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1996 4x4silverado it will start, but hard to start, but when

I step on the gas...
1996 4x4silverado it will start, but hard to start, but when I step on the gas it just dies
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Answered in 6 minutes by:
10/4/2013
Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 17,263
Experience: 15 years GM master tech
Verified

Welcome! My name is XXXXX XXXXX I will do my best to assist you with this problem.

im sorry your having this problem

this kind of problem is usually caused from low fuel pressure a possible plugged cat convertor and sometimes the MAF sensor

did this problem happen out of the blue one day ?

are there any codes in the computer?

do you have any access to a fuel pressure gauge ?

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Customer reply replied 4 years ago

Hi Gary it happened yesterday pulled into the gas station got gas

started the truck put it in drive went about 3 feet

and it died ,it will start but it takes a little time ,

but step on the gas it dies,I don't have a pressure gage

 

PO108 was a code that came up

90% of these issues are fuel pump failures

since it just did this out of the blue we can rule out the plugged cat convertor

unplug the MAF connector and see if it will run for you

if it does the MAF sensor or the connector to it is bad if it still does this the odds are the fuel pump has failed ( usually happens after I fuel fill it seems I don't know why but it does )

confirming this with a fuel pressure gauge is the next step if the MAF unplug doesn't work

Hans if the fuel pump is bad the fuel tank will need to be removed to change it and also make sure you install a new fuel filter !

the 108 is a MAP code and usually its set with an engine running bad any dying out

a scan tool would need be connected to diagnose that code but I think that code is set from it stalling

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Customer reply replied 4 years ago

what is the MAF,and where is it?


 

here it is in this picture

graphic

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Customer reply replied 4 years ago


ok let me go and try it

if that does not work it more than likely will need a fuel pump and a fuel filter
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Customer reply replied 4 years ago

I can hear the pump come on until it builds pressure


fuel filter Ihave a new one

did it run with the MAF unplugged ?
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Customer reply replied 4 years ago


no ,with or with out

ok at this point it has to have low fuel pressure

its more than likely going to need a fuel pump but you need confirm fuel pressure with a test gauge 56 - 62 PSI key ON engine OFF

if its below that spec it needs a fuel pump

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Customer reply replied 4 years ago

ok so where do I go from here ,its 20 miles to town


the fuel pump works ,but not putting out the pressure


 


it needs ,how can I conferm 62lb without a gauge


 


or do i need a geuinnie?

Hans I would hate to guess without knowing the PSI of the fuel pressure

but if it will not run with the MAF unplugged and since it happened out of the blue I doubt its the cat convertor it would more than likely be low fuel pressure which the fuel pump would need to be changed

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Customer reply replied 4 years ago


ok I'll have to get a pump


 


so what next?

the fuel tank needs to be removed to change the pump
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Customer reply replied 4 years ago


ok this will take a little time ,I just got gas I have a full tank


 


thats not fun


 


not something I want to start today


 


I'll start in the morning


 


so what next

next as in ?
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Customer reply replied 4 years ago

what if thats not the problem ? how do we reconect?

you can get me back through this post any time with any follow up anytime even after you rate us here at Justanswer !

I will be online tomorrow afternoon and all day Sunday Hans

Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 17,263
Experience: 15 years GM master tech
Verified
Gary and 87 other Chevy Specialists are ready to help you
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Customer reply replied 4 years ago

Hi Gary ,are you avalibal today .


you were right ,but something is not right ,the truck runs like crap


 

ok it runs but runs bad at idle? driving under speed ?
did you replace the fuel filter ?
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Customer reply replied 4 years ago

yes


I also broke one of the ear's off the disrtributor that holds the cap down


I don't know if that would cause it ,or could I have hooked up the fuel lines wrong

if the fuel lines where on wrong it would not run
yes the distibuter tab brken can cause issues
what does this do ? tell me all you can about how it runs
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Customer reply replied 4 years ago

it seems take longer to get it to start ,it hesitates and may or not die when I step on the gas ,sputters ,some back firering ,and left to idol, it


seems to die in a few minets

ok at this point we have to check the fuel pressure with a fuel pressure gauge
we have to know the fuel PSI key on engine off
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Customer reply replied 4 years ago


how do I check the fuel pressure


where do I hook it up

there is a test port to screw the pressure gaueg on the fuel line near the drivers side distibuter area
should have a black plastic cap on it almost like a tire valve
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Customer reply replied 4 years ago

Ok I found it


but I don't have a tester


so I guess I'll have to go get one


 


the little ear that holds the distributor cap to the distributor ,not the ear on the cap.


how can I fix that ??

they sell a fix kit as some auto parts stores or swap out a re manufactured complete distributer to fix it
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Customer reply replied 4 years ago

Ok I'll see what I can Find


I'll get back with you later


thanks so much


Hans

anytime
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Customer reply replied 4 years ago

Good morning Good morning Gary


well I put the tester on the the fuel line


we have 20 psi at an idel ,,,,,,whats up with that??


new pump ,new filter,?????

wow thats way too low
what does it read key ON engine off and will the needle hold on the guage ?
if its @ 20 can you unplug the connector at the fuel tank top into the fuel pump and when cranking does the grey wire terminal in the connector show 12 volts
put your meter to DC red lead into the gray wire and the black lead to the black wire when cranking does it show 12 volts ?
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Customer reply replied 4 years ago

with the key on ,engin off ,it gives me 10 psi
I'll try and get volt test


 

ok let me know
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Customer reply replied 4 years ago

Ok with the key on I have 12 volts ,when cranking it drops to 9.3

ok that fuel pump they sold you is the wrong one or defective
should have close to 60 PSI key on engine off
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Customer reply replied 4 years ago
if you show 12 volts with a meter testing like i said the pump is a problem
did you replace the complete fuel module in the tank ? or just the pump ?
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Customer reply replied 4 years ago

what is the module ? I only saw a pump and gas gauge

just being sure some late models had complete module assemblies
make sure the connection on the underside of the fuel sender is not burnt at all or any of the terminals or that connector are not burnt or melted
looking from under it where the pump wires connect to the bottom of that just disconnect it and make sure the connector is not melted at all or any burnt terminals
if that looks good they did not give you the correct fuel pump for this truck
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Customer reply replied 4 years ago

when I got the pump the first time it was for a 1996 ,


it did not work, the old pump was from a 1995 ,


so I thought someone may have swaped tanks


then it would have to be a bad pump I guess??


 

the one for the 1996 did it look the same ?
the one for a 1995 is the wrong pump in 1995 they ran throttle body injection and your 1996 has a fuel injection unit under the upper intake
the 1995 TBI used alot lower fuel pressure as for the 1995 with the injection unit used close to 60 psi
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Customer reply replied 4 years ago


no they did not look the same


they were slighty diffrent ,but 1996 would not fit in the holder


thats why I had to go back and exchange ,so am I pulling tank agin?

to change the pump you will have too
if this engine in your truck has the injection unit under the intake maniold
this has to have the 1996 pump out in it as a 1995 will not make the pressure it needs
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Customer reply replied 4 years ago

Ok what does the injection look like ?

like this with the # 2 big plug like in the picture
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Customer reply replied 4 years ago

yes it has one

ok if it IS just like the picture you have to put in the 1996 pump to get the correct pressure
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Customer reply replied 4 years ago


well why then did it run so good before

hard to say but that fuel pressure is way too low
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Customer reply replied 4 years ago


It was the map sensor ,old fuel pump is good


my 14 year old next door fixed it.crazy huuu


anyway thanks for the help

any time

im so glad its fixed

 

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Gary
Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 17,263
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