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1999 jeepgrand cheroke 4.0 the jeep loses spark and pulse in 2 and 5 cyl. it happens only when engine gets hot the codes said change cam crank senors coil pack andcomputer so i changed all of them no good then i opened every harness under the hood nothing checkedgrounds best i could no goog help thank you robert fabello ollebaf@aol.com

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It could be anything from a blocked cat converter to an air flow meter.It will be difficult to tell you.It's something to do with combustion and it could be a coil pack, o2 sensor or catalytic converter or an air mass meter.Check all wiring to coil pack and reset ECU from a pc.Be careful as you could end up buying lots of parts without getting the fault.

Posted on Jul 16, 2009

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Posted on Jan 02, 2017

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My 1999 Buick LaSabre dies after 15 minutes and will not restart til it cools down for 1 or 2 hours?


Have you done any testing? Any applicable trouble codes? How long since a tune-up?
When the vehicle stalls do some testing, if the engine is hot, wear gloves. Use a spark tester, check for spark with engine cranking. If spark everywhere, at least you know that system is ok.
If you lose rpm signal, during cranking, no spark, no fuel injector pulse. I have seen crank sensors that would do that, the rpm signal comes from crank sensor. Your not giving us enough info to determine if it is the crank sensor?

Feb 22, 2017 | Buick Cars & Trucks

1 Answer

I have a 99 jeep grand cheroke lerdo it when it


no engine type stated (options new) so no exact answers ever.
Generic answers. USA>
ever get a tune up this DECADE?
loss of power, hot.only.
misfiring? is it>?
does the scan tool show the MISFIRE codes, DTC P030x?
no its not the map sensor. why blame a very reliable part first.
why pick the most expensive parts first.
why not just a $1.49 spark plugs, or new wires.

spark be first. good , hot , reliable spark by any means.
if spark is bad, all the fuel on earth is useless. (otto cycle engines "gas")

Sep 30, 2014 | 1999 Jeep Grand Cherokee

2 Answers

What could cause a1991 suzuki samurai to have no fire from a new coil?


no spark from coil directly?
is the cam turning, is the dizzy rotor spinning. ????

check all fuses first. Ig-coil, FI and dome.
then using diagnostic jumper wire or fuse, (as approp)
crank engine look for code 41 o 42.!!!

USA cars , answers only
our cars are all EFI that year.
no engine swaps to Suzuki G16A/B sidekick or tracker engines.!
1: engine cranks
2: no spark
3: The ECu makes spark
the CMP sensor in the DIzzy , (never fails if rotor turns, does rotor turn, if not cam belt igored and now snapped.)
the cam turns. the CMP fires. the ECU takes this CMP signal
and fires the ignitor next to coil and the coil charges, and release and BAM spark.

that is it.
the ECU will tell you when the CMP dies or the Ignitor fails
why not ask it.
1: key on
2: diagnostic jumper in place (flashes 12s for ok)
3: crank engine,for 5sec, not 1 ,not 2.
3: release key not off.
4: see code 41, or 42, BINGO !@!!!!

Aug 15, 2014 | 1991 Suzuki Samurai

1 Answer

94 jeep has no spark at spark plug


94 GC ZJ body.
which engine option?
says you have no spark
so you read the fsm. on that.
on spark an fueling and the ASD relay.
no gas car runs with no spark and jeep cuts fuel if no spark is MONITORED as true, by ECU.

what a shop does,
is scan it , if no scan tool
he, uses one of the other 2 ways scan,called the blinking light deal.
i crank for 5seconds, and see if it stores, code, 11 or others.
click ZJ
click emmission
see chapter 25 on how to do flash CEL check engine tests.
the ECU will tell you if crank, cam senors are dead or they they are not dead but spark is.
if the ecu see any of those 3 errors, it cuts the ASD relay in 3seconds.


http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

it take 2 people to do this.
person one keys start. and sees ASD close for 2seconds.
you key fast and person looks for spark
if no spark that means the ASD didnt close
1: if cam and crank DTCs didnt happen then its spark bad.
2: cam/and crank sensor pass. then no spark that means
the ignitor is dead or coil.
check spark at coil not spark plugs.... for better way.

why people get so confused here is that there is only 2 seconds
to see spark..
let me give a prime example here: (shows the ropes)
person 2 saw spark for 2 seconds, but the ECU saw the CKP crank sensor misfiring 1 out of 10 times. the ECU considers this bad
and cuts the ASD , killing ALL, and setting CKP dtc error
fix bad CKP.
see?
all 3 tests must pass or the ECU will cut the ASD.
the asd kills spark and fuel.
not just fuel.
tricky yes, but no crash and burn like seen on TV.

im not sure but this ECU might store all DTCs found cranking
some cars dont. store bad spark. only CKP and CMP bad.
the ECU does see the spark singles bouncing back from the ignition coil primary, if missing it cuts ALL>


Mar 01, 2014 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Fusible lik wire relay


could be a fuse, not likely. get someone to check the DFI block. Is the imobiliser faulty?

Sep 06, 2013 | 1999 Mitsubishi Galant

1 Answer

2002 galant will start up fine cold and run for 20 min, after hot soak will not start, back fires through intake


Yes your 4 cyl engine uses direct spark with a coil over each spark plug.
And the computer controls the firing of the plugs and injector pulse.
The problem could be the crank or cam sensor, or the wiring harness, but in most cases the check engine light should be on and a code set.
You might want to check the computer for codes, then try the cam sensor.

Sep 22, 2012 | 2002 Mitsubishi Galant

1 Answer

My 1998 Dodge Durango won't start. No spark


check for power at the coil. There should be power anytime the engine is cranking. If there is no power let me know and i'll get you some more info.

If there is power check for pulse on the other wire. If there is pulse than replace the coil.

if there is no pulse I can get you more info on that as well.

Feb 08, 2012 | 1998 Dodge Durango

2 Answers

2002 Jeep Grand Cherokee Lardo misfiring


You say you changed the cam sensor. A1391 code is a crank sensor on the top of the trans. bell housing.

Feb 22, 2009 | 2002 Jeep Grand Cherokee

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