tunner question
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Senior User
Joined: Feb 2004
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From: Sebring, FL
tunner question
With a tunner will the SES light come on due to over boosting the pcm setting. Just curious cause I dont think I can even hit 25psi with the tunner set on its highest setting, also with the tunner I get some weird problem where I accelerate hard and as the RPMS climb I seem to loose power for a few seconds and then its back. Also Ive heard in with the stock program if you unhook the red line going to the wategate you should get an SES light...not my truck I can barely hit 20psi under hard acceleration.Any ideas and I get no codes at all.
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From: New Hampshire
hmmm.... that doesn't sound right.... even with my predator set on the 40hp tow tune i can get over 20lbs of boost pretty easy... and with the 85hp tune loaded she goes right to 24lbs of boost FAST...! and FAST is what my truck goes at that point... sounds like you have a fuel problem somewhere... maybe fuel pressure...
Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
I agree with Johnny8. My truck will hit 28 on the 60 HP setting SES light on and everything. So far I haven't experienced the dreaded "defuel" that everyone says happens.
I recommend putting the truck back to the stock setting and then do some diagnostics. Fuel pressure at WOT not just idle. It needs to be at least 55 psi at all times.
Another thought, a problem with the HPOP, but that would make very hard starting, engine hot, which you haven't mentioned so I think that's less likely.
Get the foundation proper and then add the tune.
I recommend putting the truck back to the stock setting and then do some diagnostics. Fuel pressure at WOT not just idle. It needs to be at least 55 psi at all times.
Another thought, a problem with the HPOP, but that would make very hard starting, engine hot, which you haven't mentioned so I think that's less likely.
Get the foundation proper and then add the tune.
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From: Sebring, FL
The truck starts fine and seems to run fine with no tune, I did down load the newest update for the tunner and I will see what I get..also on my way to work I'll bug in the tunner and see if it reads fuel pressue and I'll monitor it and see if it stays around 55psi.
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From: Cabot, Arkansas
Originally Posted by Kwikkordead
My truck will hit 28 on the 60 HP setting SES light on and everything. So far I haven't experienced the dreaded "defuel" that everyone says happens.
Once you defeat the SES light and feel your actual top end power you'll see what I mean.
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Joined: Jul 2005
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From: 21791
yeah i had the same problem. after putting my dual relief valve in, i volunteered to use my truck to haul my dad's 6000 lb skidloader and trailer. i drove on setting 2 (tow, on the edge), and i drove in OD off. crossed a bridge under construction, at about 2250 rpm. then i gave it alot of pedal, to gain my speed back up the hill. it just hissed loudly (from the filter) and bogged down. it did not shift down, but rather bogged to about 1750. the monitor read 850*, about 13 lbs of boost. only 13 lbs! it didnt seem right, i thought that thing would shift and walk up that hill like nobody's business. i am going to change my fuel filters, to start. the SES light still came on though.???
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From: Rio Rico, AZ.
Originally Posted by cookie88
Actually, you have. When the PCM defuels, it basically just holds where it is. There is no huge power loss, it simply stops the fueling table at the point the light comes on.
Once you defeat the SES light and feel your actual top end power you'll see what I mean.
Once you defeat the SES light and feel your actual top end power you'll see what I mean.
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Originally Posted by strokin_it7.3
yeah i had the same problem. after putting my dual relief valve in, i volunteered to use my truck to haul my dad's 6000 lb skidloader and trailer. i drove on setting 2 (tow, on the edge), and i drove in OD off. crossed a bridge under construction, at about 2250 rpm. then i gave it alot of pedal, to gain my speed back up the hill. it just hissed loudly (from the filter) and bogged down. it did not shift down, but rather bogged to about 1750. the monitor read 850*, about 13 lbs of boost. only 13 lbs! it didnt seem right, i thought that thing would shift and walk up that hill like nobody's business. i am going to change my fuel filters, to start. the SES light still came on though.???
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Originally Posted by unluckylow
With a tunner will the SES light come on due to over boosting the pcm setting. Just curious cause I dont think I can even hit 25psi with the tunner set on its highest setting, also with the tunner I get some weird problem where I accelerate hard and as the RPMS climb I seem to loose power for a few seconds and then its back. Also Ive heard in with the stock program if you unhook the red line going to the wategate you should get an SES light...not my truck I can barely hit 20psi under hard acceleration.Any ideas and I get no codes at all.
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Joined: Nov 2004
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From: New Hampshire
i have the dual relief valve setup... no more overboost defueling issues... but i do get the exhaust pressure too high code every so often... sounds like a 5" system is in order...! any opinions as to wether or not one of those will cure this backpressure problem..?
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From: Rio Rico, AZ.
Originally Posted by johnny8
i have the dual relief valve setup... no more overboost defueling issues... but i do get the exhaust pressure too high code every so often... sounds like a 5" system is in order...! any opinions as to wether or not one of those will cure this backpressure problem..?
I noticed that the engine revved up a lot easier with the new system.
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From: New Hampshire
Originally Posted by Kwikkordead
It might help, but the sensor is still on the upstream side of the turbocharger.
I noticed that the engine revved up a lot easier with the new system.
I noticed that the engine revved up a lot easier with the new system.
Joined: Dec 2004
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Originally Posted by johnny8
i have the dual relief valve setup... no more overboost defueling issues... but i do get the exhaust pressure too high code every so often... sounds like a 5" system is in order...! any opinions as to wether or not one of those will cure this backpressure problem..?
This is a typical problem with these trucks, when you run a chip of any kind. Soot gets in the pipe.
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From: Sebring, FL
Originally Posted by wildbill1963
Where are you reading boost from, and if you are reading from MAP line, is anything else connected to that line. Something doesnot sound right. You should be able to get more boost. Check and see if there any codes set in your PCM to better pinpoint your issue.