NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > Modified Tech Discussion
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

Modified Tech Discussion Forum for Tech related discussion for Modified XJ's and MJ's.

Reply
 
Thread Tools Display Modes
  #31  
Old March 28th, 2017, 18:43
Jeep Driver Jeep Driver is offline
NAXJA Forum User
 
Join Date: Jun 2016
Location: Parrottsville
Posts: 660
Re: Feeling weak (rebuilt 4.0, 4.56, AW4, 31s...), Why?

Quote:
Originally Posted by cherokeefan_1 View Post
I agree with johnx 100%. That's why you should always degree a cam when installing it. Just because it's new or a regrind does not mean it was done correctly or that the timing set was made correctly. If you've built numerous engines this becomes very apparent as each cam can show slightly different timing, even among the same grinds.
Which adjustable timing set do you have? because I have yet to see one.

When was the last time you dialed in your cam? How often do you dial it in?


I'm +4 at the crank, Mopar Performance (Cloyes) double roller. Most guys bitch and complain about $60 for a stock set...........


You?
Reply With Quote
  #32  
Old March 28th, 2017, 20:40
cherokeefan_1 cherokeefan_1 is offline
NAXJA Forum User
 
Join Date: Jul 2008
Location: Portland(for now)
Posts: 277
Re: Feeling weak (rebuilt 4.0, 4.56, AW4, 31s...), Why?

I've only built high performance SBC,BBC, and drag race 440's so all had adjustable sets put in them and all get checked and adjusted. Bushings can be used or you can buy adjustable gear sets. When I build stuff I don't go cheap as that's what you get when you do, cheap. Not all cams work well advanced/retarded some work best straight up. Some need to be adjusted a bit to get them to the correct specs.
Reply With Quote
  #33  
Old March 28th, 2017, 20:42
cherokeefan_1 cherokeefan_1 is offline
NAXJA Forum User
 
Join Date: Jul 2008
Location: Portland(for now)
Posts: 277
Re: Feeling weak (rebuilt 4.0, 4.56, AW4, 31s...), Why?

You can even get offset crank keyways but I don't trust them.
Reply With Quote
  #34  
Old March 28th, 2017, 21:26
clydefrog's Avatar
clydefrog clydefrog is offline
NAXJA Member
 
Join Date: Aug 2015
Location: Northern California
Posts: 463
Re: Feeling weak (rebuilt 4.0, 4.56, AW4, 31s...), Why?

Quote:
Originally Posted by notamos View Post
Thoughts?
Honestly. Time for an LS swap.

Sorry, I am no help, seriously though. Slow XJ got you down...LS swap!
Reply With Quote
  #35  
Old March 29th, 2017, 06:39
cal's Avatar
cal cal is offline
NAXJA Warranty Voider
 
Join Date: Nov 2004
Location: Hammertown, USA
Posts: 16,955
Re: Feeling weak (rebuilt 4.0, 4.56, AW4, 31s...), Why?

I am constantly amazed by how much of an idiot jeep driver is.

And yes I'd be looking for a compression test as well, followed by fuel pressure test under load.

I've retimed the cam on 4643 several times now and it makes a *drastic* performance difference, but its not less or more power, just moves the curve up and down the tach. I doubt the issue would be there. With the distributor off a tooth it is a clear problem, as it either won't want to idle or won't want to rev up.

Did you re-use your fuel injectors or replace them? I don't remember reading that.
__________________
I'm not a complete idiot - there are parts missing.

Last edited by cal; March 29th, 2017 at 07:49.
Reply With Quote
  #36  
Old March 29th, 2017, 06:57
Green XJ Jeep Green XJ Jeep is online now
NAXJA Member 4950
 
Join Date: Mar 2011
Location: Spanaway Wa
Posts: 551
Re: Feeling weak (rebuilt 4.0, 4.56, AW4, 31s...), Why?

Quote:
Originally Posted by cherokeefan_1 View Post
I've only built high performance SBC,BBC, and drag race 440's so all had adjustable sets put in them and all get checked and adjusted. Bushings can be used or you can buy adjustable gear sets. When I build stuff I don't go cheap as that's what you get when you do, cheap. Not all cams work well advanced/retarded some work best straight up. Some need to be adjusted a bit to get them to the correct specs.
With the cam, timing set and lifters that the op used I seriously doubt that its the issue if it was installed straight up and properly broken in.
Reply With Quote
  #37  
Old March 29th, 2017, 07:43
IslanderOffRoad's Avatar
IslanderOffRoad IslanderOffRoad is offline
NAXJA Forum Addict
 
Join Date: Apr 2006
Location: Houston, Tx
Posts: 8,613
Re: Feeling weak (rebuilt 4.0, 4.56, AW4, 31s...), Why?

Quote:
Originally Posted by cal View Post
I am constantly amazed by how much of an idiot jeep driver is.

And yes I'd be looking for a compression test as well, followed by fuel pressure test under load.

I've retimed the cam on 4643 several times now and it makes a *drastic* performance difference, but it not less or more, just moves the curve up and down the tach. I doubt the issue would be there. With the distributor off a tooth it is a clear problem, as it either won't want to idle or won't want to rev up.

Did you re-use your fuel injectors or replace them? I don't remember reading that.
I'm more amazed by the arrogance than the stupidity to be honest.
__________________
John V.
Director at Large

01 XJ Sport 2 door 5spd/4WD- 4" lift, Rubi wheels/tires JCR bumpers/sliders, armor, Rubi 44, Ford 8.8, 4.56's, ARBs.
Reply With Quote
  #38  
Old March 29th, 2017, 10:12
Jeep Driver Jeep Driver is offline
NAXJA Forum User
 
Join Date: Jun 2016
Location: Parrottsville
Posts: 660
Re: Feeling weak (rebuilt 4.0, 4.56, AW4, 31s...), Why?

