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How do I test my 1993 4.9 Cadillac fuel injectors

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There are a few things that can be tested on the fuel injectors, 1st you need to unplug each injector and test the resistance on each injector, you do this with a DVOM the resistance across the the injector windings should be 8.0-25.0 ohms, if the injectors ohm out ok then remove the fuel rail with all the injectors attached and set all the injectors in a catch container ( baby food jars work real well for this ) and crank the engine and make sure each injector is spraying a good clean patten with no dipping. replace any injector that is out of range on ohms and any that do not have a good clean spray pattern.

Posted on May 19, 2011

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SOURCE: 1993 geo tracker fuel injector

ecm does control but is also based on input from the Throttle position senser. unplug the TPS and try again. Also make sure the ECM and engine grounds are good

Posted on Feb 21, 2010

gordanddar
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SOURCE: how do i install fuel injectors on a 1993

Your problem doesn't make sense to me , but I can almost guarantee you that replacing your injectors won't cure it. I am sitting here trying to figure out how fuel could be getting into your oil and not coming up with an answer. A blown intake manifold gasket , or head gasket would do it , but would cause other very noticeable problems

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check the fuel pump and filter. if thet are okay..then the ECM is shot and needs replaced.

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Hi I am working on my 1993 cadillac seville sls 4.9l engine. It will not start


Wow... Thats a lot of parts replacement for what may be a simple problem. The vehicle needs fuel and spark to start ( along with air and compression ).Is there spark from one or more spark plug wires when one is disconnected and held over a grounding point while the engine is cranked over? Is there fuel supply? Pressure to the fuel rail tested? Check the basics before you invest tons of money in an older vehicle

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How do i check the fuel injectors


There are multiple ways to test fuel injectors. The quickest is with an ohm meter, but it's less accurate than using more sophisticated equipment. With an ohm meter connected to the terminals of the injector itself, the meter should read about 14 ohms. Also, you'll need a test light to check the circuits going to them. With a test light connected to ground, disconnect all fuel injectors and crank the engine. One terminal at each injector connector should turn the light on. With the test light connected to the positive battery terminal, crank the engine again and check to see that there is a flashing light at the opposite terminal.
What sort of problem are you having that you want to test the injectors?

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MOST LIKELY YOU HAVE A injector leaking allowing fuel to leak into a cylinder. check this by installing fuel pressure gauge and see if it leaks down. if so will need to pull injector rail and watch to see which ones are dripping

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1993 deville 4.9 missing at idle and intermittant missing at speed. Has new wiring harness new plugs, new ignition coil etc


CHANGE FUEL FILTER AND CLEAN FUEL INJECTORS,CLOGGED FUEL INJECTORS WILL CAUSE ENGINE TO MISS, MAKE SURE SPARK PLUG GAP IS 0.060, LEAN MISFIRE FROM WEAK FUEL PUMP,CHECK FUEL PRESSURE SHOULD BE 40 - 50 PSI. IF EVEVY THING CHECK OUT OKAY,MISSING PROBLEM COULD BE LOW CYLINDER COMPRESSION OR INTAKE MANIFOLD AIR LEAKS.DO A COMPRESSION TEST IF NECESSARY.

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1993 cadillac deville when i start it it dies unless i push the gas its not fuel pump or filter i just replaced them


It could be the throttle position sensor, mass air flow or map sensor, weak fuel injector, bad spark plugs, or a number of other issues. If the check engine light is on, getting it pulled may further direct you. Goodluck.

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My 1993 cadi deville keeps flooding. gas fills-up in carbator when I turn key on. What's this?


first, the 1993 cadillac deville should have a throttle body not a carburetor. And, I think it has ported fuel injection to each cylinder with a fuel injector for each cylinder if it's like my 1990 Cadillac Deville.

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1993 cadillac seville won't start. has 195,000 was running fine up until yesterday, has over a half a tank of gas in it and there are no gas leaks , smoke or smells; display doesn't record anytthing...


do a spark and fule pressure test, and an injector signal test, you need a spark tester, fuel pressure guage and a noid light,cant tell you more until these results are in

May 04, 2010 | 1993 Cadillac Seville

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1996 cadillac deville want start


If you had a strong stream of gas shooting out then you may have an fuel injector problem. Possibly a clogged injector or bad injector.If the stream of gas was weak replace fuel filter first and test again.If problem persists check pump fuse then replace pump. sorry for miss reading your post.

Aug 25, 2008 | 1996 Cadillac DeVille

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