1995 Jeep Wrangler 4.0L.. It has OBD 1... check engine light is not on but there is a code stored in the ECU aquired by 3 key turns... The code is 55... What is this?
Yes, it means that your vehicle diagnostics says the vehicle has no problems.Yes, it means that your vehicle diagnostics says the vehicle has no problems.
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No software upgrade will fix that bad ecu. There are electronic components inside the ecu that need to be replaced. Services for repair or replacement of your ecu are available on ebay.
Your ecu is in need of repair. Your jeep has what is known as the "delayed check engine light problem". Time has taken it's toll on some of your ecu's internal components, the ones that supply power the fuel and ignition circuit relays. The ecu is slow to supply power to the circuits in the morning, causing the delay. Your jeep may also have a bad crank sensor, which would cause the sudden shutdown while driving. Your ecu can be repaired or replaced, your choice. Both options are available on ebay.
there is a static timing setting from which the ECM advances or retards the spark according to sensor reports and rpms
using a timing light connected to no 1 cylinder set the mark on the pulley to 10 degrees btdc and that will allow the timing to work properly
if there is no scale on the timing cover and a small slot th the pulley flange
do this
remove no 1 plug and get no 1 piston coming up on compression
using a piece of copper wire in the plug hole determine when the piston is at TDC by seeing the wire moves up or down as you move the crank either way
place a white paint line at a convenient place on the cover and on the pulley edge
now move the pulley back ( anticlockwise ) about 3/4 of an inch and put a second mark on the timing cover
That second mark will be close to 10 degrees and will be within the parameters for the ECM to adjust the timing when running
using the timing light again turn the body of the distributor until the pulley mark lines up with the second mark you made and clamp it up at that point
When you're trying to start it for the first time of the day, look at the dash to see if the check engine light is on when you first turn on the ignition. If the check engine light is not lit up, your Jeep ecu is in need of repair and the vehicle will not start until that check engine light finally comes on.
Could be one of several items...I'd check the fuel pump relay, auto shutdown relay and the ignition switch itself. I'd bet on it being one of those relays but, we all have been fooled at least once!!! I'd also make sure that body and engine grounding is good and clean. Relays can't work properly without a good ground.
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