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mechanic
User
Aug 29, 2012, 8:50 PM
Post #1 of 15
(1360 views)
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02 chevy pickup 5.3l misses on cyl 1 3 5 7 replaced spark plugs wires coils injectors swichted bank per bank good compression 150 what could it be
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mechanic
User
Aug 29, 2012, 10:21 PM
Post #2 of 15
(1308 views)
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Re: 02 hevy pickup
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Just thinking could it be possible left drivers side cat plugged
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mechanic
User
Aug 29, 2012, 10:31 PM
Post #3 of 15
(1298 views)
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Re: 02 hevy pickup
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Oh yes new camshaft
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mechanic
User
Aug 30, 2012, 5:43 AM
Post #5 of 15
(1282 views)
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Re: 02 hevy pickup
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How do u do that
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 30, 2012, 5:47 AM
Post #6 of 15
(1278 views)
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Re: 02 hevy pickup
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I saw you giving advice to other people. Aren't you a tech?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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mechanic
User
Aug 30, 2012, 10:52 AM
Post #7 of 15
(1264 views)
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Re: 02 hevy pickup
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Ummm yeah but i heard of the vacuum gauge but didnt no about that need advice how to determine restriction in exhaust thanks
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mechanic
User
Aug 30, 2012, 10:55 AM
Post #8 of 15
(1263 views)
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Re: 02 hevy pickup
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Oh and some other shop put a camshaft in it but still missing on that bank
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 30, 2012, 11:19 AM
Post #9 of 15
(1261 views)
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Re: 02 hevy pickup
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Well. Then get yourself a vacuum gauge or better yet get a pistol type that both reads vacuum and you can pump it by hand to check vacuum operated devices on things. How could you live without one and fix anything?
Find actual intake manifold vacuum source - primal for knowing what's up or what adjustment will be made under what conditions of it. Put gauge on a "T" so whatever device that line goes to still gets the info.
If all was right you would read about 18 +/- (in Hg) of vacuum just idling and see spikes over 20 if just snap revved up. Now just look at idle vacuum and raise idle without load to 2,000 or a bit more and both should be dang near the same. If it plummets at the raised idle that's highly indicative of an exhaust restriction but doesn't tell you what just that engine isn't getting a free and clear path to exhaust itself. Without a bent up exhaust system or all messed up in some other way the converter(s) are subject to plugging up and you can go on to verify that in other assorted tests.
In that it's misfiring results are going to be funky and a bouncing needle or reading but telling of what the engine is seeing and making adjustments by that on a 2002 model anything,
T
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mechanic
User
Aug 30, 2012, 6:00 PM
Post #10 of 15
(1249 views)
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Re: 02 hevy pickup
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I do have a pistol grip vacuum pump and i use it quite bit but checking for restrictions heard about it but never did it that way but did the test results at idle 17 in but did have its spikes on the gauge at 1000 rpms but anyways tapped on the cat all broke up inside then found out the customer was putting E85 in it replacing cats
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 30, 2012, 6:07 PM
Post #11 of 15
(1244 views)
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Re: 02 hevy pickup
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It might be the 5.3L Z engine. Which has a flex fuel system.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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mechanic
User
Aug 30, 2012, 6:09 PM
Post #12 of 15
(1239 views)
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Re: 02 hevy pickup
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It dont called gm with vin
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mechanic
User
Aug 30, 2012, 6:14 PM
Post #13 of 15
(1237 views)
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Re: 02 hevy pickup
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Ill replace cats take fuel out let u know
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 30, 2012, 6:17 PM
Post #14 of 15
(1235 views)
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Re: 02 hevy pickup
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Exhaust restriction or hung O2 sensor would have been the first thing to check if you have just one bank misfiring. I'm surprised camshaft, injectors, coils, etc. were replaced.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Aug 30, 2012, 6:19 PM)
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mechanic
User
Aug 30, 2012, 6:50 PM
Post #15 of 15
(1224 views)
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Re: 02 hevy pickup
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I know but from the customer not telling me all about whats been done to it fromshop to shop end up to me made it difficult but im learning
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