Question about 2002 Pontiac Grand Am

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I have an 02 grand am. Just changed fuel pump, now it won't run longer than 10 seconds and stalls. Big voltage drop on positive side. any suggestions

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  • Pontiac Master
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Positive side of what ? fuel pump circuit ? How much voltage drop ! GM Fuel Pump Relay Testing

Posted on Dec 12, 2016

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6ya6ya
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Posted on Jan 02, 2017

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66 chrgr
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SOURCE: UNKNOWN PROBLEM

have your ignition switch replaced this will fix the issue.very common!

Posted on Apr 23, 2009

lastech
  • 408 Answers

SOURCE: STALLING PROBLEM TURNED INTO NO START 1990 MB 300 SL

hello,good day,first we are in fuel side,better to install a fuel gauge,to determine the right pressure, is not mention your fuel pump relay,this should also check,some occasion the power supply is missing,now if all is in order (fuel side) then your switching unit(transistor box) need tobe check,assuming your engine is 103 engine,ty

Posted on May 19, 2009

roniecon
  • 6927 Answers

SOURCE: 98 grand prix gtp starts runs for a few seconds

may not be fuel related,replace crank shaft sensor,if it isnt that ,,,ignition module

Posted on Jul 05, 2009

  • 1 Answer

SOURCE: 1996 Grand Cherokee intermitant stalling

i've tried all the above solutions and still experiencing the same problem. in doing some research it may be an electrical problem, the bolts holding the firewall may be grounding it before it should be and with expansion and contraction of metal in different weather conditions may help explain why it doesn't happen all the time. try messing with that

Posted on Jul 10, 2009

  • 107 Answers

SOURCE: Fuel problems

t.p.s. censor

Posted on Jul 20, 2009

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2005 Saturn vue wants to fire but won't. Battery reads 12.2.volts prior to starting and drops to 9 volts when trying to start. replaced cap and it started on first try. it had a rough idle before...


Unfortunately the answers you have given for replacing a cap is too vague. Is it a gas cap, radiator cap, air conditioning service port cap.... Look the battery needs charged that is why the battery drops to 9 volts, a good charged battery should drop to 10 volts. Check your battery terminals or cables for corrosion. Do a voltage drop tests on both positive and ground cables. As far as not starting any more...do you mean not cranking as in no starter eengagement or cranking but not running? If it is not running listen to hear in the first 10 seconds to the fuel pump relay if it engages or listen for fuel pump...is the car getting spark?

Feb 27, 2015 | 2005 Saturn VUE

1 Answer

I have a 1994 wrangler 2.5 liter m.t...I just had the motor rebuilt and runs great. A week later it starting to quite suddenly. I would waite 20 minutes and it would retart. When it quits it has no spark,...


a fuel pressure gauge is $20
if pressures ok at fail, then it s NOT PRESSURE problem
(physics here)
you could by a scan tool (obd1) and see what happens at stalls.

one way to find stalls for sure pre 1996 is to measure voltages
on the ASD relay (the stall relay, LOL)
it if drops just before the stall that means the stall was
ECU COMMANDED.
and if the ECU commanded it , it knows why and will tell you why.
if the stall is not due to ASD drop
then its may other causes.
when you said it had no spark, i bet $10 you did it wrong,?
takes 2 persons, one at key other testing
if not you can NOT run from key to spark plugs, in 2 seconds
the ASD drop out rules.
yah cant
rule 1: key on and see the ASD close, (voltages)
it must close for 2 seconds cranked, must
and just stay closed, cranked, or if in 2 seconds it drops out
'that means the ECU dropped ASD for CAUSES, 1 to 8 reasons
the VTSS reason is not it, your car has no Immoblizer. feature.
http://jeepdied.com/no-start.html

here is a list
engine bad, low compression on 1 or or cylinders. (ask how)
spark is bad, ever get a tuneup this decade? FULL(spark parts)
ASD dead.
ASD drops early
ASD can drop at 80mph, so, ASD is always suscpec
loss of 12vdc power to the EFI system at any time it will stall.
can you save the stall with fast right foot, this test is like magic
in the diagnosis world, can you?
is engine flooding spark tips soaked, x4?
use wide open throttle to cut fuel cranked clears all floods i jeeps
(baring injector leaks sure)

what is ASD (all jeep stalls, read this first)
what does it do, and how, and why,
are all here
http://jeepdied.com/ASD.html

Mar 24, 2017 | Jeep Wrangler Cars & Trucks

1 Answer

1995 ford contour cranks but won't start, change fuel filter, fuel pump, and spark plugs. Not getting any spark.


