Bullydog info that came with my chip says the CEL comes on because of the boost level. Says nothing else is affected.
However, I keep hearing that trucks (not sure if OBS or SD) will defuel when the CEL comes on due to "overboost". Is this true?
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'97 F350 PSD E4OD CC 4x4
265/75/16, BB shim=73psi, Open Element, 10K with switch on dash, IDM mod, 30K Hayden tranny cooler, 3" downpipe, 4" straight pipe, the usual gauges, Bullydog 6 position chip. Biodiesel as much as possible.
What I have heard in the past is that the OBS dont DE fuel but that FURTHER increase in fueling is limited. This is a question for Jody or Tony.
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Mine: 91 F250 Reg Cab 4x4 5spd 7.3IDI 4.10LS 145,000 miles. Banks Sidewinder 92 D60 F axle w 97 brakes and Powerlock. Lift: about 4" over stock 250. 33x12.50x16.5 Pro Comp MTs Magnaflow 12" muffler. Sees dirt everyday. Used to haul hay, wood, feed cows, check fence.
Hers: 96F250 CCSB 7.3 PSD 4x4 5spd 3.55 LS 190,000 miles. Puchased 7/03, Looked for a 5spd CCSB for a year!Dana 60 front axle, at stock F350 height (for now) Energy Poly bushings, Bilsteins, 305/70/16 Pro Comps on 16x10 Weld Outbacks, AFE Pro7,TYMAR 3x3.5x4 downpipe,TYMAR 5" straightpipe, gutted EBV, IH Non EBV pedistal,New Alliant AC Injectors,(stage 1)Cal reg kit, SBC Con O clutch, permenent clutch bushing fix, AC mod with a different twist, AMP Powersteps with custom brackets and wiring(one of 2 OBS trucks with them according to AMP) Line of Fire. Sees dirt everyday.
My Company pickup: 86 F250 6.9 C6 320,000 miles Co trucks 5 89 to 94 IDI's, plus about 50 more diesels.
Diesel Mechanic 28 yrs
Thanks for the replies. Looks like the boost foolers and defueling is a SD thing.
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'97 F350 PSD E4OD CC 4x4
265/75/16, BB shim=73psi, Open Element, 10K with switch on dash, IDM mod, 30K Hayden tranny cooler, 3" downpipe, 4" straight pipe, the usual gauges, Bullydog 6 position chip. Biodiesel as much as possible.
Thanks gixxer. I guess that is the other part of the situation. When you see a CEL there is a code that has been thrown due to the "higher than normal boost".
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'97 F350 PSD E4OD CC 4x4
265/75/16, BB shim=73psi, Open Element, 10K with switch on dash, IDM mod, 30K Hayden tranny cooler, 3" downpipe, 4" straight pipe, the usual gauges, Bullydog 6 position chip. Biodiesel as much as possible.
Well, I didn't have AutoE back then. I went to Home Depo, bought a mini reg, set for 22psi, installed it, and never seen the light again. [img]/ubbthreads/images/graemlins/shrug.gif[/img]
__________________ 95 F350 Crewcab4X4: TE Twin Turbo(BB fed by a Turbonetics TN76 from BWD), DDP BD Injectors, DIIC with custom stainless 3" piping, <span style="color: red">Terminator HPOS</span>, DI headstuds, BTS tranny, TruCool 40GVW cooler, <span style="color: blue">DP LIVE TUNED F5 with Extreme ICP!</span> , Custom fuel system, MagHytec diff cover.
01 F350 Regcab4X4: soon to be sold.
97 F350 Regcab4X4: Project(everything to make power).
WIth a smaller exhaust housing I'll definitely be over that 25psi alot so I'd like to get it stopped. I suppose I can check the codes to see if it is something else as well as get a blowoff valve. I noticed the SDs have $30 pig tails that are called "boost foolers". Don't suppose they fit the OBS trucks do they?
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'97 F350 PSD E4OD CC 4x4
265/75/16, BB shim=73psi, Open Element, 10K with switch on dash, IDM mod, 30K Hayden tranny cooler, 3" downpipe, 4" straight pipe, the usual gauges, Bullydog 6 position chip. Biodiesel as much as possible.
Used an adjustable blow off valve on mapp line. Set at 24lbs. No more light or code. My 4dollar cure.
Valve--Grainger---6D915--3.89
Its a tiny valve.
