Question about Honda Cars & Trucks
Run fault codes to find the sensor that is out and replace it . Timing is set by the CPU and position sensors and the problem may be in the HO2/S sensors that is requiring more fuel than is necessary.
Posted on Feb 15, 2014
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Posted on Jan 02, 2017
SOURCE: 1991 Camry running rich
check for vacuum leaks especially around the intake manifold gasket. Although the engine appears to be running rich, it could also be misfiring due to being too lean in one cylinder. When the cylinder doesn't fire the charge, it goes into the exhaust completely unburned and looks like a rich running condition due to the unburned fuel. If it is a vacuum leak causing the problem, the engine will run fine at road speeds but misfire at idle and not pass smog.
Posted on Feb 07, 2009
true the EGR can really make a change and it should have been the first thing too look at because its the cheapest and easy to install
Posted on Feb 19, 2010
Have a code test done (most larger parts stores do that free) In some cases you may need a shop to put a scanner on it to find specific out of range sensors that may not yet be bad enough to set a code.
I'd also check all vacuum lines and line connections as a small leak can alter the system readings. All the sensors on your car work together and the computer reacts to all the information it receives... Bad info in, bad info out...Only good testing will find the problem.
Primary sensors to pay attention to are the coolant temp sender, MAP sensor, throttle position sensor, manifold air temp sender, mass air flow sensor (if you have one) and the egr valve.and pcv valve (if you have them)
Good testing involves using a digital multi-meter and using instructions for that in chilton or haynes manuals. Replacing parts without testing can get really expensive. (but you have already found that out)
Posted on May 24, 2010
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