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1997 chevy tahoe engine dies when brake applied hard, starts back up. After 6 months must spin motor longer to start. Now cranks and spins well but won't start
5.7 v8 never throws a code. mechanic changed crank sensor and fuel pump. May have needed crank sensor but i dont think fuel pump(too new). Got it started took it to mechanic only after r/ring crank fuse in pass. compartment. truck still dies now needs less brake pressure to die(dies every 4 or 5 firm brakes) Also tahoe had almost no spark before I pulled and replaced fuse.
Re: 1997 chevy tahoe engine dies when brake applied hard,...
Quit throwing money at it..Do a compression test on the cylinders. Anything over 10 years or really high miles, and has running problems. I do this first thing.
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Ihave changed the spark plugs the coil pak and the fuel pump ??????? Before replacing parts did you test the electrical Circuits for the fuel an ignition systems > You don't even know which system the problem is in . Hooking up a fuel pressure gauge an checking pressure and flow , Pulling a plug wire an seeing if there is spark.
And it does crank . a crank no start condition . if the starter didn't spin the engine it would be called a no crank no start problem . Your best bet ,take it to a qualified repair shop . That has the diagnostic tool's and knowledge to diagnose the problem ,an not just replace parts .
047 Engine Hard to Start or No Start Scan Data for Ignition
I'm assuming just by the fact you had a new battery and new starter that sometimes when you turn the key to the start position , nothing happens . Is your vehicle a automatic transmission ? When it doesn't start have checked for battery voltage at the starter solenoid S terminal ? Is there B+ voltage at pins 30 & 86 for the starter relay ? Pin 86 while cranking the engine or trying to crank the engine over . Pin 30 check with key on . Try moving gear selector to neutral . Videos on youtube for basic automotive electrical testing . How to voltage drop test starter motor circuit Find a wiring diagram at www.bbbind.com
Starting System Circuit Description
Voltage is applied at all times to the ignition switch from the IGN A fuse 6 through CKT 242 (RED). When the ignition switch is turned to the START position, voltage is applied to the CRANK fuse 8 through CKT 5 (YEL). From the CRANK fuse 8, voltage is either applied to the clutch pedal position switch (M/T) or the transmission range switch (A/T) through CKT 806 (PPL). When either the clutch is disengaged (M/T) or the transmission is in park or neutral (A/T), voltage is applied to the coil of the starter relay through CKT 1035 (PPL/WHT). Since the starter relay is permanently grounded at ground G105 through CKT 150 (BLK), the starter relay energizes.
Voltage is applied at all times to the starter relay contacts from IGN A fuse 6 through CKT 242 (RED). When the starter relay energizes, the starter relay contacts close, and voltage is applied to the starter motor solenoid. Since the starter motor solenoid is permanently case grounded, the starter motor solenoid will energize two coils. The pull-in winding coil energizes in order to pull the starter motor solenoid contacts closed. When the contacts close, a plunger on the contacts causes the pull-in winding coil circuit to open. The hold-in winding coil then holds the starter motor solenoid contacts closed. Voltage is then applied to the starter motor from the battery through CKT 1 (BLK) and the closed contacts of the starter motor solenoid. Since the starter motor is also permanently case grounded, the starter motor will run until the ignition switch is moved out of the START position. When this happens, a spring in the starter motor solenoid moves the starter motor solenoid contacts and the plunger back to the rest position.
So ,when you turn the key to start does the starter spin the engine ? a crank no start or nothing happens when you turn the key , no crank no start . 5 or 6 battery's in ten months ????? Sound's like you need to take your vehicle to a qualified repair shop.
it sound like its in the coleum . may be your key switch is bad . its something simpull. check your fues inside and out .and see if you can hear your realay working. i hope you can find the prob
not sure of language description ,hard too start or a slow turn over of engine if its slow cranking then drop test battery and a load test on starter motor
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