93 civic lx, engine won't start; numorous questions
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Joined: Dec 2004
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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?
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?
Thread Starter
Registered User
Joined: Dec 2004
Posts: 2
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The distributor is new, so that rules out the ICM, ignition coil and the various other sensors that are housed there. Furthermore, I have spark at the plugs. So I don't think it is a fire problem, it is either a fuel or sensor problem.
Senior Member
Joined: Jan 2003
Posts: 1,994
Likes: 2
Crank it & then pull the spark plugs. Wet with fuel? If not, maybe the injectors aren't firing. All injectors get full-time battery voltage from main relay (yellow/black wire?). The ECU closes the ground side of the circuit to fire each one. Check injector voltage against ground, not from 1 wire to the other.
Many of the sensors would just make it run badly. At least it would cough & sputter when you tried??
Many of the sensors would just make it run badly. At least it would cough & sputter when you tried??
Senior Member
Joined: Apr 2003
Posts: 121
Likes: 0
From: H-Town
Try This
Since you check everything try this:
1)check the firing order of the spark plug wires.
2)check for bad spark plug or defective spark plug.
I install a bunch of upgrades and i screwed it up AND WOULD NOT START. made ME LOOK like an ASS AFTER MY FRIEND CHECK FOR ME. THEN it started normal again.
1)check the firing order of the spark plug wires.
2)check for bad spark plug or defective spark plug.
I install a bunch of upgrades and i screwed it up AND WOULD NOT START. made ME LOOK like an ASS AFTER MY FRIEND CHECK FOR ME. THEN it started normal again.
