Question about 1999 Jeep Grand Cherokee

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My 99 grand cherokee laredo misses at an idle and i had 4 codes, cam sensor voltage low,crank sensor voltage low, coil ad missfire,cyl #6 missfire. changed both sensors and coils, slill misses called the dealership they told me the cicuit of both sensors each should have a wire w 5 volts and one w 8 volts but both had 5 volts when i checked them. does this mean i need a new ECM?

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You can't answer that kind of question. Have to have the vehicle,know the systems and follow a diagnostic tree to find the problem.

Posted on Apr 30, 2010

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1999 jeep grand cherokee laredo just stops while driving


Does it stall at idle or going down the highway? Does it restart right away? How long since a tune-up? Are there any applicable trouble codes? Check the cam and crank sensor. Could be other issues?

Sometimes the oil drive housing can cause a sync problem between the crank and cam sensors?

Jun 18, 2016 | 1999 Jeep Grand Cherokee

1 Answer

I HAVE TO CHANGE OUT A CRANK SENSOR IN MY GRAND CHEROKEE.


Jeep Crank Sensor Replacement, P Codes P0351, P1391 ...

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www.youtube.com/watch?v=7D0vUEDSwXo
May 12, 2013 - Uploaded by Robert DIY Replaced the crank sensor on this 2003 Jeep Grand Cherokee.... to replace my crankshaft position sensor on my 1998 grand cherokee laredo.

Jeep Crankshaft Position Sensor Replacement (CKP, CKPS ...

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www.youtube.com/watch?v=1Ho5iAKQV00

Oct 27, 2013 - Uploaded by WeekendHandymen
hi , do you think if I replace crank sensor will solve the problem ,my jeep .... Where's the crankshaft located in 99 jeep grand Cherokee laredo .


Oct 24, 2015 | Cars & Trucks

2 Answers

How to replace spark plugs on 2000 jeep cherokee classic 6 cyl.? Also does 2000 cherokee have inline fuel filter?


TO REPLACE SPARK PLUGS YOU REMOVE COIL PACK MOUNTING BOLTS THEN REMOVE THE COIL PACK WITH BOOT OVER THE SPARK PLUG.YOU HAVE 6 INDIVIDUAL COIL PACK TO EACH CYLINDER. YOU NEED A 3/8 RATCHET WRENCH - LONG 3/8 EXTENSION -SPARK PLUG SOCKET - SPARK PLUG GAUGE.AND TORQUE WRENCH.THE 2000 MODEL JEEPS FUEL FILTER INSIDE THE TANK.1993 - 1996 MODEL JEEPS FUEL FILTER LOCATED LEFT SIDE OF THE VECHICLE NEAR THE FUEL TANK.

Jul 20, 2010 | 2000 Jeep Grand Cherokee

3 Answers

P0308 cylinder 8 misfire detected? How to repair?


Fuel injector cleaner commonly has a low success rate, and will not help if it's more than one cylinder that is missfiring. The fact that you have a "rattle" noise, leads me to beleive the engine is not receiving fuel on one or more cylidners. If it is all the cylinders, than the fuel pump may be the culprit, or the fuel pump circuit. But if only one cylidner is missfiring than it is a possibly an injector. A code P0300 refers to all cylinder missfires, and any code between P0301-P0308 distinugiushes a particular cylinder.

Misfiring
1- a general electrical tune-up (spark plugs, wire set, cap & rotor) is a basic start to cure this issue. Wiggle the dist shaft while you are in there, if you have one.
2- Then a good carbon cleaning / throttle-body cleaning.
3- Vacuum leaks at any of the hoses that connect to the Intake manifold; especially the MAP sensor connection.
4- If that does not help then the O2 sensor could be bad or drifting.
5- Funky coil/coil-packs
6- Theoretically a microsecond glitch in either the cam or crank shaft sensors would cause this, but I am not aware of this as a typical cause.
7- Lastly a funky PCM but again it is not common for this to cause miss-firing.

Note for the V8 then also:
a) bad erg valve (this dilutes the combustion gases and hence raises the combustion temp
b) a leaky plenum/Intake manifold gasket. Leaking Intake gasket symptoms

Also can check the TSB 18-48-98 Ignition System Cross Fire/Secondary Ignition Wire Induction (Complete Version )

Hope help with this (remember rated this). Good luck and have a nice day.

Mar 05, 2010 | 1997 Jeep Grand Cherokee

1 Answer

1996 Jeep Grand Cherokee Laredo won't fire. Was


check the cam sensor and crank sensor, also is the distributor turning,possible distributor gear pin broke

Nov 08, 2009 | 1996 Jeep Grand Cherokee

1 Answer

Po300 code, replaced 1 crank sensor needing to know voltage on se


Resistance check the coils. Check for spark on all 6 cylinders.

Apr 02, 2009 | 1999 Pontiac Grand Am GT

1 Answer

Jeep Hesitates. P0303 code


Check the cylinders Commpression. over 115 psi is good, 120 psi is normal.

Sep 17, 2008 | 2001 Jeep Grand Cherokee

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