Question about 1995 Jeep Grand Cherokee

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1998 jeep grand cherokee will not turn over but fuel pump is fine

Tries to start and sounds like it will but won't.

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  • Jeep Master
  • 20,706 Answers

Fine? ( 30 to 40PSI , fine, not squirt tests or sounds)

EFI demands full pressure all the time, its not like carb cars of old.

first off, no engine stated ,so all help will be poor, all cars have engine options.. to work on any car , open hood, (USA commenter) and look up see that EPA sticker there, and the engine ID< and displacement?



That is first. (ill pretend , you drove to my shop and what id do)

i ask owner, when\'s the last time car was a daily driver?, last week or last decade>? (bad fuel, etc,....happens)



i stick finger in air, its 50F, not -40F air temp, ok not in Canada. cool. er its hot...

i open hood and see a I6 4.0L engine, with EFI. ok.



2: i check all the fuses. it\'s EFI and blown fuses, will kill the show.

3: i turn the key , and check engine lamp glows, (ECU is happy)

(ecu has juice , so boots and glows CEL, to say so)



4: i crank it, it cranks over 250 RPM, sounds like normal fast cranking

we all know that sound, we dont use the tachometer...



5: i then ask owner , evah\' tune it up this decade, answer no.

SSDD !

i then do the tune up, plugs were ratty. all spark parts, filters.

we dont use $100/hr labor to find ratty spark parts the install them

its called a tune up.



car runs like new. (end story) no?

or it was tuned up;.

so, i check spark it is blue-white on my test spark plug (new) times 6.

i then check spark timing, it\'s dead on, good, if off i fix that first.



if timing is off on most cars i check compression as some like

to slip cam timing. (i saw a V6 once with plastic timing gears. once burned ,twice shy , i check it all) (i do a compression test on all old motors. so I can see TRUTH, and potential future LIFE of engine)



ok, spark is perfect,please note my order, good motor?, good spark?

with bad motors and spark the fuel can not burn, not fully.



then, i try "test fuel" (can-o-spray) car runs for 3 seconds. and stalls.



my gosh, the motor and spark were good. verrroooooom stall....



(btw, this here, logic flow is bad on DOHC motors, 99% true) ask



i check spark plug tips and they are dry. (wet is flooding)

DRY !

i suspect low or no fuel pressure, i know from experience

that fuel pumps about 75% do not run only key on, only cranking

and running they run. so i check pressure.



i find its 10psi.

the story gets longer for flooding or injectors tests, ill skip that.. ask.

so 10psi,. i find

1: 12v to pump is really just 6v, if fix bad connector up stream from pump. done.

2: if 12v to pump cranking, mine was 11v, but the starter does that. drop so is ok. (study starting systems) , its good line voltage is good. cranking.



3: i then check the fuel pressure reg, and find the thing stuck wide open , i replace the reg. and pressure is 34 PSI (wild guess. didnt look yours up. ) car runs prefect now.

or

4: i find FPreg ok, but pump is weak, new pump saves day..

i have a scope and can see this pump is noisy, has a bad commutator segment, deep inside it... scopes, rule.

all above is good?

if pump pressure is at spec. cranking, then

do this long story, omitted due to fingers sore.

ask

the pump tests and spec are all covered 100% in a real FSM.

the spec is covered at alldata.com, log in and see it.

btw, all EFI just hates low fuel pressure.

the whole system is turned for good pressure,

and many systems do not even monitor it.

To understand that read the books by, Greg Banish



http://www.amazon.com/Engine-Management-Advanced-Greg-Banish/dp/1932494421/ref=sr_1_1?ie=UTF8&qid=1388070570&sr=8-1&keywords=greg+banish.



the pressure must be at spec, and must regulate perfectly

or the ECU fuel tables are all TRASH.



hard starts. (fast starter) nut shell.

1: bad fuel. or running summer fuel in winter

what is your air temp, not stated, and is big factor ,if very cold.

2; no tuneups. ever done.

3: bad spark or timing off,

4: low compression.

5: bad ISC, try starting with 10% throttle ,to mimic a good ISC.

6: flooding. soaking wet spark tips.

7: under fueling, dry sparks.



try test fuel. if dry.

Posted on Dec 28, 2013

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SOURCE: 1995 jeep grand cherokee wont start

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I had a similar problem with a Ford Excursion, it turned out to be intake manifold gaskets. It would stall then start right up again, it ran fine during warm up. But, once fully warmed up it would stall at stop lights and stuff like that. I did get a check engine light, the code was lean condition. I don't know on a Jeep, sorry I can't be of more help.

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