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How to check for a bad injector or bad spray pattern

Chevy silverado

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Injector problem,,,, you can liston to an injector with a stethoscope, or a stick pressed to your ear, you shold hear it clicking. compair it to the others while running, if clicking, it may be partly or mostly clogged. then you need to go to a scope, look for a patern that shows turbulance in the cylinder, if you hove no scope. and injector is clicking, have someone put the car in drive withe parking brake on and a foot on the brake, spray some carberator cleaner in the intake. if it soooths out, your injector is no good, or plugged. if you have the newer style. you cant get to the injectors to liston. the under the upper intake. but you can still spray the carb the same way

Posted on Dec 20, 2008


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I have a 1991 Chevy Suburban 57 liter throttle body injection started running rough couple of days ago yesterday started back firing and Bellowing black smoke out of the tailpipe it stalled a couple of...

Too much gas. Maybe the fuel pressure regulator has failed. Pull off the vacuum hose to the regulator-if any evidence of gas in the vacuum line, regulator is bad-diaphragm has ruptured and letting in extra gas to engine through the vacuum line.
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Remove the top of the intake manifold to access the FI "spider unit"
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Check for a bad ignition fuse, ign module, or computer connections or computer.

Dec 07, 2012 | 1995-1997 Chevy 1500 Truck Ignition...

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1995 chevy silverado 350 TBI V8 standard powerloss

have you checked the filter, i know you state the fuel lines are clear though. likely fuel injectors have lost flow. the TBI injectors can be cleaned, but i usually just replace them. but check them using a timing light hooked to the coil wire for timing of each injector spray. the pattern under the light should be even and conical shape, no major spatter. if one shows low volume, the other one should be replaced at same time, it will save you having to change it when you put brand new next to old one a have same problem again. only replace with brand new, i've had 7 bad remanufactured injectors on one truck at one point in time, only replace with new!

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1993 chevrolet silverado 1500 will not start has new filter and pump can spray fuel in to it will start then dies when it runs out of the fuel sprayed it it

It sounds like your injectors are not firing which could be a crank signal problem or wiring,distributor pickup coil problem or a computer problem.One wire to your injector should be pink this is the power wire it should have around 11.5-12 volts with the key on. The other wire is ground that the computer uses to fire the injector which you can check with a good test light hooked to voltage. and work back from that point if you have neither at the injector.

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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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