92 SC300 not idling
12-14-12, 03:00 AM
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92 SC300 not idling
I recently bought a 92 SC300 that was having trouble idling, so we unplugged the forward most oxygen sensor and it ran a little better but not a complete fix, then the next day it got worse. It seems like its not getting enough fuel because i have to floor the pedal to keep it running and idling, then when i put it in first and try to take off, it kills its self, even if the pedal is to the floor. any suggestions?
12-14-12, 09:11 AM
#2
There are many many threads on idling rough and such here on CL that could help you.
First thing I would do is run a container of injector cleaner through the fuel system, maybe even 2. Then see if the throttle body is dirty, clean the AFM, (not with regular MAF cleaner), Clean the IACV if it hasn't been done recently, There is a DIY here on CL as well to do that. Also could be the fuel pump quitting, a vacuum hose that cracked, broke, or disconnected, spark plugs and wires, TPS, the IACV might be not only dirty but broken, busted injectors, ECU if the idle is very bad, or even the fuel pump control ECU.
Could definitely be the O2 sensors. Bank 1, bank 2, sub oxygen sensor and so on. After running/driving it for more than 5 minites, if you ever do, look under the car and check to see if the catalytic converters are red hot. That would mean they are clogged. Lot's of thing's to check and rule out as the problem I know...
Start with the cheaper/most probable part to break to replace/clean. Post what the issue was when done...
**This thread should be in the Performance & Maintenance Forum, not SC300/400 FYI...
First thing I would do is run a container of injector cleaner through the fuel system, maybe even 2. Then see if the throttle body is dirty, clean the AFM, (not with regular MAF cleaner), Clean the IACV if it hasn't been done recently, There is a DIY here on CL as well to do that. Also could be the fuel pump quitting, a vacuum hose that cracked, broke, or disconnected, spark plugs and wires, TPS, the IACV might be not only dirty but broken, busted injectors, ECU if the idle is very bad, or even the fuel pump control ECU.
Could definitely be the O2 sensors. Bank 1, bank 2, sub oxygen sensor and so on. After running/driving it for more than 5 minites, if you ever do, look under the car and check to see if the catalytic converters are red hot. That would mean they are clogged. Lot's of thing's to check and rule out as the problem I know...
Start with the cheaper/most probable part to break to replace/clean. Post what the issue was when done...
**This thread should be in the Performance & Maintenance Forum, not SC300/400 FYI...
Last edited by SC400slide; 12-14-12 at 09:18 AM. Reason: added information
12-17-12, 10:23 AM
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yesterday i ran a bottle of fuel injector cleaner in it and that helped alot, today im gonna take out the injectors and clean em real good and go from there. I'm thinking the idle air control valve could be shot to. I''ll post on here when i get it going like it supposed to.
12-18-12, 02:13 PM
#5
Fixing that kind of stuff always reminds me of an episode of house: Diagnose, try a fix. If it doesn't work diagnose and try again. Keep repeating until you are fed up, decide to pull the plug, sell off the internal organs and scrap the shell. J/k
You getting a CEL?
You getting a CEL?
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