Question about 1988 Chevrolet S-10

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Truck has good fuel pressure and spark but injectors dont spray. checked voltage and was good ,changed computer still same thing

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If the truck has sat awhile, the injectors have varnished old gas will varnish the injectors cloed,i had one like that had to pull them all out ,soar in a can of injector cleaner from dealer, then blowed with air hose ,replaced the o rongs and put it all back together, cranked on first turn, hope to help you

Posted on Jul 11, 2009


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1997 pontiac sunfire crank no start condition. Have spark, no codes, have injector pulse, good fuel pressure. But it seems that the injectors are not letting fuel into the cylinder.

Did you check the actual voltage reading to fuel injectors? I wondered about a voltage drop? Your fuel pump relay supplies voltage to both fuel pump and fuel injectors.
In the diagram, the gray wire is voltage and the other color is ground controlled by computer. Did you check fuel injectors, individually?I'd want to use a gage and check proper fuel pressure. Fuel--spark--compression--timing. There are other ways to get fuel in the engine besides fuel injectors, Just to see if engine will hit? There are safety issues, safety is your responsibility.
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Fitted cranksensor injector loom still not starting ?

You would put on a new crank sensor because the ignition system won't work, it gives no spark. So now do you have spark at a spark plug wire end? A blue consistent spark? Probably good ignition system, as long as all spark plugs get a spark.

One thing you always want to check with no start is the fuel pressure. Turning the key to on should turn the fuel pump on and put pressure in the fuel rail at the engine. Autozone and maybe others rent or loan fuel pressure gauges. Multi-port injection systems have high pressure specifications, around 40 psi normally. That is what the injectors require to spray out fuel when they pulse and open the nozzles.

With the injector circuit, the first thing to check is if each injector has power to it with the key in ON. One power wire and one ground wire goes to each injector. The power wire is from a fuse that is powered with key on or key in start, and then it is spliced to all of the injectors. The injector grounds all run into the engine computer, where the circuit can be internally grounded for a split second and cause the injector to pulse. But anytime the key is on, the injectors have steady voltage available to them.

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04 400ex has lots of spark cpmpression and fuel timing is correct i dont no wat else to do

Did you check fuel pressure with a gauge? Autozone, some others, rent or loan fuel pressure gauges. If fuel pressure is good, check injector circuit. Each injector has two wires-power and ground. With key on- engine off, each injector should have battery voltage on the power wire (each power wire would be same color to all injectors)-use a test light or voltmeter to check for power.

If injectors have power to them with key on, post back and I can tell you how to check injector ground circuit with a test light. .... well here, you clip the test light lead on the POSITIVE battery post, and stick tester probe into the ground side terminal of injector connector. Now have someone crank the engine over: if ground circuit is good, the test light should be blinking. If both tests work, power and ground circuit, then injector circuit is good and they should be pulsing to spray fuel into the cylinders. Let me know what you find.

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There is an oil pressure switch in parallel with fuel pump relay, if that switch is closed, the fuel pump will run all the time. Click on the link. At the fuel injectors, top wire is voltage, bottom wire is ground. If there is no ground, both wires will have voltage. Make sure battery has a full charge.

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No reset switch. Hook up a fuel pressure gauge an check pressure . Check electrical circuit , voltage drop testing . are the fuel injectors firing ? Anti-theft system light lit ? anti-theft system problems on some vehicles will disable fuel injectors .

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Feb 14, 2018 | 2006 Chrysler Town & Country

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My 2004 Grand am will crank and not start..... it has a new coil pack tried changing control module, checked the fuses, changed the fuel injectors (which are still not working) and fuel is getting to the...

Just because you have fuel present at rail dosent mean its going threw injectors.there is a fuel pump in gas tank.If this pump is not putting out the right amount of pressure the fuel will not pressurise and spray out of injectors.I would do a fuel pressure check and you might find out you need a fuel pump.I would also check for clogged fuel filter.Dont rule out that this could also be an ignition problem.Check for spark.These few things should help you out.Thats why when you bring to dealer they plug car into computer and analize all the things so the dont change anything the dont have to.As a home mechanic you have to go by process of elimination.But somtimes this can get real costly,never mind very aggervating.Keep your cool and keep going,you have come this far but if i were to guess, id say its your fuel pump and filter.Good luck.

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1987 Chevy S10 TBI 4cyl 2.5 L will not run. I changed a weak fuel pump and i am now getting good pressure. I swapped ecm's, changed fuel pressure switch, oil pressure switch, distrib, rotor, electronic...

Check the injector for 12v on one wire. if good check the other wire for a ground witth the key on. The ground wire pulses from the ECM If you dont have 12v from one wire to the other but you have 12v from one wire to battery ground then be sure the ground wire is good to the computer. If you don't have 12 v at any time check for open hot wire or bad fuse. ADD 12v to the hot wire at the injector. DO NOT add to the wrong wire or you will fry the computer

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1 Answer

I installed new fuel pump and truck will idel for about 15 second

check to see if the injectors are working, what engine do you have? and what kind of fuel pressure are you getting? check fuses for the injector circuit, if your fuel pump is working and you know your spark is good, the next thing to check would be the injector system

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