Is this a bad CMS or CKS?
Thread Starter
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Joined: Jul 2004
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From: Palm Harbor, FL
Is this a bad CMS or CKS? So my car:
2001 WS6
Cam, headers, dumped exhaust
~90,000 miles
Problems:
takes several cranks to start
intermittent sputtering/popping that seems to improve at higher RPM
Problem is worse under load (AC on, up hill, etc)
My thoughts are that this is either the CMS, CKS, or a fuel pump issue. Anything I can do to narrow this down?
2001 WS6
Cam, headers, dumped exhaust
~90,000 miles
Problems:
takes several cranks to start
intermittent sputtering/popping that seems to improve at higher RPM
Problem is worse under load (AC on, up hill, etc)
My thoughts are that this is either the CMS, CKS, or a fuel pump issue. Anything I can do to narrow this down?
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Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
I have had the cam sensor completely disconnected. Only problem was hard starting and back firing about 1/2 of the time. Once started, it ran perfectly.
Sounds like you might be running very lean due to low fuel pressure.
Sounds like you might be running very lean due to low fuel pressure.
Thread Starter
TECH Fanatic
iTrader: (1)
Joined: Jul 2004
Posts: 1,453
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From: Palm Harbor, FL
For what it's worth, here's how she drove today:
Started on the 2nd crank, Idle is fine (always is), minimal (if any) sputtering while it's warming up, Once warm i get a range from 1-2 pops to 3-5 seconds of sputtering while driving at low RPM (between 1,000 and 1,500) that is almost never a problem over about 1500 to 2000 rpm.
Is there a way to verify that the fuel pump is the problem? I would prefer not to cut a window in the trunk and dropping the tank is going to be a huge pain in the ***.
Started on the 2nd crank, Idle is fine (always is), minimal (if any) sputtering while it's warming up, Once warm i get a range from 1-2 pops to 3-5 seconds of sputtering while driving at low RPM (between 1,000 and 1,500) that is almost never a problem over about 1500 to 2000 rpm.
Is there a way to verify that the fuel pump is the problem? I would prefer not to cut a window in the trunk and dropping the tank is going to be a huge pain in the ***.
