Last post on Sep 21, 2012 at 7:52 PM
You are in the Honda Civic GX (natural gas)
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Honda Civic, Engine, Alternative Fuels, Hybrid Cars, Hatchback
#56 of 67 engine sputters, hesitates or experiences unequal power delivery, you have
Jan 25, 2010 (10:12 pm)
I am new to this forum so bare with me, this may be a long post. I have read through the majority of the Honda Civic GX (CNG) threads since I own a 1998 Honda Civic GX and am having some troubles with it. Awhile back the check engine light came and it was idling roughly and would sometimes hesitate upon acceleration (as if some cylinders were misfiring). The problem seemed to be exaggerated in cold weather. So I took it to the local Autozone to have them hook up their computer to see what the computer said the problem was. It was reading multiple misfires and catalytic converter. So in effort to remedy the problem I replaced all spark plugs, wires, distributor cap, and rotor. However, that did not solve the problem.
I also adjusted the value clearance since a few mechanics thought that may have been this issue but that didn't fix the problem either.
So I settle for the last resort, I took it to the honda dealership CNG mechanic. He diagnosed that I need to replace all four injectors (550.00 ea), new fuel filter, and catalytic converter. He quoted me a total of something over 3000.00, which I had a hard time swallowing. So I paid for the diagnostic and to have them replace the fuel filter but I held off on the injectors and catalytic convert since I figured I could get them cheaper online.
I found a site that refurbishes CNG injectors (Rockauto.com) and sent my injectors in. They claimed they were able to refurbish 2 of the four. So I bought two new ones from Autozone. The injectors from Autozone look exactly like the originals and were only 167.00 a piece with shipping. Has anyone had luck with CNG injectors from Autozone? I am a bit suspicious of them since they are half the price of the other cheapest online injectors I could find.
Once I had all four injectors (2 refurbs and 2 new from AZ) I installed all four but the check engine light came on again and it still idled a bit rough and hesitated upon acceleration at times. I was able to drive it around town fine but it just wasn't running up to par.
So I researched about troubleshooting faulty catalytic converters and found out that engine sputters, hesitation or unequal power may result from a bad catalytic converter. Also, I noticed at times on the freeway the car acted as if it had a govenor on it and this was one of the symptoms of a bad cata converter. After reading about these symptoms I was certain that was my problem. So I decided to remove the catalytic converter to see if I could determine whether or not it was bad. Upon removal I could clearly see that the insides were not intact; therefore, I performed a little surgery to help determine if blockage caused by the broken internals of the catalytic converter was causing the car problem. I completely removed the internals and reinstalled the catalytic converter but the check engine light is back on and the engine sputters (misfires) and hesitates upon acceleration still.
Any ideas as to what the problem may be? Is it possible that some piece from inside the catalytic converter could have fallen out and causing blockage farther down the exhaust pipe? Could the lack of internals result in mis-representative O2 reading from the two sensors on the catalytic converter, thus resulting in sputtering and hesitation upon acceleration? I am all out of ideas. Any suggestion would be helpful. Thanks and sorry for the lengthy post.
#57 of 67 Re: engine sputters, hesitates or experiences unequal power delivery, you have [qb79]
Jan 26, 2010 (8:02 pm)
qb...here is my story: I have a 2000 Honda GX and I used ONE time TRILLIUM brand cng fuel, and I only made it a few miles when I felt a miss in the engine. About ten miles later or so while on the freeway, my check engine light started flashing and it would hardly run. I limped home not knowing all the damage that was being caused by the plugged/open injector (oil from their pumps!), including catalytic converter, fuel injector, control module, 2 o2 sensors, plugs, wires, distributor, rotor, and anything else electrical under the hood that I can't remember right now. $2000 later, it now runs great and after a valve job, I obtained 50 mpg/hwy for the first time using my Scangauge II. This cool device will also read out your trouble codes, readouts for many functions such as mpg, actual mph, volts, rpm's, water temp, etc. and is also a trip computer! Overall, I can get 42-43 mpg and go over 500 miles with my two tanks. (extra one is behind the front seats). So, I would definitely replace your catalytic converter (bought mine online much cheaper than anywhere else). I also bought an injector from AutoZone and it has performed flawlessly for over two years now. And make sure that your bottom (secondary/after catalytic converter) o2 sensor is the correct one! Using your car year and model with online and AutoZone WILL NOT give you the CORRECT one and your check engine light will stay on, plus it will run roughly. Make sure you get the PART # from Honda, then buy it at AutoZone. It has a different shape than the top one, at least my 2000 one does. Now, if that doesn't solve your problem, make sure you get the actual Honda spark plug wires and plugs! That was the last thing that finally kept my check engine light out! They told me that the car is very sensitive and needs the actual replacement parts for that, and that was the only thing that they said that turned out to be true. LOL Good Luck!
#58 of 67 Fuel pressure regulator
May 24, 2010 (10:23 am)
I have a 2000 Honda GX with a with a Keihin fuel pressure regulator. It appears that the diaphragm is showing serious signs of wear and is need of replacement. Honda sales the FPR for $2,041.00, and apparently owns all the rights to exclusively sale this part. My mechanic has tried silicone glue on the dipragm for the time being but a better fix is needed. The FPR part # is 16740-PDN-A01. Any suggestions would be appreciated
#59 of 67 Re: Fuel pressure regulator [robmmar]
Aug 07, 2010 (12:44 pm)
That part number from Honda is the entire assembly...not so sure you would need that...autopartswarehouse has just the pressure regulator for under $100 with free shipping. I usually get my parts from AutoZone or Rock Auto Parts, but neither one of those seems to have it. Let me know what you find and if it fixes the problem. How did you know it was needing replacement without looking at it? Thanks!
#60 of 67 Re: Fuel pressure regulator [adea]
Aug 07, 2010 (1:56 pm)
The Autopartswarehouse system is wrong...very wrong. Your first clue should have been that they list the same regulator for both the "GAS, D16Y7" and the "CNG, D16B5" even going so far as to show the GX as having the D16Y7 engine. Pretty sad website if you ask me.
#61 of 67 Performance Mods on 2009 Honda Civic GX
Sep 24, 2010 (4:46 am)
I’ve got a 2009 Honda Civic GX and I’d like to see if I can squeeze a little more horsepower out of her by installing some typical performance upgrades like a high-flow air intake and opening up the exhaust. Can those kinds of performance mods be done on the GX cars without messing up anything else, like the on board computer, engine monitoring system, etc.? Please advise; thanks much! –
#62 of 67 Re: Cylinder 1 misfire? [jc_auto]
Feb 08, 2011 (10:19 am)
thoughs guys at "Accurate Injector Service" do realy good work . saved me 300 bucks on my cars fuel injectors . www.accurateis.com or salesaccurateis.com .. for email . I also sent them my toyota fuel injectors and my dad sent them the fuel injectors out of his mercury marine boat engine. all with great results .
#63 of 67 Re: filter changes [lakewood90712]
Feb 11, 2011 (1:17 pm)
How can I pm you?
#64 of 67 Re: filter changes [sfcascooter]
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Feb 13, 2011 (6:05 am)
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