Question about 2003 Jeep Grand Cherokee
Fuel volume regulator control circuit stays open. where is it and how do I fix it. I PUT IN A NEW FUEL PUMP, FILTER/REGULATER, FUEL RELAY SWITCH, THROTTLE POSITION SENSOR ALREADY. wHEN I DEPRESS THE GAS IT REVS UP BUT THEN STARTS TO DIE WHETHER PARKED OR IN GEAR. THE VEHILCE SHAKES AND THE ENGINE LIGHT FLASHS
P0001, ???????? NO SUCH ANI-MULE ! (sure on a CHEVY)
the FSM covers that..... why not post engine options, after all its and engine problem , we can not guess that.ever.
my FSM shows, no such code, nada
ever do the 60k mile mandatory tune up, ever this decade?????????
are you at Autozoned? using the wrong scan tool for car?
what a shame, that would be chasing Ghosts with no name.... wow.
did you do the 3 keyon ways, to get this (ask), why not say who did this
how and what tool used (name and model number ) so we can add it
to our jeep banned tools list. (love to have it)
i use INNOVA 3160, and it works.
ok working symptoms now."
that is gross misfire,and the CEL flashing warns of impending CAT burn up (oper guide tells that..... and what to do)
MISFIRE HAS 25 to 50 causes, are you going to replace 50 parts to guess the cause..... nah. sure not.
want to diagnose it? and save 50 hours labor.?
and $2000 in parts. , sure..
i have the list of 50 but will not post it, as is silly to do that.
it is 1 of 3 things in the macro diagnostic methods.
bad engine, bad spark, bad fueling , in that order, always.
1: check all fuses first with a voltmeter or ohms .
2: get a real scan tool that the harbor fright POS and scan it running
bad. bingo, real codes. including the full factory codes, P1 or P2 !
you can in fact, rent obd2 tools and barrow them. at a many stores,(USA) and many honest mechancis will use there REAL tool
to scan it, for you for free. or for cheap.
there is no reason ever to skip #2, ever, in the USA, we have the tools.
3: NO CODES? NO '? id get not but lets pretend no codes.
4: check spark. at all cylinders, fat blue white spark at a fresh test spark plug.(ill assume engine is tuned up, so...)
are any spark plug tips, black, or oil soaked or fuel soaked? or looking ugly (this is a top evidence check)
5: spark good, engine compression at 150psi or more times num of cylinders. yea.? then its bad fueling.
6: I start engine, and see the front oxy sensors slammed to lean.
yes, scan tool wins again, and LTFT fuel trim, is way off, scale.
7: I check fuel pressure and its way too high. fix that.
8: i check the regulation of the fuel pressure, if bad, the reg is bad.
9: I then do the injector leak down test in the FSM (allcars)
it fails. i have a leaking injector. (or leaking reg)
say it passes. so i do the fSM (all cars, all engine books EFI) test called
the Injector balance test. i find #1 is very weak. its clogged and #1 misfires like a dog, cause the 02 sensor to go nuts.
I can show videos of all tests. the man that does that best is
Mr. Duane. ask..........??????
he is and ASE master... and does the best vids on the web.
here are some. just a sample.
not knowing the engine, type and size, i can not quote specs.
Posted on Mar 29, 2014
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Posted on Jan 02, 2017
When I first posted, I did not read "comments" after reading what you have done and our results, it seems as though the engine control system "thinks" the engine is running when it is not. I don't believe this is a key switch problem, otherwise if you turned the key to "on" it would flood the engine. Therefore there is a strong possibility that the engine control unit is staying "hot" even when shut down, permitting the pump relay &injectors to receive trigger signals .BUT, I would also take a look at the pressure regulator on the fuel rail. flow through there may be causing the pump to stay on if too much fuel is being bypassed. And, again...did you check codes???
Posted on Feb 16, 2009
Testimonial: "Thank you again for ALL your help. Without you and Fix-Ya we probably would have junked a perfectly good vehicle."
1st you said it yourself in comment,no fuel pressure.......!no fuel no start!even if pump is running doesnt mean its good,check fuel filter may be badly block,and what youre looking for is the idle air control valve aka iac sensor,get fuel going to motor first!
Posted on Mar 07, 2009
Between 100-140 thousand miles the fuel pumps go out on the 1993 cherokee. Its a fact. All parts are manufactured with the knowledge that it will last for a specific period of time then it dies. The relay switch was helpful for a brief while because there was still some juice in that pump, but now that it is gone it is gone.
If you don't see the fuse box under the dash in the driver leg area or beneath the radio check for a covered box under the hood. There should be a fuse spec guide on the lid of the box that tells you where specific wattage should go and for what purpose. But, your fuel pump problem will not be solved by a new fuse.
Posted on May 25, 2009
i've tried all the above solutions and still experiencing the same problem. in doing some research it may be an electrical problem, the bolts holding the firewall may be grounding it before it should be and with expansion and contraction of metal in different weather conditions may help explain why it doesn't happen all the time. try messing with that
Posted on Jul 10, 2009
SOURCE: 2000 Jeep Grand cherokee Laredo
sounds alot the the pcm it controls the fuel pump and ign system but the anti theft would keep it from starting because the key has a transponder in it programmed for that vehicle and that would kill all ign if triggered
Posted on Sep 27, 2009
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