Quote:
Originally Posted by cal View Post
I am constantly amazed by how much of an idiot jeep driver is.

And yes I'd be looking for a compression test as well, followed by fuel pressure test under load.

I've retimed the cam on 4643 several times now and it makes a *drastic* performance difference, but its not less or more power, just moves the curve up and down the tach. I doubt the issue would be there. With the distributor off a tooth it is a clear problem, as it either won't want to idle or won't want to rev up.

Did you re-use your fuel injectors or replace them? I don't remember reading that.
Show me an adjustable timing set for the 4.0

Post it.
Reply With Quote
  #39  
Old March 29th, 2017, 10:18
cal's Avatar
cal cal is offline
NAXJA Warranty Voider
 
Join Date: Nov 2004
Location: Hammertown, USA
Posts: 16,955
Re: Feeling weak (rebuilt 4.0, 4.56, AW4, 31s...), Why?

https://www.amazon.com/JP-Performanc.../dp/B00TO63LE8



That's the one I currently run. -8 to +8 in 2* increments.


https://www.amazon.com/Cloyes-9-3127.../dp/B000NGN6NE



Cloyes -4 and +4. I've run this one in the past.

Here's the post where I changed from one to the other.

http://www.naxja.org/forum/showpost....postcount=1766


I know for a fact there are others out there, but these are the two that I have run in the last year alone.
__________________
I'm not a complete idiot - there are parts missing.
Reply With Quote
  #40  
Old March 29th, 2017, 10:35
cal's Avatar
cal cal is offline
NAXJA Warranty Voider
 
Join Date: Nov 2004
Location: Hammertown, USA
Posts: 16,955
Re: Feeling weak (rebuilt 4.0, 4.56, AW4, 31s...), Why?

I'm not sure how you can claim it doesn't exist, and talk about using one, in the same post.


Your claim to idiocracy is more general though.
__________________
I'm not a complete idiot - there are parts missing.
Reply With Quote
  #41  
Old March 29th, 2017, 10:38
Jeep Driver Jeep Driver is offline
NAXJA Forum User
 
Join Date: Jun 2016
Location: Parrottsville
Posts: 660
Re: Feeling weak (rebuilt 4.0, 4.56, AW4, 31s...), Why?

That's not exactly dialing it in.
Reply With Quote
  #42  
Old March 29th, 2017, 10:39
Jeep Driver Jeep Driver is offline
NAXJA Forum User
 
Join Date: Jun 2016
Location: Parrottsville
Posts: 660
Re: Feeling weak (rebuilt 4.0, 4.56, AW4, 31s...), Why?

Quote:
Originally Posted by cal View Post
I'm not sure how you can claim it doesn't exist, and talk about using one, in the same post.


Your claim to idiocracy is more general though.
You don't know how to read do you read my post where I say that I am + 4
Reply With Quote
  #43  
Old March 29th, 2017, 10:40
cal's Avatar
cal cal is offline
NAXJA Warranty Voider
 
Join Date: Nov 2004
Location: Hammertown, USA
Posts: 16,955
Re: Feeling weak (rebuilt 4.0, 4.56, AW4, 31s...), Why?

You're the only person here who's ever used the phrase "dialing it in".

We're talking about a glorified tractor motor that appears to not have a timing problem, so if you would kindly, quit yammering on and let us get back to the OP's problem.
__________________
I'm not a complete idiot - there are parts missing.
Reply With Quote
  #44  
Old March 29th, 2017, 10:42
Jeep Driver Jeep Driver is offline
NAXJA Forum User
 
Join Date: Jun 2016
Location: Parrottsville
Posts: 660
Re: Feeling weak (rebuilt 4.0, 4.56, AW4, 31s...), Why?

Quote:
Originally Posted by cal View Post
You're the only person here who's ever used the phrase "dialing it in".

We're talking about a glorified tractor motor that appears to not have a timing problem, so if you would kindly, quit yammering on and let us get back to the OP's problem.
I'm the one that said he had a tuning problem I'm also the one who said he does not have a timing problem

I believe it is you who has the issue
Reply With Quote
  #45  
Old March 29th, 2017, 11:02
Hypoid's Avatar
Hypoid Hypoid is offline
NAXJA Member
 
Join Date: Jul 2006
Location: Golden, CO
Posts: 7,223
Re: Feeling weak (rebuilt 4.0, 4.56, AW4, 31s...), Why?

Quote:
Originally Posted by notamos View Post

For diag "tools", I have a timing light and Torque on my phone. Any basic tests you could recommend?
I am not familiar with that app. Can you cruise around and see if the ECU is in open, or closed loop?

So far, Trippled has given the easiest, and cheapest advise. If you find something, you find something. If you don't find anything, you can push controls to the back burner while looking at the mechanical aspects.

Something like this could make for a good Chapter Tech Day, if we can talk old_man into it.
__________________
The Lost Boys' motto: We don't know where we are going, but we'll be there for awhile...
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
I have a Bad feeling about this... jesterbomb OEM Tech Discussion 10 August 2nd, 2007 16:21
What is about the average price to have a 4.0 rebuilt and a AW4 rebuilt? newjeepowner OEM Tech Discussion 7 June 27th, 2006 19:31
just getting a feeling.... outlander For Sale: Private Party Only. XJ ITEMS ONLY 5 February 27th, 2005 10:57
feeling a bit sorry for myself Beej Non-Tech / Off Topic 7 December 18th, 2004 14:25


All times are GMT -7. The time now is 14:27.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014