Fuel injector or O-ring leak?? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-23-2013, 05:41 AM   #11
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My plan is to use a cleaner on the MAF to see if that helps first. But I still have the leak down issue to deal with, the gas is going somewhere, Thanks again

Have you checked your oil level lately, if you had a leaky/stuck injector then you'd start seeing the oil level rise.
I've never heard of a bad/failing MAF actually effect fuel pressure, the only thing I know of that effects the fuel pressure would be the fuel pressure regulator, stuck/leaky injectors, or a hole somewhere in the fuel line.
If you want to see if any are stuck, then pull the injector electrical connector off, then get you a 9v battery (do not use the cars battery), and for a second touch the - and + form the 9v battery to the injector electrical connectors, and listen for a click, if you hear a faint click, then the injector is not stuck, but it could still be leaking internally.
If the injector is leaking internally, then replacing the o-ring is going to do nothing.

NOTE: if an injector was leaking too bad internally, then you'd expect a cylinder to misfire, and the fact that you smell gas when you start the car, has me leaning more towards a small pinhole somewhere in the fuel line.
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Old 06-23-2013, 05:48 AM   #12
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No, but a bad MAF might cause a gas smell/hard start/easy start if the PCM is dumping too much fuel.

As I said earlier, the MAF issue needs to be taken care of first.
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Old 06-23-2013, 05:59 AM   #13
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I agree Mike, because of the MAF code, that would logically be the first thing to address, I was just giving him some other things that he can easily check if cleaning, or replacing the MAF did not resolve the issue.

Even though it may very well be his MAF sensor, I admit I am still a little confused as to how a bad MAF could cause a loss in fuel pressure, I thought the only things that can seriously effect fuel pressure are the fuel pressure regulator, fuel filter, or the fuel pump.
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Old 06-23-2013, 06:03 AM   #14
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Nope, your correct. MAF has nothing to do with fuel pressure/volume.
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Old 06-23-2013, 03:18 PM   #15
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I am going to address that MAF tomorrow. All the injectors have the cliclking sound, the fact that it runs so well makes me think its just leaking enough fuel to effect the starting, as I say ,in the winter or when cold it starts normally and once running I see no engine performance issues ,either at idle or high rpm. Never noticed any gas in oil. It appears the injector is working but not closing completely, thats why I thought it may just be partially stuck or just a bad one. I appreciate the feed back from all of you and will keep you updated.
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Old 06-23-2013, 03:56 PM   #16
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If it is kind of sticking a little, perhaps you may try some fuel system cleaner to see if that helps. My personal favorites are seafoam (Works so good, it tends to finish breaking stuff held together by junk) or techron (The safer, but still effective alternative).
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Old 06-23-2013, 06:26 PM   #17
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Next time you think its going to take awhile to start, try this... hold the accelerator down 1/8 of an inch and try starting it. If it starts right up and you let go, does it almost die or does die?
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Old 06-24-2013, 10:26 PM   #18
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Default Interesting discovery today

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Next time you think its going to take awhile to start, try this... hold the accelerator down 1/8 of an inch and try starting it. If it starts right up and you let go, does it almost die or does die?
Just tried that Mike,What was your idea there? no difference as usual, after sitting a while it turns over about a dozen times before firing, I assume it takes that long to build up fuel pressure after leak down, but thanks, we'll get this yet.

My discovery happened when I went in to Advanced auto parts to get some supplies, MAF cleaner, sea foam, air filter. I was telling him about my code , then I asked if he had a code reader and he said yes so I asked if we could double check and compare mine to his. He could find no present codes but found 18 past codes, He had a lot better reader than I but he said try yours again and sure enough mine came up with the 0102 MAF sensor again?? Suppose I need a third opinion? Any way I cleaned the MAF, new filter, Sea foam. Checked for code again after cleaning, still there
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Old 06-24-2013, 10:45 PM   #19
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Could still be that MAF, try unplugging the sensor and running with it unplugged. After a couple key cycles the PCM will ignore the MAF input and go into a "default" by reading other sensors. It will probably take a few ignition cycles to do so.
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Old 06-24-2013, 11:49 PM   #20
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Could still be that MAF, try unplugging the sensor and running with it unplugged. After a couple key cycles the PCM will ignore the MAF input and go into a "default" by reading other sensors. It will probably take a few ignition cycles to do so.
Not sure I understand your reply? What will I accomplish by unplugging it. I have unplugged it briefly and there is noticeable change in engine idle rpm and it runs rough. Thanks
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