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Anonymous Posted on Nov 07, 2017

No injector pulse

Crank no start. Check good sparks, fuel pressure but no injector pulse from the pcm pin A3 cylinder #2, pin A5 cylinder #3, and pin A7 cylinder #4. Replaced 2 computers and still have same problem. The car will start and run with the propane bottle turn on and die out as soon you turn the propane off. Run out of ideal, need help....

5 Related Answers

Anonymous

  • 25 Answers
  • Posted on Jun 25, 2009

SOURCE: 1992 mitsubishi precis and the fuel injectors will not work!

replace fuel pump and fuel filter

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Anonymous

  • 7 Answers
  • Posted on Jun 28, 2009

SOURCE: hi i have a 90 accord it wont start fuel pressure

Is it a manual or automatic?

Anonymous

  • 10319 Answers
  • Posted on Apr 07, 2010

SOURCE: 2001 honda civic ex,wont start, no injector pulse,

Injector pulses are sent from the engines computer. Have that checked out

saailer

David Burbee

  • 1871 Answers
  • Posted on Oct 31, 2010

SOURCE: honda accord 1993 car was

Hello! I need to understand the problem...Just a couple of questions to get started...When you say that you changed the igniter, do you mean the ignition coil? Have you checked for spark (hold plug to ground)...If there is a strong spark and fuel, the problem is timing...The boss is the Crank Position Sensor and it may be the problem...But first I need to be sure there is spark...When you spray starter fuel into the throttle body and the engine has a strong spark, even if the timing is way off the engine will sputter...If nothing fires, I have to believe there isn't spark...Send a comment and I'll get your Honda running.............Guru..............Saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

Anonymous

  • 22 Answers
  • Posted on Oct 02, 2012

SOURCE: 92 hond civic

Could be difernt pcms, check the pins at the connections and make sure you have the same amount of pins..

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0helpful
1answer

I'll have no pulse or power to my injectors spark is good and petrol pump running but no start on my Ford Bantam 2006 rocam motor

what does pulse mean, scope or NOid test lamp dead on injector
or the injector tips do now spray when engine is cranked
we can not see you doing the tests and matters.


symptoms. my guess African car, and no engine told, gas/petrol not told
sizes in CC or liters. 4cylinders? (roller cam sure)
2006 is GEN 3.
wiki says it is
1,297 cc and 1,597 cc Rocam (Roller Finger Camshaft)
1.3 or 1.6L which one? SOHC
Brazilian-designed Rocam engine is of single overhead-cam configuration with two valves per cylinder.

dead engine, cranks fast right but engine is dead, will not start or stay running.
won't start with quick start spray works, but will not stay running,
seems it has spark (spray works and sounds good)
starts but will not RUN, (spray lasts for 3 seconds)

so is the cam belt ignored and now slipped (if has belt, no books here)
all fuses, good
scan the PCM for DTC error test

the PCM cuts fuel (injectors) for many reasons, for sure to not catch fire.
1: all fused checked for good in all fuses boxes. as in ALL.
2:no real engine told or country told so folks can help with more exact answers
causes, injection dead ( but PCM fires them with electrical pulse)
top cause fuel pressure not to spec,
the crack a line dribble tests are no good. if dry yes but dribble tests mean zero.
the PSI (BAR)_ pressure must be at spec to the fuel rail.

that is one answser, now lets to , injector all 4 pins have no electrical pulse using noid test lamp or scope see the super fast pulse there, 5mS (0.005 seconds)
that cause is, PCM sees spark dead even if spark is good
the PCM seens throttle by wire dead if present, (no books in USA for bantam)
PCM sees CMP or CKP sensor errors, cam or crank sensors.
PCM sees IMMO failing (security key if has it)

now answer 3.
the engine compression is not 150psi and up tested. 10Bar up, not less.
on all 4 cylinder, and near even.

EGR stuck open
CAT core melted and now engine can not pump air, or run.
lots of test to do .
but I bet fuel pressure is wrong, at the rail 30psi up. for most cars
I have no PSI spec, 2bar up. fuel pressure. not zero not 1. but 2 up.
0helpful
2answers
0helpful
1answer

My 96 Cadillac Eldorado has no spark coming from quoil

quoil ? Coil ! This is a very complex ignition system ,rather replacing parts an costing yourself a lot of money do yourself a favor an take it to a ASE certified repair shop ! Could be any number of things ,from one of the two crankshaft sensors , cam sensor , ignition control module , engine computer etc.. Are there any codes stored in the PCM ? That's the first thing that should be done , have a scan tool hooked up !
The ignition system uses a waste spark method of spark distribution. During cranking, the Ignition Control (IC) module monitors the crankshaft position sensor signals. The signals are used to determine the correct pair to spark first. After the crankshaft position signals have been processed by the IC module, it sends a fuel control reference pulse to the PCM. When the PCM receives this pulse it will command all eight injectors to open for a priming shot of fuel in all cylinders. After priming, the injectors are left OFF for the next eight fuel control reference pulses from the IC module (two crankshaft revolutions). This allows each cylinder a chance to use the fuel from the priming shot. During this waiting period, a cam pulse will have been received by the PCM. Now the PCM begins to operate the injectors sequentially based on true crankshaft position. However, if the cam signal is not present at start-up, DTC P0340 will set and the PCM will start fuel delivery in a random pattern with a 1 in 8 chance that fuel delivery is correct.
The crankshaft position sensor signals are used only by the IC module. It is used for spark synchronization and to initiate reference pulses only (not passed to the PCM).
Was the Powertrain On-Board Diagnostic System Check performed?
--
Go to Step 2
Go to A Powertrain On Board Diagnostic (OBD) System Check

