My brother has a 92 Celica w/5SFE engine in it. Recently it has had a rough idle, and misses during acceleration. When I give it full throttle the car smooths out. I'm not sure what this is. I've looked at the cap & rotor and they seem fine. The plugs seem pretty clean. I'm thinking it could be a bad injector??? If anyone has any ideas let me know. I'm going to be looking at it tomorrow morning. A couple of times he has started it and it was running smooth when cold, but once it warmed up it started doing the same things... Any ideas? Does anyone know the ohm range for the injectors to test them? I've heard that a bad injector can usually be found by testing the resistance across it and then comparing to the rest.
Might be something like 13.8 ohm. Could be a partially plugged injector. When the engine is cold, a 5th cold start injector may be present and provide more fuel. Once the engine is warm, this injector cuts out.
Thanks Toyo, I'm heading to the junk yard tomorrow to get a bunch of injectors and then start replacing the old ones on the car. I've got to get the car running good so my brother can sell it.
I'm not sure that it is the MAP sensor because it does not buck/jerk as you describe. It has a definite misfire @ idle and acceleration. No misfire @ WOT. Does the 5th injector kick on @ WOT for added fuel? I picked up 4 injectors at the junk yard on saturday and a couple of TPS sensors and what ever else I could find. I didn't see any MAP sensors though. Where is it located on the Celica? Also, is it pretty hard to get the fuel rail out? It looks like it's going to be a pain.
Ive had issues lately with my idle. Just like yours...itll smooth out after giving it some gas. Ive already done cap, rotor, plugs, egr valve and modulator, iac. Whew! All with in the past month. It idles at 1200-1400 Ive been messing with the tps but I think that is the next thing to be replaced too. Hmm I dont think the 92-93's had the cold start injectors on'em. I could be wrong tho. Lemme know what you figure out....could solve my problem too!
The engine may not have a cold start injector. It seems to have a cold start valve. This may adjust the fuel pressure or something else to kick up the fuel flow into the cylinders.
The MAP sensor would be somewhere on the throttle body. Find where the throttle cable attaches to the intake and look around. It should have an air pressure sensor probe that goes into the intake air system, and a wire harness attach plug.
If changing the injectors, you might replace the O-rings to prevent leaking. Suggest you look over the 5SFE manual for the Camry located on-line at the link below. This will give you an idea of what is involved to remove and replace the injectors.
My brother has a 92 Celica w/5SFE engine in it. Recently it has had a rough idle, and misses during acceleration. When I give it full throttle the car smooths out. I'm not sure what this is. I've looked at the cap & rotor and they seem fine. The plugs seem pretty clean. I'm thinking it could be a bad injector??? If anyone has any ideas let me know. I'm going to be looking at it tomorrow morning. A couple of times he has started it and it was running smooth when cold, but once it warmed up it started doing the same things... Any ideas? Does anyone know the ohm range for the injectors to test them? I've heard that a bad injector can usually be found by testing the resistance across it and then comparing to the rest.
Chad
dude go to autozone and buy a new coil for 30 bucks all your problems will go away
I drive a camry and it started doing the same thing exactly as you describe..
runs good when cold but when it warmed up the idle was very rough and it misfired alot when accelerating...
The problem was my fuel pump. it would run at 30 psi normally cold and when it warmed up it would drop to 15psi and the car would run like crap. see if you can find an inline fuel pressure gauge, (you are able to rent these from some places)
start the car cold and drive with it hooked up and watch the fuel gauge espessialy when the car starts to run crappy see if it decreases in psi
also another problem could be carbon build up on the valves. it covers up the valves and prevents them from closing all the way, run a detergent through the valves to clean off the carbon.
it may also just be a clogged fuel filter, or a weak ignition coil
dude go to autozone and buy a new coil for 30 bucks all your problems will go away
Dude, I went to Autozone and put the coil on and all my problems did not go away... I was messing with the wires some more and it seems that the #4 cyl wire was arcing to the valve cover and the plug was getting a weak spark. I put new wires on and my problems went away. Car will be for sale now.
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