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5.9 magnum hates mods? #809912 09/21/10 01:37 AM 09/21/10 01:37 AM
Joined: Aug 2010 Posts: 16 Bellville, Texas U Ultanium OP member
Ultanium OP member U Joined: Aug 2010 Posts: 16 Bellville, Texas	I have been building a dak much like the scat Dak project in Mopar Action. I started with a '95 truck with a 5.2, dropped in a '94 5.9 & Mopar computer, & drove the tires off it. Got a few bucks saved up, added a comp cams 262 roller (260/262 .480/512), new lifters, double roller chain (0�), m1, EQ heads (2.02), all new sensors, large manifolds like Ehrenberg used, stock injectors & TB. We fired it up today, & no matter what we did, it was a dog. It idles rough, dies often, & I feel like I wasted my time & money. EGR seems fine, playing with the timing made it a little better, but harder to start. Any ideas on why this thing doesn't even bark the tires? Appreciate any advice!! Tom in Texas

Re: 5.9 magnum hates mods? [Re: Ultanium] #809913 09/21/10 01:45 AM 09/21/10 01:45 AM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	Could be running lean with the better flowing heads and new cam. May need to either up your fuel pressure a bit or step up injector size. Ideally you would have your computer recalibrated but I don't know if anyone offers that for those trucks.

Re: 5.9 magnum hates mods? [Re: DaytonaTurbo] #809914 09/21/10 08:10 AM 09/21/10 08:10 AM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	I'll guess your stock injectors aren't able to keep up. When you do that much modification the computer might need a upgrade. I'd swap the injectors out 1st. What did the magazine build use? [IMG]http://i66.tinypic.com/pui5j.jpg[/IMG] Coming soon!!!!

Re: 5.9 magnum hates mods? [Re: Mr.Yuck] #809915 09/21/10 08:17 AM 09/21/10 08:17 AM
Joined: Jun 2008 Posts: 10,847 Oakdale CT gdonovan I Live Here
gdonovan I Live Here Joined: Jun 2008 Posts: 10,847 Oakdale CT	I suspect a computer issue, they do have tuners now. BTW- Fuel injection and timing control are keyed off the distributor location, you can't just crank it about without screwing up the PCM's reference signal.

Re: 5.9 magnum hates mods? [Re: Mr.Yuck] #809916 09/21/10 08:18 AM 09/21/10 08:18 AM
Joined: Jun 2010 Posts: 798 Houston TX G GregCon super stock
GregCon super stock G Joined: Jun 2010 Posts: 798 Houston TX	There could be many reasons, but for a start you are probably outside the operating range of one or more parameters in the PCM. The simple fix would be to connect the PCM to your laptop and reprogram the initial values. Unfortunately, the PCM is not reprogrammable in that fashion - hence the need for a custom 'burn' and all the PITA associated with that.

Re: 5.9 magnum hates mods? [Re: Ultanium] #809917 09/21/10 08:19 AM 09/21/10 08:19 AM
Joined: Jan 2006 Posts: 8,162 USA 3 360view Moparts resident spammer
360view Moparts resident spammer 3 Joined: Jan 2006 Posts: 8,162 USA	If "it idles rough and dies often" then the pintle valve seat inside the EGR valve may be so corroded that it is letting a lot of flow all the time At full throttle the EGR flow should be totally off but if the pintle seat does not seal that will lower your volumetric efficiency and drop horsepower.

Re: 5.9 magnum hates mods? [Re: GregCon] #809918 09/21/10 08:23 AM 09/21/10 08:23 AM
Joined: Jun 2008 Posts: 10,847 Oakdale CT gdonovan I Live Here
gdonovan I Live Here Joined: Jun 2008 Posts: 10,847 Oakdale CT	94-95 is the old style PCM, to take advantage of a hand held tuner you have to step up to 96 electronics so you can use a SCT tuner. I'd double check your basics though before going there. I have pointed out this thread to someone who has done a lot of Magnum modding, maybe he will chime in.

Re: 5.9 magnum hates mods? [Re: gdonovan] #809919 09/21/10 08:58 AM 09/21/10 08:58 AM
Joined: Feb 2003 Posts: 203 CT b1llyw super street
b1llyw super street Joined: Feb 2003 Posts: 203 CT	Sounds to me like the fuel sync is way off. That combo should work fine with that PCM. Get your fuel sync set, see where that leaves you. You are probably borderline on injector sizing. Bill White - BionicDodge.com http://www.revelation320.org

Re: 5.9 magnum hates mods? [Re: b1llyw] #809920 09/21/10 09:37 AM 09/21/10 09:37 AM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	Quote: Sounds to me like the fuel sync is way off. That combo should work fine with that PCM. Get your fuel sync set, see where that leaves you. You are probably borderline on injector sizing. Could his TB be too small? I mean what do those 2bbl (2 hole) flow? 500-600cfm max????

