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To much fuel entering one cylinder changed injector but no change
1999 Pontiac Grand Am

To much fuel entering one cylinder changed injector but no change

(1999 Pontiac Grand Am)
brake was tight and tried to drive but was hard to move and then engine had cylinder 3 misfire detected took plugs out turned it over and fuel shooting out of that cylinder even after changing injector ,what else can i try?p0303 code
3 answers & 6 comments
Popular Answer
on April 24, 2013
Sure it is FUEL"shooting out" of # 3 cyl? Check it again with fuel pump fuse pulled see if fluid still comes out of 3. Sure sounds like a head gasket/head problem and coolant is what you are seeing.
UNLESS vacuum circuit for fuel pressure regulator goes to 3 then possible reg. defective. Test for fuel in vac. hose going to regulator.
Test for fuel pressure bleed off. Pressure test cooling system!
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on April 25, 2013
yes it is fuel, replaced fuel pressure regulator, got same result ,disconnected injector wire and no fuel came out cylinder,could it be the ecm ?
on April 25, 2013
Circuit from ecm to injector needs to be checked but i bet the computer is the culprit! Injector can not be pulsing but being held open. Driver circuit falt. What codes do you have now?
on April 26, 2013
i would like to try and replace the ecm but can i get a new one and just put it in or does the ecm have to be programmed ?
on April 26, 2013
Yes it has to be flashed but you can get it already done by calling NAPA with the info from the original one.
on April 27, 2013
how do i get the info off the original? by numbers on it or by use of a scan tool?
on April 27, 2013
These #'s are on the unit, it will have to be removed to see them.
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on April 24, 2013
Sure it is FUEL"shooting out" of # 3 cyl? Check it again with fuel pump fuse pulled see if fluid still comes out of 3. Sure sounds like a head gasket/head problem and coolant is what you are seeing.
UNLESS vacuum circuit for fuel pressure regulator goes to 3 then possible reg. defective. Test for fuel in vac. hose going to regulator.
Test for fuel pressure bleed off. Pressure test cooling system!
Sign in to reply
on April 25, 2013
yes it is fuel, replaced fuel pressure regulator, got same result ,disconnected injector wire and no fuel came out cylinder,could it be the ecm ?
on April 25, 2013
Circuit from ecm to injector needs to be checked but i bet the computer is the culprit! Injector can not be pulsing but being held open. Driver circuit falt. What codes do you have now?
on April 26, 2013
i would like to try and replace the ecm but can i get a new one and just put it in or does the ecm have to be programmed ?
on April 26, 2013
Yes it has to be flashed but you can get it already done by calling NAPA with the info from the original one.
on April 27, 2013
how do i get the info off the original? by numbers on it or by use of a scan tool?
on April 27, 2013
These #'s are on the unit, it will have to be removed to see them.
of Greg's Orange Auto on April 25, 2013
AGREE WITH WETRY
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on April 24, 2013
I agree with wetry
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