cam change-engine wont run

[blazintowers]

I have not invested in any type of tuner or wideband yet, guess i need to start looking into this a lttle more to decide if i should change cams . if i decide to go with, i believe the comp cam 260 has been reccommended , would it eliminate the need for tuners/adjustments?

 

[03MopaRamman]

It would IMO require a Superchips 3865. Some 03's respond different to the 260 and one guy experienced some stalling. That Cam may well be the next one I try as well but am contemplating a Crazy Jay on a 114. With a Cam and canned Tune you will need the more expensive fuel 91. My Truck currently runs on the SC 87 Tune with my 6.1 Cam.

If you want no Tuner the Mopar Performance Cam is what I would go for and it runs on the 5.7 springs and rods too from what my research reveils..

 

[03MopaRamman]

Curious what Valve springs and pushrods were used with your build? The 260 will require the proper valves and pushrods to work well.

Ryan and Kenneth have given some real good advice here. Good luck in solving your problem.

 

[blazintowers]

Thanks to everyone for the great info! Now I guess I need to make some decisions. New cam, tuners, etc.

Will I have better luck, or atleast easier tunability with the comp 260? The builder is still saying the truck will run with 111 degree LSA. That from 111 to 114 is so minute it should not be a problem. I explained it was and got nowhere...

 

[KGBIGCOUNTRY]

The 260 should work for you. Have you popped the valve covers yet? If you havent, when you do take a quick pic of the springs so we can see what he is using in there.

 

[blazintowers]

10-4, will do.
By the way, anyone want to share the throttle pedal position sensor procedure?

i was just messing around in my ram with a brand new engine wishing i was out cruising it and decided to fire it up just to hear her run. As long as i keep working the pedal she sounds good. even was able to get her idling around 1,000rpm but only if i set my foot on the pedal, as soon as i let off the idle drops and she croaks...cant hurt trying...thanks for reading and replys...

 

[blazintowers]

alright, found the tps thread, made no difference...

 

[blazintowers]

Just discovered another issue. Engine wont rev passed 4000rpm. I reach 4000 rpm around half throttle or so and after that if i depress throttle all the way to the floor, no change in rpm...could this all be related to the cam or do i possibly have another problem at hand? never tried to rev her up before so i never noticed this...it seem's rather odd.
anybody got any ideas??? also if any of you boys come to socal come on by for some BBQ and suds! its almost a 100 degrees here today.

 

[03MopaRamman]

Nice weather! Don't worry about the 4K Max RPM as the engine has a rev limiter when your in Park, mine does the same thing. Now you know with the 03 the max RPM is 5850 and with the Diablo should you go that route even with all the good things cannot increase you past that RPM (2003 Model Basterd). Now the Superchips allows you to do that so 6400 or 6500 is easy with it however downside is no custom tuning unless you can dabble with the addition of a PSC1-003, Hence why I suggested the SC and a 260, Crazy Jay or even Sidewinder on a 114 LSA. If your Cam is 111 then IMO you need to go Diablo for a custom Tune but its nice to know the Cam specs and perhaps if you have enough low end Torque then 5850 may be all you need in the Truck. AF Hemi did it on a 112 and was pleased and RedTruckVa has a 112 with Sc and PSC1-003.

Another Long post. Sorry for your disconnect with the builder! A pic of the valve train is a great idea and at worst case you can switch out to 6.1 rods and or comp cam rods if you go to the 260 if your springs are either 6.1 with buckets or powder silver Comp Cams Beehive or the Manleys (expensive). I'm sure Ryan or Kenneth can ID/compare them to see if 5.7's are in there. The rods can be popped out and measured so thats a no brainer as well.

 

[truckin151]

From a 111lsa to a 114lsa is a BIG change when it comes down to how the cam will run and tuned. Stock cam is either a 117lsa or a 116lsa. I'd pull that cam immediately stick in a 260 or crazy jay cam and run the superchips tuner and call it good. Also would be very hesitant about reving it up when its not running right with no way of logging anything as you can potentially kill the motor if something is to far off.

 

[blazintowers]

10-4. Thanks again for all the help from everyone. So I am going to swap cams. I know you guys have mentioned to use the vendors here, so who do I contact for the comp 260? Is there a specific model #?

 

[03MopaRamman]

Comp Cams Part Number is 112-500-11. I found cheapest one at $ 394.95 in a search last week but they were outta stock for 4-6 weeks at that particular Outfit. Up here in Canada the Price Localy is $497.99. So yeah about 400 for that one or you can splerge and get a Crazy Jay from Inertia for about $450.00. Try Duane at 1st Strike and see what he could do for ya or Dave at DB Customs but not sure if he does Cams or his new Website is up and running Yet.

Edit: The Sidewinder is $435 BTW and Sold by Modern Warefare. Specs are close to or the same as the Crazy Jay.

 

[KGBIGCOUNTRY]

I would been able to hook you up with a used one if you were not an 03. Dave might be able to get his paws on one if not Duane has a listing for them I believe or good ole Summit.

 

[truckin151]

Pm Dave and see if he can snag one for you. Otherwise summitracing or jegs usually have them fairly cheap. Just remember to do the 6.1 springs and push rods if they were not done already.

 

[KGBIGCOUNTRY]

^Yep if ya can snap a pic we can tell ya pretty quick.

 

[blazintowers]

right On! once i start the tear down and remove valve covers I definetly will..thanks again and my offer still stands for anyone in my neck of the woods!

 

[KGBIGCOUNTRY]

Dang west coaster's get the truck flown over here and we could get you straight. Before ya order anything snap a pic of the springs and rods and we can get you a parts order together on what you should start getting. Do you have a TRQ wrench by chance? Your gonna need that for the rocker arms, and cam bolt.

 

[truckin151]

Is Fred (Chefred112) still on here every now and then? I know he's in California but not sure the area. He's done a few cam swaps.

 

[Redtruck-VA]

Hello everyone, Ken told me we had a 03 not running so I thought I'd stop by. But I see you already have all the good help. I see it is running, but just won't idle . Before jumping into the engine I'd try to get your current setup working a little. I'm not a fan of DSP so take my comments for what they are worth. I'd find a used SC3815 as it is all you need on a 03. This will allow you to raise your rpm/speed limiters. The SC 91 tune also throws a little timing into the idle which helps. Split Second has a "Cam Tuner" which is simply a plug and play device that allows you to adjust MAP voltage to control fuel at idle. What you need to do is counter intutative as the idle surg is actually caused by being too rich., not being lean. The o2 sensor reads the A/F as being rich and signals the PCM to reduce fuel this cuts back and the O2 senses lean condition and then throws fuel back at it causing a surg loop. MAP signal is also messing with the fuel at this point. By pulling fuel it puts fuel completely in control of the O2 sensor. When you first started the engine it ran because it was running off of a table and not the O2 sensors. Another problem with narrow LSA cams is the 03 idle is too low to stablize the MAP signal. I manipulated the power steering sensor to make the PCM sense that the pwr steering pump is under high pressure which raises the idle. Mine starts cold and idles at 800 and then settles to 630-650. You need a A/F gage in the not too distant future and you might want to then use a PSC1-003 which does the same thing as the Cam Tuner but allows you to adjust a table across the entire rpm range. Understanding the differences between closed and open fuel loops. So bottom line I would think Cam Tuner, SC3815 and a raised idle will give you a good chance at a idle.
Plug-and-Play
It is about the third item down on the page. You can also review the PSC-003
Good luck...

 

[truckin151]

The problem really seems more like the cam itself, it does need tuning yes but take a look at the cam card he posted in his other thread.