Have you ever heard of testing before replacing parts ? Fuel pressure an flow tesing , testing the electrical circuit for the fuel pump , amp draw testing , voltage drop testing etc... Thier are no magical fixes in auto repair . No spark ! check B+ voltage an ground circuits for the ignition system , Ignition System Designs Operation and Testing an SD Premium video

Jun 18, 2017 | 1995 Ford Contour

3 Answers

My 96 jeep Laredo will not turn over. I've checked


sorry turns over means ZERO
the crank shaft can spin or not
the starter can in fact spin and crankshaft not.
and some think turns over means, engine runs. now that fact makes turns over, a dead statement.

the word is cranks over, the engine cranks over robustlyl
and then the engine runs.
then runs for more that 3 seconds, and the ASD relay holds. (step by step his works like this ,93 to now)

wont crank ? (clear statement in fact)
cranks ok, (crank shaft spins fast) can be seen and heard.
runs for 3 seconds? and stalls (ASD relay drop out) can be seen.
runs for 5min and stalls. (complex)
runs for hours and stalls. (even more complex)
all are key facts to the solution.

tell more..... tell all it does good bad or ugly
for better suggestions!

Jun 06, 2012 | 1996 Jeep Grand Cherokee

1 Answer

2000 GMC Jimmy, starts up every time, but only runs for 10 seconds then dies. Restarts every time but will not stay running. Replaced fuel pump, fuel filter, CAM position sensor, crank position sensor,...


you say fuel pressure is good, but what is it? what is the fuel pressure when it stalls out? Spec is 60-66 psi and it wont run if its 55 psi. the fuel pump relay should be good if the pump runs. Make sure the ground for the pump is good , G402 should be on left frame rail. you may have had it off to replace the pump? maybe? it may be time to stop guessing and have a repair shop diagnose it for you. You sure have replaced a lot of good parts.

Sep 07, 2011 | 2000 GMC Jimmy

1 Answer

1999 Mercury Grand Marquis. with KOEO, voltage to fuel pump is 6.58 volts. Battery voltage is 12.47 Vdc. Removed fuel pump and installed jumper wire and fuel pump receives battery voltage. Why is voltage...


With my pump failure, I read the exact same 6.5 v at the inertia switch in my trunk with the key in the "on" position and engine not running or cranking. When cranking, the voltage to the pump jumped to +12V and if the engine did run, the voltage should stay at +12V.

The Ford manual states +12v should be at the motor for some number of seconds in the key "on" position then drop off if the engine is not cranking or does not start. In my pump failure case, I never saw 12V at the inertia switch in just the key "on" position, only +6.5V as the +12v fuel relay under the hood never engaged and/or stayed latched on.

In my situation, I measured an open circuit at the pump motor winding and suspect the +6.5V I was reading came from the Powertrain Control Module. I am also guessing if my pump winding was not open, the +6v voltage would have been +12v for a number of seconds for fuel priming as the fuel pump relay is temporarily energized, then drop to zero (relay off) if the engine does not continue to crank or run.

With my pump motor winding open, the Power Control Module may not have been loaded properly to function (reading +6.5 floating volts instead) in the key "on" position and therefore never climbed to the full +12V. There obviously was no fuel pressure at my schrader valve on the fuel rail when cranking which indicated an open wiring circuit (splice, ground or connector) or open pump winding. The 12v I was reading when cranking at least indicated the fuel pump relay was working.

With my new pump installed, I listened for the pump running in just the key "on" position. I believe I barely heard it running after the repair as it was running very quietly which indicates the +12v was there which supports my theory.

Dec 13, 2010 | 1999 Mercury Grand Marquis

1 Answer

96 s10 2.2 4cyl. running lean . It has new fuel pump and fuel filter. I've checked the converter, new 195 degree thermostat,changed fuel regulator,changed front 02 sensor, changed coils and Diagnostic tool...


I know you said new fuel pump and filter but I would recheck the fuel pressure. Drive the vehicle with the fuel pressure gauge on it and see if the pressure drops after 10 minutes.

Sep 02, 2009 | 1983 Chevrolet S-10

1 Answer

'92 chrysler new yorker salon is stalling after about two or three minutes after starting, what could be causing this?


Bad fuel pump,have the presure checked,turn the key on,wait 10 seconds,and see if stays running longer,if it does,its your fuel pump.have it changed.First,change your fuel filter.

Jul 26, 2009 | Chrysler New Yorker Cars & Trucks

1 Answer

STALLING PROBLEM TURNED INTO NO START 1990 MB 300 SL


hello,good day,first we are in fuel side,better to install a fuel gauge,to determine the right pressure, is not mention your fuel pump relay,this should also check,some occasion the power supply is missing,now if all is in order (fuel side) then your switching unit(transistor box) need tobe check,assuming your engine is 103 engine,ty

May 17, 2009 | 1987 Mercedes-Benz Mercedes Benz 190 Class

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