inthevalley
New Member
- Joined
- Mar 28, 2019
- Messages
- 9
- Reaction score
- 0
- Points
- 1
- Location
- Arizona
- Vehicle Year
- 2001
- Make / Model
- Ford Ranger 4.0
- Transmission
- Automatic
I put the battery on a charger for a few days and got some better leads for my multimeter.
With the key off battery voltage is 12.3 or so. With the key on it drops to 12.16. At the power wire to the ignition coil plug it is 12.08.
I measured resistance between the red-green wire by the ignition coil plug and and the red-green wire right outside the ECM (i hope they are the same wire...) and got a huge amount of resistance: 600 at the 2000 ohm setting. Seems like either that wire is damaged or I was testing it wrong. Voltage between battery and that location was still 12.08 volts...
Also, spark plug test light showed no spark at all on the one cylinder I tested
However, when I hooked up my scan tool and tried to rev the engine again I noticed that, although cranking, the tach did not move at all in either the truck dash or my scantool app: 0 RPM.
The result was the same when I tried jumping it. When I started this project I remember getting a couple hundred RPM so this has me confused.
Maybe I have a totally bad battery? 12.3 seems low, my other vehicle was 12.6 with key off.
Once again, I really appreciate all the help!
With the key off battery voltage is 12.3 or so. With the key on it drops to 12.16. At the power wire to the ignition coil plug it is 12.08.
I measured resistance between the red-green wire by the ignition coil plug and and the red-green wire right outside the ECM (i hope they are the same wire...) and got a huge amount of resistance: 600 at the 2000 ohm setting. Seems like either that wire is damaged or I was testing it wrong. Voltage between battery and that location was still 12.08 volts...
Also, spark plug test light showed no spark at all on the one cylinder I tested
However, when I hooked up my scan tool and tried to rev the engine again I noticed that, although cranking, the tach did not move at all in either the truck dash or my scantool app: 0 RPM.
The result was the same when I tried jumping it. When I started this project I remember getting a couple hundred RPM so this has me confused.
Maybe I have a totally bad battery? 12.3 seems low, my other vehicle was 12.6 with key off.
Once again, I really appreciate all the help!