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1999 Honda CRV Weak spark

Tiny
KEUNG71182
  • MEMBER
  • 1999 HONDA CRV
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 125,000 MILES
I have not been able to start my vehicle. I replaced the distributor, cap, rotor, plugs and wires. It sounds like it wants to start but when it does, it just chuggs at low rpm. When I try to give it gas, it doesn't do anything. I pulled off the cap and check spark at the coil, and it was good( maybe a little weak). But when I check it at the wires, it is very weak. The car died on me while driving up hill. The timing belt is still there because I can see the cam moving. Could the timing maybe jumped a couple of teeth?

thanks,
George
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Friday, August 8th, 2008 AT 7:24 PM

10 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi George,

If the sparks seems weak, the ignition coil is faulty and a replacement is necessary.
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Saturday, August 9th, 2008 AT 4:11 PM
Tiny
KEUNG71182
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  • 6 POSTS
I have changed it out with a known good one.
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Saturday, August 9th, 2008 AT 6:40 PM
Tiny
KHLOW2008
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Hi George,

Have you tested the fuel pressure at fuel rail?

If the pump is working, then regualor might be bad. If pump does not work when ignition switch it turned on, it could be the pump or main relay that is faulty.
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Sunday, August 10th, 2008 AT 2:45 AM
Tiny
KEUNG71182
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  • 6 POSTS
I have fuel pressure. I even tried to spray some starting fluid in the throttle body. The compression is low. 110 118 118 118. I am going to do a leak down test, but would a timing belt that jumped a tooth make the compression that low?
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Sunday, August 10th, 2008 AT 12:52 PM
Tiny
KHLOW2008
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Hi George,

Normally a skipped tooth would not cause low compression, weak rings would. Do a wet test by pumping some engine oil into cylinders through plug holes, crank engine to get oil distributed and test compression again.

Had the engine overheated or been lying around for a long time?
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Monday, August 11th, 2008 AT 7:35 AM
Tiny
KEUNG71182
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Okay, I tested the coil and its good. I tested the crank sensor, and its good. Im not getting a ignition signal from the ecu to the distributor. Bad computer?
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Thursday, August 14th, 2008 AT 9:44 PM
Tiny
KHLOW2008
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Hi keung71182,

The distributor provides a signal to the ECU, not the other way round. Most probably the ICM is faulty or the coil sparks are too weak.
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Friday, August 15th, 2008 AT 7:03 AM
Tiny
KEUNG71182
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On the diagram it shows the igntion output signal coming from the ecu to the distributor. Thats basically what I went off of. Doesn't the ecu have to tell the distributor to fire when it has all the signals from the other sensors( ie. Crank, cam, tdc)?
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Friday, August 15th, 2008 AT 8:14 AM
Tiny
KHLOW2008
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Hi George,

If you mean the A21 and A22 terminal of ECM is not providing any voltage with ignition switch on, the ICM is faulty.
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Friday, August 15th, 2008 AT 8:38 AM
Tiny
KEUNG71182
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It was the computer that was bad. I installed a new one, and it works great. It is the yellow/green wire sending the signal to the icm.
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Friday, August 15th, 2008 AT 10:26 PM

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