Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WJ > Engine Performance/Intake/Exhaust

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 12-14-2011, 04:24 PM
Member
 
Join Date: Nov 2011
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1113
merwin10 is on a distinguished road
Exclamation 4.7L Won't Start

Hi All need some help!

Ok here is the problem - Had a friend helping me on my 2002 jeep GC 4.7L, NOT the HO!

Well we were doing allot of work TPS, Brakes, Lighting problem, etc. Any way the engine ran fine once we replaced the TPS. (no More DTC codes). So he started the lighting issue! It got late and he left and the key was left in the run mode over night! So the next day I went out and notice it checked the battery it was down to 3.6 volts. Hmmm! So I charged up the battery all day, till the charger said full! (has a new battery 3 months ago). Anyway when I go to start it all the necessary lights light up on the dash, gauges come to life. Turn the key to start and all it does is crank over. Does not even try to start! I don't even know where to start looking. Loosen the injector rail, it is getting fuel, sounds like no spark!

Hope something did not burn up!

Any thoughts?

thanks

Mike -
__________________

__________________
Reply With Quote
  #2  
Old 12-15-2011, 06:08 AM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 5,219
Thanks: 9
Thanked 124 Times in 117 Posts
Rep Power: 526239
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: 4.7L Won't Start

Did you check for DTC´s after the no start problem occured?
Did you check all fuses?
__________________

__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #3  
Old 12-15-2011, 09:37 AM
Member
 
Join Date: Nov 2011
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1113
merwin10 is on a distinguished road
Exclamation Re: 4.7L Won't Start

Hi Frango -

Thanks for the response! Yes! I checked for DTC after the no start problem! NO DTC's There is power at the OBDII connector! After playing with it some more I did find something else! The SKIS (Sentry Key Immobilizer System) light is acting funny, never seen it stay on! Perhaps the SKIS is preventing the engine from starting. Boy how I hate all these SAFETY features, they just complicate matters! Funny how so many things are interconnected, one part breaks and effects 20 other systems! But I bought this WJ cheap so just have to work thru some issues!

Mike -
__________________
Reply With Quote
  #4  
Old 12-15-2011, 09:44 AM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 5,219
Thanks: 9
Thanked 124 Times in 117 Posts
Rep Power: 526239
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: 4.7L Won't Start

Do you have a spare key to see if it will work with that one? Maybe a wire disconncted during the other trouble shooting procedures?
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #5  
Old 12-15-2011, 10:02 AM
Member
 
Join Date: Nov 2011
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1113
merwin10 is on a distinguished road
Re: 4.7L Won't Start

Hi Frango

Unfortuneately no second key! Used car so keys are going to be a problem as I don't have the PIN number either! That means a trip to the Jeep dealer! SUK!

Mike -
__________________
Reply With Quote
  #6  
Old 12-15-2011, 10:22 AM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 5,219
Thanks: 9
Thanked 124 Times in 117 Posts
Rep Power: 526239
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: 4.7L Won't Start

When the SKIS light stays on, the system indeed prevents the engine from starting. There is a kind of antenna ring aroung the ignition switch, did you do something overthere? When it was running in the beginning, there must have happened something. Did you check the fuses? Fuse 7 and 22 on the junction block under the steering wheel are for the SKIM.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #7  
Old 12-15-2011, 10:39 AM
Member
 
Join Date: Nov 2011
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1113
merwin10 is on a distinguished road
Re: 4.7L Won't Start

Hi Frango -

Did not touch the ignition switch other than to start the engine before the problem started! I will have to check the fuses 7 and 22!

Mike -
__________________
Reply With Quote
  #8  
Old 12-15-2011, 11:40 AM
Member
 
Join Date: Nov 2011
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1113
merwin10 is on a distinguished road
Exclamation Re: 4.7L Won't Start

Hi Frango -

Well you were almost right! Was not the SKIS after all, ever though the ligt was on, damn computers lead you wrong every time! Why the DCU turned on the SKIS light is beyond me! You mentioned checking 7 and 22 fuses so while there I checked a few more! Found a blown fuse, #12 Auto shut Down Relay / Fuel! Replaced the 10 amp fuse started right up and ran fine!

