Question about 1992 Honda Accord

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I tested my injectors and all are good but the # 1 injector when the car is running and I unplug it it doesn't do anything it contiues to run

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  • cheap repair Sep 28, 2010

    check for resistance and compare to a good injector



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I'm guessing the number one cylinder is not working and the vehicle runs poorly?

listen to the injector with a screwdriver. The metal end touching the injector and the handle end near your ear. Can you hear it clicking like the other injectors?

If you think you have the problem identified as the injector being bad there is a do-it-yourself trick to confirm the problem is the injector. Carefully remove the injector rail (the rail is under pressure so be careful and aware that gas can come spraying out of it at anytime. This should be done on a cold engine and outside away from any building just in case it catches on fire!!! Anyways swap the #1 injector with any other injector and then reinstall the fuel rail. If the misfire moves to the cylinder that has the number one injector installed in it than you have confirmed that the injector is bad. If the misfire is still on the number one cylinder you'll need to dig a little deeper.

Posted on Sep 28, 2010


Compare OHM Readings to other injectors (may not show any difference,but try it)
Put the connector next to #1, on #1 and see if it fires. No, Injector is bad
Yes, #1 harness issues,work your way back to the computer and check connectors.

Posted on Sep 28, 2010


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1 Answer

2009 ranger 700 code 51. how do i fix it?

A code 51 is an injector code. It could be a broken wire at the injector (typically very hard to diagnose because they break right at the injector body)......but more than likely it is indicating a broken wire to the TPS. Check the TPS wires very closely for signs of cuts or bare spots. I'd rule out the TPS before moving onto the injector.

It could also indicate a weak fuel pump (unfortunately a very common problem). Check the fuel pressure. It should manitain 39 psi throughout the RPM tange.....including under a load and when hot, so be sure to test it with the machine thoroughly warmed up.

Mar 01, 2018 | Cars & Trucks

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How to remove and clean fuel injectors

can be lots of things. (gas engine, size not STATED)
not just injectors.
here is what we do and not waste time (hard work) on them.
1: ENGINE COMPRESSION TEST. W.O.T. (or leak down tool)
2: we do the 60k tuneup now, you know, the old drill. spark plugs, cables cap and rotor, wow, spark is good and the misfire is gone..
(like the oldest story on earth, on cars)
3: fueling.
is one cylinder dead,? is one spark plug wet.
did you do the dead cylinder tests, ( shorting a spark plug or use any IR pyro temperature gun tool pointed to the exhaust ports to see if they are all hot near same?
in the olden days, finger near there , told me that, but if you slip you burn fingers , fast forward to day the tool is $15 and not burns.
i make sure all injectors are firing next.
i use a NOID lamp at each injector
i check all injector coils for 10 ohms or all the same.
i listen to each injector with my $5 stethoscope, click click.
if all that passes, i then do the injector balance test using
my $20 fuel pressure guage. (ask)

to panic an remove the injectors is covered in the FSM

the process is the same on all MPI engines.
1: pull battery neg lug.
2: discharge the fuel line pressure using FSM method.
do not do this indoors or near valuables. or near fire.
wear goggles, have fire extinguisher near by. and a blanket.
3: unplug all injectors.
4: unbolt the fuel rail.
bam, they are all free. to yank out.

good engine
good spark
good fueling, in that order or waste huge time and effort and wasted parts.

Mar 06, 2014 | 1994 Jeep Grand Cherokee

1 Answer

Started engine and was running rough Check engine lamp came on Used code reader and found code p0306 Remove plugs Compression test no.6 was 175 and the rest were 150 replaced spark plugs and retry Still...

You've done a great job of trouble shooting thus far. I would certainly suspect the injector after all of that. But, I didn't see anything about you replacing the spark plug itself. I would try that first as a crack in the insulator (even hairline) will cause mis-fires. If the spark plug doesn't fix the mis-fire, it cold be caused by a bad fuel injector, bad signal (like a loose harness or bad wire) to the fuel injector, or a leak or valve issue on that cylinder.

Nov 25, 2011 | 1994 Ford Mustang

1 Answer

Car runs perfect cold. when it hits running temperature #1 cylinder cuts out but still has spark. could this be a injector problem


Might be the spark plug. Or injector as you said, And i would suggest that you test the injector and see if it
does functions. Good luck

Jul 16, 2011 | 1996 Honda Accord

1 Answer

1992 300ZX: I Have a 1992 300zx and it doesnt sound right, and...

spark plugs, coil packs, fuel injectors and all the wires that connect to them. you can take a multimeter to check them. a good working fuel injector should run at 14 ohms. if your injectors have ohm'ed out over specs, they need to be replaced. You can check and see which is the culprit by doing a power balance test. With the engine running pull the connector to the ignition coil, if the idle stumbles then that coil is working properly. On the other hand if it does'nt then either the injector or the coil is bad.

