Question about 2001 Jeep Cherokee
Greetings john ingall Dec 12, 2016
piggy backers.. old. why not start a fresh post for only your car and not mix up other symptoms.
did play with the CMP or CKP. then cause p1391.
oops...a daisy.... you did it wrong.
Id not attack coil rail until the 1391 is cured, not me.
1: scan it ? post all DTC now.
2: DTCs trouble codes..????
3: is the ASD dropping off line, while running? (a key fact to know)
4: ever get a tune up this decade?????
5: spark gaps correct , to factory spec, and kept here doing repeated service? )
6: Do the scans show the IMMO tripping the ASD off line????
there are 8 reasons for ASD to trip , and cause a stall, all 8 are reported !
there are 50 other reasons for stalls, called misfiring...
the service manual is clear (p035x's)
Peak primary circuit current not achieved with maximum dwell time.
This means that the PCM charged to coil fully
and the current was way too low.
that means it found (out of spec) current.
even zero current,
means coil burned up or the transistors to it.
gee, id have the rail off and check each coil
there are 6 coils, 3 primary and 3 secondary
the SM cover this test, as all do so read it.
it can also be bad connections(wires) to same.
(crude, 5ohm pri, 20k secondary ohms)
OUR 4.0l HAS A RAIL PACK, COIL
WITH 3 COILS inside, and uses wasted spark to fire all 6
and if one coil fails you will loose, 2 cylinders, due to series HV wring, unless 1 wire shorts, but if one opens you loose 2 cylinders.
( Kirchhoff's laws 1; an open in series circuit flows no current, so both spark plugs go dead.
unless rich and super lucky , try using a scan tool
when the engine misfire, or stalls.
and report all errors seen, DTCs, a win/win.
the schematic, see F18 fuse , the coil pack
super simple no? ,yes, but not on PCM end. (Ask)
Posted on Dec 25, 2016
P0353 JEEP - Ignition Coil 3 Circuit
P0351 JEEP - Ignition Coil 1 Circuit
P0352 JEEP - Ignition Coil 2 Circuit
Read more: http://www.autocodes.com/p0352_jeep.html
PCM drivers shorted , new PCM Or you have wiring problem .
The problem with coil on plug ignition systems , all make vehicle . The spark plug gap get's to large and the spark can't jump that gap and fries the coil an feeding high energy spark to the PCM frying the transistor inside . Most of the time i don't say to much but dam dude you replaced all those parts , you like making part stores rich . You could have had it fixed at a qualified repair shop for a lot less . There are videos on youtube on coil on plug ignition system testing
Posted on Dec 12, 2016
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Posted on Jan 02, 2017
Quite possible you have a bad ignition coil. As coil heats up it breaks down and will not return to normal till it cools down. Check for spark the next time this happens. If spark is weak or not there, it warrants testing or replacement.
Posted on Mar 16, 2009
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