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96 express van starts but quits after 2-3 seconds
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joekatona
Novice
Sep 5, 2016, 9:39 AM
Post #1 of 16
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96 express van starts but quits after 2-3 seconds
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1996 chevy express van 5.7 liter vortec 150000 miles
engine cranks well
starts for approx 2-seconds and quits
fuel pressure goes to 60 psi when key is turned on
holds 55psi when cranking
fuel pump is less than 18mos old
fuel filter is clear
spark is good
only code is p0102 maf ( replacicing maf did no good) ans p0102 will not clear
Starter fluid will keep engine running ( but why no fuel ???)
no other codes
tps is working on scan tool
coolant temp sensor reads proper coolant temp on scantool
took off injector plug and probed for power test light showed power and blinked while cranking
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 5, 2016, 10:06 AM
Post #2 of 16
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Re: 96 express van starts but quits after 2-3 seconds
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Somehow I know I'll be wrong but recall '96 Vortec's need 60-66 PSI to stay running well or start. Have watched them drop below 58 by memory and engines stall, run poorly and much lower won't run.
Fuel pump quality varies and if run dry or low level new can be junk in no time.
Codes can mislead when engine doesn't run well for lack of proper fuel delivery for any reason and you have one,
Double check that but think that's right,
T
(This post was edited by Tom Greenleaf on Sep 5, 2016, 10:08 AM)
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Tom Greenleaf
Ultimate Carjunky
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Sep 5, 2016, 10:11 AM
Post #3 of 16
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Re: 96 express van starts but quits after 2-3 seconds
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Sorry for second post. Check battery as well. If it's not strong or delivers correct voltage/amps while under load of cranking it too can cause low fuel pressure. Never witness battery voltage lower than 9V at worse while cranking or trouble there,
T
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kev2
Veteran
Sep 5, 2016, 10:27 AM
Post #4 of 16
(1249 views)
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Re: 96 express van starts but quits after 2-3 seconds
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lets do a quick look at MAF
KOEO is there 12v pink wire ?
is blk wire a good ground?
let us know....
THe engine run @2 seconds Has me thinking the fuel pump relay is timing out - no CKP signal.
Does the oil pressure gauge work?
If applicable does tach work?
Might try swapping relays - fuel pump with AC or horn for a test, How is your electrical skills - looking at relay terminals and cavities - maybe jumping relay OR can you see the red fuel pump prime connector?
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joekatona
Novice
Sep 5, 2016, 11:05 AM
Post #5 of 16
(1241 views)
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Re: 96 express van starts but quits after 2-3 seconds
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maf has 12 volts
oil pressure goes to 40 psi during the short run time
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joekatona
Novice
Sep 5, 2016, 11:11 AM
Post #6 of 16
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Re: 96 express van starts but quits after 2-3 seconds
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All data flow chart says 60psi when key on for 2 sec
last time I replaced fuel pump it showed 60 psi when new ( don't remember the cranking psi )
I too have seen 60-66 in a few articles
The 2 prior fuel pumps would run the vehicle after using starter fluid to get going
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joekatona
Novice
Sep 5, 2016, 11:13 AM
Post #7 of 16
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Re: 96 express van starts but quits after 2-3 seconds
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I appreciate yor input Battery is aok
it is aok to be long retired ( experience is everthing )
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 5, 2016, 12:02 PM
Post #8 of 16
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Re: 96 express van starts but quits after 2-3 seconds
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Here is the spec according to Alldata
Central SFI 415 - 455 kPa (60 - 66 psi)
You need to determine if you have injector pulse during this problem.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Sep 5, 2016, 12:04 PM)
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Tom Greenleaf
Ultimate Carjunky
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Sep 5, 2016, 12:10 PM
Post #9 of 16
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Re: 96 express van starts but quits after 2-3 seconds
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Guessed right on pressure anyway.
About voltage. Yes you can get your 60 PSI for starting and should be running so quickly the alternator then is the running voltage.
Extended cranking or weak power drops below limits and pump can't maintain the minimum now even with starting fluid so it's pressure delivered is quite low for this if your reading is accurate also see how it goes up with engine running - it should and not even with starting fluid so points to bad pump for now,
T
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Hammer Time
Ultimate Carjunky
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Sep 5, 2016, 12:35 PM
Post #10 of 16
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Re: 96 express van starts but quits after 2-3 seconds
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If it is maintaining 60PSI thoughout, it's not likely a pump problem. Find out about the injector pulse.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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joekatona
Novice
Sep 5, 2016, 12:35 PM
Post #11 of 16
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Re: 96 express van starts but quits after 2-3 seconds
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How does one determine test injector pulse ??
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Hammer Time
Ultimate Carjunky
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Sep 5, 2016, 12:39 PM
Post #12 of 16
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Re: 96 express van starts but quits after 2-3 seconds
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It's a little trickier on that engine because you have to locate the right wires but you use a noid light bulb while cranking and it should flash.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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joekatona
Novice
Sep 5, 2016, 1:10 PM
Post #13 of 16
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Re: 96 express van starts but quits after 2-3 seconds
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I thought the noid light only worked on earlier models
The 96 is the start of csfi I think and am unsure where to hook the light ( if even possible)
I have ordered a fuel pump on the net because they are no longer in stock at advance etc
I know it will be relatively easy to drop the tank since I have done it twice before
I will post back to let everyone know
Thks Joe Katona
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Hammer Time
Ultimate Carjunky
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Sep 5, 2016, 1:12 PM
Post #14 of 16
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Re: 96 express van starts but quits after 2-3 seconds
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OK, do it your way.
I hope you have deep pockets.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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joekatona
Novice
Sep 5, 2016, 7:27 PM
Post #15 of 16
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Re: 96 express van starts but quits after 2-3 seconds
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Luckily fuel pump is only 85.00 for aftermarket
Pressure while cranking does fall to 55 and possibly 52
The original was Delphi and failed at approx 100thou
I put in a Delphi and it lasted 18 months
Third one was an airtex less than 18 months
If I can get it rolling and it lasts 18 mos I will likely then be retiring the vehicle
I thank all for good input and will post back after install
Joe
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Hammer Time
Ultimate Carjunky
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Sep 5, 2016, 7:32 PM
Post #16 of 16
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Re: 96 express van starts but quits after 2-3 seconds
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Why would the pressure drop when cranking? If it hit 60PSI with a 2 second prime, it should have easily maintained when the pump re-engaged cranking, unless it doesn't engage when cranking.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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