Question about Jeep Grand Cherokee

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Was driving on freeway and my 93 jgc motor just died and i rolled to a stop fuel pump is new and working replaced crank sensor, cam sensor, map sensor, tps, coil, plugs, wires, cap, rotar, ign switch, coolant temp sensor and i have 2 pcm's that work and both flash error codes 12 and 14 i am stumped and angry please help me !!!! ps alarm is bypassed it is grounded out inside drivers side door

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I found DTC 12 indicates battery input to the Powertrain Control Module (PCM) was disconnected during the last 50 key starts.
(you possibly had unhooked the battery at some point?)

I found DTC 14 for vehicle OBD1 to be >>
14 - MAP Voltage Too Low Or Too High
check 1st (have it tested if possible)
or replace... MAP sensor from junkyard, eBay, auto parts store..

I'm not an expert, just tryin to help from 30 years experience and Google, etc..

Posted on Sep 30, 2010

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Have u pulled a compression test what make and model

Posted on Sep 30, 2010

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2 Answers

What stops a fuel pump from working ,on a grand am se v-p6 3.4 motor ? I did'nt let it warm up the other mournin g , got down the road and it shut off driving.


A fuel pump does not need to be warmed up to work. They just wear out. If its the fuel pump that's the problem it will have to be replaced.

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Driving car on freeway heard a ping car dies out. Car wont turn over. Changed gas fuel in in gas tank, still wont turn over, changed the crank shaft sensor and still wont turn over but the is getting gas...


turn over or run
turning over is cranking but not starting/running
not turning over indicates seized motor , bad battery starter motor problems , bad ground
turning over is cranking but not starting ---broken timing belt/chain, crank/cam position sensors , no fuel , no spark , no injector operation
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Engine dies


if it shuts off while driving down the road. and restarts after 10 minutes, its usually a bad crank sensor that does this. it messes up timing and shuts off fuel supply.

Apr 05, 2014 | 1994 Chevrolet Suburban

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My car isn't starting correctly; i turn the key, it cranks, but i have to hit the gas at the right time for it to turn and stay on. after that, it drives normally. i got the control module ignitor...


BAD FUEL PUMP CHECK FOR FUEL PRESSURE WHEN ENGINE DIES AGAIN,IF YOU GET ZERO FUEL PRESSURE FUEL PUMP COULD BE BAD, I WOULD REPLACE FUEL PUMP RELAY FIRST BEFORE BUYING NEW FUEL PUMP.IF FUEL OKAY YOU COULD HAVE CLOGGED FUEL INJECTORS OR WATER IN FUEL, FUEL COULD BE CONTAMINATED. I HAVE SEEN A FAULTY ENGINE COOLANT TEMPERATURE SENSOR CAUSE ENGINE TO STALL OUT.

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When driving down the road my 1999 300 m will die out and not stard right away. some times it will die when driving down the road it will die and then start back up. we have replaced the cam sensor...


Was the cam sensor tested & was it found to be bad?

Was the fuel pump checked out or fuel pressure checked?

Always learn how things work & how to test them

Replace nothing until something fails

No guessing at all,diagnostic testing, if you like
that langauge

Failed Fuel Pump--my guess

Aug 03, 2011 | 1999 Chrysler 300M

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REPLACED FUEL PUMP UNIT CRANKS TAKES ABOUT 10


upper 02 sensor run on a loop till the engine gets warm then it reads the sensor get you back on the road fast it will work better if the engine is warm when you take out the o2 sensor

May 04, 2010 | 2001 Dodge Durango

1 Answer

93 jeep cherokee 4.0 dies when stopping but idle till fuel gone


GREAT INFORMATION...

however, you were not clear about fuel pressure

was fuel pressure OK before and during the concern...30psi and have you check flow

PLUS...during the concern are you loosing SPARK? Coil is great suspect!

while the code for the crank sensor concerns me I'd start with the most common Jeep concern...the ASD (auto shut down realy)

when you start testing again remember to check the CKP output at the sensor and the CKP input at the computer...you might have a CKP circuit that is worn out







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2 Answers

1993 s10 4.3 starts fine, while idling it dies. sometimes i have a hard time restarting. the blazer died a couple of times while driving.fuel pump is good, tuned up, remanuf. injectors 1 yr ago,engine lite...


only half way there if you have a tbi check the crank sensor/ cam sensor that is the first line of business on that truck if the crankshaft sensor fails the truck stops dead when you wait a few minutes the sensor re energizes and the truck will work again for a bit antiknock can cause similer problems but not while the truck is running

Feb 24, 2010 | 1993 Chevrolet S-10 Blazer

1 Answer

NO SPARK!


The crank and or the cam sensor has failed. If you have no way of pulling codes or checking for signals from the sensors, start with the crank sensor, its more common.

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