02WS6Bird

iTrader: (2)

Ok so my car appears ot be missfiring down low, under 1500 RPM's typically not as bad as before its pretty minor. When driving it gives little/no problem,, and its no longer counting misses. but the motor and car are shaking more than usual especially if i let off the gas around Lock-up (auto) How can i test the coil packs nd find which one(s) is/are messed up? i have a 2002

02WS6Bird

iTrader: (2)

buddy of mine said that happened to a vette @ his local shop he had no idea how to check it they left it car ran fine just idled kinda bad. Let me know fellas if ya can i really need this!

SHINER

iTrader: (18)

sounds like bad plugs/wire/coil pack something simple like that....IF not that than a def. sign of a vacuum leak

camaroextra

iTrader: (10)

hmm. im assuming you checked the plugs. check the motor mounts, thats just a hunch

02WS6Bird

iTrader: (2)

brand new plugs and wires, will double check motor mounts but the miss can be heard and felt

akZ28

Have you gotten an SES light yet?

02WS6Bird

iTrader: (2)

What would be a vaccuum to check though? i havent pulled anything off this car so it wouldnt be the intake manifold or anything

camaroextra

iTrader: (10)

Have you checked them since you have put them in?

im assuming this problem didnt exist before the new plugs, how long afterwards did it start?


Well keep us updated, im curious to know what it is

02WS6Bird

iTrader: (2)

No SES Light, the computer isnt reading any missesand if it shows any it shows between 2 and 6 randomly and then it goes to 0 anyway on most of the cylinders from waht i saw- its not reading misses its like normal but you can see that it is missing. It's not nearly as bad as the day before but its still there. Especially on Deccel when in lock-up. after hard driving (which feels fine still barks the tires in all gears) then you progressively stop at a light and the idle will struggle a little and go back to normal its kinda weird too since it will miss and you'll feel it miss while idling every so often itll be smoothe for liek 10-20 sec then miss

02WS6Bird

iTrader: (2)

It was missing much worse Prior to the to new plugs i had 3 plugs that were damaged basically had little to no gap in them. It they were all gapped @ .055 since they are NGK TR55's as wella s the ones in there right now. This is why i asked how to check the coil packs, it doesnt really make sense to me at all. all the new plugs and wires are perfectly fine jsut like when i got them i dont really understand

slow78z28

iTrader: (1)

You should try pulling off each coil pack one by one and starting it if it gets worse then you know that coil is good if it doesnt change when you remove one then you probably found the problem.

SHINER

iTrader: (18)

you get a "leak Master" its fill s the lines up with smoke tofind a vacuum leak, thats the way to find a vacuum leak. If you can FEEL the misfire..i think your in trouble.....

02WS6Bird

iTrader: (2)

I dont really understand this method sorry please explain

nd as for vaccuum leaks what are all the vaacuum to check PCV, Brake Booster and intake?

02WS6Bird

iTrader: (2)

So To The Top everyone....

What are symptoms of a bad coil pack(s)? Whats the best way to check?

The car after heavy use and then a good brake seems to surge a little. drops under 500 RPMs and then goes right back to normal with a very minor miss that the computer does not detect- not even when loggin it in. Does that sound more like a vaccuum leak by chance? What would be best to check

Thanks everyone i really need answers to all of the above!

92SilverSHO

iTrader: (3)

anything electronic, usually the computer should pick it up, if its this bad, the computer would flash the ligh telling you of misfires, So for it not to pick it up, has to be something physical, like mechanical not linked to the electronics per say. im guessing you did a search on bad coilpacks? its rare one goes.

Syxx613

iTrader: (8)

how many miles are on ur car? this doesnt sound like a fuel or spark problem. sounds more like an air problem. the PCM is VERY good at picking up improper fuel or spark. but not nearly as good as finding unwanted air. or it could be as simple as this... if u have over 35000 miles, u might want to do a seafoam treatment. after time, ur intake will get gunked up with PCV gases and it will make the incoming air tumble and make ur car run like *** down low. such as coming to a stop sign or light and taking off from a light or sign. try the seafoam, u have nothing to loose. however, if u do the seafoam, change the plugs AFTER cuz it will make ur plugs useless after its done.

02WS6Bird

iTrader: (2)

31200 miles on it

Pewterpower

I had something kinda like what you are describing right after I installed a Vigi3600 stall. As I would slow to a stop, it would pull the idle down so low, that it would sputter and want to stall. I just raised the idle up a bit and the problem went away.

02WS6Bird

iTrader: (2)

Anybody? Symptoms of a bad coil pack?

Symptoms of Vaccuum leak?

02WS6Bird

iTrader: (2)

ANYBODY symptoms? Trying to trouble shoot here could most likely be one of the two from my asusmption but iw watn to knock out the most apparent problem and cros my fingers