Question about 1995 Buick Riviera

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Have spark and fuel pressure, checked injector harness with a noid light - no light. Will run if I spray starter fuild in intake, just running on fluid. do I need a new pcm? All grounds seem to be ok, should I run a ground to the pcm to see if that helps?

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1997 chevrolet C1500 pickup with a 5.7 liter (VIN code R). The engine cranks but will not start. I have tested the fuel system with a fuel pressure test gauge at the fuel rail and get a 40 PSI read


As your request requires detailed information to extensive for this forum please follow the link provided below.
Second Generation CSFI
Here is some detailed information for you to look over concerning the
Vortec
GMC Chevy Light Truck Central Port Fuel Injection Diagnosis

Apr 18, 2017 | 1997 Chevrolet C1500

2 Answers

P0 308


when the engine is cool spray carb cleaner around the intake manifold

Oct 10, 2012 | 2000 Ford F250 Super Duty Crew Cabs

1 Answer

1999 Crown victoria.codes P0174-P0171 It's reactions are the following.i have to try 2 or 3 times the ignition before it start's press gas when it starts to heat up and keep running.the most crucial is...


P0174 System Too Lean Bank 2
P0171 System Too Lean Bank 1

Have you tried to work on the fuel system side? Have you tried
fuel injector cleaner from a bottle into the gas tank?

i.e., fuel filter, fuel pump, fuel pressure readings from the rail,
fuel injectors:
Fuel Injectors Testing The easiest way to test the operation of the fuel injectors is to listen for a clicking sound coming from the injectors while the engine is running. This is accomplished using a mechanic’s stethoscope, or a long screwdriver. Place the end of the stethoscope or the screwdriver (tip end, not handle) onto the body of the injector. Place the ear pieces of the stethoscope in your ears, or if using a screwdriver, place your ear on top of the handle. An audible clicking noise should be heard; this is the solenoid operating. If the injector makes this noise, the injector driver circuit and computer are operating as designed. Continue testing all the injectors this way.
CAUTION
Be extremely careful while working on an operating engine, make sure you have no dangling jewelry, extremely loose clothes, power tool cords or other items that might get caught in a moving part of the engine.
All Injectors Clicking If all the injectors are clicking, but you have determined that the fuel system is the cause of your driveability problem, continue diagnostics. Make sure that you have checked fuel pump pressure as outlined. An easy way to determine a weak or unproductive cylinder is a cylinder drop test. This is accomplished by removing one spark plug wire at a time, and seeing which cylinder causes the least difference in the idle. The one that causes the least change is the weak cylinder.
If the injectors were all clicking and the ignition system is functioning properly, remove the injector of the suspect cylinder and bench test it. This is accomplished by checking for a spray pattern from the injector itself. Install a fuel supply line to the injector (or rail if the injector is left attached to the rail) and momentarily apply 12 volts DC and a ground to the injector itself; a visible fuel spray should appear. If no spray is achieved, replace the injector and check the running condition of the engine.
One or More Injectors are not Clicking Unplug the fuel injector connector 91055p01.jpg
Probe the two terminals of a fuel injector to check its resistance 91055p04.jpg
Plug the correct "noid" light directly into the injector harness connector 91055p02.jpg
If the correct "noid" light flashes while the engine is running, the injector driver circuit inside the PCM is working 91055p03.jpg
If one or more injectors are found to be not operating, testing the injector driver circuit and computer can be accomplished using a "noid" light. First, with the engine not running and the ignition key in the OFF position, remove the connector from the injector you plan to test, then plug the "noid" light tool into the injector connector. Start the engine and the "noid" light should flash, signaling that the injector driver circuit is working. If the "noid" light flashes, but the injector does not click when plugged in, test the injector’s resistance.
If the "noid" light does not flash, the injector driver circuit is faulty. Disconnect the negative battery cable. Unplug the "noid" light from the injector connector and also unplug the PCM. Check the harness between the appropriate pins on the harness side of the PCM connector and the injector connector. Resistance should be less than 5.0 ohms; if not, repair the circuit. If resistance is within specifications, the injector driver inside the PCM is faulty and replacement of the PCM will be necessary.

Jul 10, 2010 | 1999 Ford Crown Victoria

1 Answer

1997 hyundia won't start . fuel pump tested good, spark good 1.8 will run if fuel sprayed threw air intake could it be one of the sensors?


Check injector pulsation with noid - lite, any auto parts should sell this, it plugs into the injector harness, if light flashes while cranking elec. part ok, if no flash no fuel is getting in there and will not start, if that's the case have your computer check out.

Jun 08, 2010 | Hyundai Elantra Cars & Trucks

1 Answer

1994 chevy suburban, no fuel coming from fuel


Put an injector noid light at the injector plug terminals to see if your getting a signal from the PCM(computer).If not try to find a computer from the same vehicle that works and swap it into yours to check.A PCM swap will take about 15minutes.

Sep 23, 2009 | Chevrolet Suburban 1500 Cars & Trucks

1 Answer

Have 99 sierra has spark and fuel to intake but wont start sometimes sputters but no go please help


You need to find out if you have enough fuel pressure, and if you have injector pulse. A noid light is a simple kind of test light that you can get at a parts house to test injector pulse. Unplug an injector and plug the noid light into the harness. Have someone crank the engine, if it flashes then your injectors are firing. Check all the fuses under the hood. You should have 55 to 60 psi fuel pressure.

May 01, 2009 | 1999 GMC Sierra

2 Answers

I have a 1995 impala ss with lt1 motor it wont start i changed the cap&rotor,starter,ingnition modulator,fuel filter and it still wont start


First thing I'd check is the optispark sub harness. Check both connections, the one by the optispark and the one on the passenger side of the intake manifold. Disconnect both sides and check for corrosion. This is a known weak spot on these motors.

If that checks out your going to want to start with the basics. Do you have spark and fuel? Pull the spark plug wire for a cylinder and using a spark tester test for spark while cranking. You want to have a nice blue spark. If you have good spark check for fuel pressure by hooking up a fuel pressure gauge to the shrader valve on the fuel rail. It should be in the high 40s - low 50s. If you have fuel also, check to make sure the injectors are getting a pulse using a noid light.

Apr 14, 2009 | 1995 Chevrolet Impala

1 Answer

Wont start


spark and fuel pressure at the times while it not starting? I hope so.
Will it start if you spray carb cleaner in the intake? If so we are dealing with an Injector issue Several injectors could be failing when hot It's very common also you need to hae a NOID light to verify that the injectors are being PULSED by the ECM if you have NOID and spark and fuel pressure then the only thing to do is while its stone cold. OHM all the fuel injectors and record all the reading for each cylinder.
Drive it then once it will not start, quickly do the ohms test again and record all readings again and any readings that are lower are likely bad injector windings and you need new injectors.
Any questions email me at fixincars@yahoo.com please rate this advice

Oct 03, 2008 | 1992 Buick LeSabre

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