My 1993 CSi Corolla hatch rev's are too high when idle. It usually sits at about 2000 but sometimes when I change gears it heads toward 3000 instead of dropping back. I've tried 'booting' the accelarator but this doesn't help. It's a manual choke. I bought the car privately 6 months ago and unfortunately it didn't come with a manual. Any suggestions would be appreciated......thanks, Kathryn
Some possibilities:
--the choke cable or the choke linkage on the carburetor is sticking, holding the revs too high.
--the gas pedal linkage, the pedal cable, or its linkage to the carburetor are sticking.
--the engine computer (if it has one) is failing, or has poor connections, or isn't grounded properly.
--various other sensors (if you have them) could be failing.
--the mechanism (computerized or mechanical) calling for more fuel to the carburetor when the air conditioning (if you have it) is turned on could be sticking or not working properly.
You should be able to test most of these possibilities while the car is standing still, with the engine running. Start with the choke -- have a helper move the knob and see if the engine responds properly, especially in the "off" position. Then have the helper operate the gas pedal while you watch what's going on with the carburetor.
Have your helper turn the a/c on and off. If you see a mechanical linkage to the carburetor move when the a/c is turned on, it should move back to its original position when it's turned off.
If any of these linkages (including the gas pedal linkage under the dash) are sticking, try spraying the affected area with a lubricant (like WD-40). If that doesn't help, spray lubricant into the cables, or replace them.
If all else fails, carefully check all vacuum lines in the engine compartment. An intermittent leak (or blockage) could be affecting engine speed.
SOURCE: car revs too high
you can ajust the engine rpm idle from the idle screw and air flow screw on the intek housing
SOURCE: headlight problem
need to change the turn signal the power for the headlight lows is going thought that switch
SOURCE: ''O/D OFF'' SIGNAL ON THE DASHBOARD
The O/D off means your overdrive is off. Have you accidently bumped it? It could be the start of a problem with electrical system. Usually a bad ground on your O/D may cause this. Intermitten problems are the hardest to track down and fix. Do you know what overdrive does? It's a gas savings device which cuts the engine's RPM's down by something like 1/3, like a 5th gear. That's why you are experiencing the jerking on the highway. Do you have an owners manual? If not a good place to look for one is at a local salvage yard, or online even. There may be something in there to explain this to you a little better than I did. I had a frien who had a simular problem. It turned out to be a bad fuse. It wasn't blown, it was broken, and it's element would jiggle around when he would hit bumps in the road. I don't know if this helped you, but it will give you place to start looking.
SOURCE: high revving toyota corolla 92 1.6 efi model
If you have the 4afe engine, normally you need to check the idle control valve if it needs cleaning. Check also the timing of the car.
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