funkymack

I have a 1998 gs300 and out of nowhere the vehicle started running rough turned the check engine light on and vsc. Scanned computer said cyl#5 has a misfire and random cylinder or #3 or #1 cyl.. Went to check it seemed like the coils were going bad.. checked the brand new plugs that were installed with wires about 1,000 miles ago and they were still good.. replaced the coils with coils from my 01 gs motor (they were perfectly fine) still same problem. Took of the fuel rail inspected injectors number 5 was cracked and missing seal. I then replaced all injectors with new seals and fuel rail from my 01 motor.. problem still there. check injector wires and seems like they send signal to injectors on and off. sometimes it'll run good and misfire for a few seconds out of nowhere. Sometimes it'll misfire a lot. Took out the computer and noticed some dark brown fluid on one of the connectors.. is that normal? has anyone seen this issue before? I haven't replaced the computer yet but my guess that may be the problem...

Mr Jokster

iTrader: (8)

Dark brown fluid as in oil? I really dont think thats normal

AKS14

Check the VVT solenoid.
Its located on the drivers side of the head, remove the front upper timing cover plastics (should be like 6 allen heads) and then there is a single 10mm bolt iirc that holds the VVT solenoid on, you can pull it out and look at it, see if there is oil caked up in it, if not, you can test it with a multimeter iirc.

Its a 125$ part from lexus, takes 15 minutes to install, and if you are having missfire issues and the VSC/CEL light click on that may be the issue.

My car one day started missfiring randomly at idle, VSC/CEL came on, then went back to normal but VSC stuff stayed on, pulled codes and had a missfire and a VVT control code, replaced the solenoid and everything seems to be fine.

Deadpool88

Were those the only codes thrown? When my VVTi solenoid went bad it was throwing codes for timing being off as well.

ttaylor993

This may be a long shot, but I replaced my plugs and wires and not too long afterwards starting getting misfire codes. Plugs were Denso but wires were off-brand. Lesson-learned; always use OEM wires with these cars.

funkymack

Plugs are Denso as well but wires are beck n arnley so Im guessing those are pretty good. I will be double checking everything today so Ill keep you guys posted. Although there was no VVT codes I will double check that as well..

offbad

iTrader: (5)

i'd only use NGK or Denso electrical for japanese cars for what it's worth

funkymack

oaky so turns out injector 5 was definitely causing a full misfire while driving or at idle.. but then it only started misfiring at idle after that was repaired and got a vvt code so i replaced the vvt solenoid and bamm works great! thanks for all your help guys

funkymack

at first this code was not in there but when it came on i referred to this and it worked. thanks a lot!

Deadpool88

No problem, how many miles are on your car?

Mine didn't throw a "hey your OCV is bad" code but misfire codes and anything timing related it did.