Whats the problem - Team Camaro Tech
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post #1 of 9 (permalink) Old Sep 7th, 10, 09:33 PM Thread Starter
Preston
 
Join Date: Sep 2010
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Exclamation Whats the problem

my 95 camaro 3.4 will start and run fine if you prime the intake with a mist of fuel. like i said once it starts it runs fine..dont hear the pump run when i turn on the key...could this b the relay and where exactly do i find the relay for the pump..if you dont think its the relay i would appreciate any and all suggestions
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post #2 of 9 (permalink) Old Sep 8th, 10, 03:08 AM
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Re: Whats the problem

Buy a Haynes manual for the car, it will show where the f/pump relay is at for you to touch.

Once the engine starts, does it continue to run? If it does, the pump is getting power through the oil pressure switch, I believe.

When the ign switch is turned on, the PCM sends out a control signal for the f/pump relay to close to energize the pump. It could also be a loose ground on the other side of the relay coil.

As most devices are PCM controlled, the relay coil has battery power on one side of the coil, and PCM supplies voltage to the other side of the coil, the relay is open. When PCM closes the relay, the one side of coil power from the PCM, goes low by PCM action and closes the relay. So, the driver for the relay inside the PCM may be broken, and PCM replacement is the solution. But hopefully, it won't be this condition of damage.

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post #3 of 9 (permalink) Old Sep 19th, 10, 10:07 PM Thread Starter
Preston
 
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Question Re: Whats the problem

ok so the car does run if you prime it and im with you on it running off the oil pressure switch but the pump kicks on when you turn the switch on the pump runs as its supposed to but when you turn the key it starts then dies but if you prime the intake its fine??????does this help you understand my problem any better...thanks for your reply that was a well educated responce on other sites ive got off the wall answers..sorry for the long post but this car is driving me nuts lol thanks again
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post #4 of 9 (permalink) Old Sep 20th, 10, 04:18 AM
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Re: Whats the problem

Closed one of your threads because it was the same question... merged the two together.

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post #5 of 9 (permalink) Old Sep 20th, 10, 05:38 AM
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Re: Whats the problem

If pump works for a couple seconds with the key to IGN, good sign - PCM drvr is good, fuel pump is good, and relay is good as it is being controlled by the PCM.

Relay is controlled by two parallel paths one- PCM; two - oil pressure switch. Usually crank for some time to get oil pressure up to close switch to energize.

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post #6 of 9 (permalink) Old Sep 20th, 10, 08:13 AM Thread Starter
Preston
 
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Re: Whats the problem

thanks for the help you all have a great commutity and im going to take the car to a garage tomorrow morning and i will post the results so maybe one of you never have to go through this with your Camaro
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post #7 of 9 (permalink) Old Sep 23rd, 10, 09:17 AM Thread Starter
Preston
 
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Thumbs up Fixed finally

ok so this problem never puzzles anyone else the key switch was worn and when it died it was because u let the pressure off the key causing the resistor to lose connection...it took the garage 30 min to find the problem and 1 hour to fix it so all parts and labor left a $135 bill but the car is perfect now
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post #8 of 9 (permalink) Old Sep 23rd, 10, 09:24 AM
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Thumbs up Re: Whats the problem

Thanks for the follow-up post

Second time this week I've heard of a 'bad ingnition switch' causing a non-start condition in a GM product - after years of never hearing it was the problem ...

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post #9 of 9 (permalink) Old Sep 23rd, 10, 09:36 AM Thread Starter
Preston
 
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Re: Whats the problem

Quote:
Originally Posted by Vintage 68 View Post
Thanks for the follow-up post

Second time this week I've heard of a 'bad ingnition switch' causing a non-start condition in a GM product - after years of never hearing it was the problem ...
thanks ...it was so puzzling to me...i can do some mechanical work myself but everything i could think to check was fine so i finally had it hauled to the garage and the fixed it so easy i felt dumb but now my Camaro is on the road where it belongs..Camaros are killing the mustangs with their nicer interiors and more sleek body lines so noone should ever let one sit...get out there and fix your Camaro
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