off and try to restart it within 30 minutes. After it cools down - about 3 hours, it will start immediately and runs great. We have changed the throttle body and fuel relay switches. Computer diagnostic tests are not showing any codes to tell us the problem and our mechanic is stumped. What do you suggest?
Submitted: 8 years ago.Category: Saturn
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Answered in 2 minutes by:
6/10/2010
Saturn Mechanic: 15yearsaturnguy, Saturn master tech replied 8 years ago
15yearsaturnguy
15yearsaturnguy, Saturn master tech
Category: Saturn
Satisfied Customers: 1,918
Experience: 25 years automotive experience, 15 years with Saturn
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I am assuming it is a crank no start? If so, check the fuel pressure after you shut the key off, if it drops, then you either have a bad fuel pump (bad check valve) or a leaky injector.

If it doesn' t crank then it is probably a bad starter motor, when hot the armature has an open or a short then when it cools down, it is OK. Common issue too

Hope this helps.

 

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Customer reply replied 8 years ago

Today they checked the fuel pressure and found it cut off totally so they replaced the fuel relay switch. Drove the vehicle 28 miles, cut it off and when tried to restart it, the switch turns over and idles for a few seconds and then cuts off. Will not restart until engine cools down, which usually takes about 3 hrs.

Saturn Mechanic: 15yearsaturnguy, Saturn master tech replied 8 years ago
Yes but is the fuel pressure dropping to zero when you turn the key off?
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Customer reply replied 8 years ago
yes
Saturn Mechanic: 15yearsaturnguy, Saturn master tech replied 8 years ago

OK if it is then either a fuel injector is leaking or the fuel pump is bleeding the pressure back into the tank. It will require testing the injectors and possibly removing the intake and pressurizing the fuel rail to see where the leak is.

The reason the car won't start is the fuel pump is losing it's prime and needs to cool off to work again because a hot dry pump gets vapor locked

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Customer reply replied 8 years ago
Sounds expensive? Makes sense though. At least maybe this will diagnose correctly and not be another guess as what is wrong. What would you say is a reasonable cost for this? I have spent close to $1000 already.
Saturn Mechanic: 15yearsaturnguy, Saturn master tech replied 8 years ago
pump may be $600.00-$800.00 or so.
If it's a leaky injector they are a few hundred dollars to replace.
Sorry but nothing is cheap to fix on these things.
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