'98 Codes Thrown/Evap Can/Fuel Leak - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-01-2010, 05:19 PM   #1
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Post '98 Codes Thrown/Evap Can/Fuel Leak

Well I borrowed a code reader today and tested my new 98 SE. First I got a 440 which is the EVAP system fault. I will check into that a little later.

I also got a 301 - cylinder 1 misfire.
The engine does hesitate to start a little, so I went in and took off the first spark plug wire to test it and found rust on the coil (I think that'* the right name for it... I just got home from college and my brain hurts ). All of the spark plug wires appear brand new, so I'm assuming they've already been replaced. I'm probably going to have to replace the coil though, correct? If so, could I head over to the salvage yard and find one that works, or am I better off buying a new one?

Also, as a side note for those who were asking... I noticed that the date on my UIM says it was manufactured in 2003. My car is a 98, so it must have failed and been replaced before I bought it. I'm still going to take off the TB anyways just to see what it looks like in there.
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Old 02-01-2010, 05:56 PM   #2
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The EVAP code could be a vacuum leak, those lines are brittle. Or could be the purge valve, both are easy to fix.

Test the coil to see if it'* bad, you might only need to clean the post.
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Old 02-01-2010, 06:26 PM   #3
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Doesn't hurt to take a peek!!

I wouldn't judge the wires just by looks. Only takes a few seconds to test each wire with a multi-meter.
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Old 02-01-2010, 06:26 PM   #4
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Quote:
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The EVAP code could be a vacuum leak, those lines are brittle. Or could be the purge valve, both are easy to fix.

Test the coil to see if it'* bad, you might only need to clean the post.
I just tested the coil, it'* fine. I used a wire brush to clean it off a little. I tested the #1 spark plug wire, or tried to... i couldn't get a reading from it. The rest of the wires tested good. Does that mean the wire is bad? And what would cause just one wire to go bad like that?
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Old 02-01-2010, 06:29 PM   #5
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If you got no reading it'* bad. Wires can brake. Be sure to put a dab of dielectric grease on the posts, that will prevent any future corrosion.
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Old 02-02-2010, 11:15 AM   #6
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Also, as a side note for those who were asking... I noticed that the date on my UIM says it was manufactured in 2003. My car is a 98, so it must have failed and been replaced before I bought it. I'm still going to take off the TB anyways just to see what it looks like in there.

Make sure you check it. Mine was stamped with a 2005 date code on my 98, so I knew it was done before i got it....well guess what? Yesterday the EGR tube finally melted the UIM enough and dumped a ton of coolant into the intake, thankfully I seemed to have gotten it shut down in time to avoid any damage. My 2005 intake lasted approx 100k.
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Old 02-02-2010, 05:22 PM   #7
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I got a new spark plug wire and I think I fixed that problem.

However, when I start the car I get a strong smell of fuel inside the car and in the engine bay. I found a wet spot on a fuel line behind the UIM, and I think I have a leak there. If I touch it at all, more fuel comes out. I decided to leave it alone until I asked about it.

What is this connector thing, and what do I do to stop the leaking? Is there any chance that this is the source of my 440 code?

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Old 02-02-2010, 05:29 PM   #8
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Pull the fuel pump fuse and crank, that will remove the fuel pressure. Then recheck the connections. You do not want any fuel leaks, that'* a fire waiting to happen.
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Old 02-03-2010, 05:30 PM   #9
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Here'* the EVAP can. All vacuum lines are good. I found some liquid fuel at the connection coming from the gas tank. I'm told there is a filter inside the canister that may be clogged, but I can't figure out how to get at it. Any ideas?

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I inspected the gas cap area closer today and it looks as though the plastic ring/cuff that the gas cap makes contact with is broken. Is this easily repairable?

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Old 02-06-2010, 02:08 PM   #10
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I will need to replace my whole filler neck. I think it is the main cause of my EVAP problem.

I'm planning on looking at the junk yard for a replacement. My dad suggested using one of the older style "screw-in" filler necks, like I had in my '95. Would his idea work or should I get the same kind of filler neck I have now?
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