I need shome where spark - 1994 GMC Safari

usually the relay positions are printed on the lid or molded into the lid if not google them

how do you know its no spark..

easy job replace one spark plug at a time.you need buy new set of spark plug wires and spark plugs.reason need new wires possible old ones will break from inside plug boot when you remove plug wires.you need basic 3/8 ratchet wrench.you need long short extensions.need spark plug socket.need spark plug gap gauge.need a universal joint connect to the extensions to reach sharp angles.make sure engine cold when replacing spark plugs could damage heads.use a 12 inch piece vacuum hose to help aid in installing sparks in hard reach spaces with out damaging crosss threading plugs threads and cylinder head threads to plug.

well replace spark plugs is not a hard job,when replacing spark plugs, good time to replace plug wires also.you need to replace one spark plug at a time so you wont mix up firing order. you need a spark socket, torque wrench, 3/8 ratchet wrench, 3/8 short and long extensions,you need a spark plug gap gauge.spark plug gap for 2.0 engine 0.051 the 3.0 engine spark plug gap is 0.052 - 0.056. just follow spark plug wires they will lead you to the spark plugs.warning wait until engine cool down first because removing spark plugs from hot engine could damaged the aluminum heads,use compressed to blow away debris before removing spark plugs keep debris falling into the cylinders.wear safety glasses if you use compress air and use small amount anti seize compound to the spark plug threads.good idea slip a short length rubber hose over the end of spark plug to use as a tool thread it into place.reason i use piece vacuum hose it will grip the spark plug enough to turn it, but will start to slip if the plug begin to cross thread.when installing spark plug, it should turn at least few times if spark plug start tighten before 1/4 turn thread cross threading need to back off start over dont keep turning you will stripped spark plugs threads in the head also damage spark plug threads, so be careful, good luck with job.

CHANGE SPARK PLUGS.YOU NEED SPARK PLUG 3/8 SOCKET.YOU NEED SHORT AND LONG 3/8 EXTENSIONS.YOU NEED SPARK PLUG BOOT PULLER AND A SPARK PLUG GAUGE SET THE SPARK PLUG GAP.NOW CHANGE 1 SPARK PLUG AT A TIME SO YOU MIX THEM UP GET FIRING ORDER MIX UP CAR BACK FIRE WONT CRANK.ALSO CHANGE PLUG WIRES ALSO.

Remove the rubber boot carefully. Might want to grab ahold of the boot and turn in back and forth to break it free abit then pull the boot off. 5/8 deep socket with the spark plug insert will help keep the plug in the socket as you pull it out.

-david

CHANGING SPARK PLUGS EASY.ALL YOU NEED IS SPARK PLUG SOCKET.TORQUE WRENCH WOULD BE GOOD.NOT MANDATORY IF YOU MAKE SURE NOT TO OVER TIGHTEN SPARK PLUGS STRIP OUT THREAD SINCE THEY ARE ALUMINUM.YOU NEED A 3/8 RATCHET.SHORT AND LONG EXTENSION.YOU NEED SPARK PLUG GAUGE TO SET SPARK GAP.THE 2.0 OR 2.3 ENGINE SPARK PLUG GAP IS 0.041- 0.045.

you will need
8mm
10mm
5/8 spark plug socket
3/8 ratchet
3/8 extension (it could be 4in and longer)
and spark plugs factory plugs are pregap iridium
spark plug torque is 13.0 lb.ft
coil torque 8.7 lbf.ft
spark plug part # NGK 1zfr5k-11
# DENSO pkj16dr-m11
and spark plug anti seize on spark plug thread
what you need to do is remove the plastic cover 8mm socket or 10mm sockets
now remove the spark plug covers and remove the spark plug coils too 10mm head bolt you will need a 5/8 spark plug socket and a 3/8 ratchet and a 3/8's extension too
you need OEM spark plugs they work the best
hope this will help

not to bad you'll need long extension, front one are there in view, the back one's remove spark plug boot (long one) and with extension you can reach spark plug's.

FIRST OF ALL YOU HAVE CHANGE SPARK PLUGS WHEN ENGINE IS COOL.IF YOU CHANGE THEM WHILE ENGINE IS HOT YOU COULD DAMAGE THE ALUMINUM HEADS OR CAUSE DISTORTION.TO CHANGE SPARK PLUGS YOU NEED A SPARK PLUG SOCKET.A TORQUE WRENCH.ITS NOT MANDATORY.BUT IT WILL KEEP YOU FROM OVER TIGHTEN SPARK PLUGS.YOU NEED A 3/8 RATCHET AND EXTENSION.YOU ALSO NEED A SPARK PLUG GAP GAUGE.AND SPARK PLUG BOOT PULLER.YOU ALSO NEED SOME ANTI SEIZE COMPOUND.TO PREVENT DAMAGE THREADS WHEN INSTALLING THE SPARK PLUGS.