2

Are DTC(s) P0231, P0232, P0322, P0601, P0602, P1376, P1631, P1632 OR P1634 set?
--
Go to DTC(s) that are set.
Go to Step 3

3

  1. Install spark tester J 26792 on one spark plug wire and ground that cylinders companion cylinder plug wire.
  2. Crank engine while observing the spark tester.
  3. Repeat the above steps on at least one more cylinder.
Does the spark tester indicate a crisp blue spark on all tested cylinders?
--
Go to Step 4
Go to Electronic Ignition (EI) System Diagnosis (Ignition System Check)
When any condition is suspected to be caused by or related to the ignition control system, the first step in diagnosis should be to check for stored PCM DTCs. Diagnose all DTCs before further action is taken. If no DTCs are stored and the condition is still present, refer to the following:
0helpful
1answer

1991 chevy lumina will crank but wont start I checked the fuel pressure it squirts out good and the fuel pump sounds strong I checked spark on the coil its sparking good! I charged the battery its fully...

If you have spark at all the plugs, the crank sensor should be ok. You should use a gage to check fuel pressure? I don't know engine size? For the 3.1L engine, my info says 40--46 psi.
It is possible to have spark at the plugs, but, the computer doesn't see rpm signal. If that is the case, no fuel injector pulse. The purple wire with white tracer carries rpm signal from ignition module to pcm, that wire has dc pulse, engine cranking. If nothing there, have to check ignition module.
How long since a tune-up? Any applicable trouble codes?
1helpful
1answer

Suzuki Aerio 2004, will crank over floods out tho. Changed Plugs and Boots. New baterry too. Can smell gas @ Tail pipe. Wants to fire-but just won't catch. Where do I start looking for the answers.?

what engine? 2.3 or 2.5L?
all cylinders flooding??? spark tips on ALL dripping in gas?
check spark at all spark plugs ( ALL not just ONE)
if spark is good.
this engine is chain cam, so it makes huge noise before death.
did it?, nah
ok, so connect any $9 scan tool, and scan it. (barrow /rent.?)

you crank it for 5 seconds, not less.
and as you crank the scan tool RPM shows 250 to300 rpm and fails to start, the RPM on the tool shows you that the crank sensor is working
now release the key and do not turn off
look for DTC errors. got P0340,355? or any other DTC
that decodes to bad CMP or CKP/
yes, BINGO, the scan tool told you why spark is dead, or way off
timing,

the PCM will report Cmp or CKP errors even 1 in 6 pulses.
the PCM runs monitors against these 2 full time. and will see it fail.
and report, it, let it tell why spark is bad.
say spark is good. and still floods.
1: engine compresssion over 150psi? W.O.T?
2: flooding , i pull the fuel pump relay and crank now.
starts and runs for 3 -5 seconds, yes, that is the flood clearing
so i then try test fuel, runs perfect now (no fuel pump) ???
runs for 3 second, each test fuel usage. well good motor, good spark.
what more do you want? sure to run
so you have either insane high fuel pressure. or injectors leaking
can and does happen.
the tests are all in the FSM under injector and pump testing.
i check fuel pressure first. as its a mandatory thing.....
to factory spec. for unsaid engine.
then i do a injector leak down and balance check.
ask if you get this far.....????


1helpful
1answer

I have a 2001 Explorer Sport Trak and it don't want to start. We have checked all the sensors (crankshaft, cam trigger, fuel pump pressre is 65). What is the tank fuel pressure sensor voltage reading. ...

The first thing to check would be spark. This can be done by connecting a spark plug tester to a plug wire while the engine is cranking. The tester must be grounded to the engine block for a good electrical connection.. Your fuel pump pressure is OK.
The problem should be electrical so check
1. No voltage to the fuel injectors (blown injector fuse or bad relay)
2. No pulse signal to the injectors from the PCM (no crank or cam sensor input to the PCM, or a bad driver circuit in the PCM, or a wiring harness problem)
3. A shorted fuel injector (robs voltage from the other injectors so none will operate)
0helpful
1answer

Test: car won't start

does it crank but not start or does it just click like dead battery or starter if it cranks check for spark and fuel pull spark plug wire and insert a screw driver and hold it close to an engine ground and have someone try to crank the engine is there a strong spark and use what is called a noid light it plugs into the plug for the injectors to see if the injectors are pulsing it should blink when you try too too start the engine if you have pulse and spark check for fuel pressure there should be a service port on the fuel rail that looks like a valve stem for a tire sort of youll need a fuel pressure tester if you had no spark or pulse at tthe injectors its most likely either the cam sensor crank sensor or the computor(pcm) if only no spark change the coil if that doesnt work you might need an ignition module but that requires more testing I cant explain here see a technician if no fuel pressure remove fuel filter drain and attemp to blow air through it if you cant its clogged replace and try vehicle if no start still feul pump is bad replace pump .

hope this helped
0helpful
2answers

Have a 2003 Taurus, 3.0 engine that has a misfire on #2 cylinder. Replaced all spark plugs, wires, coil, replaced the fuel injectors, crank sensor, cam sensor, still have a misfire on #2 cylinder. It has...

What the miss there before you started replacing parts or did you replace some of them as maintenance items. Like the plugs. Possible that the parts store gave you one with a crack in it??? Also how about a vacuum leak at the intake gasket. You said you have compression. Have you tried checking running compression. A broken valve spring can cause good cranking compression, but cause no compression when it's running.
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