You can check a single fuel injector on a 300zx by using a multi-meter, which you can purchase at any local electronics shop, auto parts store, etc. Make sure the ignition is completely off, and locate the injector you want to test. This is all made easier by removing the engine cover, 4 hex screws secure the cover. From this point we have two different paths, 1. deals with the old style injectors, and 2. with the new style, please read on. 1.Now that you can see a little better, try to find the metal retaing clip around the plug on your injector. These are a pain to remove, and easy to lose, I set a small magnet near the injector so it could catch the clip once I pried it off. The easiest way I found to remove the clip was to take a small flat head screwdriver, and push the clip back in the groove from the opposite side of the motor that I was working. After making enough room to slide another screw driver into the back of the clip, pry the clip loose, and you're ready to pull the plug on the injector. After many years the plugs can get stuck on so it may take a little force to get it to come loose, just be careful not to damage the wires or plastic. 2. The newer style injectors come with a built in plastic clip that makes it much easier to remove, just depress the plastic tab, and pull, just be careful as these tabs have a tendency to break after they've been weathered for 5+ years. Now on to the testing. 3.MAKE SURE YOU DO NOT START THE CAR WHILE AN INJECTOR IS UNPLUGGED, DO NOT UNPLUG AN INJECTOR WITH THE CAR RUNNING THIS HAS BEEN KNOWN TO FRY ECU'S With the plug removed you should see two small metal points in the top of the injector, these are what we're going to be testing. Pull out your multi-meter, turn it to the setting for OHMS, resistance, or if you are totally electronically illeterate, the horeshoe looking symbol. Make sure that your two test leads, typically one red and one black are touching the metal points on the injector, if need be, clean out the area around the metal points with some canned air or a compressor as corrosion often occurs here, and look at your test meter. If it shows 13, your're perfect, the injector is still sitting at the baseline for a new injector, there is a range of resistance that will work for your injector, I believe it's 6.0ohms to 13.0ohms, but don't quote me on that one. Try searching for the resistance, I haven't been able to find it, but it's buried somewhere. Anyways, I hope I helped, make sure to reassemble everything properly, and Good luck

May 17, 2010 | 1992 Nissan 300ZX

1 Answer

I have a 1995 Saturn SL1. It was running on 3

Have you resistance checked the injectors. If the resistance is wrong the pcm will shut the injector drivers down.

Mar 31, 2010 | 1995 Saturn Sl

1 Answer

I have a 97 plym grand voy. 3.3 v6, it has new ignition coil, new spark plug, new crank shaft sensor, new camshaft sensor, but it missfire the cilinder n3 and n6, check the wires from the pcm to the ign....

Not likely. With 3 cylingers out, it would not run. When you have one coil, and spark different at any plug, it has to be wires. Not unusual to have 2 bad wires. Switch with one thought to be good before buying anything. Check the voltage at suspect injector, with test light. Should flicker. If flickers, swap injector with one thought to be good. Buy only parts known to be bad by comparison.

Jan 16, 2010 | 1997 Plymouth Voyager

2 Answers

The car is running on 5 cylinders.I changed the plugs,put in injector cleaner and even changed the lead on the number 6 plug as that appeared to be the problem plug. What next

Unplug the battery cable. Pull out connectors to the injectors, one at a time and measure the impedance on the injector with a digital multimeter. The reading should not be higher than around 10-12 ohms. If you get a really high reading or indication of open circuit then the injector is burn out. If you get really low reading like 1 ohm vice versa, then injector is shorted out. If you found the burnt injector, and replaced it with a good one the car will run a lot smoother since all cylinders are operating.

Aug 10, 2009 | 1983 Ford Fairmont

1 Answer

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leaky intake or bad injector try unplugging injectors while running 1 at a time replace plug while running to find bad injector good injector changes rpm bad one does not witchever one does not change rpm is the bad injector

Jul 15, 2009 | 2002 Pontiac Grand Am

1 Answer


possibly have two plug wires crossed or a bad injector. when running engine unplug 1 injector at a time until you find the one that is not hitting. remember to unplug the iac so engine doesnt rev. when found injector use test lite across wires and run. if light flashes then bad injector. if light stays on or no light then wiring or computer.

Apr 22, 2009 | 1996 Pontiac Grand Am

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