Question about 1994 Pontiac Grand Am

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Cold starts and runs fine for 10 min. quits suddenly has good spark and no fuel.pump and filter are good.no pulse voltage at injectors while cranking.crank sensor is good or would not have spark.bad pcm or ecm? are they 2 different units are together?

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  • Pontiac Master
  • 3,187 Answers

Check the injector relay and fuel pump relay. also check the fuel pressure regulator is working.

Posted on Oct 17, 2013

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teds_repairs
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SOURCE: help with 95 firebird 3.4 no start

you have fuel pressure but the fuel pressure regulator can be bad

Posted on Nov 23, 2012

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1998 f250 5.4l would not start. changed feul pump and filter still would not start. 20 mni later started. was cleaning engine while running 10 15 min later died wont start.


Check fuel pressure at the injector rail. Could be your fuel pump relay is cutting out. If fuel pressure is good, check for sparks at the plug wires. Read the link below for more info.
Do It Yourself Diagnosis and Repair

Jul 26, 2017 | Cars & Trucks

2 Answers

No battery problem either


My guess is that after it ran out of gas, the key was in the forward position for a while and you unknowingly interrupted the antitheft system. Try to reset it.

RELEARN PROCEDURE:
Turn the key on, with the engine OFF.
Try to start the engine, then release the key to ON, Engine will not start.
Watch the security telltale, after about 10 mins, it will turn OFF.
Turn OFF the ignition, and wait 5 seconds.
Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes. You must turn the ignition OFF for 30 seconds before attempting to start the vehicle after the 3 cycles. Then start the engine .


Do It Yourself GM Security bypass
26307316-p5gn0s2jo44dkhw0s1rtkrnt-4-0.jpg

Oct 10, 2016 | 2000 Chevrolet Cavalier

2 Answers

07 chevy cobalt 2.2L no injectors pulse!the fuel pump works fine!when I spray starter fluid inside the throttle body & than the want to start...NEED HELP PLEASE!!! LIKE A.S.A.P


Hi,

I would check n replace the fuel filter if needed. Also, it could be one of the spark plugs. Was it running before? Can you think of anything that happened or changed recently?

Aug 08, 2016 | Cars & Trucks

2 Answers

Runs good, after 30 mins stalls no injector pulse and hard to start.after 10-15 mins starts again, spark OK. changed fuel pump,distributor. Same


run the fault codes and check for problem ECM
There is an electronic component failure in the injector circuit that when over heats , shuts that injector circuit down
try replacing the ECM with a known good unit

Dec 09, 2015 | 1988 Ford Tempo

1 Answer

I have no injector impluse


no injector pulse - DodgeForum.com

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Oct 23, 2015 | Dodge Cars & Trucks

1 Answer

What causes o low injector pulse


Is that static pressure with key on, engine off? Or engine running pressure? Both should be near 60, usually key on, engine off pressure will be about 3 or 4 psi higher.
If it runs good after starting, the injector pulse must be good. No reason why starting and running pulse should be different. Only difference is when running, fuel pump power is kept on by the oil pressure switch, whereas in starting, the fuel pump relay keeps the pump on. Very unusual, let us know. Measure voltage at one of the injector's power wire with key on. It should be battery voltage or very close.

Aug 22, 2015 | Cars & Trucks

2 Answers

Turns over wont start


It sounds like there is no pressure in the fuel rail. The cause is the fuel pump is not working. I had one like that and the pump was running but not pumping. Check to see if the FP is putting out.
Good luck.

Dec 15, 2013 | 2000 Chevrolet S-10

1 Answer

Runs min shuts off


Sounds like a fuel pump failure

Check for Codes
Check Fuel Pressure,listen for pump at the tank
Check for Spark or Injector Pulse
Check Battery Voltage & Alternator Output

Your loosing one of them or other things

Aug 29, 2013 | Ford Cars & Trucks

1 Answer

Started ran for awhile then died an wont start


Start with the simple and replace your fuel filter, a dirty filter can cause your engine from starting. At worst, your fuel pump has failed and will need to be replaced. Before replacing the fuel pump, inspect all the fuses and wire leads from the fuel pump harness. Note: that the ground wire is separately grounded at the frame, so inspect that for any damage due to corrosion.

You need 3 things.
Compression
Good hot blue spark to all plugs.
Good gasoline and proper fuel pressure. 63-64 lbs.
If you have all 3 then move on to injector pulse to all injectors. I think each injector is on a seperate driver on that one. Check for pulse to all of them.

You may be weak on fuel pressure, even a couple of lbs low on a cold start will cause a no start. Double check cold start cranking fuel pressure. If under 63-62 lbs you have problems. One test is to give it a squirt of carb cleaner not starting fluid. If it starts then you have a fuel pressure problem.
Run the full fuel pressure test, here is the guide lines on testing.
Hard to start cold.
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure. Later V6 and V8 gm engines should have 60-66 fuel pressure.
* Cold start should be 64-65 lbs of pressure. If you do not have full fuel pressure on a cold start the injectors will not squirt fuel.
* Engine running should be 60-66 lbs pressure depending on engine load.
* Full pressure with return pinched off should be 75-85 or more. and if it has a fast leak down after shut off you have a leak.

The 75-85 is only a check on the capable full pressure of fuel pump. If you can not find the rubber return line check full pressure by plugging return line or just or the true full pressure can be taken direct at the end fuel filter.

Mar 18, 2010 | 1999 GMC Sierra

1 Answer

Chevy S-10 Start problems


If hall effect switch was bad you wouldn't get any spark.What year 2.5L is this?Is this a 2 injector Throttle Body? The pink wire on top of injectors comes thru a 20Amp fuse controlled by the Ignition switch you should have battery voltage with key on The dark green and dark blue wires come from the pcm which are called injector drivers the drivers supply a pulsating ground if you crank the engine with a test light between either pink/dk green or pink/dk blue test light should flash dimmlythat would mean injectors are being driven but there isn't any fuel at the injector or the injectors are bad no pulse means either a bad computer ( which these drivers are known for going bad)or the computer isn't being commanded to fire the injectors.

Aug 22, 2009 | 1988 Chevrolet S-10

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