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Car will not start. plugs fire on demand, but observed that the injector only sprays twice at engine cranking and stops, while plugs are still firing.

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Hi,


Please check the bellow links to troubleshoot your problem when your car wont start:-


http://www.familycar.com/carrepair/nostart.htm


http://autorepair.about.com/od/troubleshooting/a/ts_no-start.htm


http://www.samarins.com/diagnose/index.html


http://www.dummies.com/how-to/content/troubleshooting-a-car-that-wont-start.html



Do get back to us for any further query and do not forget to accept it.


Thanks for contacting fixya.com

Posted on Oct 14, 2010

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  • Audi Master
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That is fairly normal. The main injectors are not what the car starts on. It starts on a 5th cold start injector that is wired off the starter solenoid. There is a thermal cut out that prevents it from flooding the engine if it does not start right away. But you could also check the fuel pressure and change the filter.

Posted on Oct 14, 2010

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Posted on Jan 02, 2017

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1 Answer

Put new EC module, IT module, distributor EGR valve, coil, TP sensor and fuel pump works. The car cranks but will not fire.


What's missing ? Spark , fuel pressure , or compression. Try spraying carb cleaner into the engine ,throttle plate . Does it try to start then ? If the injectors are bad it will not start , just crank ! Videos on youtube showing how to test fuel injectors with a ohm meter .

No Start Diagnostic Basics EricTheCarGuy
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My car cranks but will not start RVR GDI mitsubishi


Check all fuses first, then with an assistant, check for spark with a spark tester. if there is spark at 2 plugs, check for fuel pressure at the fuel rail with a gauge. Engines need three things to run, fuel, spark, and compression. If there is spark and fuel, do a compression test, if the timing belt jumped/broke, you won't have any

Mar 03, 2015 | Mitsubishi Cars & Trucks

3 Answers

Car will start sometimes other times i will have to continue to crank the engine it cranks everytime


As it cranks, is there white or black exhaust smoke ?? If yes, the fuel injectors have solid build up on the tips. Normally, a quart bottle of injector cleaner treats 20 gallons. Pour 5 to 7 quarts of fuel injector cleaner. With cold engine (been parked for at least an hour or overnight), while cranking engine, have 2nd person spray starting fluid into air filter. DO NOT PRESS ON GAS PEDAL !!! Let the starting fluid do its job of starting the car. Starting fluid is highly combustible, so its important you don't give any gas while its cranking and 2nd person is spraying into air filter. When engine starts, stop spraying starting fluid and give a little gas. If engine begins to die, immediately spray a little starting fluid again. When engine begins to run, let it run a few minutes to let fuel injector cleaner to do its job (loosen solid carbon build up on tips of fuel injectors).

Mar 19, 2014 | Audi A4 Cars & Trucks

1 Answer

Car was running fine,went to store,come out turn the key,plenty of crank,but just wont fire,whats my next step?


Determine if it is an ignition or gas failure. Does the fuel pump still work? Do you have gas up to the engine? Watch the injectors for spraying a cone pattern of fuel when car is cranking-that is, if the car is throttle body injected. If multi-port injected, you cant see the injector spray, so check for fuel at the engine fuel rail, or crack the fuel line at the engine to see if fuel is under pressure. The correct way is to check fuel pressure with a gauge, barring that, see if fuel is getting to the engine. If not, pump may have quit.
To check ignition, pull off a plug wire and check for spark when cranking. Be careful of shocks, hold wire with a glove or heavy rag, push the rubber boot back to expose the metal end of plug wire, and hold the wire 1/4 inch from a metal piece on the engine. Have a helper crank the car over and observe spark jumping from wire to ground-a good spark is a blue, snapping spark. Good ignition. A weak, inconsistent, or orange spark is a sign of ignition problem, possibly a bad coil, bad ignition module (the TFI module), or other ignition component.
If you have good spark (good ignition), and still unsure of fuel, spray some starting fluid or carburetor cleaner into the air intake and crank the car over. If it runs for a few seconds and dies, you know gas is the problem. The pump has quit or the fuel filter is clogged. You may even want to try this first, cause if it tries to run, you know ignition is good, and gas is not getting to the engine. Good luck.

Mar 17, 2013 | 1990 Ford Tempo

1 Answer

2003 vibe will not start


It has good spark then? Have you pulled a plug or two after prolonged cranking to see if plugs are wet with gas? You said pump was working, have you checked the fuel pressure? Nothing in your comment about the injectors-that's why I asked if plugs were wet.

Check the fuse for injectors, verify that power is available at all injectors with key in ON. You can check the injector circuit with a "noid light" available at any parts store-different sizes, so get the one that fits your injector connector. Just plug the light in and crank the engine over. If circuit is good, the light will blink. If it doesn't blink or if it lights up and stays lit-the circuit is not right.

All of this is to see if injectors are pulsing and spraying fuel. Do the same with spraying starting fluid into the air intake and cranking motor. If engine now runs for a few seconds, then you know it was a fueling problem.

Apr 06, 2017 | 2003 Pontiac Vibe

2 Answers

1991 Olds Cutlass Ciera 3.3 v6 would start, run a few minutes fine, while cold. When warmed up it would shut off, stall, not restart. It would crank over good, but not restart. Added fuel to...


jrtvett's "unplug one injector and start" troubleshooting procedure would work if one injector is bad. If more than one injector is bad, then not so sure.
Like you mentioned, one or more injector(s) can go bad and it causes the others to stop working as well. After our experience, I am convinced this observation (fault mode) is correct (see below). Its as if upon warmup the solenoid in the faulty injector shorts, resulting in short circuit of signals to all the other injectors.
We have a 1989 Olds Cutlass Ciera with the 2.8L V6 that recently had the same fault: At least one injector went bad after warmup, then engine refused to restart. All other possibilities were eliminated, including crank shaft sensor, ECM, ignition pack, idle start valve, bad gas, rail pressure, etc.
No Service Engine light illuminated, and there were no fault codes in the ECM computer.
The jrtvett procedure could not easily be utilized in our case because all the injector connectors are underneath the intake manifold and inaccessible.
My cousin is a Ford mechanic told me of an analysis procedure Ford uses to troubleshoot injector problems. They display rail pressure on a LCD or CRT monitor and can see pressure drop with each injector's opening. Unfortunately, if the car is not starting, then this test will not be of much use. The engine has to be idling or at least all of the solenoids in all of the injectors operational to use this test. If engine won't start, then its clear none of the injectors are opening as described above, then no fluctuations in rail pressure would be displayed.
The shop that was working on our car decided to replaced all of the injectors, and the engine now runs like new.
Due to inaccessibility of injectors and fact these injectors were inexpensive ($40-$50 each), it was wise just to replace all six. Grading old injectors is not exact science.

Apr 04, 2011 | 1991 Oldsmobile Cutlass Ciera

1 Answer

97 firebird formula hard to cold start


Check the cold start injector useing a digital multimeter with a bar graph. Unplug the injector wires and insert the probes into the wiring plug, crank the engine and the bar graph should pulse if it does remove the injector and with the wiring reconnected and the injector held over a suitable container crank the engine and observe the spray pattern. If insufficient replace injector. This should be a starting point at least

Jun 05, 2009 | 1997 Pontiac Firebird

1 Answer

Question Regarding Fuel Injectors


IT IS POSSIBLE and has been done. as long as when you disable ign it does not cause pcm to disable injector pulse.when you first cut key on they will spray a shot also. it is also a good way to check for a leaking injector,see if one drips after sitting a while. however if you have fire with a noid light and injector is not hitting it is most likely a bad injector

Feb 05, 2009 | 1996 Chevrolet Caprice

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