Thread: Sputtering
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Old 07-03-2008, 02:30 PM
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gsxr gsxr is offline
Join Date: Aug 2001
Location: USA
Posts: 8,021
I'll wager that it's a stretched timing chain, which is also retarding the injection pump timing. The pump timing advances with RPM, which would explain why it smooths out at 2000rpm or so. The early 90's 60x engines had a rash of bad chains... mine was about 8 stretched when I got it at 155kmi. Check the chain first (instructions are here - you need to pull the valve cover and fan+clutch), replace if stretched past the spec in that PDF doc.

The new chain will change IP timing so adjust IP timing afterwards. If the chain is within spec, then check IP timing, set to 14 ATDC. Pretty likely this will cure the problem. It also might not be a bad idea to tweak the ALDA a bit, assuming you have the square (not round) ALDA, if you have never done so.

Dave M.
Boise, ID

1997 E420 - 155kmi (Bugeyes)
1994 E420 - 145kmi (Blondie)
1993 500E - 193kmi (Lollipop)
1992 400E - 189kmi (Stinky Dirty)
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