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2000 Jeep Grand Cherokee - Page 11 Questions & Answers
2000 jeep grand cherokee 4.7 has a no crank no start on cold mornings
DOES IT CRANK in NEUTRAL? using fresh PRNDL contacts?
no crank, is easy to diagnose. with just one tool a voltmeter.
12.6vdc is a charged battery , rested, if lower, and not cold its discharged. so charge it or jumper cable crank engine off running donor car. easy huh?
if it cant crank it cant start, (mine can push start or gravity start)
battery cable lugs clean and tight x4 ends? green corrosion?
we then hot wire. the starter solenoid, next. (using old screwdriver as jumper bar)
it cranks now (good starter ) all in 5min work !
it does not crank bad starter.
so it cranks hot wired. good.
so next what is next, easy the KEY line.
the key line runs form the starter to the PRNDL switch and then the KEY switch (crank Start line)
if the car has SKIM immobilizer it cuts fuel not spark.
so i check for 12vdc into PRNDL cranking then key is ok.
if got 12vdc in to PRNLD but not out cranking the switch is bad.
or maladjusted?
its that simple ,with any 10buck DMM off walfarts shelf.
if car is hacked or alarms spliced in, we cant fix it here, its not stock.
same with remote start hack jobs.
Getting no spark
which engine? of the 3.
all sparks failing or just one, takes them all to run !
generic answer, starts.
check fuses first. aways.
spark, lost spark on all modern cars
you next scan the PCM using any scan tool (modern)
youj crank the engine over for 5 seconds, and you will see
DTC errors. , and the error is a BIG clue.
like DTC for dead Crank sensor, or? cam?
Why has my a/c stopped blowing
Could be a blown fuse or a problem with the blower motor or resistor/controller, but on the AZC (automatic zone control) system, many times the problem is a melted connector on the blower motor controller. Look up in the passengers footwell area, there you will find the blower motor (fastened with three screws) and next to it the blower motor controller..
Won't idle
I would check the IAC stepper motor plunjer (idle air control). Dirt can build up on the plunjer and the air canal and will disturbe the idle control. The IAC sits on the throttle body.
I have recently had to change my radiator in a
Broken radiators are never normal. If you keep breaking radiators, I would be checking for something else wrong with the vehicle causing the radiator to break. (Improper antifreeze mixture, too much vibration from damaged/missing radiator mounts, etc.)
Is there a wrong way to put the thermostat in?
Yes. the spring side must be facing the engine. sometimes there is a small breather hole as well. this usually is pointing to the back of the engine. Pay attention to how the old one is in there when you disassemble. put the new one in the same way.
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