Question about 1998 Toyota Camry
Originally had a p300, p301 and p304 engine code. Then I had the spark plugs and wires replaced at a local shop. The shop cleared the code, and it ran ok for a couple days. Then the check engine light went back on with a p300 code only. The tech at the shop indicated that I needed all three coils replaced. However, I tested the coils by disconnecting the wiring harness while the engine was running and each time the engine shut off, which tells me that they are ok. The tech also indicated that the fuel injectors were ok. Any other suggestions? The car still hestitates and stumbles, especially upon hard acceleration. Although it does run better than it had before I had the plugs and wires replaced. Thanks.
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Posted on Jan 02, 2017
i have came across simler problems in the past so im going to give you a list of four main suspects number 1; a broken or pereshed vacuum hose at the trottle body or inlet manifold.2 a blocked injector 3 a fuel injection system fault 4 a disconnected /leaking or perished crankcase ventilation hose.Before you try any of these by a can of fuel cleaner and run it through your system remember a small piece of dirt half the size of grain of salt is enough to cause this problem good luck.adrian
Posted on Feb 16, 2009
Most likely I a would suspect the fuel rail had moisture in it. If you checked emissions it would most likely show no HC and alot of 02 and no CO. If it does show alot of HC then I would suspect sticking valves intermittantly . The pinging really points to no fuel issue tho. If you pull the injector connector off and no change then I would remove the fuel rail and inspect. Also make sure the wires are in the correct locations. It easy to get them wrong.
Posted on Sep 03, 2009
If the check light is still on, you didn't
properly diagnose the original issues
and resolve them
The spark plugs seldom resolve misfire issues
What codes do you have now?
Check that your not loosing coolant
from a head gasket (white smoke)
Posted on Mar 10, 2011
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