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#1
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93 civic lx, engine won't start; numorous questions
My car turns over but will not start. It showed no obvious symptoms other
than not starting one morning. The battery has plenty of juice and the starter is fine. I peeked through the oil filler hole and saw the valves moving, so it is not timing belt. The distributor is new, so that rules out the ICM, coil and the other sensors in there. The rotar and cap are new as well. The wires have acceptable resistance and the sparkplugs spark when tested. When I turn the key to the on postition I can hear the Fuel pump charge. I don't have a fuel pressure guage so I can't check that, yet. I tested the voltage to the Idle Air Control and also the resistance, both good. I started to do the same to the Throttle Position Sensor and got stuck. I checked the voltage and it was fine but can't figure out how to check the resistance. The book is kinda cryptic with it's proceedures and refers to pictures that have the important stuff out of frame. So, I was under the impression that TPS sensors can be replaced, fairly cheaply too. But I can't see how to get it off. It is attached to the throttle body but not by any fastener that I've ever seen. The end that is exposed looks almost like a rivet. My friend and I have gone back and forth over whether it's a fuel problem or a sensor problem. There are no error messages in the ECM. Questions: 1. How do I test the restistance on the TPS? 2. How, if needed, do I replace the TPS? 3. Any other ideas on what it could be? |
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#2
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Hi
Are you getting spark on your plugs while the plugs are on the car? In other words, you are getting spark using your distributor, right? At the risk of stating the obvious, but just because plugs spark in one car, doesn't mean they'll spark in another one. I wonder if your fuel injectors are working. Not being absolutely positive here, but the car would try to start regardless of trottle position, wouldn't it? It may not run right or keep running, but it should do something indicating that you're getting spark and gas. If you have a scope, perhaps make sure you see pulses going to the injectors while starting. It could also be that the belt jumped a couple of teeth. Hope this helps you find it. Remco |
#3
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Hi
Are you getting spark on your plugs while the plugs are on the car? In other words, you are getting spark using your distributor, right? At the risk of stating the obvious, but just because plugs spark in one car, doesn't mean they'll spark in another one. I wonder if your fuel injectors are working. Not being absolutely positive here, but the car would try to start regardless of trottle position, wouldn't it? It may not run right or keep running, but it should do something indicating that you're getting spark and gas. If you have a scope, perhaps make sure you see pulses going to the injectors while starting. It could also be that the belt jumped a couple of teeth. Hope this helps you find it. Remco |
#4
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fnkymnky wrote: > Questions: > 1. How do I test the restistance on the TPS? > 2. How, if needed, do I replace the TPS? > 3. Any other ideas on what it could be? It is easy to test, the problem is that the book does not say what resistance you should see. Disconnect the three-pin plug from the TPS. Measure the resistance between the outer two pins. Pulling numbers out of my posterior orifice, I would say a normal TPS would read more than 500 ohms and less than 100 k Ohms. I would expect a few thousand ohms. Make a note of the result, let's call it x. Now measure the resistance between the center pin and one of the two outer pins. As you move the throttle between fully closed and fully open. You should see the resistance reading vary smoothly between something like 1/10 x and 9/10 x. Then measure the resistance between the center pin and the other outer pin as you open and close the throttle. Again, you should see the resistance vary between something like 1/10 x and 9/10 x, but this time in the opposite direction of what you saw before. That said, a failed TPS would not cause the engine not to start. It could give you erratic idle, but the engine would still start. |
#5
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Sorry about the double posts -- using the new google beta stuff.
On checking the signal to the injectors: I think you could put a small bulb in its place to see if they are fired. Remco |
#6
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Instead of asking all these questions, maybe the most obvious question
is being missed: __ Why has this car stopped running overnight, all by itself__ ? ? ? Is that the question you want the answer to, or don't you need your car for the purpose of going somewhere ? ? 'Curly' |
#7
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"fnkymnky" > wrote in message
> The sparkplugs spark when tested. <good part snipped> > When I turn the key to the on postition I can hear the Fuel pump charge. > I tested the voltage to the Idle Air Control and also the resistance, both > good. I started to do the same to the Throttle Position Sensor and got > stuck. I checked the voltage and it was fine but can't figure out how to > check the resistance. So, I was under the impression that TPS sensors >can be replaced, fairly cheaply too. But I can't see how to get it off. > My friend and I have gone back and forth over whether it's a fuel problem > or a sensor problem. There are no error messages in the ECM. Could it be a bad cold sensor, Bad intake temp sensor, Bad fuel injector power source, Bad fuel mixture, Bad timing? Got a timing gun? Smell gas at plugs? I am assuming that the CEL light goes on and off as usual. If you want to remove the TPS, drill out rivets but no replacement parts available. Still connected, the TPS voltage goes from zero to five. Five being at full throttle with ignition on. To reset the cold sensor, just unplug the connector and start it up. |
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