I have a 1988 silverado 3/4 ton 2wd 5.7 tbi i have replaced all plugs, plug wires, distributor cap, rotor button , trottle body postion sensor air flow sensor new valve guide seals it starts great idles grat but wen im driving and come up to a light and stopped in gear in will cut out sometimes does it alot more wen in reverse wat can i do to fix this
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Did you test the exhaust back pressure ? 1 to 1/2 pounds are normal readings of the pressure. Could be clogged catalytic converter need an exhaust backpressure test. Valves intermittent valve problem, broken rocker, push rod. Thanks MEGABUCK
put the engine in no 1 compression TDC
there should be a small park in the lip of the distributor body
that indicates no 1 piston plug so point the rotor button facing it when installed
as the rotor turns when putting the distributor in ,it will be necessary to place the rotor button facing a bit to one side of that mark so tat it faces it when installed
the idea is to have the button facing the mark with the distributor plate bolt on he middle of the slot
firing order for 5.7 v8 is 1-8-4-3-6-5-7-2 mostly all of the chevy v8s are the same firing order. the rotor button in distributer turns clockwise, the cylinder numbers are 1-3-5-7 on drivers side, 2-4-6-8 is on passengers side. To get started get your distrutor cap[new one] look on the top you will see a #1that's where you begin you must know if if rotates clockwise or counter clockwise start in that direction then follow the firing order and cylinder line up. good-day!! if cap is not marked, just pull out #1 plug, put a straw or similar in plug hole on top of piston. turn engine over by crank in front of vehicle with a wrench, when the piston comes to the very top just before it starts going down. this is tdc. and rotor button should be pointing to #1 wire on dist, cap. follow from there. good-day !!
In reading your issue at hand not having no spark there is only a few things that can cause this being that its a 1988 car i will list below what you need to go over and check.
1.spark plug wires 2. distributor cap 3. ignition rotor 4. coil pick up 5. faulty distributor
That being said most are a easy and cheap fix plug wires run about 20-35 bucks autozonesduralast brand , distributor cap runs between 7-18 bucks , ignition rotor 3-8 bucks , coil pick up about 15-30 bucks all at autozone.
Now there is no real way to tell if there bad but a good examination of the distributor cap and rotor should tell you corroded inside cracked worn down.
i would start with distributor cap , ignition rotor, coil pick up if the car starts after this replace spark plugs wires. If that does not fix it most likely you distributor is faulty itself.
i hope it helps if so could you leave me so 4 thumbs up feedback thanks so much
the throttle body used to get carboned up where the map senor passage is pull the vacuum hose off map and check vacuum if vacuum is not present remove throttle body nad clean passage
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