Question about 1999 Chevrolet Silverado 1500

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If the injector spider was bad could it cause me to lose compression in a cylinder sorry 98'305c.i vortec

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An injector sprays fuel into the cylinder,that's all

You loose compression,your taking the motor apart

Posted on Mar 18, 2011

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Posted on Jan 02, 2017

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I have a 2000 chevy astro van with misfire code in cylinder 6. I was told that i have to replace the spider, fuel injectors. Could it be something else?


If, in fact, #6 fuel injector is faulty, you need only replace THAT one injector. If once you've replaced said injector and another check still shows #6 is misfiring, same code, then you have a faulty exhaust valve and are losing compression. Best to do a compression test on all cylinders with all spark plugs out before changing that injector. It could be good yet and you'd have changed it for naught. Compression test first, it's simple. I'f test shows low compression on #6 then the valve is bad and you'll have to pull the head off and d a valve job to re-seat the valve. Once re-seated, turn the face of the head gasket surface up flat and pour some alcohol into the head combustion chamber. If it doesn't leak out, your done. Put it back together.

Jul 13, 2017 | Cars & Trucks

2 Answers

I have a 01 chevy blazer with a 4.3 vortec engine I want to no if a faulty fuel injector spider would cause low fuel pressure


low fuel pressure is from
bad pump,
blocked filter,
faulty pressure regulator
evap system not venting tank properly
leaking injector seals

Feb 13, 2017 | Cars & Trucks

1 Answer

Why is there a cylinder 2 misfire?


Check these three things in the misfiring cylinder: spark, gas, and compression. One of them is wrong or missing. For spark check the spark plug and wire. Make sure you have spark on the plug wire, a strong blue spark. For gas, the fuel/air mixture may be wrong. Does the fuel injector pulse, putting gas into the cylinder? Possibly you may have a leaking injector or a clogged injector.

If gas and spark seem okay, you need to check compression in the cylinder. Low compression will cause a misfire. If compression is 20 or 25% lower than adjacent cylinders, that could be causing a misfire. For example, say numbers 1 and 3 cylinders had about 150 psi compression. 80% of 150 = 120, so if cylinder 2 is 120psi or less, that could be setting the misfire code. Low compression can be caused by valves not seating well, or bad piston rings, bad head gasket- something in the combustion area of the cylinder is losing compression.

Aug 17, 2015 | 2006 Mazda Tribute

1 Answer

Does a 1996 chevy s10 pickup 4.3 vortec have a saftey cut off that will stop the fuel from getting into the spider injectors


Sorry there is no safety valve or switch. Only Ford products use an inertia switch.
Have you checked for power and ground at the injector connector ?

Jun 22, 2015 | Cars & Trucks

1 Answer

My 97 Chevy 5.7 vortec is missing on cylinders 3, 4, and 5, changed distributor cap and truck ran great for about two hours. Changed fuel filter and there was no change. New plugs and wires summer of 2012....


Well its not exactly ignition or fuel injectors, since cylinder 6 in in the firing order. 1-8-4-3-6-5-7-2
Could be something with the intake again, or the pickup in the distributor. I suppose if you have the multi-port injection inside the plenium it could be some of the spider valves or lines.
You would need to know if those cylinders are firing, and if they have normal compression.

Mar 01, 2013 | Cars & Trucks

1 Answer

Why is my 2004 GMC Yukon still missing after I have changed the wires and spark plug


any check engine light on? if this is a vortec engine it may have a bad fuel injection(spider) on it. also if the engine has been degreesed the electrical board will get wet causing the miss thru the injectors. this is located at the big plug behind the throttle plate(if wet try blowing compressed air in the harness). hope this helps

Aug 30, 2012 | Cars & Trucks

3 Answers

Know if my 95 chevy blazer has a spider CPI?


A spider injector is located underneath the intake plenum and this is multi-port. Otherwise you have a throttle body injector system. Vortec engines have spider injectors and they are super expensive to replace ($400.00- 850.00) each ! There is only one spider injector for each engine it has 6 legs/fuel tubes that go to each cylinder.

Oct 10, 2009 | 1995 Chevrolet Blazer

2 Answers

I have a 1995 gmc jimmy 4x4 i check fuel pressure an the voltage


a simple 12vdc will not due, it needs a pulse signal from the computer. a full 12vdc could fry the injectors, but the spider assemblys in them v6's are always a @$!$@ up design. i have encountered alot of them with bad pcm, or the spider.

Sep 15, 2009 | 1995 GMC Jimmy

1 Answer

What are spider injectors and how much are they


The term "spider injectors" stems from the Vortec Series Engine's fuel injection system. Unlike fuel injectors that are installed individually commonly used in engines, this one piece molded plastic web body which all 6 or 8 injectors are permantly attached(94-96), when looked at resembles a look of a spider. est. cost $350-$450. In 97 on up, GM changed from the fixed injector (If one injector goes bad you need to change the whole or all injectors) to being able to individually change each injector. est cost $50-$150 ea.

Jul 01, 2009 | 1997 Chevrolet Tahoe

2 Answers

How to manually get a trouble code out of a 95 blazer with vortec


The vortec motor has been known for the so caller spider assembly which is the fuel injection set up inside the intake manifold going bad.The regulator starts leaking wich puts extra fuel into the motor.If that is it you should change the whole assembly.

Nov 30, 2008 | 1995 Chevrolet Blazer

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