Question about 1991 Honda Civic

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My 16 yr old boy's first car - 1991 honda accord -truns over but

Turns over but will not start. just passed smog 2 weeks ago; 125,000 miles. Rumor timing chain is problem...how can you be sure this is the problem?

By turning over sounding normal, if bad belt, wouldn't valves get bent causing additional noise or what????

Other things to try prior to this belt?
Problem occured after 100 mile freeway trip.
Thanks with any ideas!

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  • David Johnson
    David Johnson May 11, 2010

    to isolate the problem do a compression test, if you are not sure check fuel delivery and spark to plugs, Hope I can help you further.

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If i were you, I would check the throttle position sensor (or in your case the map sensor.) It is located on the throttle body. Usually with honda motors, it's always something to do with a sensor that wont let it start. If you dont have any grinding or tapping when cranking, or any problematic signs on your last road trip, then I would rule out any major mechanical defects. Depending on what type of motor you have, you may have variable timing... which may rule out the timing chain problem.

Anyways, to find your MAP sensor, follow your intake tubing up to the intake plenum. You will see where the plastic tubing (from the air filter box) meets the metal plenum. You will see the throttle body with a half of wheel looking thing, and it has the throttle cable attached to it. There should be a little black box on the back side of it (or the top depending on motor.) It has a wire harness attached to it. Remove the harness, and remove the 4 screws that hold it in place. When you remove it, take it to an autozone or parts store to be tested. Or you can just buy a new MAP sensor, replace it, and see if that is the problem. (A junkyard may be a great hit-or-miss solotion to getting a new one for cheap.) If that does'nt solve your problem, then try looking down by the air cleaner box. Look again at the tubing comming out the back and leading up to the plenum. Your car may be epuipped with a Mass Airflow sensor as well as a MAP. Basically, this just tells the motor that there is air going into the motor. It acts the same as your MAP sensor, but the location is different and tells the computer how much air is going in, and how much fuel it needs to inject into the motor to create the correct mix. If either of those sensors are bad, you will smell alot of gas when you try to crank it over. It wont fire because the vehicles computer is thinking that there is a clog or restriction in the air, and wont ignite the fuel because of improper mixture.

Hopefully that solves your problem!

Posted on Dec 23, 2008

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