So now onto the next and last issue! I am showing a Stored DTC of P0770, which is a transmission issue with solenoid #4c. I am betting that once the TCM is cleared it will not reset the P0770! I believe it was realated to a TPS that I replaced, it was causing the engine to race in park and netural, it had a flat spot in it when back probed. Replaced the TPS no more racing and runs much better!

Thanks for your replies!

Mike -
__________________
Reply With Quote
  #9  
Old 12-15-2011, 12:58 PM
Member
My Jeep: 2004 4.7 HO WJ
 
Join Date: Jan 2011
Location: Fortville, Indiana
Posts: 109
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 1507
Me Fix is on a distinguished road
Re: 4.7L Won't Start

Frango is in here all the time. One of the best friends we can all have. Knowledgable and very friendly with his helpful hints.

Thanks, Me Fix
__________________
Reply With Quote
  #10  
Old 12-15-2011, 05:45 PM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 5,219
Thanks: 9
Thanked 124 Times in 117 Posts
Rep Power: 526239
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: 4.7L Won't Start

It is always a good start to check all fuses when an electrical system stops working without a known reason. Fuse 12 is indeed feeding the auto shutdown relay, as well as the fuel pump relay and is one of the power inputs to the PCM. And the SKIM............ no idea why it was switching the SKIS light on.
Thanks for the nice words Me Fix, i like to help others and its a hobby for me.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #11  
Old 12-21-2011, 03:47 PM
Member
 
Join Date: Nov 2011
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1113
merwin10 is on a distinguished road
Cool Re: 4.7L Won't Start

Hi All -

Yep The p0770 was a stored event for some reason! Once we got it on the drbIII and cleared the TCM everything is back to normal!

You know it is so hard with all these computers and sensors that are tied together to run this or that! Been reading the 545RFE transmission manual and it is totally relying on the engine sensors to make decisions about the learning setup! There is even a Quick Learn that uses the TPS among other things that has to be at a particular percentage open setting for the quick learn procedure to work! What a pain!

Fortunately, I have a Chrysler tech with the borrowed drbIII. Boy they want big $$$$ for them!

Mike -
__________________
Reply With Quote
  #12  
Old 01-10-2012, 07:52 AM
Member
 
Join Date: Dec 2011
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1107
TACFIRE325 is on a distinguished road
Re: 4.7L Won't Start

Nice Information!! While I have a JGC 02 4.0 4x4, Had some of the same tranny issues. (Yeah! What a surprise...) Anyway, just wanted to post that even though the engines are different, the tranny link to the TPS sensor is still the same for the 4.0. I have had all kinds of issues & started replacing sensors, because the codes given. I even change the "Governor Pressure Sensor, in the tranny because of a P1762 error.

At my wits end I spoke to a friend of a friend & as I started telling him what was going on with the tranny issues, he cut me off & said change the TPS. I thought "This guy's nuts!" He picked up on the silence & said "I know you think I'm nuts, but replace it anyway. If it doesn't fix your problem, I'll buy the part from you for what you paid." He even said that P1762 code for the GPS in the tranny was probably a result of the bad TPS sensor.

Well, I did... & it did... & now it's running fine. Few other issues, but I know it is not the TPS causing it...
__________________

__________________
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
The Start of My WK snow99dohc Members Rides 42 04-22-2012 03:48 AM
doesn't start ken M Troubleshooting/Problems 6 11-02-2011 10:45 AM
99 4.7l No start...Please Help... SuperTuner12010 Engine Performance/Intake/Exhaust 3 05-05-2011 01:04 PM
Need Help No Start. 252crew Grand Cherokee - WK 10 03-25-2011 03:56 PM
Where do I start Marbs Grand Cherokee - WK 21 05-10-2010 06:48 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 03:17 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by Chrysler Group LLC.