Question about Mazda RX-7

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S4 13b turbo. No injector pulse? what is the best way to diagnose and rectify? Also which is the trailing and leasding plug? top or bottom?

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Posted on Jan 02, 2017

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SOURCE: well i have a 1987 Mazda Rx7 with a 13b non-turbo

public library...Chilton or Haynes auto repair manuals or

many of your questions can only be answered when the engine is apart and after visual examination.   Sorry I can't help more.

Posted on Apr 05, 2009

  • 2760 Answers

SOURCE: no electric pulse to injectors on 1994 ford f350

Im confused how do you have a direct inject diesel in a truck made 3 years before ford had such a thing 94(suposed to ) has a indirect inject diesel there is no electric wires running to the injectors there's only a pipe with very high pressure fuel running thru it
are you sure your not confusing the glow plug wires ?
they only get power to them for like 30 seconds when first starting it

whats the real problem?

Posted on Nov 06, 2009

  • 743 Answers

SOURCE: 1986 toyota 22TE turbo 4x4

May need an ignition module. With many vehicles, the ignition module send a signal to the ECM and that is how the ECM knows to send a ground pulse to the injectors.
Auto zone can test ignition modules and they do it for free.

Posted on Sep 08, 2011

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How do I solve on range rover vogue which is reading ,lamda control adaption exceeds lower limit bank 1&2.last occurrence-plausibility

I don't have a lot of experience diagnosing such faults. I think live data would be more useful than just fault codes which tend to send the inexperienced down false trails.

Lambda responses are only reliable when the other engine components are working optimally. If an injector is dribbling a little for instance, a fair percentage of that fuel will cause the lambda to react to a rich mixture and the management will shorten the injector pulses effectively making the engine run weak.

I suggest you check the precise function of the light that illuminates as some vehicles have more than one light for check engine and emission purposes.

I would also suggest you follow best practice and ensure the maintenance is up to date and competently carried out before proceeding further and carry out a thorough visual inspection of pipes. wires and cables and connections in the engine compartment.

An experienced eye using a good scanner to view live data will be the best way to a successful diagnosis.

Jun 07, 2016 | Rover Cars & Trucks

2 Answers

I have no pulse reading on the injectors first the garage said no 5 injector change then ckp sensor more more ????any idea please

Hi Stephen, Im AL the owner of Big As Auto Repair.

Stephen, here's how you diagnose if its the "Engine Controller" OR the "Wiring Itself". If you have or can get your hands on a test light, then here's what you do. FIRST: Unhook the number 5 Injector and attach the test light across the terminals of the connector. Then start the engine and see if the test light is pulsing on and off real fast. If you have no pulse at the connector that plugs onto the Injector, then move to the engine controller. NOTE: before checking the controller disconnect the negative battery cable so you don't damage the controller. NEXT: You'll need the connector still plugged in for the test, so remove the connector from the engine controller and back probe from the back of the connector the number Injector Circuit. NOTE: DO NOT probe on the side that plugs into the controller, do it from the back side. NEXT: Plug the connector back into the controller and start the vehicle. If you do not have a pulsing light then the engine controller for the number circuit is bad and will need a new controller. If you DO have a pulsing light then its in the wiring OR the connector at the Injector. If you have OR can get your hands on a DVOM which is a digital volt meter you can check which wire is at fault. Here's how. Disconnect both connectors at the Injector and the Controller and put the meter on OHM's then you can probe each wire from the Injector to the Controller to see if the wire is broken. If the meter has a beeper you will hear it beep, if it doesn't you will have a reading on the meter. When you find the wire that's broken run a wire from the Injector connector to the Controller Connector by wiring to the wire coming out of the back of each connector. If you should need further assistance please visit my auto-repair-website its free:

Dec 01, 2015 | Cars & Trucks

1 Answer

1996 mitshubishi eclipse 2.0 non turbo. It runs but has no injector pulse on cylinder 3

Check for pulse about two inches back on the wires behind the plug. Wires tend to break at the plug. No pulse, you have to trace to the ECM, check there. If it is there run new wires to the injector. Not the, replace the ECM. A driver inside it has failed.

