my MJ, 89, 4.0 renix.
The intermittent starting problem persists.
have spark, seemingly at the correct time, have fuel.
actually too much fuel...... according to the new spark plugs
i posted some info in the past on another board. and have changed.....
dist cap, rotor
cps
plug wires
plugs autolite platnium replacing bosch platimum
fuel pump
injectors (19lb accel replacements), thought the originals were sticking open
oil and filter (after smelling fuel in oil)
coil and module have about 70k on them
When it does start, it runs fine... with no issues
So here I am again.....
Would not fire yesterday afternoon, but did this morning, but it shows the same signs of rich condition...
got it inside shop, it loaded up and stalled just as I entered shop, pulled #3&4 plugs (easy to get at), soaked with fuel
tried an 'old' coil and module...(oem with 70k) made no difference...
and when i test the spark, i can see no 'issue'
What controls the injector pulse? What could cause the flooding? Do the injectors fire sequentially?
have in the past checked resistance on the cps, seems in spec
what next??
then I posted again.....
Bumfuzzled...
performed some tests on components... cold engine, before attempting a start
this is after a no start condition, leaving it overnight
MAP sensor, voltage checked fine, output voltage will change when applying vacuum to port.. will hold vacuum
intake air sensor and coolant temperature sensor check fine for temperature range vs ohm reading per chart.
i did find the output voltage from the TPS to be low, .38 volts instead of .8 volts, I was able to adjust to .8 volts and have 4.8 volts at WOT. I performed a sweep test and could not detect any problems (no analog meter)
The CPS checked 200 ohms
The coil I have checks in spec on the primary +/- terminals (4-6 ohms) and from the secondary to either of the primary i have 4650 ohms another newer coil checked 6500 ohms
checked the ground strap visually, it seems to have no issues and is tight
i was not able to backprobe the stator to check it
for kicks after the above, i attempted a start......
the damn thing ran...
i ran it for about 6-8 minutes, still smelled a bit rich, and then shut it down.
after about 15 minutes, i tried to re-start......
nope.
same ole crap, smells flooded and 'almost' runs but will not 'catch'
pulled #3 plug, seemed gas soaked
grounded plug and checked for spark.... had what should be ample spark
what next??
The intermittent starting problem persists.
have spark, seemingly at the correct time, have fuel.
actually too much fuel...... according to the new spark plugs
i posted some info in the past on another board. and have changed.....
dist cap, rotor
cps
plug wires
plugs autolite platnium replacing bosch platimum
fuel pump
injectors (19lb accel replacements), thought the originals were sticking open
oil and filter (after smelling fuel in oil)
coil and module have about 70k on them
When it does start, it runs fine... with no issues
So here I am again.....
Would not fire yesterday afternoon, but did this morning, but it shows the same signs of rich condition...
got it inside shop, it loaded up and stalled just as I entered shop, pulled #3&4 plugs (easy to get at), soaked with fuel
tried an 'old' coil and module...(oem with 70k) made no difference...
and when i test the spark, i can see no 'issue'
What controls the injector pulse? What could cause the flooding? Do the injectors fire sequentially?
have in the past checked resistance on the cps, seems in spec
what next??
then I posted again.....
Bumfuzzled...
performed some tests on components... cold engine, before attempting a start
this is after a no start condition, leaving it overnight
MAP sensor, voltage checked fine, output voltage will change when applying vacuum to port.. will hold vacuum
intake air sensor and coolant temperature sensor check fine for temperature range vs ohm reading per chart.
i did find the output voltage from the TPS to be low, .38 volts instead of .8 volts, I was able to adjust to .8 volts and have 4.8 volts at WOT. I performed a sweep test and could not detect any problems (no analog meter)
The CPS checked 200 ohms
The coil I have checks in spec on the primary +/- terminals (4-6 ohms) and from the secondary to either of the primary i have 4650 ohms another newer coil checked 6500 ohms
checked the ground strap visually, it seems to have no issues and is tight
i was not able to backprobe the stator to check it
for kicks after the above, i attempted a start......
the damn thing ran...
i ran it for about 6-8 minutes, still smelled a bit rich, and then shut it down.
after about 15 minutes, i tried to re-start......
nope.
same ole crap, smells flooded and 'almost' runs but will not 'catch'
pulled #3 plug, seemed gas soaked
grounded plug and checked for spark.... had what should be ample spark
what next??