99 toyota check eng.lt on code po300,po303,po305,po171,p0420
I added injector cleaner to try to clean the injectors and next step would be to put new wires and plugs in any other ideas before I go to the dealer thanx Dan
i have the same problem, but mine is reading misfire on cylinder 5 and a code for random cylinder misfires, plugs are relatively new. should i just replace all coils and wires and go from there? except my year is 98
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They are related mostly. All have to do with air intake. 170 codes are both sides running lean, to much air. 303 is a #3 misfire, could be a vacuum leak around the plenum. you replaced the spider. Could be the injector not seated right(smell for gas in the oil/dipstick), also could be a bad wire or spark plug. 1509 is an electrical problem with the idle air control motor. Check the plug for corrosion. Also wires usually break a round the plug. This also could be the problems with too much air.
usually a p0300 is a random missfire code due to a fuel problem probaly bad gas , use some in tank fuel treatment such as techron or lucas injector cleaner, after adding fuel disconnect negative terminal to batt, to clear codes and see what happens
First Dan these car s are very sensitive, you don't ned to go to the dealer go to you local auto-zone and have dem check the light its free. I could be a number of things but just for starters if you have more than 60,000 miles, it could mean you need oxygen sensor but don't guess have it checked and get back to me I will be more than glad to help. Good Luck. hey and leave me a rating.. thanks
Still need the codes.
Injectors can go "bad" in a couple of different ways; all they are is an electromagneticaly controlled nozzle. When the ECU "fires" the injector, it pulses a ground circuit for 4-8 milliseconds, the electromagnet powers up, the valve at the bottom of the injector opens, and the fuel shoots out, under pressure. The wire can be bad/chafed/corodded/ The electromagnet may be weak. The nozzle may be stuck. Lots of things. But, to put in an injector for a number 4 cylinder misfire (p-0304 code) would be one of the last things that I would do.