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#1 Old 02-05-2010, 02:17 PM
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P1800 code

My '02 3.5SE is throwing this code (P1800) and I have been expecting a problem of some kind as the car as been struggling with acceleration. Also, this is not turning the check engine light but I found the code when my wife left the gas cap unscrewed in tight and it threw a 0453 code and I saw the P1800 code. I clear both codes but the P1800 came back. Again it is not turning on the check engine light.

My car has about 146,000 miles (stock, no mods) on it and I would assume just replacing the VIAS solenoid would correct this problem but anyone has any advice I would certainly appreciate it. Not really interested in moding it but am I right in assume if the solenoid is not closing it would be constantly open and cause the lost of throttle response?

Brian G.
'95 GXE [Totaled]
'00 GXE [Sold]
'02 SE [Sold]
'10 Xterra S
'14 3.5 S
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#2 Old 02-05-2010, 02:51 PM
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Try unplugging the electrical connectors associated with the solenoid and look for any burns or discoloration then clean em real good with Isopropyl alcohol or CRC electrical contact cleaner. Dont just spay it in and plug it back in, spay the contacts down and wipe them down real good. A paper coffee filter works real good and wont leave lint behind like a Q-tip would. Make sure it is COMPLETELY dry before you plug it back in and start the car up.

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#3 Old 02-05-2010, 04:01 PM
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Thanks for the post WJ. Will try that. For the record I have never even removed the engine's cover to even see the VIAS but I am familair with it from the writeups. I am behind on the maintenance as the vehicle has never given me trouble until lately. I intend on taking care of some badly needed overdue repairs this weekend. (plugs, valve cover leak, etc)

Brian G.
'95 GXE [Totaled]
'00 GXE [Sold]
'02 SE [Sold]
'10 Xterra S
'14 3.5 S
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#4 Old 02-06-2010, 10:27 PM
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Well tried removing and replacing the connector on the VIAS with no change in loss of power after my all day repair today. On the plus side I have a non leaky engine and a set of new spark plugs.

I cleared the code after the repairs and I am expecting it to return in short order. Should I just go on faith that the VIAS solenoid is bad and replace it?

Brian G.
'95 GXE [Totaled]
'00 GXE [Sold]
'02 SE [Sold]
'10 Xterra S
'14 3.5 S
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