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Old 08-24-2014, 10:10 PM
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Default rpm issue

I have pm'd a couple guys about this issue I am having but thought I would post up. how or what would all of the sudden cause my truck to not go above 3500rpm? up untill my last couple pulls it would easily run 3800+rpm and now it stops at 3500 and kinda bounces 3450-3500 and spits and sputters like a gassers rev limiter... only oddball codes that has came up is a upshift selector wheel malfunction. I dont remember the exact code number and every now and then it will throw a speed sensor code.. used to throw a cps intermittent code but that hasnt happened since I shimmed it out far enough to stop hitting the tone ring.. sooooo, any ideas?

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  #2  
Old 08-24-2014, 10:40 PM
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Quote:
Originally Posted by lincolnlocker View Post
I have pm'd a couple guys about this issue I am having but thought I would post up. how or what would all of the sudden cause my truck to not go above 3500rpm? up untill my last couple pulls it would easily run 3800+rpm and now it stops at 3500 and kinda bounces 3450-3500 and spits and sputters like a gassers rev limiter... only oddball codes that has came up is a upshift selector wheel malfunction. I dont remember the exact code number and every now and then it will throw a speed sensor code.. used to throw a cps intermittent code but that hasnt happened since I shimmed it out far enough to stop hitting the tone ring.. sooooo, any ideas?

live life full throttle
Corrupted calibration on that certain position? Does it does it have the problem on all tuning positions? Chip seated tight? My 7.3 pulled all the way to 4500.
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Old 08-25-2014, 05:57 AM
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Think it might have anything to do with your cps issue?
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Old 08-25-2014, 06:33 AM
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Originally Posted by Powerstroke Man 6.4 View Post
Corrupted calibration on that certain position? Does it does it have the problem on all tuning positions? Chip seated tight? My 7.3 pulled all the way to 4500.
guess I never tried switching tunes, but in the last 3 years I have never switched tunes off the hot setting... and yes the chip is tight. Jonathan put enough solder on it to where it almost takes pliers to get it out. and what I am saying is that it just up and started doing it.. I have done 4k+rpm burnouts and ran down the pullin track at 4100 before. now all of a sudden its like someone installed a rev limiter.
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Think it might have anything to do with your cps issue?
well, thats what I thought all along but the code hasnt popped back up yet!

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god bless america and the farmer who feeds your fat ass
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Old 08-25-2014, 06:37 AM
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CurtisF, if you are still lurking, you need to clean out your pm box so I can answer you back. lol..

live life full throttle
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00,f350,4x4,cc,drw, under the knife
01 rclb zf6,4x4,srw,ts tunes,bfaf,4"exhaust, 3800lb dd clutch
12,f350,4x4,cclb,srw, rudys/punch it d3lete tunes, donaldson bfaf.
god bless america and the farmer who feeds your fat ass
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Old 08-25-2014, 05:09 PM
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I would check to see if the cam is walking. Pull the sensor androll the engine a couple revolutions. Then mesure how far it is from the front cover then roll it over backward a couple times and recheck. The heilicle cut gears should push it to both extremes so you can check end play
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Old 08-25-2014, 06:30 PM
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Originally Posted by pontiacross View Post
I would check to see if the cam is walking. Pull the sensor androll the engine a couple revolutions. Then mesure how far it is from the front cover then roll it over backward a couple times and recheck. The heilicle cut gears should push it to both extremes so you can check end play
thanks Ross! I will do that. but how would that all of a sudden limit rpm?

when I had the heads off last Thursday I looked down at the lobes and they all looked uniform and not worn or shined up all the way across the lobe like it was walking... but I guess a few thousands wouldnt be seen with the naked eye.

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00,f350,4x4,cc,drw, under the knife
01 rclb zf6,4x4,srw,ts tunes,bfaf,4"exhaust, 3800lb dd clutch
12,f350,4x4,cclb,srw, rudys/punch it d3lete tunes, donaldson bfaf.
god bless america and the farmer who feeds your fat ass
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Old 08-25-2014, 08:15 PM
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Quote:
Originally Posted by lincolnlocker View Post
thanks Ross! I will do that. but how would that all of a sudden limit rpm?

when I had the heads off last Thursday I looked down at the lobes and they all looked uniform and not worn or shined up all the way across the lobe like it was walking... but I guess a few thousands wouldnt be seen with the naked eye.

live life full throttle
My thinking is the cam gear may be getting a little to far from the sensor and it is having trouble picking up the signal at high rpms
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sold
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-03 f250 2wd 7.3 6 speed (sons truck)
-95 f350cc dually 2wd 460
  #9  
Old 08-25-2014, 08:39 PM
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Quote:
Originally Posted by pontiacross View Post
My thinking is the cam gear may be getting a little to far from the sensor and it is having trouble picking up the signal at high rpms
yeah, I have been battling that issue too.. it started going through cps's then I put shims in it. it hasn't thrown any cps codes like it always has. thats where im lost cuz they havnt popped up since the shims where put in.. hell it used to throw hard codes all the time. soft codes where always present but the last couple pulls the codes never came up....

live life full throttle
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00,f350,4x4,cc,drw, under the knife
01 rclb zf6,4x4,srw,ts tunes,bfaf,4"exhaust, 3800lb dd clutch
12,f350,4x4,cclb,srw, rudys/punch it d3lete tunes, donaldson bfaf.
god bless america and the farmer who feeds your fat ass
  #10  
Old 08-26-2014, 05:16 AM
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Ive been battling a very similar issue on my obs for almost a year and still no luck.
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