Question about 1991 Pontiac Grand Prix

1 Answer

Car wont start

Have fire to plugs, have great compression, will run only if you spray fuel into intake hose.has new fuel pump,fuel filter,fuel pressure regulator,new injectors,new tps,new aic,new map sensor,new maf sensor,new crank sensor,new oil/fuel switch on filter.any ideas? Thank you.BOB

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  • dreamcatc439 Mar 11, 2009

    yes the pump checked out geat

  • Shadow1989 May 11, 2010

    Fuel pump relay?  Can you hear the fuel pump kick in when you turn the key to the on position?

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  • Master
  • 1,011 Answers

Check your fuel pressure it should be 35 psi .fuel pump relays dont go out but check all fuses with test light there is a fuel injector fuse but most likely problem is your fuel pump!

Posted on Mar 11, 2009

  • mike loshbough
    mike loshbough Mar 11, 2009

    also check injector resistance it should be 4.2 ohms per side at the main connector to the fuel injectors if a bad injector it will shut off the quad driver in the computer which there will be no pulse please let me know what you find!

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1 Answer

ISO definitive eng compartment pic/diag/schematic of fuel line & line-pressure valve/access, bleed disconnects + alt intake spots 4 starting fluid, beyond air filter intake.


to remove contaminated fuel , pull a fuel line of the fuel manifold and run the pump for a few seconds
not firing is sensor , immobilizer , ignition module problem but you stat that it fires on starter fluid so that cannot be right
starter fluid is a d good way of damaging the engine
a better way is to find and fix the fault
now to try and sort out what you are saying
it is cranking so the starter is good
it tries to run on starter fluid so there is spark to the plugs
it will not run and that indicates a lack of fuel to the injectors
a lack of fuel indicates
1--- a bad fuel pump
2--a vacuum in ht e fuel system from the tank not venting properly(EVAP system)
3--- fuel pressure regulator not working and providing pressure to the injectors
4--- bad injectors --- need cleaning
dump the starter fluid , buy a workshop manual and fix the problem properly

Oct 29, 2016 | Cars & Trucks

2 Answers

Will fuel pressure regulator stop engine from starting


Yes it can if it can't maintain the correct fuel pressure. I would also check that the injectors are getting a signal from the ECM.

Feb 07, 2015 | 2003 Buick Century

2 Answers

I have a 1992 ford f150 pickup 2wheel drive it turns over and tries to start but wont it has new ignition cole new fuel pump new plugs and wires new distrubutor and cap all from napa and it still wont...


Is fuel getting tho the cylinders? Remove the fuel line at the intake manifold, put the hose in a container, try starting see how much and how fast is the fuel coming out. If normal, fuel is not the issue. If not check the fuel filter and lines. Is it getting enough air to start? Remove the air intake hose, see if it starts, if it does the air filter is most likely severely clogged.

Aug 16, 2014 | Cars & Trucks

1 Answer

Nissan xterra 2002 2.5L engine 4 cyl engine just stopped turn key can hear fuel pump turn on and spark plug and wires there's spark also checked compression test cylinders are fine 150 psi each also...


with a compression of 150 psi the timing belt will be in the right place so that can be eliminated . you need 3 things to make an engine run they are compression ( which you have plenty of --- fuel you can hear the pump but are you getting pressure in the fuel manifold and lastly spark. So have a pressure test done on the fuel manifold top check for pressure regulator --pump/ filter faults . Next check for spark at a plug lead. Check that the injectors are working . Missing just 1 of the 3 will not run an engine.

Feb 09, 2014 | 2001 Mitsubishi Galant

1 Answer

Car will start right up when cold go down road dies starts back up once hot shut off starts back up let it set ten min. wont start has spark has fuel pressure put new fuel pump in old pump did same thing...


Could be a relay or other electrical issue.
You say it has fuel pressure and spark, if that were true it should run.
So it either does not have enough spark to fire the plugs under compression, or not enough fuel pressure going thru the injectors, or not at the right time.
You might want to check for trouble codes in the computer.
There has to be something missing from the equation when it won't start. You may have to check all of the plugs for fire and try some carb cleaner sprayed into the intake to boost fuel supply to find the issue.

Sep 20, 2012 | 1989 Buick Century

1 Answer

Engine won't start


If you have spark at the right time, compression, and fuel, you should have combustion.
Was it running before you had the work done ?
Is it possible the distributor timing is off ?
You know for sure the plugs are firing, not just the coil ? And the accel pump in the carb is spraying gas ? And the choke is closed ?
A major vac leak like the PCV valve hose or intake gasket could keep it from starting.

Jul 06, 2012 | Dodge Cars & Trucks

1 Answer

I installed a new distributor and entire ignition for a 2000 Dodge Durango. It will not start.


it needs more than spark to run! You need compression and fuel too.Try spraying some throttle body cleaner down the intake while someone cronks it.If it runs on the spray,check the fuel sytem(maybe a bad fuel pump,pump relay,blown injector fuse,etc)

Jun 13, 2012 | 2000 Dodge Durango

1 Answer

Hi Car wont start .Spark plugs are new checked each one and have good spark.New fuel filter .Fuel pump is fine getting clean fuel to the injectors.Got a new air filter which I disconnected and sprayed...


Sounds like it could be. (without checking to see if you have a "pulse" at the injectors) You can usully hear a difference in the way it turns over with a cam belt issue.

Mar 26, 2011 | Nissan NX Cars & Trucks

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