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No diagnostics - Check engine light always on since I owned car, just started missing on #4 - no weird noise - It just ain't hittinNo diagnostics - Check engine light always on since I owned car, just started missing on #4 - no weird noise - It just ain't hittin
Did you retrieve a diagnostic code for the problem from the check engine light flashing?Did you retrieve a diagnostic code for the problem from the check engine light flashing?
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Check the gap setting on plugs. Also change the O2 sensor. This is usually the check engine light, or EGR-valve. You could also change it too. Then pull positive battery post off for a minute. THis should reset the computer.
If you have the car computer scanned, which many auto parts stores will do free of charge, you will be able to retrieve a code that can point you in the excact direction of the problem. Without being there myself, the only thing I can say to try that I did not see mentioned is to check the fuel injector on the #4 cylinder. They sell a tool called a noid light, you can disconnect the injector and connect this tool to the wires to see if you are getting an injector pulse. If you are getting a pulse then you may have a bad fuel injector.
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A quick way to check the single coil pack if you know for sure which cylinder is miss firing and its setting a code you can swap the coil pack to another cylinder and see if the miss changes from one cylinder to another. If it travels to where you moved the coil then the coil is bad,if not you have other problems.
check compression ..a difference of 15 lbs compression from cyl to cyl will cause in balance. if ok check crank sensor, supplies signal for coil to fire
please tell me in this tune up you had new spark plugs put in? if check engine light is on there are some stored codes those will give you the suspect cylinder(s) check to see if you have plug wires if not there will be a coil for each cyl. pass. side of motor starting in the front working to the back or firewall cyls are 1,2,3,4 driver side same front to back 5,6,7,8 codes will be PO301 cyl 1. PO302 cyl 2. etc. get the code find the correct cyl. unplug little connector u will need a 7mm socket to remove the bolt holding the coil in place then pull up on the coil and boot.... if u have plug wires get the code find correct cyl and follow plug wire to coil pack in front of engine there will be two one on each side in front of engine...
All saturn engines 91-99 are essentially identical 1.9L 4 cylinder, with the exception of the heads, and the engine mounts on the 91. I had both DOHC and SOHC and they all used the same coil, though there were some minor differences in base mounting. Each coil is attached to two plugs. Suppose there are GM and aftermarket types available.
my money would be on the coil cover, especially if it had been a long time since the last tune up. it is certainly worth trying, as this is part of a routine tune up anyways. good luck!
Did you do a compression test on those two cylinders ? Check spark with spark tester ? of course the advance is going to jump around with a missing engine . Timing issue ,jumped time , engine mechnical problem . Testing an not guessing .
yes it is the ignition coils . po304 is a miss fire on #4 cylinder.wires and plugs should fix the problem unless ignition coil is not firing. there are 2 coils they run 1&4 2 &3 cylinders.
light flashes when comp. picks up a skip pull code and it will be po300 random miss p0301 p0302 p0303 p0304 all are for that # cyl that has the miss best bet change wires and plugs check for oil on wire to plug end in spark plug hole leaking valve cover gasket or spark plug tubes...
No diagnostics - Check engine light always on since I owned car, just started missing on #4 - no weird noise - It just ain't hittin
Did you retrieve a diagnostic code for the problem from the check engine light flashing?
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