Question about 2002 Jeep Grand Cherokee

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3 1 v6 no spark

The spark is weak and I just find out the Franco sensor is not functioning because even when the sensor is disconnected the spark still come but weak.

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Kia ora Binghi , sorry for the delay man , i did not solve my p0161 02 oxygen sensor as yet but am looking for some help , best of luck man with your repair .colin reihana

Posted on Mar 30, 2014

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06 GC
v6,weak spark 3.7L V6 , WEAK ON ALL 6 SPARK PLUGS?
franco (even google cant guess this.... )
pulling sensors proves nothing.
did you use a SCAN tool yet, that be first, and do it 5seconds cranking
and see those DTC pop?
getting P03xx codes, cranking? huh? any scan tool works... rent one.
weak spark is weak battery, in most cases. on all 6 plugs.
your v6 has cops, coil (ignition) over plugs, COPS.
it has 6 COP, all 6 must work or running will be hard.
check all 6 for spark with a new test spark plug at the end. gapped right. (ground the spark shell and keep hands away)
now crank, all 6 work>? these COP are very hot. the make nice
fat blue white spark , with a charged battery.

lets run the list.
did you check all fuses in both boxes from blown(using ohm or volt meter)>>>?? 0 ohms is good, infinity is bad, some look good but are in FACT bad.
is battery charged to 12.6vdc rested???????
are the head lights full bright turned on??????
Due all dash cluster warning lamps come on , for the self test, all jeeps do, key on?? and for sure the CEL lamp?
Do you have an Immobilizer? option? on car. if yes?, does the IMMO lamp go out, before you crank, (if not it will kill spark and fuel)
for sure. see IMMO here.
http://www.fixkick.com/Jeeps/SKIM.html

now how does (ASD) really work?
the first test is to be sure the ASD relay stays closed for the full time
cranking. if it drops out in 2seconds, then that is ASD drop out.
http://www.fixkick.com/Jeeps/ASD.html

It is tricky , if the PCM sees weak spark , it will drop out.
so check spark carefully during that 2 second event (yes, painful)
yes, takes 2 persons to do this.

check spark timing, to make sure the cam chain did not fail.
ill stop here, it only takes 3 things to run.
good engine (compression and vacuum good)
good spark (all 6 COPS, and timed right)
good fueling. (lots more tests, i stop here.)

Posted on Mar 28, 2014

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1 Answer

Jeep grand cherokee crankshaft position sensor replaced but still given a weak spark


the coil. ? older post.
the PCM reports even one drop out of 10 , on the CKP or CMP sensors. 99.9% of these changed are good.
why not tell me what you have,? full symptoms and evidence.
got P030x misfiring? are you even using a scan tool,? or working blind.
may be its the coil.?
can can you feel the misfiring.c
can you see the engine shake? all of this is evidence.
do not miss out on that.
does the scan too shop pending misfire codes?
stored codes, or codes while driving, learn to use the scan tool.
do a 60k mile tune up yet?
your engine is not COP coils like the V8
its COIL rail that is a COIL pack with 3 coils inside
that runs 2 sparks each called WASTED park.
so did you try new sparkplugs(dah)first then new coil pack wires HV
next , then a new coil pack last.
start with the cheap spark plug and wires, (called a tuneup)
then pop for coil pack./
misfire can be clogged or leaking injectors too, and that ill skip
with out you using the scan tool fully.

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Bad or fouled spark plugs, could be caused by bad gas.
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1 Answer

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2000 Ford Taurus V6-3.0L DOHC VIN S
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INSTALLATION
1. To install, reverse it removal procedure
1. To install, reverse the removal procedure.

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