Replaced heads problems

Tiny
KENNY ROOPE
  • MEMBER
  • 2004 JEEP GRAND CHEROKEE
  • 4.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 230,000 MILES
I just replace my heads and starts right up, idles fine but when I drove around block It stalled when I gave it gas. I got it home and noticed it blew the ASD 30amp fuse. Replaced it and after idled for 5-10 minutes blew another. I also noticed that I've got no vacuum pressure in the lines, can someone help?
Friday, July 26th, 2019 AT 10:09 AM

4 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

Whenever you have a fuse that keeps blowing it is from a short to ground somewhere in the circuit that that fuse is protecting. In the diagrams down below I have included a wiring diagram of your vehicle's charging system and a diagram and callout of your vehicle's Power Distribution Center, as well as instructions for how to find a short to ground in an automotive electrical circuit. Please go through these guides and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
Was this
answer
helpful?
Yes
No
Saturday, July 27th, 2019 AT 6:07 AM
Tiny
KENNY ROOPE
  • MEMBER
  • 3 POSTS
Thank you for the reply. I will let you know what the result is. Today I was trying to see if a vacuum line was the cause of my hesitation when stepping on the gas, and I hardly has any vacuum in the crankcase ventilation hoses. I had to fill the EGR hole in the head, there wasn't anything regarding to having the EGR hole in the old heads. Like I said it starts right up no issues, it idles great, but the fuse and hesitation when giving gas. I will try to trace the issue again tomorrow and tell you what happens.

Thanks
Was this
answer
helpful?
Yes
No
Saturday, July 27th, 2019 AT 10:30 PM
Tiny
KENNY ROOPE
  • MEMBER
  • 3 POSTS
I didn't see or find any open wires and will continue to look today. After reading some other similar issues, a couple say that the timing chains might be off a little could that possibly cause the hesitation? I know that when I did the timing, I used the old chains and bought new guides also made sure the two V marks left and right were at 12 oclock but the main chains two marked links were not lined up with the dot on the block. Once again, this is the first time doing my heads and don't have the funds to put in shop or buy a another car. If anyone has any possible info or has dealt with same issues is willing to help with info gladly appreciate thanx.
Was this
answer
helpful?
Yes
No
Monday, July 29th, 2019 AT 8:08 AM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

Yes, if the timing chain is off a tooth or two it will definitely cause drivability issues. As you know, the valves are designed to open at a certain time to get the most force on the piston with the exploding flame front from the air:fuel mixture, and if they are opening at the wrong time performance will be hurt and possibly your engine. The information that you requested is in the diagrams down below. Please keep us informed.

Thanks,
Alex
2CarPros
Was this
answer
helpful?
Yes
No
Tuesday, July 30th, 2019 AT 10:56 PM

Please login or register to post a reply.

Sponsored links