fstlane

iTrader: (2)

Running into the first problem with my GS. To try to keep it short, when I start the car it will crank fine, but after it cranks the RPM's will rev up like normal on startup. Then, the engine will stutter a few times between 0 and 1000 RPM, eventually dying. But, if I went through this process 2-3 times everything would be fine. Or, sometimes it wouldn't do it at all. Also, usually is only on start-up, but has happened a few times idling at a light, always in low RPM's. Has now gotten to the point of not staying running at all, on startup.

My theory, I used a bottle of fuel system cleaner, thinking it couldn't hurt to clean out the system. Could that have caused a clogged fuel filter, because of all the stuff that the cleaner removed from the fuel system and the filter caught?? Or, am I looking at a bad fuel pump. (Has 179k miles on it.) Maybe a bad ECU, maybe ignition related?? It did start worsening after I changed the O-ring on the distributor.

Any help appreciated, I can fix pretty much anything, just trying to get some ideas of where to start.

boxcarfan

i know on all the older V8s...the 400s that there was a kinda 2 stage thing. where the fuel pump will start up on 12 volts and then a relay would click on and lower the volts to the fuel pump to 8 volts and it would run on that. so if our cars have that, then it would start up on 12V and then when the revs come down it would switch over the 8Vs.

again i have no idea if the 1st gen GS has that. kinda doubt it tho...

fstlane

iTrader: (2)

Sounds possible, because like I said, it revs up everytime perfectly, then as the revs fall, is when the problem starts. I have several relays laying around I could try, is the one I would be looking for near the fuel pump ECU??

boxcarfan

its in the eng. bay......if there is to be one on the GS300

vtec-this

iTrader: (3)

check the maf

fstlane

iTrader: (2)

Damnit, that is probably it. I cleaned it when I did my last oil change, and the problems started almost immediately after.

Going to try to find one locally to test, will update with results.


Thanks for the reply's and help.

Lexatlast

iTrader: (5)

definitely sounds like the maf

vtec-this

iTrader: (3)

yea how did you clean it??? with cleaner and compressed air??? if so you damaged it

Triple C

iTrader: (2)

have you started looking for a new MAF yet

fstlane

iTrader: (2)

Cleaned it with the CRC MAF Cleaner, and let it dry in the sun.

Triple C, I have just started looking around junk yards today, and am looking around now.

fstlane

iTrader: (2)

Update, put a MAF in that I got from a local junkyard, and still have problems although it's a bit different now.

After putting the new MAF in, was letting the car sit and idle while I put my tools away I went to get in to go for a test drive, as soon as I sit in the car it dies. No stumbling, just straight died. Try to start it again, doesn't really want to crank over. Give it a few tries, nothing. Let it sit for a few minutes, after resetting the ECU, and try to start it again, starts up, idles fine for maybe 5-10 mins, then dies again. Try to start it and it will barely crank over, but dies every time.

Kind of at a loss here, is the "new" MAF bad also, is it fuel, ignition???

ndtoan85

sound like dirty or sticky IAC valve at the throttle body.. Idle Air Control,..... try to pull it out and clean it or just replace it.... it happens alot when it cold... when it warm up... it holds idle fine.

Maf doesn't cause that problem... it either starts or no start... but it will cause
lean mixture.. and dirty Maf will set engine code eventually.

fstlane

iTrader: (2)

Why the hell did Toyota decide to put phillips head screws on the IAC?? Took the throttle body off going to work on today, getting the two stripped screws for the IAC to come out.

Thinking about trying to clean it, but am considering just replacing it, anyone out there have a known working IAC they want to sell?

fstlane

iTrader: (2)

Bumping this as I am having issues with it again.

When I go to start the car it will turn on and then dies. I can try it 2 or 3 times same result. But If I start it like it's a carb'd motor with my foot on the gas and hold the pedal to keep it revved up to like 1000 rpm, it will stay running. Albeit idling very low, once warmed up the idle stays steady at 500-600.


Could it be a TPS issue? It actually just recently started doing it again after I moved and extended the wiring that was in the fender well that goes to the fuse box.

Any ideas appreciated, it's not crippling the car, but it is very annoying.

Johnny D

Could be a timing issue, ignition issue...when's the last time u did a tune up? What's your timing at? Last time u changed Ur belt?