Initial diagnostics showed misfiring. Replaced plugs, wires, rotor, distributor cap and coil. Had to replace injector for cyllinder #8 which fixed the misfiring, but still running really rough. Mechanics are baffled!! Any ideas? Runs roughest between 1500 & 2000 RPMs.
97 chevy 1500 4x4 replaces plugs wires cap rotor dist pick up and crank sensor truck run good when cold as soon it heats up and comes to stop it feels like it boggs down runs rough and stalls any idea what to do?
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Re: 1997 chevy truck running rough
Does this vehicle have hydraulic tappets if it does ???then has it had regular oil changes if not and it has hydraulics tappets then they could be gummed up and the gaps on the valves are too tight causing the rough running.was this vehicle designed to run on unleaded petrol ??and if so has it got stelite coated valves and seats to run on unleaded fuel,Do a compression test and see if its within spec as this sounds like a valve problem to me.
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misfires are from mechanical faults ( loose valve seat insert, problem hydraulic tappets 0 injectors -- wiring,injector tips , low fuel pressure ECM to electronic problems , plug, HT lead distributor cap (if no multi coils) rotor button, coils and ignition control module
run the fault codes to get closer to the fault
I WOULD REPLACE DISTRIBUTOR CAP AND ROTOR.MARK LOCATION OF ROTOR OR MAKE NOTE SO YOU CAN INSTALL NEW ROTOR IN CORRECT FIRING POSITION. IF THIS CAR HAS A LOT OF MILES I WOULD REPLACE DISTRIBUTOR CAP, ROTOR.SPARK PLUGS AND WIRES.REPLACE IGNITION COIL.CLEAN FUEL INJECTORS, FILL GAS TANK UP TO 3/4 TO FULL TANK OF GAS POUR CAN SEAFOAM IN FUEL TANK IT WILL FLUSH OUT THE FUEL INJECTORS WHILE ENGINE RUNNING OR DRIVING CAR. REPLACE FUEL FILTER. REASON I SAY DO A TUNE UP PROBLEM COULD BE MINOR FIX.COULD NEED TUNE UP.IF TUNE UP DONT HELP THEN YOUR PROBLEM IS DISTRIBUTOR OR THE CAMSHAFT SENSOR INSIDE OF DISTRIBUTOR.THAT WOULD SET OFF CHECK ENGINE LIGHT.BUT I WOULD SAY TUNE UP COULD FIX PROBLEM.
There is no cap and rotor, as the vehicles igntion system is DIS (digital ignition system). The recommended tune-up on these motors require sparkplug and coil replacement. The coil type in this vehicle is COPs (coil over plugs). Usually moist and oxidation develope on the sparkplug chamber walls from faulty or worn coil boots. This causes the coil to short, they must be replaced at 75,000 miles at the same time the sparkplugs are replaced. Typical symtoms are: Vehicle stalls (restarts and runs normal), intermitted jerks/sputter while driving, misfires, rough idle, severe power loss. Hopefully this helps
P-0304 indicates number 4 cylinder misfire. Are you using Toyota parts dept spark plugs? More often than not, non-toyota plugs make the v-6s run poor, right out of the box....
Try this:With the engine running, pull the connector wire off of the #4 injector. Note to see if there is any change with the idle quality. No change? You may have a bad injector.