Re: 5.9 magnum hates mods? [Re: Mr.Yuck] #809921 09/21/10 09:43 AM 09/21/10 09:43 AM
Joined: Feb 2003 Posts: 203 CT b1llyw super street
b1llyw super street Joined: Feb 2003 Posts: 203 CT	Quote: Quote: Sounds to me like the fuel sync is way off. That combo should work fine with that PCM. Get your fuel sync set, see where that leaves you. You are probably borderline on injector sizing. Could his TB be too small? I mean what do those 2bbl (2 hole) flow? 500-600cfm max???? He would benefit from a larger throttle body but it's not small enough to cause these kinds of problems. I'd recommend this guy if he decides to upgrade. http://stores.hi-potek.com/-strse-DAKOTA-cln-ENGINE-cln-Throttle-Body/Categories.bok Bill White - BionicDodge.com http://www.revelation320.org

Re: 5.9 magnum hates mods? [Re: Mr.Yuck] #809922 09/21/10 10:23 AM 09/21/10 10:23 AM
Joined: Jun 2008 Posts: 10,847 Oakdale CT gdonovan I Live Here
gdonovan I Live Here Joined: Jun 2008 Posts: 10,847 Oakdale CT	Quote: Could his TB be too small? I mean what do those 2bbl (2 hole) flow? 500-600cfm max???? Would not explain the idle issue, the throttle blades are closed. At that point what the throttle body flows in a non-issue. Start with the basics, set the fuel sync (distributor) which is critical for proper operation.

Re: 5.9 magnum hates mods? [Re: gdonovan] #809923 09/21/10 10:43 AM 09/21/10 10:43 AM
Joined: Feb 2003 Posts: 203 CT b1llyw super street
b1llyw super street Joined: Feb 2003 Posts: 203 CT	http://www.bionicdodge.com/Download/Adjusting%20the%20idle%20for%20a%20Magnum.pdf http://www.bionicdodge.com/Download/Camshaft%20Timing%20and%20Setting%20Fuel%20Sync.pdf From my site, maybe these will help. Bill White - BionicDodge.com http://www.revelation320.org

Re: 5.9 magnum hates mods? [Re: Ultanium] #809924 09/21/10 12:21 PM 09/21/10 12:21 PM
Joined: Apr 2007 Posts: 905 SD Z zrxkawboy super stock
zrxkawboy super stock Z Joined: Apr 2007 Posts: 905 SD	Quote: playing with the timing made it a little better I didn't think timing was adjustable...? It's Swifty! Swifty, you toad sucker!

Re: 5.9 magnum hates mods? [Re: zrxkawboy] #809925 09/21/10 12:31 PM 09/21/10 12:31 PM
Joined: Feb 2003 Posts: 203 CT b1llyw super street
b1llyw super street Joined: Feb 2003 Posts: 203 CT	Quote: Quote: playing with the timing made it a little better I didn't think timing was adjustable...? You can play with the timing chain and/or crank sensor to play with base timing. Bill White - BionicDodge.com http://www.revelation320.org

Re: 5.9 magnum hates mods? [Re: zrxkawboy] #809926 09/21/10 12:33 PM 09/21/10 12:33 PM
Joined: Aug 2010 Posts: 16 Bellville, Texas U Ultanium OP member
Ultanium OP member U Joined: Aug 2010 Posts: 16 Bellville, Texas	Man, you guys are awesome! All good advice and I'm reading the PDF's from Bionic Dodge now, good stuff. I thought the Mopar Performance computer would be able to keep up with these mods, & if it was a '96 I would be able to flash it. I will get this thing synced this evening, and see what it does. What would be the next step up for injectors? I think I recall reading something about using blue ford injectors, but I cannot find it. Thanks again for all of the replies. Tom in Texas

Re: 5.9 magnum hates mods? [Re: Ultanium] #809927 09/21/10 01:49 PM 09/21/10 01:49 PM
Joined: Feb 2003 Posts: 203 CT b1llyw super street
b1llyw super street Joined: Feb 2003 Posts: 203 CT	No problem. Bruce is a Ford guy but his site is a good source for injectors. http://www.fiveomotorsport.com/ Bill White - BionicDodge.com http://www.revelation320.org

Re: 5.9 magnum hates mods? [Re: b1llyw] #809928 09/22/10 12:03 AM 09/22/10 12:03 AM
Joined: Aug 2010 Posts: 16 Bellville, Texas U Ultanium OP member
Ultanium OP member U Joined: Aug 2010 Posts: 16 Bellville, Texas	Well we think we have solved the rough idle problem. For several days I had a friend over tearing down the motor when we started this build. Well today we noticed a lot of jitter in the timing & misfires, so we went back to check the crank sensor and reluctor, and every hole was bent up so badly that it chewed the end of the sensor off. With friends like that, who needs....

Re: 5.9 magnum hates mods? [Re: Ultanium] #809929 10/05/10 11:53 PM 10/05/10 11:53 PM
Joined: Sep 2003 Posts: 1,688 Marlboro, NY, USA R Rick_Ehrenberg top fuel
Rick_Ehrenberg top fuel R Joined: Sep 2003 Posts: 1,688 Marlboro, NY, USA	Remember, MT and AT crank Hall effect sensors are different lengths. Or...crank bolts loose? Rick

Re: 5.9 magnum hates mods? [Re: Ultanium] #809930 10/05/10 11:56 PM 10/05/10 11:56 PM
Joined: Sep 2003 Posts: 1,688 Marlboro, NY, USA R Rick_Ehrenberg top fuel
Rick_Ehrenberg top fuel R Joined: Sep 2003 Posts: 1,688 Marlboro, NY, USA	Quote: ...added a comp cams 262 roller (260/262 .480/512) The project truck has a dead-stock 2001 cam. Rick E.

Re: 5.9 magnum hates mods? [Re: Rick_Ehrenberg] #809931 10/06/10 10:17 AM 10/06/10 10:17 AM
Joined: Jul 2006 Posts: 115 louisiana,usa O olemopar member
olemopar member O Joined: Jul 2006 Posts: 115 louisiana,usa	looks like a bar in the cps slots to rotate the ingine during build up ?? Thad

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