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I have a 2005 honda civic GX ( ngv) with 235k miles, i just

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purchased it, had head gasket...
I have a 2005 honda civic GX ( ngv) with 235k miles, i just purchased it, had head gasket issues that was fixed, the problem on this vehicle is that it runs, the about 30 seconds later it dies down, i have to crank it about 20-30 secs to restart if it
will restart but running after 5 min it would start again, andfor 30 seconds, and do the same thing, has no check engine light nor pending light
Submitted: 2 years ago.Category: Honda
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Answered in 8 hours by:
11/8/2015
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Honda
Satisfied Customers: 23,519
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
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Hello and welcome to JustAnswer!

You may be losing spark, fuel or both. The symptoms are often caused by a failing fuel pump.

The first step in diagnosing the problem is to see if any fault codes are setting. Anything causing a loss of spark should set a code and that will give a starting point for testing. Have you checked for codes?

Have you tested fuel pressure at the time it won't start?

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Customer reply replied 2 years ago
No codes has no fuel pump, its clean natural gas, has 3600 psi tank , and hAS 2 pressure regulator,it does not have terminal to check the pressure, although it does have a sensor at the end of the fuel rail
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

I wasn't aware that it was a CNG vehicle.

How did you determine there were no fault codes?

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Customer reply replied 2 years ago
I have 2 scanners, no pending or actual codes
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

You have an actual scan tool?

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Customer reply replied 2 years ago
i have 2 scanners
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

Is communication possible with the ECM at the time it won't start?

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Customer reply replied 2 years ago
I have not check on tHat, how should i check on that?
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

You would use the scan tool to see if you're able to get in and still look at data.

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Customer reply replied 2 years ago
I will do and come back to you
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

Ok.

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Customer reply replied 2 years ago
i am not loosing connection with the computer still giving me some live data
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

Are the cam and crank sensor signals present and in sync?

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Customer reply replied 2 years ago
My scanner is a common one i dont think it has the option to receive and record those impulse, though the injector wires were tested with noids and they had lights, one thing more i can test is the sparks on each coil , this is an indirect testing of the cam and crank sensor right?
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

What is the brand and model of what you're using?

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Customer reply replied 2 years ago
Autel maxdiag the european model
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

Are you able to see engine RPM at least?

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Customer reply replied 2 years ago
when it is running
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

At the time it cranks and doesn't start see if it shows RPM.

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Customer reply replied 2 years ago
The rpm on the tachometer or the scanner
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

The scan tool.

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Customer reply replied 2 years ago
i will try tonight and let you know, are you thinking the problem is the ecm?
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

It's possible but not likely.

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Customer reply replied 2 years ago
the scanner is reading the RPM WHEN IS RUNNING
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

Yes, certainly. You're concerned with what it does when the engine does not start.

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Customer reply replied 2 years ago
It still read when crancking without runing too reading about 160 to 180 rpm
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

Have you tested for spark at the time the engine isn't starting?

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Customer reply replied 2 years ago
that would be my next step today
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

Ok.

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Customer reply replied 2 years ago
All sparks are ok, i also checked the fuel pressure at the rail and it was about 40 but there was some gas leak on the gauge hose
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

Can you check injector pulse?

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Customer reply replied 2 years ago
i did check with noid , the light was pulsating
by the way , it is not running that first 15-20 seconds run, it is cranking though
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

Have you taken a fuel sample to check for contamination?

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Customer reply replied 2 years ago
Where can i check a clean natural gas and in what container that can hold 3600 psi pressure
Customer reply replied 2 years ago
The car is at the dealer, they could not fogure out
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

I had forgotten that it was CNG when I asked about the fuel sample.

Is it at a Honda dealer?

What parts were used for the CNG conversion?

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Customer reply replied 2 years ago
It is factory cng . Not convrted from gasoline
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

Is it at a Honda dealer?

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Customer reply replied 2 years ago
took it on monday and they domt know what is going on
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

Do you know what has been done?

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Customer reply replied 2 years ago
Head job, including valves, timing belt, 30k ago low pressure and hi pressure cng filter, compression is above 150, no codes ,all coils have sparks, and the injectors has electricity, the cng pressure on the rail. Was about 42 psi. And now is not even running the initial 15 seconds
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

Has it been checked for an exhaust restriction?

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Customer reply replied 2 years ago
No i did not try thay, i will remove the exhaust manifold and try it tomorrow
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

You'd want to remove the pipe from the manifold, you can leave the manifold in place.

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Customer reply replied 2 years ago
But the cat converter is before The pipe, its one body with the exhaust manifold, and mostly the restrictions are in the cat converter.
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

If the converter is part of the manifold then the manifold would have to be disconnected if you were going to attempt to run it and check it that way.

The correct way to check for an exhaust restriction would be to use a backpressure gauge at the upstream oxygen sensor bung.

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Customer reply replied 2 years ago
i should do it tomorrow
Mechanic for Honda: sprinkles08, ASE Certified Technician replied 2 years ago

Ok.

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sprinkles08
sprinkles08, ASE Certified Technician
Category: Honda
Satisfied Customers: 23,519
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Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience

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