Question about 1997 GMC Sierra

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1997 sierra 5,7 misfire cyl#5 i changed wires,spark plugs,rotor and cap,compression 170psi.please HELP

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MAY BE YOU NEED TO RESET ONLY BUT IFIT MISSES CHECK THE INJECTOR O RING SPRAY SOME STARTING FLUID IN THE INJECTOR PLACE IF OR JUST TWIST IT YOU WILL KNOW IF IT IS A VACCUM LEAK RIGHT AWAY SOME TIMES YOU HAVE TO PICK THE CONNECTOR TO MAKE GOOD CONTACT EVEN CHANGE THE INJECTOR TO ANOTER PLACE IT WILL MISS IN THE NEW POSITION IF IS BAD

Posted on Mar 23, 2011

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Misfire cyl 5 have replaced plugs, plugwires, cap and rotor with top of the line to cheap parts only only does this when it rains or snows?


check for a problem in the injector wiring for that cylinder
check for corrosion in the connections
replace that injector control
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Do a compression test of the engine. See if your valves are seating properly is what you'd be looking for in checking for low compression. It could be causing the miss. When you changed plugs, did any one plug stand out as being different in color or texture at its base? The constant miss might put black sooty deposits on the spark plug. Course you'd have to remember which cylinder that plug came from to help you locate the miss. I'm assuming you have throttle body injection?

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REPLACE DISTRIBUTOR CAP AND ROTOR REPLACE SPARK PLUGS AND WIRES IF NOT BEEN CHANGED IN LONG PERIOD OF TIME.CHECK IGNITION TIMING.CHANGE AIR FILTER CLEAN FUEL INJECTORS.IF ENGINE STILL MISFIRE IGNITION COIL IS WEAK OR YOU HAVE LOW CYLINDER COMPRESSION.

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1997 Dodge Stratus, 2.5L 4 cyl engine. Engine diagnosis from a trouble reader = cylinder 3 misfiring. The plug and spark plug wire are good. I don't know how too test the electronic ignition or the fuel...


Test the compression in that cylinder. Make sure you have the correct plugs, and good wires, as well as the cap and rotor button. If you have good compression, and the plugs and all are good, I would suspect either a bad fuel injector, bad head, or a bad distributor.

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#6 cylinder misfire


Could be a valve seat burnt, check compression, if lower than the rest, probably that or a head gasket leak next to #6.
Borrow or buy a compression tester or get a garage to test for you.
To fix you will have to determain wether the valve can be ground back in or a new seat is required, but either way, as it's a big job, get all the valves done as if one has gone, how long before more go?

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Hi, I have a 1997 Porsche 993. Motronic 5.2 M07. I am getting these fault codes 1) 62 misfire emissions-relvant 2) 51 Cylinder 2 misfire emissions-relevant) 3) 54 Cylinder 5 misfire ...


misfire :-------- try checking your 02 sensors /fuel pump and filter.

for 51 cylinder misfire :---
Change the coil. Period. Very easy to remove from the vehicle if it's a 4 cyl. Follow that spark plug wire from the spark plug to the other end. What it's attached to you should replace
for 54 cylinder 5 misfire :---First you have to eliminate the most obvious problems, like spark plug and spark plug wire. If you replace those and you still have a misfire, then it's a good idea to look for a vacuum leak in the intake manifold

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Plugs need to be changed every 30K, and wires, cap, rotor every 60K. Could be a weak coil not putting out enough spark, could be the pickup in the distributor, could be timing is off from stretched timing chain, could be weak compression. Check the basics first.

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