Aug 31, 2015 | 1996 Mitsubishi Eclipse

1 Answer

Faulty Injector Pulse

THe pulse is generated by the crank shaft sensor, then it goes to the ECM, then to the injectors.

Apr 11, 2014 | 1999 Toyota Camry

1 Answer

Nissan x Trail I have 2003 Nissan X Trail 2.2

check power steering pump valves as the noise could be valve vibration from weak control springs
timing chains do not rattle it properly adjusted and the so called rattle could be the injectors/ needles operating correctly

Apr 18, 2017 | Nissan Cars & Trucks

1 Answer

I have a 1988 300zx non turbo 3.0 just replaced the ecu thinking it was the problem but its not. My car will turn over and it sparks, tested the fuel pressure and it makes 42lbs so thats not the problem...

The pulse to switch the coils comes from the crankshaft sensor via the ecu. Pulse to switch injectors comes from the CAMshaft sensor via the ecu. Check injector wiring plugs and confirm there is an ignition live of 12v at one side. Other side should have an earth pulse when cranking.Once you know which is missing you can trace the fault backwards. ( if no ignition live then check wiring, relay, fuse etc) if no earth switching check camshaft sensor and wiring.

May 29, 2011 | 1988 Nissan 300ZX

1 Answer

1986 pontiac fiero won't start, changed fuel pump and relay gas coming up, but no spray from injectors

Actually the injectors don't spray "all the time". They pulse open for a few milliseconds then close every time they are grounded by the ECM. The distributor has a pick-up coil (Variable Reluctance sensor) that provides an A/C (Alternating Current) pulse every 120 degrees of crankshaft revolution to the Ignition Control Module also contained inside the distributor. The I.C.M. amplifies, rectifies and passes along the pules as a +12V square wave to the ECM. The ECM uses these pulses to calculate RPM and determine when the engine is rotating vs. stopped. Together with this information and more from Coolant Temp., Throttle Position, Manifold Pressure and Air Temp. the computer constantly 'looks up' what the appropriate amount of time it should pulse the injectors for to deliver the required amount of fuel.
With that in mind, the injectors are supplied with +12V via a 3 AMP fuse labeled INJ 1 for 1 bank of 3 injectors, and INJ 2 for the 2nd bank of injectors. Make sure your injectors are getting +12V whenever the key is ON or they wont fire (or at least 3 won't).
If all 6 injectors have +12V and you have fuel pressure (checked by pushing down in the center of the Schrader (tire valve stem looking thing) valve and fuel SPRAYING out, and your still not getting fuel it is probably because the injectors aren't pulsing. They are probably not pulsing because the ECM is not receiving any reference pulses from the distributor. If you have spark then you are producing reference pulses.
I hope some of this explained from an actual '86 Fiero GT 2.8L V6 owner/mechanic will help narrow down your problem.

Mar 20, 2011 | 1986 Pontiac Fiero

1 Answer

2001 Ford Windstar runs rough.

remove the coil pack and look at bottom of it if it shows any cracks coil is bad very common on these vans if you have a noid light check for injector pulse on #4 if you have pulse and good blue spark most likely the injector is bad you have to remove upper plenum to get injectors out let me know how you make out

Jun 03, 2009 | 2001 Ford Windstar

2 Answers

89 s10 2.5 has fuel and fire injector has power but no pulse

injector pulse is just controlled by the ecm or computer as some would say,u said u replaced wires? did u have a fire or melt wires? ecm is known to go bad on these,had a few of these trucks back in the day.

Feb 16, 2009 | 2000 Chevrolet S-10

3 Answers

1989 Mazda RX-7 Turbo: How many spark plugs in the engine? What spark plugs should I use?

8 what was that guy thinking has he ever even looked at a rotery moter before THERE ARE ONLY 4 SPARK PLUGS in any RX-7 turbo or not and NKG plugs have always worked best for me

Dec 02, 2008 | 1989 Mazda RX-7

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