Justin Gibbons

My car is missing, kinda like its being held back or something....engine is very rough as it revs...seems that the problem is with cylinder 4...switched, coils, injectors...still have the problem...could this be the computer?

secondly, do Ls1's fire each cylinder individually, or each bank, or i don't know...


...so frustrated!!!

Also, can i use a computer from another year f-body to see if the comptuer is the problem?,
guy at the local part shop said a 99 silverado computer might usiable, that doesn't seem right to me

Justin Gibbons

anyone have anything for me/

Justin Gibbons

Here are the plugs from the passenger side, they were all installed at the same time...the one thats still white is cylinder 4;

Any ideas why this is happining?

98Aggie

iTrader: (19)

Is the plug wet or dry when you removed it? Can't tell by the picture.

Justin Gibbons

its dry

moehorsepower

iTrader: (3)

Obviously it looks like it is not getting much fuel, First swap the injector out to another cylinder then check it again, If that plug now shows the same signs then either you have a faulty injector or a wiring issue on that bank...

Justin Gibbons

changed out the injector...still have the same problem,,could this be due to a head gasket leak, or problem with the bank.

98Aggie

iTrader: (19)

Listen to the injector to see if it is firing, doubt it is since the problem stays with that cylinder. More than likely you have a wiring problem (Lt Blue/Blk wire running to the computer)

joecar

See if you get these 2 signals for that cylinder:
- injector (fires the injector)
- coil primary (saturates/fires the coil)

Use a DMM or a test light or whatever... it should indicate a pulsing signal while cranking/running.

If you're missing either of those, work backwards along the wiring, see if there is continuity all the way back to the PCM connector.