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Hello! I was pointed this way recently by a helpful guy at Pick'n'Pull as somewhere I might get some good help with my problem VW.
The car: I inherited a project MkII Golf with a 2.0 ABA swap from a MkIII. It's a bit of a basket case, but the list of major flaws is growing shorter.
It has always had a lack of power after it gets nicely warmed up (goes like hell when it's on its way there, though), but that seemed to be getting worse in recent history. That problem was superceded by a dying clutch and a grinding transmission, however, and I those problems have recently been fixed.
The problem: After the new clutch and transmission the engine developed a stutter or misfire from idle up to about 3000rpm. I thought that an odd thing to develop after messing with the transmission, so I checked all the grounds and electronics that might have been disturbed but the operation. They were all good.
I got an OBD reader to help diagnose, and sure enough it's throwing 00515 (hall sensor open or short to plus) and 01257 (idle speed stabilization valve open or short to ground). The idle speed doesn't seem like a concern since my idle is good enough at 1100rpm or so, but it might be connected to the larger poor running issue.
I pulled the distributor and replaced it with a junkyard piece to see about that hall sensor, and though it didn't throw the code at first it still ran rough, eventually giving up the code again. Without the hall sensor plugged in there is no error code. I'm getting 5v across the outside terminals of the connector, as per spec.
I think either the replacement dizzy also has a bad hall sensor, or there's a wiring problem elsewhere. I'll look into those further, but is there anything else I should be checking in the meantime?
The car: I inherited a project MkII Golf with a 2.0 ABA swap from a MkIII. It's a bit of a basket case, but the list of major flaws is growing shorter.
It has always had a lack of power after it gets nicely warmed up (goes like hell when it's on its way there, though), but that seemed to be getting worse in recent history. That problem was superceded by a dying clutch and a grinding transmission, however, and I those problems have recently been fixed.
The problem: After the new clutch and transmission the engine developed a stutter or misfire from idle up to about 3000rpm. I thought that an odd thing to develop after messing with the transmission, so I checked all the grounds and electronics that might have been disturbed but the operation. They were all good.
I got an OBD reader to help diagnose, and sure enough it's throwing 00515 (hall sensor open or short to plus) and 01257 (idle speed stabilization valve open or short to ground). The idle speed doesn't seem like a concern since my idle is good enough at 1100rpm or so, but it might be connected to the larger poor running issue.
I pulled the distributor and replaced it with a junkyard piece to see about that hall sensor, and though it didn't throw the code at first it still ran rough, eventually giving up the code again. Without the hall sensor plugged in there is no error code. I'm getting 5v across the outside terminals of the connector, as per spec.
I think either the replacement dizzy also has a bad hall sensor, or there's a wiring problem elsewhere. I'll look into those further, but is there anything else I should be checking in the meantime?
If it's smoken it ain't broken
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