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No codes and no power, All the time this is a cng car, 1998

Customer Question
No codes and no power JA...
No codes and no power
JA: Is the power loss consistent, or does it fluctuate?
Customer: All the time this is a cng car
JA: What is the model/year of your Honda?
Customer: 1998 Civic gx
JA: Are you fixing your Civic GX yourself? What have you tried so far?
Customer: Iac valve. Fuel filter. Oem wires and plugs
JA: Anything else you want the mechanic to know before I connect you?
Customer: Nope
Submitted: 3 months ago.Category: Honda
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Customer reply replied 3 months ago
I unplugged o2 sensor and it ran better. Checked tps values at closed and wot. All correct. Unplugged tps and it idled around 1100 but ran smooth
Answered in 17 minutes by:
8/19/2017
Mechanic for Honda: Eric, Automotive Repair Shop Manager replied 3 months ago
Eric
Eric, Automotive Repair Shop Manager
Category: Honda
Satisfied Customers: 32,786
Experience: 20+ yrs. experience as repair shop manager and technician.
Verified

HI,

Is the check engine light on and if so, what are the fault codes?

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Customer reply replied 3 months ago
No check engine light. There was a P0193. I replaced the fuel filter and cleared the codes. No codes returned
Mechanic for Honda: Eric, Automotive Repair Shop Manager replied 3 months ago

HI,

Have you checked the exhaust to see if there is a restriction in the catalytic converter

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Customer reply replied 3 months ago
Not yet. I unplugged the top O2 sensor and it ran like it should. Didn't see the need to pull manifold
Mechanic for Honda: Eric, Automotive Repair Shop Manager replied 3 months ago

HI,

Unscrew the O2 sensor from the manifold and see if power is restored. With it out, there is enough for the exhaust to escape if the converter is partially plugged

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Customer reply replied 3 months ago
The guy I got the car from said the car ran good before he replaced the head gasket. Car started acting up after he changed it
Mechanic for Honda: Eric, Automotive Repair Shop Manager replied 3 months ago

HI,

That really opens it up - timing may be off a notch, which is what I would initially suspect - vacuum leaks, air intake leaks, vacuum hoses misrouted.

As much of a pain as it is, the first place really needs to be to verify timing marks are correct.

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Customer reply replied 3 months ago
If the timing was off, would unplugging certain sensors make it run correctly
Customer reply replied 3 months ago
By certain sensors I mean when I unplugged the tps it ran better just like when I unplugged the top O2 sensor
Mechanic for Honda: Eric, Automotive Repair Shop Manager replied 3 months ago

HI,

Usually not, but I never discount it.

Unplug the engine coolant temp sensor and see if runs better. If it does, I believe either an issue in the wiring harness with the 5v reference signal or the computer.

Let me know and also post the 17 digit vin number so I can pull the schematics

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Customer reply replied 3 months ago
Will get back with you later. Got to go school shopping for my kids
Mechanic for Honda: Eric, Automotive Repair Shop Manager replied 3 months ago

HI,

Ok, I am here everyday until around 9pm MST

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Eric
Eric
Eric, Automotive Repair Shop Manager
Category: Honda
Satisfied Customers: 32,786
32,786 Satisfied Customers
Experience: 20+ yrs. experience as repair shop manager and technician.

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