Question about 1998 Toyota Corolla
I just had a head gasket blow on one side of the vortex motor. After he put it back together he said he can't get it to fire on Number 1 cylinder. He didn't have his tester with him, but will bring it tomorrow. It is not the spark plug or wire. I have the type of injector that has to replace all at same time (I believe it's referred to as "spider" type). He told me he converted his van from what I have to the type where you replace only the bad injector. I have 2 questions. First one is - would that conversion likely be expensive. Second one is - if I can find fuel injector at salvage yard would it be an ok idea to replace mine with used. My mechanic is not keen on salvage yard parts for anything, but I'm just wondering about it. Anyone have any suggestions?
SOURCE: Check engine light on
There are three kinds of gasoline engine misfire scenarios, first there is the "under load" misfire and there is the "at engine idle" misfire, and finally there is misfire continuously. All engine misfires exist because one of three things has occurred. First, a cylinder has lost compression, a cylinder needs a certain amount of compression to operate correctly. Second, the ignition system has failed or is failing intermittently, spark is needed at the time of compression to ignite the fuel air mixture. Third, the fuel air mixture is incorrect, proper mixture is needed for the ignition system to ignite fuel properly. If any of these conditions occur in the engine, the engine will misfire.
1. Low or no compression can be caused by
a. burned or leaking intake or exhaust valves
b. worn or broken piston or piston rings
c. worn out camshaft
d. wrong weight motor oil was installed holding the cam followers from adjusting
e. broken valve spring
f. failed head gasket.
2. Ignition system has failed or is failing
a. spark plug has fouled or is worn out
b. ignition coil
c. spark plug wires have shorted
e. engine control module coil driver has failed
3. Fuel/Air Mixture is incorrect
a. vacuum leak at the intake manifold
b. fuel injector has failed
c. EGR valve is stuck open
d. mass air flow sensor has failed
e. oxygen sensor has failed
f. air intake boot is cracked
1. fuel injector has failed or is failing
2. spark plug wire has shorted
3. spark plug is worn out or is cracked
4. ignition coil has failed is failing
Testing a coil on the car is pretty easy. No special tools are required. Just remember to be careful, the amount of electricity generated by your ignition system can be dangerous. If your coil is already off the car, or if you would like a more specific data-driven test, you can bench test your coil. To set up the test, remove one spark plug wire from its plug, then remove the spark plug using a spark plug socket. Next put the spark plug back into the spark plug wire. Be careful not to let anything drop into the empty spark plug hole -- very bad.
Posted on Dec 07, 2008
SOURCE: Code 25- Lean Air-Fuel Mixture
Here is the real scoop form a real Toyota Service Manager, who is NOT interested in ripping you off or steering you wrong:
I take Bosch plugs out of engines quite regularly. Guys come in, with all kinds of lean codes, and I tell them that the plugs are incorrect. They are, in fact, not correct for your engine. I take out the Bosch/Splitfires/whatever, and put in the right Denso plugs, and everything is copacetic. Believe it or not, the engine IS designed with a specific Denso plug. Regarding the injectors, he is indeed ripping you off. Replacing 6 injectors for a code 25 is BS.
Please respond back if you have any other questions.
Posted on Feb 10, 2009
if you dont have spark why is the mechanic worried about the fuel system. also are you sure it is in time. with the #1 cylinder all the way up the rotor should point to #1 plug wire make sure you look at the cap #1 might fire on the opposite side of the cap as to where you think follow the trace on the cap to #1
Posted on Apr 05, 2009
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