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1990 5.7 350 chevy RWD C1500
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Jonathan Gibson
Novice
Dec 12, 2013, 5:53 PM
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1990 5.7 350 chevy RWD C1500
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I NEED HELP!!! My truck has a shake.. it runs smooth till you put it in drive. once you take off it shakes and acts like its choked out or restrained. and when you get in it hard it acts like it can't pick up or get the air or fuel it need and then shifts hard along with the hard shake... I have grate fuel pressure oil pressure and not over heating.. I've replaced the fuel filter under the frame rail new fuel injections and filters new plugs plug wires set timing new distributor cap new throttle positioning sensor the trans has been rebuilt new torque converter and all new fluids.. I'm at a lose here its driving me nuts I NEED HELP before I go broke and crazy
(This post was edited by Jonathan Gibson on Dec 12, 2013, 5:59 PM)
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Discretesignals
Ultimate Carjunky
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Dec 12, 2013, 6:08 PM
Post #2 of 12
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Re: 1990 5.7 350 chevy RWD C1500
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How many miles on this engine? You should first perform a compression check. Make sure the battery if fully charged, the distributor connector is unplugged, and you have the throttle wide open when you do your compression check. Write down your numbers and post them in here.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Discretesignals
Ultimate Carjunky
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Dec 12, 2013, 6:16 PM
Post #4 of 12
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Re: 1990 5.7 350 chevy RWD C1500
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So you tested the compression already? What numbers did you get?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Jonathan Gibson
Novice
Dec 12, 2013, 6:20 PM
Post #5 of 12
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Re: 1990 5.7 350 chevy RWD C1500
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not sure on the numbers but the man I had look at it said compression and fuel pressure was vary good that it could be my throttle position sensor took it home and replaced it and same stuff
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Discretesignals
Ultimate Carjunky
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Dec 12, 2013, 6:27 PM
Post #6 of 12
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Re: 1990 5.7 350 chevy RWD C1500
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Just wondering because if you have compression problems, that will affect everything else. The fuel injection system on that engine relies on engine vacuum to calculate injection and ignition timing. If you have low or erratic manifold vacuum because of engine mechanical problems, you be chasing ghosts replacing sensors.
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 Dec 12, 2013, 6:29 PM)
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Jonathan Gibson
Novice
Dec 12, 2013, 6:35 PM
Post #7 of 12
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Re: 1990 5.7 350 chevy RWD C1500
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if its a vacuum line wouldn't it cause the truck to rev faster or almost die??
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Discretesignals
Ultimate Carjunky
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Dec 12, 2013, 6:39 PM
Post #8 of 12
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Re: 1990 5.7 350 chevy RWD C1500
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A vacuum leak will probably cause high idle, but shouldn't cause it to die or bog on acceleration.
If you are sure you have good fuel pressure/volume and the engine is mechanically sound, testing for excessive back pressure would be something to check out. Does this have headers/dual exhaust or is it on manifold and Y pipe?
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 Dec 12, 2013, 6:42 PM)
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Jonathan Gibson
Novice
Dec 12, 2013, 6:46 PM
Post #9 of 12
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Re: 1990 5.7 350 chevy RWD C1500
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yes I have a set of custom hooker headers that go into an x pipe then into to 44 flow masters that dump half bed
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Discretesignals
Ultimate Carjunky
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Dec 12, 2013, 6:50 PM
Post #10 of 12
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Re: 1990 5.7 350 chevy RWD C1500
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Cats are gone? Are there any other mods on this engine?
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 Dec 12, 2013, 6:50 PM)
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Jonathan Gibson
Novice
Dec 12, 2013, 6:58 PM
Post #11 of 12
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Re: 1990 5.7 350 chevy RWD C1500
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high rise intake new rods valves rockers springs 292 thumper comp cam iron eagle crank and punched 30 over with a performance throttle body and 40 lb injectors I've done all of this last year and the truck ran like a sewing machine till three days ago
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Discretesignals
Ultimate Carjunky
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Dec 12, 2013, 7:07 PM
Post #12 of 12
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Re: 1990 5.7 350 chevy RWD C1500
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Could be a misfire causing your issue if it is shaking and lacks power. If you brake torque the engine, can you duplicate the misfire/shaking? With the big cam it is kind of hard to pick out misfires at idle. You could do a power balance test by disabling spark for each cylinder one at a time while the shaking is going on. The cylinder that doesn't make a difference is the one that is missing.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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