I'am shure the price has changed. I installed in 2002.
As I recall reading on here a while back the PCM does not de-fuel, however, when seeing more than 24lbs (?) boost the signal (to PCM is erratic) and the PCM does not add any more fuel. I can not remember (exactly) where, when I read this but it would have been here. At any rate I put on an adjustable relief value set at 22psi on the map line. Also hooked my boost gauge on the HOT side of the intercooler and it shows 29lbs often.....
jrc
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96 XLT F350 CC ZF-5 355's 16x8 aluminum rims 285/75R 16 Dick Cepek F-C IIs. T Wildman programs, Map regulator, DIY CCV & HX mod, TDS exhaust brake, BD gauges, downpipe 4" exhaust, custom SS resonator, LUK, SD I/C, Custom Shackle Reversal, Custom Moose Bar and Velvet rides, RS 9000x shocks, Custom Aluminum Drybox/fuel tank, Swamp's Baby Injectors, SD Hpop, DIY Oil by pass filtration, DIY electric fans, DIY E-Fuel system, Lighting by VisionX, LightForce and PIAA and other stuff. http://community.webshots.com/user/jcart44
My 97 Calif. truck will throw a turbo overboost code CEL at about 22-24 psi. After about 6-10 times the code goes permanent and the CEL stays on all the time. The truck does not defuel when this happens. I used a pressure regulator set to about 19 psi and that cured the problem. No more CELs at 32 psi. I have had the pressure setting of the pressure regulator set too low (about 13-14 psi) and that definitely does not allow full enrichment (as opposed to defueling). Before installing the regulator, the truck would hit 400 hp with a turbo overboost CEL so I am sure no defueling was taking place.
The SD map sensor has a voltage output and uses a zener diode to limit the output to 4.7 volts to prevent the CEL and subsequent defueling ( a particularly SD only phenomenon). The OBS map sensor outputs a increasing frequency so the zener diode mod will not work on the OBS trucks. You either have to limit the input pressure or use a map simulator to prevent the CEL on a OBS truck.
Thanks Dave, we can always count on you for accurate info! Does anyone know what the situation is with pre 97 and Federal trucks is? It seems like the 97 Calif trucks were advanced beyond the other OBS.
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Mine: 91 F250 Reg Cab 4x4 5spd 7.3IDI 4.10LS 145,000 miles. Banks Sidewinder 92 D60 F axle w 97 brakes and Powerlock. Lift: about 4" over stock 250. 33x12.50x16.5 Pro Comp MTs Magnaflow 12" muffler. Sees dirt everyday. Used to haul hay, wood, feed cows, check fence.
Hers: 96F250 CCSB 7.3 PSD 4x4 5spd 3.55 LS 190,000 miles. Puchased 7/03, Looked for a 5spd CCSB for a year!Dana 60 front axle, at stock F350 height (for now) Energy Poly bushings, Bilsteins, 305/70/16 Pro Comps on 16x10 Weld Outbacks, AFE Pro7,TYMAR 3x3.5x4 downpipe,TYMAR 5" straightpipe, gutted EBV, IH Non EBV pedistal,New Alliant AC Injectors,(stage 1)Cal reg kit, SBC Con O clutch, permenent clutch bushing fix, AC mod with a different twist, AMP Powersteps with custom brackets and wiring(one of 2 OBS trucks with them according to AMP) Line of Fire. Sees dirt everyday.
My Company pickup: 86 F250 6.9 C6 320,000 miles Co trucks 5 89 to 94 IDI's, plus about 50 more diesels.
Diesel Mechanic 28 yrs
Wow! That is some really good info! Thanks!
The CEL is slightly embarassing when someone who is not used to diesels is riding in the truck [img]/ubbthreads/images/graemlins/blush.gif[/img]
Especially annoying that it stays on until the truck is turned off.
Since I'll be putting a .84 housing on sooner rather than later I'd better get on this blowoff valve for the map line.
Thanks again!
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'97 F350 PSD E4OD CC 4x4
265/75/16, BB shim=73psi, Open Element, 10K with switch on dash, IDM mod, 30K Hayden tranny cooler, 3" downpipe, 4" straight pipe, the usual gauges, Bullydog 6 position chip. Biodiesel as much as possible.
Supporter/User of THE CURE E4OD/4R100 Transmission Control
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