Question about 1991 Chevrolet S-10

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No voltage at tbi units

Fuel flowing into throttle body but not spraying. Spark at plugs. Injector pins ohm, I assume they are normally closed which makes sense.

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  • Chevrolet Master
  • 1,209 Answers

Your injector fires off of the pick-up in the distributor.

Posted on Nov 29, 2013

Testimonial: "Ok...I used a multimeter to measure voltage when turning the engine over. Never had any voltage reading at all. All fuses are good. Thought it could be ecm fuse as I have had that experience before. How do I check the pick-up in dist?"

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Posted on Jan 02, 2017

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SOURCE: 85 s-10 2.5l no fuel from the injectors

electronic engine control unit calculates the mass of fuel to inject, not how wide it sprays. It's the type of solenoid that you use. Some have wider spray nzzles than others. An external Fuel pump helps the delivery of the fuel. Also since fuel injectors rely on mass air flows nowadays, you have to have proper mixture coming through. hows your Fuel pressure regulator?

The throttle position sensor reports to the computer the position of the throttle butterfly valve, which the ECM uses to calculate the load upon the engine-but inorder for this to run, you may need an external pump.

Sounds like nothing is being grounded back to the ECM to even give a reading. If your regulator is improper and you do not have a external pump (depending on your model), than check those. If not, Start from scratch.

If you ever lose your way, go back to the beginning_REWIRE!

Goodluck.

Posted on Feb 16, 2009

  • 1 Answer

SOURCE: 82 corvette crossfire injection, engine

Please go to the crossfire injection forum to get some straight answers to the 82 corvette CFI system and how to troubleshoot it properly. There's a lot of misinformation given here, so much so, I don't know where to begin.

One thing is, the 82 corvette CFI does NOT have a MassAir Flow sensor system, it uses MAP and O2 mostly. The CTS sends a signal to the ECM telling it what the temp of the motor is and in turn the ECM controls the amount of fuel being dumped. On the older (orignal) CTS sensors, they have one wire and takes its ground from the threads. If any coorosion takes place, usually the CTS will report a cold engine and request lots of fuel.

To repair this issue, install one of the newer style CTS sensors that have two wires, one for signal and the other is ground.

Fuel pressure and vacuum leaks on any CFI motor play key roles. Set the FP to 14-15psi measured inbetween the TBs. The regulator is located on the rear TB and must be slightly moded to make it adjustable and can be done in a few minutes.

Posted on Mar 07, 2009

SOURCE: 1987 Chevy S10 TBI 4cyl 2.5 L will not run. I

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

Posted on Jul 15, 2009

  • 4088 Answers

SOURCE: 1987 chevy s10 2.5l tbi will not start. changed

That eliminates the crankshaft and camshaft position sensors. Have you checked the fuel injector itself for an open winding or stuck valve plunger? There should not be a steady 12 volts to the injector--if good injector, it would be spraying fuel steadily into the throttle body. But at least the engine should try to run if poorly. Take the injector out, dry it off with air, and intermittently apply 12 volts to one terminal while grounding the other. You should hear a click from inside every time you touch 12 volts. If not, replace it. If it does, it may be plugged with debris. Try blowing through it in reverse with compressed air.

Posted on Jul 17, 2009

  • 3 Answers

SOURCE: 1989 Cavalier Z24 Stalling problem

Have you heard of Noid lights? You unplug the fuel injector and plug these in and they will light up if the injector is getting power. This might give you a better hint. There are also lights that go inbetween the spark plug and wire. Between these two items you may be able to narrow down the problem to a specific system. I believe that your car has a coil pack. Some of these engines have problems with the crank trigger. I believe it is located on the back side of the motor. If you decide to change it, be careful. I have heard of them breaking into two pieces and becoming a big problem.

Posted on Jul 21, 2009

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I have a saab 93 2.0t i have replaced all the vacuum lines an the turbo the pcv valve when u drive the car it sputters an feels like its not gettin enough fuel an stalls when the turbo builds boost it pops...


Hello.
My suspicion on your problem is a plugged exhaust or slipped crankshaft to camshaft timing.
I'd bet on the exhaust though.
It appears your turbo is doing it's job as it is able to blow off the intake duct.
But if all that pressure can't get out the other end it's bound to do that.
Drill and tap a small fitting into the exhaust pipe behind the exhaust manifold and install a pressure gauge there. Should not be over 1 PSI at idle and not over 2 on throttle blips.
Hope this solves your problem.
If you need more help with this, ask me.

KL

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1998 350 Silverado will not start


I believe that you have throttle body injection (TBI) Take off the air cleaner and have someone crank the engine look at the injectors and see if fuel is seen..Do you or have you smelled fuel when you were recently attempting to start truck???? if so this sounds like you are not getting spark....if you havent smelled fuel try priming TBI with gas and see if the truck fires...If so you know that problem lies in fuel delivery... On TBI systems it is very important that a conicle spray pattern is delivered by injectors for proper ignition if injector drips fuel into TBI this could cause a no start condition...To see if spray pattern is correct you can use a timing light if available...Hook it up as normal (red positive post and black negative post and pick-up on #1 spark plug wire) point light at injector and have assistant crank engine light allows visibility to spray pattern.....also check the fuel pressure regulator and vacuum lines....Hope this helped you..let me know if I can help anyfurther....Good Luck!!!!

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1 Answer

Fuel Injector Wont Spray


check wires at throttle body. can use a 12 volt test light to check for current. if you have spark it is not the ign module. set meter for 12-20volts. should have 2 fuse boxes on this model, one behind right side of dash at floorboard

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