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milt dieckmann Posted on Oct 16, 2013
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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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Russ Hill

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  • Pontiac Master 4,057 Answers
  • Posted on Oct 17, 2013
 Russ Hill
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Check the injector relay and fuel pump relay. also check the fuel pressure regulator is working.

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Anonymous

  • 2101 Answers
  • Posted on Nov 23, 2012

SOURCE: help with 95 firebird 3.4 no start

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

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My 98 S-10 aks like there isnt anyfuel going to the throttle body, but ther is. fuel pump, filter are well. -please help

If it's a fuel issue, did you check proper fuel pressure? Engine cranking is the fuel pump running? Did you check voltage and ground for the fuel pump. I've seen fuel pumps that would run, but, wouldn't make proper fuel pressure.
Engine cranking, you have spark at the plugs and fuel injector pulse?
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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.
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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 .


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2helpful
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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
1helpful
1answer

I have no injector impluse

no injector pulse - DodgeForum.com

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1helpful
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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.
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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.
0helpful
1answer

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
0helpful
1answer

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.
2helpful
1answer

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.
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