3.0 01 automatic miss fire????
Only 1991 - 1994 3.0l Rangers had distributors, you say "3.0 01 automatic" in title, 2001?
If you have the older 3.0l then you could have worn bushing in distributor that causes a wobble at high RPMs so you get misfires.
Also could be a problem with NSS(neutral safety switch) on the A4LD transmission.
Shift pattern is P R N D 2 1, so N and D are next to each other
Engine computers have a REV limiter, when automatic is in P or N the computer will limit maximum RPMs, usually set at about 3,000rpm
If NSS is telling computer you are in N when you are in D then you could be getting limited RPMs, that would explain why you can go above 4k when you shift out of D to 1st, NSS now tells computer you are "in gear"
Test for this would be to shift transmission to D before starting the engine.
NSS only allows starter motor to work in P and N
With FOOT HARD ON THE BRAKE, try to start engine in D, if it cranks then computer does think its in Neutral when its in Drive
If you have the older 3.0l then you could have worn bushing in distributor that causes a wobble at high RPMs so you get misfires.
Also could be a problem with NSS(neutral safety switch) on the A4LD transmission.
Shift pattern is P R N D 2 1, so N and D are next to each other
Engine computers have a REV limiter, when automatic is in P or N the computer will limit maximum RPMs, usually set at about 3,000rpm
If NSS is telling computer you are in N when you are in D then you could be getting limited RPMs, that would explain why you can go above 4k when you shift out of D to 1st, NSS now tells computer you are "in gear"
Test for this would be to shift transmission to D before starting the engine.
NSS only allows starter motor to work in P and N
With FOOT HARD ON THE BRAKE, try to start engine in D, if it cranks then computer does think its in Neutral when its in Drive
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From: Delmar
Only 1991 - 1994 3.0l Rangers had distributors, you say "3.0 01 automatic" in title, 2001?
If you have the older 3.0l then you could have worn bushing in distributor that causes a wobble at high RPMs so you get misfires.
Also could be a problem with NSS(neutral safety switch) on the A4LD transmission.
Shift pattern is P R N D 2 1, so N and D are next to each other
Engine computers have a REV limiter, when automatic is in P or N the computer will limit maximum RPMs, usually set at about 3,000rpm
If NSS is telling computer you are in N when you are in D then you could be getting limited RPMs, that would explain why you can go above 4k when you shift out of D to 1st, NSS now tells computer you are "in gear"
Test for this would be to shift transmission to D before starting the engine.
NSS only allows starter motor to work in P and N
With FOOT HARD ON THE BRAKE, try to start engine in D, if it cranks then computer does think its in Neutral when its in Drive
If you have the older 3.0l then you could have worn bushing in distributor that causes a wobble at high RPMs so you get misfires.
Also could be a problem with NSS(neutral safety switch) on the A4LD transmission.
Shift pattern is P R N D 2 1, so N and D are next to each other
Engine computers have a REV limiter, when automatic is in P or N the computer will limit maximum RPMs, usually set at about 3,000rpm
If NSS is telling computer you are in N when you are in D then you could be getting limited RPMs, that would explain why you can go above 4k when you shift out of D to 1st, NSS now tells computer you are "in gear"
Test for this would be to shift transmission to D before starting the engine.
NSS only allows starter motor to work in P and N
With FOOT HARD ON THE BRAKE, try to start engine in D, if it cranks then computer does think its in Neutral when its in Drive
I would start with replacing coil pack, mind the firing order on the coil pack, one side is 1, 2, 3, other side is 5, 6, 4, so out of numerical order
When engine is under load spark has to be strong because of the higher pressure inside the cylinder, with no load(i.e. Neutral) weak spark is fine to get higher RPMs.
Just guessing based on your available info
Fuel demand also changes based on load, at 6,000rpm in neutral fuel demand is not that much, so it could be you are "running out of gas" when engine is under load
New fuel filter is about $10, if you don't know when it was last changed I would change it, should be changed every 5 years or so
When engine is under load spark has to be strong because of the higher pressure inside the cylinder, with no load(i.e. Neutral) weak spark is fine to get higher RPMs.
Just guessing based on your available info
Fuel demand also changes based on load, at 6,000rpm in neutral fuel demand is not that much, so it could be you are "running out of gas" when engine is under load
New fuel filter is about $10, if you don't know when it was last changed I would change it, should be changed every 5 years or so
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sam0330
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Dec 21, 2009 03:31 PM
