Question about Jeep Grand Cherokee

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I have a 1994 jeep grand cherolee it takes a while idle after several starts and once it starts it idles good but once you on the road and stop it doesnt want to accelerate right away and once you park it wont start again, have new crank sensor, sparkplugs, wireset, distributo all new what can be wrong?

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We cant help at all , until you disclose the engine option.
what engine, of the many?
ZJ car./

generic answer.
1: check all fuses.
2: do the skipped ? 60k mile tune up now.
3: if engines has EGR clean it , now the main valve must not stick.
4: clean the ISC valve.

for you:
did you for get filters at the 60k tune?

so it wont start ,so do you have spark at all 6 or more spark plugs.?
that be First., (the PCM cuts fuel if spark is lost) so........
when it fails to start we check for spark and also
connect the Diagnostic jumper, and see the CEL flash
and see if we get DTC errors cranking. (5 sec. crank minimum)
if you get these errors, BINGO, no more wasted money replacing senors. the PCM reports a bad CKP sensor fast.

see ZJ here.

also watch the ASD relay ,
does it close at key on and stay closed for 2 seconds.
and if you key on and crank fast, does the ASD stay closed
for full cranking duration?
yes, good
no, the PCM sees errors and drops the ASD by DESIGN. (fire safety)
learn how your ASD works.,

did you replace the whole distributor and not read the FSM
on HOW TO DO IT? oops..... now its 2 times busted.

Posted on Feb 13, 2014

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Posted on Jan 02, 2017

SOURCE: 4.9 liter will idle but wont accelerate have to start with ether

yes checked fuel pressure and replaced the fuel filter, checked the mapp sensor,tested throttle position sensor, has strong spark, 50psi fuel pressure, fresh tune up, runs real rich and rough idle but wont rev up like fuel injectors arent speeding up, also checked exhaust. thanks julius

Posted on Oct 10, 2008

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SOURCE: bogs when accelerating from an idle, rough starts.

listen for a vaccum leak.also try disconecting bat for 5 min the reconnect and start truck and hold idle at 1500-2000 for 5 min. this resets and teaches computer to self adjust

Posted on Nov 16, 2008

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SOURCE: Low idle, stalling frequently

Hi, Check all vacume hoses and fittings make sure there are no vacume leaks also make sure ignition timing is correct.

Posted on Dec 01, 2008

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SOURCE: High idle in a 2004 Grand Am

Yes, the sensor is the first thing you should replace.

Posted on May 08, 2009

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SOURCE: 97 grand prix gtp starts then immediatly dies

If you have a GTP these engines use a hi output fuel pump. they use a fuel pump resistor located under the battery tray (look up from under the car) This resistor lowers the voltage to the fuel fump when not in boost mode. because of its locatoin it is prone to corrosion. if you bypass the wires and the engine starts and stays running replace the resistor

Posted on May 16, 2009

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For the heater you may just be low on fluid in the radiator. Your thermostat may also be stuck open.

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1 Answer

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Most low idle speed problems on these engines are due to a faulty idle air control valve but since you state the idle will go up and return to idle then i would say it is working properly i think you have a throttle body coking problem ( dirt and grit accumulates around the butterfly valve in the throttlebody ) to fix this simply remove the fresh air hose from the throttlebody and open the throttle all the way up use a clen rag and wipe clean you may use a solvent such as B12 on the rag but dont use too much 1_4_2013_4_54_06_am.jpg

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My jeep studders like it is starving for fuel

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