99 yukon 5.7 vortec misfire HELP
- Thread starter lifted_yukon22
- Start date
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ccapehartusarmyINF.(ret)
Full Access Member
looks like carbon fouling to me but i could be wrong
if its carbon foulilng its either caused by rich mix or weak ignition system voltage
how do the other plugs look
if its carbon foulilng its either caused by rich mix or weak ignition system voltage
how do the other plugs look
lifted_yukon22
Member
When I did the compression check on the three cylinders all of them looked the same...
ccapehartusarmyINF.(ret)
Full Access Member
check the resitance
connect one of yer leads to the terminal thats the end were the plug wire attaches to
and put the other lead on the center electrode thats were the spark fires from
it should read almost no resistance
then keep the lead on the terminal and move the other to the ground electrode thats the one that curves over the top you should get an open circuit reading
if any resitance is measured the plugs no good
---------- Post added at 07:41 PM ---------- Previous post was at 07:38 PM ----------
if any resitance is measured that means the spark isnt going accross the gap like its supposed to
connect one of yer leads to the terminal thats the end were the plug wire attaches to
and put the other lead on the center electrode thats were the spark fires from
it should read almost no resistance
then keep the lead on the terminal and move the other to the ground electrode thats the one that curves over the top you should get an open circuit reading
if any resitance is measured the plugs no good
---------- Post added at 07:41 PM ---------- Previous post was at 07:38 PM ----------
if any resitance is measured that means the spark isnt going accross the gap like its supposed to
Almost no resistance?
ccapehartusarmyINF.(ret)
Full Access Member
no resistance is good on the central electrode
now do the ground electrode it should register open circuit
---------- Post added at 03:05 AM ---------- Previous post was at 03:00 AM ----------
if resistance is measured even in the slightest that means the spark is jumping across elsewhere and not across the gap like its supposed to wich would lead to a misfire
now do the ground electrode it should register open circuit
---------- Post added at 03:05 AM ---------- Previous post was at 03:00 AM ----------
if resistance is measured even in the slightest that means the spark is jumping across elsewhere and not across the gap like its supposed to wich would lead to a misfire
ccapehartusarmyINF.(ret)
Full Access Member
lifted_yukon22
Member
I hope I finally find out what's wrong with it....lol I'm about ready to carry the d$@m thing to the scrapyard....
Spider assembly?
ccapehartusarmyINF.(ret)
Full Access Member
i was wondering when you were gonna say something like that
but man i gotta tell youve been good soldier
---------- Post added at 12:37 PM ---------- Previous post was at 12:32 PM ----------
check the ground electrode and the body see if any resitance shows up if it does
somewheres between the coil and the plug yer losing voltage needed for the plug
and if it registers as an open cirecuit then we move on
or as we say in the army "suck it up and drive on"
---------- Post added at 12:38 PM ---------- Previous post was at 12:37 PM ----------
its been so long i cant remember did you say you already replaced the coil
